bluuebunny/crossref_metadata_2025 huggingface dataset:
An Introduction to Dimensionless Parameters in the Study of Viscous Fluid Flows
Authors: Guerra David , Corley Kevin , Giacometti Paolo , Holland Eric , Humphreys Michael , Nicotera Michael
Published: February 2011

It has been suggested that there is a need to deepen the understanding of fluid dynamics in the introductory physics course and to offer interesting experiments to do so.1 To address this need we have developed a laboratory experiment and the supporting analysis to demonstrate the role of viscosity and the interestingly mysterious use of dimensionless parameters in fluid dynamics.2 Since viscosity indicates the frictional dependence between the layers of a flowing fluid, a thoughtful student may ask why or when viscosity can be neglected. The laboratory experiment presented here uses common fluids to provide a concrete answer to this question and an easily understandable example of the role of dimensionless parameters in fluid dynamics.
More on Faraday's and Lenz's laws - Qualitative demonstrations
Authors: Hessel Roberto
Published: February 2011

A large variety of simple setups for demonstrating Faraday's and Lenz's laws have been described in the literature.1–4 For a few semesters, we tested some of these setups, especially those suggested in Ref. 1, but recently we decided to develop our own version.
Inertia in Action
Authors: Riendeau Diane
Published: February 2011

Special thanks to Jennifer Groppe (Maret School) and Shannon Mandel (Barrington High School) for their help with this month's column.

If you use YouTube videos in your classroom, please send the link and a brief description to driendeau@dist113.org.
Binding together bonds
Authors: Rideout Ken
Published: February 2011

Many years ago when I was in high school, I asked my AP® Chemistry teacher, “Why is there a negative sign in front of the 13.6 eV in the table of electron energies? What does it mean to have negative energy?” She told me it had something to do with potential energy and not to worry about it. Well, I am still worrying about it.
Mechanistic Basis of Resistance to PCBs in Atlantic Tomcod from the Hudson River
Authors: Wirgin Isaac , Roy Nirmal K. , Loftus Matthew , Chambers R. Christopher , Franks Diana G. , Hahn Mark E.
Published: February 2011

Chronic pollution of the Hudson River, New York, results in rapid evolution of resistance to the pollutants.
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Perturbations Associated with the Central Atlantic Magmatic Province
Authors: Schaller Morgan F. , Wright James D. , Kent Dennis V.
Published: February 2011

Emplacement of the Central Atlantic Magmatic Province 200 million years ago greatly elevated atmospheric carbon dioxide concentrations.
Crystal Structure of the Dynein Motor Domain
Authors: Carter Andrew P. , Cho Carol , Jin Lan , Vale Ronald D.
Published: February 2011

The structure reveals the functional elements of the dynein motor and suggests how they change conformation during motility.
The pathogenesis of endometrial carcinomas at menopause: facts and figures
Authors: Sivridis Efthimios , Giatromanolaki Alexandra
Published: February 2011

Almost a third of the life of a woman is now postmenopausal, and during this period over 80% of endometrial carcinomas develop. This is by far the most common gynaecological malignancy in the industrialised world and, probably, the less completely understood with regard to its pathogenesis after the menopause. For while it is generally thought that these neoplasms are non-oestrogen-induced, we are, at the same time, informed that oestrogenic stimulation is continuous during menopause through increases to oestrone formation in the adipose tissue from androgens of adrenal and ovarian origin. Furthermore, the postmenopausal endometrium has been typified as atrophic, which is indeed true, but is also implied as being inactive, which in fact it is not; in most cases, the postmenopausal endometrium appears to be weakly proliferative with potential to give rise to an endometrial carcinoma. It is also assumed that postmenopausal endometrial tumours are predominantly of serous papillary and clear cell type, and, in general, they are not well-differentiated endometrioid carcinomas; in reality, no more than 15% are serous papillary and clear cell carcinomas, and no less than 55% are well-differentiated endometrioid neoplasms. The overall prognosis is presumed to be poor, yet postmenopausal patients harbouring well-differentiated endometrioid carcinomas have the same excellent prognosis as those premenopausal women having endometrioid tumours of similar grade and stage. This brief account of endometrial carcinogenesis at menopause re-evaluates these issues and, in the light of new and old evidence, proposes the separation of G1 endometrioid adenocarcinomas (low-grade tumours) from all others (high-grade tumours).
Unusual thromboembolic complication during an anterior communicating artery aneurysm coiling
Authors: Goyal Sumit , Kumar Subhash , Sharma Rohitash , Husain Shakir
Published: February 2011

Thromboembolism during aneurysm coiling is a known complication with almost all thromboembolic phenomenon occurring ipsilateral to the side of vessel catheterization and sometimes bilaterally. A case is reported in which thromboembolism occurred exclusively on the opposite side of vessel catheterization, the first case to be reported, to our knowledge.
Tobacco sales and promotion in bars, cafes and nightclubs from large cities around the world
Authors: Shahrir Shahida , Wipfli Heather , Avila-Tang Erika , Breysse Patrick N , Samet Jonathan M , Navas-Acien Ana ,   the FAMRI Bar Study Investigators
Published: February 2011

Context

Little is known about tobacco promotion activities in low and middle-income countries. Information on tobacco sales, advertisement and promotion in bars, cafes and nightclubs is needed to develop interventions to reduce smoking initiation and relapse, particularly among youths and young adults.

Objective

To evaluate cigarette sales and tobacco advertisement and promotion in bars, cafes and nightclubs using a volunteer survey approach in large cities throughout the world.

Methods

Between 2007 and 2009, we administered an interview-based survey to 231 bar/cafe/nightclub owners/managers in 24 large cities in Africa, the Americas, Asia and eastern Europe.

Results

Cigarette sales and tobacco advertisement and promotions were found in bars/cafes/nightclubs in most cities. Examples of promotions included cigarette giveaways and event sponsorship. Establishments that allowed smoking were more likely to sell cigarettes compared to smoke-free establishments (OR 8.67, 95% CI 3.25 to 23.1). Larger establishments (maximum occupancy ≥100 vs <100 customers) were more likely to have tobacco advertising (OR 4.35, 95% CI 2.04 to 9.24) and to receive promotional items from tobacco companies (OR 3.18, 95% CI 1.41 to 7.17).

Conclusions

Cigarette sales and tobacco promotions were common in bars, cafes and nightclubs in the majority of cities. Socialising and hospitality venues must be covered by legislation banning tobacco sales and promotions to limit exposure among populations at high risk of tobacco initiation and relapse from quitting.
RECENT RESULTS ON MESON SPECTROSCOPY FROM BELLE AND BABAR
Authors: UEHARA SADAHARU
Published: February 2011

Recent experimental studies of meson spectroscopy at the B -factories are reviewed. This report covers updates of studies for exotic candidates of both charmonium-like and bottomonium-like particles as well as searches and measurements of other new or known states including conventional heavy quarkonia.
CHARMONIUM IN CHINA: BEPCII/BESIII
Authors:   FOR THE BES COLLABORATION, HARRIS FREDERICK A.
Published: February 2011

Results based on 106 M ψ′ events and about 226 M J/ψ events acquired with the BESIII detector at BEPCII are reported, including a confirmation of the BESII [Formula: see text] threshold enhancement in [Formula: see text], branching ratios for χcJ → π0π0 and ηη, and first measurements of the branching ratios for ψ′ → π0hc and hc → γηc, as well as measurements of the mass and width of the hc.
RECENT PROGRESS IN CHARMONIUM PHYSICS: ROLE OF HEAVY MESON LOOPS
Authors: HANHART CHRISTOPH
Published: February 2011

In recent years a large number of new states in the charm sector was discovered above the first inelastic threshold that not at all match to the predictions of the quark model, which on the other hand was extremely successful below that threshold. Since most of those states are located close to a two–hadron threshold, many authors proposed a molecular nature for them. In this talk we will collect the evidences and discuss how the picture can be tested further. In addition, if hadron loops induce non-perturbative effects above the inelastic threshold, one should also expect them to have some impact on the properties of standard charmonia. In the last part of this write-up an effective field theory is introduced that allows one to investigate this issue systematically.
HEAVY-FLAVOR MESON PRODUCTION AT RHIC
Authors: MISCHKE ANDRÉ
Published: February 2011

Collisions of heavy atomic nuclei at very high beam energies allow to create and study hot QCD matter under laboratory-controlled conditions. Measurements at the SPS and RHIC facilities have yielded compelling evidence for the formation of this novel state of matter, the so-called Quark-Gluon Plasma (QGP). Due to their large mass, heavy quarks (charm and bottom) are believed to be predominantly produced in the initial state of the collision so that they probe the entire lifetime of the QGP. Thus, the investigation of heavy-flavor meson production in nucleus-nucleus collisions provides profound insight into the QGP properties. In this paper we review recent results from the RHIC facility on heavy-flavor meson production and their interaction with the QCD matter on the partonic level.
MESON PHYSICS AT HERA
Authors:   FOR THE H1 AND ZEUS COLLABORATIONS, FIGIEL JAN
Published: February 2011

The recent, selected results on meson production at HERA electron-proton collider from the H1 and ZEUS experiments are presented and interpreted within the framework of quantum chromodynamics.
IMPACT OF DYNAMICAL CHIRAL SYMMETRY BREAKING ON MESON STRUCTURE AND INTERACTIONS
Authors: ROBERTS H. L. L. , CHANG L. , ROBERTS C. D.
Published: February 2011

We provide a glimpse of recent progress in meson physics made via QCD's Dyson-Schwinger equations with: a perspective on confinement and dynamical chiral symmetry breaking (DCSB); a précis on the physics of in-hadron condensates; results for the masses of the π, σ, ρ, a1 mesons and their first-radial excitations; and an illustration of the impact of DCSB on the pion form factor.
DILEPTON PRODUCTION STUDIED WITH THE HADES SPECTROMETER
Authors:   HADES Collaboration, RUSTAMOV A. , AGAKISHIEV G. , BALANDA A. , BELVER D. , BELYAEV A. , BLANCO A. , BÖHMER M. , BOYARD J. L. , CABANELAS P. , CASTRO E. , CHERNENKO S. , DÍAZ J. , DYBCZAK A. , EPPLE E. , FABBIETTI L. , FATEEV O. , FINOCCHIARO P. , FONTE P. , FRIESE J. , FRÖHLICH I. , GALATYUK T. , GARZÓN J. A. , GIL A. , GOLUBEVA M. , GONZÁLEZ-DÍAZ D. , GUBER F. , GUMBERIDZE M. , HENNINO T. , HOLZMANN R. , HUCK P. , IERUSALIMOV A. , IORI I. , IVASHKIN A. , JURKOVIC M. , KÄMPFER B. , KARAVICHEVA T. , KOENIG I. , KOENIG W. , KOLB B. W. , KOPP A. , KORCYL G. , KORNAKOV G. K. , KOTTE R. , KOZUCH A. , KRÁSA A. , KRIZEK F. , KRÜCKEN R. , KUC H. , KÜHN W. , KUGLER A. , KUREPIN A. , KURILKIN A. , KURILKIN P. , KÄHLITZ P. , LADYGIN V. , LAMAS-VALVERDE J. , LANG S. , LAPIDUS K. , LIU T. , LOPES L. , LORENZ M. , MAIER L. , MANGIAROTTI A. , MARKERT J. , METAG V. , MICHALSKA B. , MICHEL J. , MÜNTZ C. , NAUMANN L. , PACHMAYER Y. C. , PALKA M. , PARPOTTAS Y. , PECHENOV V. , PECHENOVA O. , PIETRASZKO J. , PRZYGODA W. , RAMSTEIN B. , RESHETIN A. , ROSKOSS J. , SADOVSKY A. , SALABURA P. , SCHMAH A. , SIEBENSON J. , SOBOLEV YU. G. , SPATARO S. , STRÖBELE H. , STROTH J. , STURM C. , TARANTOLA A. , TEILAB K. , TLUSTY P. , TRAXLER M. , TREBACZ R. , TSERTOS H. , VASILIEV T. , WAGNER V. , WEBER M. , WÜSTENFELD J. , YUREVICH S. , ZANEVSKY Y.
Published: February 2011

With the HADES spectrometer at GSI we have studied dilepton production in various collision systems from elementary N + N , over p + A , up to the medium-heavy Ar + KCl system. We have confirmed the puzzling results of the former DLS collaboration at the Bevalac. While we have traced the origin of the excess pair yield in C + C collisions to elementary p + p and n + p processes, we find a significant contribution from the dense phase of the collision in larger Ar + KCl system. From recently obtained e + e - pair spectra in p + p and p + Nb interactions at 3.5 GeV kinetic beam energy the inclusive production cross sections for neutral pions, η , ω and ρ mesons are extracted for the first time at this beam energy. Furthermore, the production mechanisms of the vector mesons, which are not known at these energies, are investigated. The direct comparison of p + p and p + Nb data allows us to investigate in-medium mass modifications of vector mesons at nuclear ground state density.

On the other hand, exclusive production of ω and η mesons in p + p reactions at 3.5 GeV were studied via their π+π-π0 decay channel. Production cross sections and angular distributions for both states were determined.
ELENA: AN UPGRADE TO THE ANTI-PROTON DECELERATOR AT CERN
Authors: OELERT WALTER
Published: February 2011

CERN has a long tradition of pursuing fundamental physics on a variety of energy scales. For anti-protons CERN famously produced the high-energy SPS beam but also the world's only and unique sources of low-energy anti-protons – first the Low Energy Anti-proton Ring (LEAR) and thereafter the Anti-proton Decelerator (AD).

The scientific demand for low-energy anti-protons at the AD continues to grow. More rapid progress and much higher measurement precision might be possible by upgrading the AD to increase and optimize the number of cold anti-protons that can be trapped and accumulated. To achieve this the construction of an Extra Low ENergy Antiproton (ELENA) ring is proposed which involves both the addition of a small storage ring and electrostatic beam lines to the experiments. The design parameters have been carefully studied and agreed upon over several years. At least during the next decade there is no alternative low-energy anti-proton source for physics to be done now.
FIRST RESULTS OF THE CMS EXPERIMENT ON QCD PHYSICS
Authors:   FOR THE CMS COLLABORATION, GALANTI MARIO
Published: February 2011

Results presented here constitute the first achievements of the rich QCD physics program of the CMS experiment at LHC. Using data from proton-proton collisions at center-of-mass energies of 0.9, 2.36 and 7 TeV, measurements of charged particle yields, Bose-Einstein correlations and underlying event features have been produced. These are among the first results concerning the properties and interactions of charged hadrons at the new energy frontier accessible at LHC.
RECENT RESULTS AND FUTURE PLANS FOR AMADEUS
Authors:   FOR THE AMADEUS COLLABORATION, ZMESKAL JOHANN
Published: February 2011

The AMADEUS experiment will give a first conclusive answer to the question on the existence of the deeply bound kaonic states, which is discussed quite controversially in the hadron physics community today. Using the KLOE detector system together with the AMADEUS apparatus an exclusive measurement will be performed that means a complete determination of all formation and decay channels of kaonic nuclear states is possible in the [Formula: see text] reaction using 3 He and 4 He targets. The upgraded high luminosity DAɸNE e+e- collider at LNF is essential for successful measurements. Using missing mass and invariant mass spectroscopy a conclusive observation of these exotic objects should be reachable, and their properties, such as binding energies, total and partial widths, size and density could be determined. Thus, will open a new field in the spectroscopy of di- and tri-baryon systems with strangeness ( S = -1).
THE FINUDA EXPERIMENT ON DAΦNE
Authors: LUCHERINI VINCENZO
Published: February 2011

FINUDA (FIsica NUcleare a DAɸne) is a spectrometer built to study the interactions of stopped K - on nuclei, with emphasis on spectroscopy and decay of Λ-hypernuclei. Due to the nice performances of the apparatus and its ability to reconstruct secondary vertices, it proved suited to study also final states with several particles (including neutron), hence greatly enlarging the physical topics that could be addressed.
X-RAY SPECTROSCOPY OF KAONIC ATOMS AT DAΦNE
Authors:   FOR THE SIDDHARTA COLLABORATION, VIDAL A. ROMERO , BAZZI M. , BEER G. , BOMBELLI L. , BRAGADIREANU A. M. , CARGNELLI M. , CORRADI G. , CURCEANU (PETRASCU) C. , D'UFFIZI A. , FIORINI C. , FRIZZI T. , GHIO F. , GIROLAMI B. , GUARALDO C. , HAYANO R. S. , ILIESCU M. , ISHIWATARI T. , IWASAKI M. , KIENLE P. , SANDRI P. LEVI , LONGONI A. , LUCHERINI V. , MARTON J. , OKADA S. , PIETREANU D. , PONTA T. , RIZZO A. , SCORDO A. , SHI H. , SIRGHI D. L. , SIRGHI F. , TATSUNO H. , TUDORACHE A. , TUDORACHE V. , DOCE O. VÁZQUEZ , WIDMANN E. , ZMESKAL J.
Published: February 2011

The SIDDHARTA experiment aims a precise measurement of K -series kaonic hydrogen x-rays and the first-ever measurement of the kaonic deuterium x-rays to determine the strong-interaction energy-level shifts and widths of the lowest lying atomic states. These measurements offer a unique possibility to precisely determine the isospin-dependent kaon-nucleon ( KN ) scattering lengths [1] which are directly connected with the physics of the KN interaction. Kaonic Helium transitions to the 2p level ( L -lines) were as well measured. The experiment has been performed at the DAΦNE e+e- collider which produces the Φ-resonance. The resulting low energy negative charged kaons, coming from the Φ decay, are well suited to be stopped efficiently in a high density gas target for producing such kind of atoms. As x-ray detectors, we employed 144 Silicon Drift Detectors developed especially for this experiment, having good energy resolution of 140 eV FWHM at 6keV and time resolution of sub-micro seconds. The data taking was completed in November 2009. In this paper, an overview of this experiment and preliminary results are presented, together with future plans.
HADRON PHYSICS WITH MESON PHOTOPRODUCTION AT LEPS/SPRING-8
Authors:   FOR THE LEPS COLLABORATION, HOTTA TOMOAKI
Published: February 2011

At the laser electron photon facility at SPring-8 (LEPS), meson photoproduction reactions have been studied by using highly polarized photon beams produced by the Compton backscattering of the laser off the high energy electrons. The recent activities at the LEPS experiment are overviewed. From the recent results, the meson photo-production reactions at the backward angles, and the photoproduction of Λ(1405) are discussed. In order to extend our study to wider kinematical range, construction of the new beamline and the large acceptance detector has been started.
RECENT RESULTS FROM THE WASA-at-COSY EXPERIMENT: LIGHT MESON DECAYS
Authors:   FOR THE WASA-AT-COSY COLLABORATION, KUPSC ANDRZEJ
Published: February 2011

Studies of light meson decays are the key experiments for the WASA detector at COSY-Jülich. One of the world largest data samples of the η meson decays have been recently collected in the pd →3 He η and in the pp → ppη reactions. The status of the analysis of various decay channels and the further plans for the light meson decay program are presented.
SPECTROSCOPY OF BARYON RESONANCES AT ELSA
Authors: CREDE VOLKER
Published: February 2011

Current and upcoming experiments at the ELectron Stretcher Accelerator (ELSA) facility will determine polarization (or spin) observables for photoproduction processes involving baryon resonances. Differences between the predictions for these observables can be large, and so conversely they provide strong constraints in the analyses that aim at studying the properties of known resonances and at searching for hitherto unobserved states. The current effort with the Crystal Barrel/TAPS detector at ELSA is to utilize highly-polarized frozen-spin (butanol) and deuterium targets in combination with polarized photon beams. I will discuss recent spectroscopy results and present a brief status of the polarization program.
DOUBLE PION PRODUCTION IN NN AND $\bar NN$ COLLISIONS
Authors: CAO XU , ZOU BING-SONG , XU HU-SHAN
Published: February 2011

With an effective Lagrangian approach, we give a full analysis on the NN → NNππ and [Formula: see text] reactions by exploring the roles of various resonances with mass up to 1.72 GeV. We find large contributions from Δ, N*(1440), Δ(1600) and Δ(1620) resonances. Our calculations also indicate sizeable contributions from nucleon poles for the energies close to the threshold. A good description to the existing data of different isospin channels of NN → NNππ and [Formula: see text] for beam energies up to 2.2 GeV is reached. Our results provide important implications to the ABC effect and guildlines to the future experimental projects at COSY, HADES and HIRFL-CSR. We point out that the [Formula: see text] at FAIR could be an essential place for studying the properties of baryon resonances and the data with baryon and anti-baryon in final states are worth analyzing.
THE ALICE EXPERIMENT AT CERN LHC: STATUS AND FIRST RESULTS
Authors:   FOR THE ALICE COLLABORATION, VERCELLIN ERMANNO
Published: February 2011

The ALICE experiment is aimed at studying the properties of the hot and dense matter produced in heavy-ion collisions at LHC energies. In the first years of LHC operation the ALICE physics program will be focused on Pb - Pb and p - p collisions. The latter, on top of their intrinsic interest, will provide the necessary baseline for heavy-ion data. After its installation and a long commissioning with cosmic rays, in late fall 2009 ALICE participated (very successfully) in the first LHC run, by collecting data in p - p collisions at c.m. energy 900 GeV. After a short stop during winter, LHC operations have been resumed; the machine is now able to accelerate proton beams up to 3.5 TeV and ALICE has undertaken the data taking campaign at 7 TeV c.m. energy. After an overview of the ALICE physics goals and a short description of the detector layout, the ALICE performance in p - p collisions will be presented. The main physics results achieved so far will be highlighted as well as the main aspects of the ongoing data analysis.
STRONG INTERACTION PHYSICS WITH PANDA
Authors:   FOR THE PANDA COLLABORATION, GILLITZER ALBRECHT
Published: February 2011

The physics program of the PANDA experiment at FAIR, studying antiproton-proton and antiproton-nucleus collisions, is described. A brief overview of the full program is given, but the emphasis is laid on spectroscopy of hidden and open charm mesons, as well as of multi-strange baryons. In addition the investigation of the J/ψ-nucleon interaction using transparency measurements in antiproton-nucleus collisions is discussed.
PROSPECTS FOR KLOE-2
Authors:   FOR THE KLOE-2 COLLABORATION: F. Archilli, D. Babusci, D. Badoni, G. Bencivenni, C. Bini, C. Bloise, V. Bocci, F. Bossi, P. Branchini, A. Budano, S. A. Bulychjev, P. Campana, G. Capon, F. Ceradini, P. Ciambrone, E. Czerwiński, E. Dané, E. De Lucia, G. De Robertis, A. De Santis, G. De Zorzi, A. Di Domenico, C. Di Donato, B. Di Micco, D. Domenici, O. Erriquez, G. Felici, S. Fiore, P. Franzini, P. Gauzzi, S. Giovannella, F. Gonnella, E. Graziani, F. Happacher, B. Höistad, E. Iarocci, M. Jacewicz, T. Johansson, MOSKAL PAWEŁ
Published: February 2011

The basic motivation of the KLOE-2 experiment is the test of fundamental symmetries and Quantum Mechanics coherence of the neutral kaon system, and the search for phenomena beyond the Standard Model in the hadronic and leptonic decays of ground-state mesons. Perspectives for experimentation by means of the KLOE-2 apparatus equipped with the inner tracker, new scintillation calorimeters, and the γγ taggers at the DAΦNE electron-positron collider upgraded in luminosity and energy are presented.
STUDY OF THE K+K- INTERACTION AT COSY-11
Authors: SILARSKI MICHAŁ
Published: February 2011

In this article we present studies of the near threshold pp → ppK+K- reaction in view of the K+K- final state interaction. The investigations include analysis of both the low-energy K+K- invariant mass distributions measured by COSY-11 collaboration at excess energies of Q = 10 MeV and Q = 28 MeV and the near threshold excitation function for the pp → ppK+K- reaction. As a result of these studies we have estimated the K+K- scattering length more precise compared to the previous analysis based only on the analysis of the differential cross sections.
ANALYSIS OF B± → K+K-K± DECAYS
Authors: LEŚNIAK L. , FURMAN A. , KAMIŃSKI R. , ŻENCZYKOWSKI P.
Published: February 2011

Rare B± decays to three charged kaons are analysed. The weak decay amplitudes are derived in the QCD factorization approach. The strong final state interactions between pairs of kaons are described using the kaon scalar and vector form factors. The scalar form factors at low K+K- effective mass distributions are constrained by chiral symmetry and are related to the coupled channel meson-meson amplitudes describing all the transitions between three channels consisting of two kaons, two pions and four pions. The vector form factors are fitted to the data on e+e- collisions. The model results are compared with the Belle and BaBar data.
INVESTIGATION OF B-MESON DECAYS INTO BARYONS WITH THE BABAR DETECTOR
Authors:   FOR THE BABAR COLLABORATION, LEDDIG TORSTEN
Published: February 2011

We report on investigations of B-meson decays into baryons with the BABAR detector. The comparison of different decay channels reveals that higher multiplicities are preferred for these decays. Furthermore, an enhancement in the invariant baryon-antibaryon mass distribution can be observed in several baryonic decay modes. In addition, the study of baryon resonances seen in baryonic B-meson decays is presented.
RESULTS ON K- ABSORPTION ON FEW-NUCLEON SYSTEMS WITH FINUDA AT LNF
Authors:   ON BEHALF OF THE FINUDA COLLABORATION, PIANO STEFANO
Published: February 2011

Data from the [Formula: see text] absorption reaction on light nuclei, 6,7 Li , 9 Be and 12 C , have recently been collected by FINUDA at DAΦNE (LNF). The studies rely on Λp(d,t) correlations. Regardless of A, the Λp(d,t) pairs are found to be preferentially emitted in opposite directions. Moreover the analysis are based on the Λp(d, t) invariant mass and missing mass distributions, which allow the structure of bound [K-NN(NNN,NNNN)] systems in nuclei to be examined.
THE SEARCH FOR DEEPLY BOUND KAONIC NUCLEAR STATES AT J-PARC
Authors:   THE J-PARC E15 COLLABORATION, HIRAIWA T. , AJIMURA S. , BEER G. , BHANG H. , BRAGADIREANU M. , BUEHLER P. , BUSSO L. , CARGNELLI M. , CHOI S. , CURCEANU C. , ENOMOTO S. , FASO D. , FUJIOKA H. , FUJIWARA Y. , FUKUDA T. , GUARALDO C. , HASHIMOTO T. , HAYANO R. S. , IIO M. , ILIESCU M. , INOUE K. , ISHIKAWA T. , ISHIMOTO S. , ISHIWATARI T. , ITAHASHI K. , IWAI M. , IWASAKI M. , KIENLE P. , KOU H. , MARTON J. , MATSUDA Y. , MIZOI Y. , MORRA O. , NAGAE T. , NOUMI H. , OHNISHI H. , OKADA S. , OUTA H. , PIETREANU D. , LENER M. POLI , VIDAL A. ROMERO , SADA Y. , SAKAGUCHI A. , SAKUMA F. , SATO M. , SEKIMOTO M. , SHI H. , SIRGHI D. , SIRGHI F. , SUZUKI K. , SUZUKI S. , SUZUKI T. , TATSUNO H. , TOKUDA M. , TOMONO D. , TOYODA A. , TSUKADA K. , DOCE O. VAZQUEZ , WIDMANN E. , YAMAZAKI T. , YIM H. , ZMESKAL J.
Published: February 2011

The J-PARC E15 experiment aims to search for the lightest kaonic nuclear states, namely K-pp, using in-flight (K-, n) reaction on 3 He . In this experiment, the missing mass in the (K-, n) reaction and the invariant mass of the decay such as K-pp → Λp → pπ-p will be measured simultaneously. In this article, the experimental feature and the present status are presented.
EXPERIMENTAL SEARCH FOR THE KAONIC NUCLEAR STATE K-pp
Authors: SUZUKI KEN
Published: February 2011

We search for the most basic kaonic nuclear state, K-pp, by studying an exclusive p + p → p + Λ + K+ process at Tp = 3.1 GeV using FOPI apparatus at GSI, Darmstadt, Germany. A possible signature of the K-pp is searched as a p + p → K-pp + K+ → p + Λ + K+ reaction in the event sample of pΛK+ three body process. A missing-mass ΔM(K+) spectrum, a Λp invariant-mass M(Λp) spectrum and a mono energetic kaon will characterize such a two body process. The reaction channel is basically the same as the one which T. Yamazaki et al. very recently reported a possible hint of such state with M = 2267 MeV /c2 and Γ = 118 MeV from a re-analysis of the DISTO experiment data. The DISTO data was taken at Tp = 2.85 GeV . The beam energy of the FOPI experiment is chosen to optimize the signal to background ratio and also to see the background shape separately. FOPI data taking took place in August-September 2009 and analysis is currently undergoing.
STRANGE BARYONIC MATTER AND KAON CONDENSATION
Authors: GAZDA D. , FRIEDMAN E. , GAL A. , MAREŠ J.
Published: February 2011

In this contribution we address the question whether kaon condensation could occur in strongly interacting self-bound strange hadronic matter. In our comprehensive dynamical relativistic mean-field (RMF) calculations of nuclear and hypernuclear systems containing several antikaons we found saturation of [Formula: see text] separation energy as well as the associated nuclear and [Formula: see text] density distributions upon increasing the number of [Formula: see text] mesons. The saturation pattern was found to be a universal feature of these multi-strangeness configurations. Since in all cases the [Formula: see text] separation energy does not exceed 200 MeV, we conclude that [Formula: see text] mesons do not provide the physical "strangeness" degrees of freedom for self-bound strange hadronic matter.
ON THE NATURE OF THE X(3872)
Authors: VALCARCE ALFREDO , VIJANDE JAVIER
Published: February 2011

We present recent studies of charmonium multiquark states. We use different interacting models and numerical methods to study deeply bound four-quark states and meson-meson molecules. No deeply bound four-quark states are found in our analysis. A nice description of the X (3872) is obtained as a [Formula: see text] coupled channel state.
STUDIES OF OPEN CHARM AND CHARMONIUM PRODUCTION AT LHCb
Authors:   ON BEHALF OF THE LHCb COLLABORATION, MANCA GIULIA
Published: February 2011

We present recent results from charmonium and open charm production at the LHCb experiment at CERN, Geneva. We concentrate on studies for the measurement of the cross section pp → J/ψX in its decay channel with two muons, showing the agreement of the simulation with the data in few key distributions. We also show the reconstructed modes of D0 → K-π+, D0 → K-π+π0, [Formula: see text] and [Formula: see text] and their prospects.
RECENT CHARMONIUM RESULTS AT BES-III
Authors:   ON BEHALF OF BES COLLABORATION, ZHU KAI
Published: February 2011

Recent results on Charmonium spectrum and decays at Beijing Spectrometers III (BES-III) experiment will be presented. This report includes the following topics: 1, first measurement of the transition rates of ψ′ → π0hcand hc→ γηc, and improved measurement of the mass and width of the hc; 2, observations of χcJ→ VV, with VV being ɸɸ, ωω and ωɸ, χcJ→ ωɸ as well as χc1→ ɸɸ and ωω are first observations; 3, improved measurement of the branching fractions of χcJdecay into neutral pseudo-scalar pairs, including χc0,2→ π0π0and χc0,2→ηη. All these measurements are based on the world largest ψ′ data sample collected with the BES-III detector at the Beijing Electron Positron Collider II (BEPC-II).
PRECISION CALCULATION OF THE π-d SCATTERING LENGTH
Authors: HOFERICHTER M. , BARU V. , HANHART C. , KUBIS B. , NOGGA A. , PHILLIPS D. R.
Published: February 2011

We present a calculation of the π-d scattering length in the framework of chiral perturbation theory (ChPT) with focus on virtual-photon effects. Using data on pionic deuterium and pionic hydrogen atoms, we extract the isoscalar and isovector pion–nucleon scattering lengths [Formula: see text] and [Formula: see text], as well as—via the Goldberger–Miyazawa–Oehme sum rule—the charged-pion–nucleon coupling constant [Formula: see text]
CHARGE SYMMETRY BREAKING IN pn → dπ0
Authors: FILIN ARSENIY A.
Published: February 2011

We study charge symmetry breaking (CSB) in the reaction pn → dπ0. CSB manifests itself in a forward-backward asymmetry of the differential cross section measured recently at TRIUMF. A complete calculation of CSB effects at leading order in chiral perturbation theory is performed. A new leading-order operator is included. This allows us to extract the strong contribution to the neutron-proton mass difference from the analysis. The value obtained is consistent with the result of Gasser and Leutwyler based on the Cottingham sum rule and with an extraction from lattice QCD.
CHARGE SYMMETRY BREAKING IN dd → 4He π0 WITH WASA-at-COSY
Authors:   FOR THE WASA-at-COSY COLLABORATION, HEJNY VOLKER
Published: February 2011

Charge symmetry breaking effects can be used as an experimental tool to study quark mass effects. Using recent high precision data from TRIUMF and IUCF an international theory collaboration is working on a consistent description within the framework of chiral pertubation theory. The WASA-at-COSY collaboration has started an experimental program extending the studies on the reaction dd → 4 He π0 towards higher excess energies in order to provide necessary information on the contribution of p-waves. First preliminary results on the total cross section at Q = 60 MeV are presented.
STATUS AND PLANS OF EXPERIMENT E17 AT J-PARC
Authors: WUENSCHEK B. K. , BHANG H. , CARGNELLI M. , CHOI S. , CURCEANU C. , DOCE O. VAZQUEZ , ENOMOTO S. , FUJIOKA H. , FUJIWARA Y. , GUARALDO C. , HASHIMOTO T. , HAYANO R. S. , HIRAIWA T. , IIO M. , ISHIMOTO S. , ISHIWATARI T. , ITAHASHI K. , IWASAKI M. , KOU H. , KIENLE P. , MARTON J. , MATSUDA Y. , NOUMI H. , OHNISHI H. , OKADA S. , OUTA H. , SAKUMA F. , SATO M. , SEKIMOTO M. , SHI H. , SIRGHI D. , SIRGHI F. , SUZUKI T. , TANIDA K. , TATSUNO H. , TOKUDA M. , TOMONO D. , TOYODA A. , TSUKADA K. , VIDAL A. ROMERO , WIDMANN E. , YAMAZAKI T. , ZMESKAL J.
Published: February 2011

X-ray spectroscopy is an advantageous tool for investigation of the shift and width of the energy levels in kaonic atoms, evoked due to strong interaction between nucleus and kaon. In order to study the 2p level shift in kaonic 3 He , the X-ray transition 3 p →2 d in liquid kaonic 3 He will be measured with a precision of <2 eV in the E17 experiment at J-PARC. To reach this desired precision, a well designed setup, in-situ calibration and state-of-the-art semiconductor detectors will be used. The idea and the preparation status of the whole setup will be reported in this article.
MEASUREMENT OF THE η → π+π-π0 DECAY WITH WASA-at-COSY DETECTOR
Authors:   FOR THE WASA-at-COSY COLLABORATION, ADLARSON PATRIK , ZIELIŃSKI MARCIN
Published: February 2011

One of the objectives of the physics programme of the WASA-at-COSY facility is to study the isospin violating η hadronic decays into π+π-π0 systems driven by the term of QCD Lagrangian which depends on the d and u quark mass difference. These studies can be made in terms of the Dalitz plot parameters describing the density population which is proportional to the square of the amplitude |A(x, y)|2. This contribution describes the current status of the analysis of the η → π+π-π0 decay in the pd →3 Heη and as well in the pp → ppη reaction with WASA-at-COSY.
SPIN-DEPENDENT STRUCTURE FUNCTION OF 3He and 3H
Authors: ARBABIFAR F. , KHORRAMIAN ALI N. , MONFARED S. TAHERI , TEHRANI S. ATASHBAR
Published: February 2011

We present the results of our QCD analysis for quark distributions and structure functions for polarized deep inelastic scattering of leptons on nucleons and nuclei using the Jacobi polynomials up to NLO approximation. Finally by having proton and also neutron structure functions, we have enough motivation to extract 3 He and 3 H polarized structure functions.
WHAT IS THE NATURE OF THE ABC EFFECT?
Authors:   FOR THE WASA-AT-COSY COLLABORATION, BASHKANOV M. , CLEMENT H.
Published: February 2011

The ABC effect — an intriguing low-mass enhancement in the ππ invariant mass spectrum — is known from inclusive measurements of two-pion production in nuclear fusion reactions. Exclusive measurements have been carried out at CELSIUS/WASA and WASA-at-COSY for the fusion reactions leading to d, 3 He and 4 He . They all reveal this effect to be of isoscalar nature and associated with a narrow Lorentzian-shaped structure in the total cross section. The latter could point to the formation of an isoscalar resonance, which couples to the pn channel as well as to an intermediate ΔΔ state.
SEARCH FOR EXOTIC EFFECTS IN η MESON LEPTONIC DECAYS
Authors:   FOR THE WASA-at-COSY COLLABORATION, BERŁOWSKI MARCIN
Published: February 2011

The search for the decay η → e+e- was carried out using the WASA detector at the COSY storage ring. Data were taken during a two week experimental run in Sept-Nov 2008 in which about 107 η mesons were collected from the reaction of pp → ppη at energy of 1.4 GeV. Background studies were performed for several different reactions. The performance of the WASA detector for the measurement of electron-positron pairs based on the single Dalitz decay of the η meson was studied. We also identified a statistically significant data sample of other more frequent leptonic decays.
CHARM PHYSICS PERFORMANCE STUDIES FOR ${\rm {\bar PANDA}}$
Authors:   FOR THE PANDA COLLABORATION, BIEGUN ALEKSANDRA
Published: February 2011

The study of the charmonium [Formula: see text] system is a powerful tool to understand the strong interaction. In [Formula: see text] annihilations studied with [Formula: see text], the mass and width of the charmonium state, such as h c, will be measured with an excellent accuracy, determined by the very precise knowledge of the [Formula: see text] beam resolution [Formula: see text] and not limited by the resolution of the detector. The analysis of h c demonstrates the feasibility to accurately determine a specific final state in the spectrum of charmed mesons. The preliminary background analysis of the [Formula: see text] decay competing with a signal channel [Formula: see text] is under control. A comparison of three decay modes of charmonium h c via the electromagnetic transition is presented.
RESONANCES IN THE ISOVECTOR P WAVE OF ππ SCATTERING
Authors: BYDŽOVSKÝ P. , SUROVTSEV YU. S. , KAMIŃSKI R. , NAGY M.
Published: February 2011

Parameters of ρ-like resonances are obtained in the multichannel analysis of the ππ-scattering data below 1.9 GeV and a possible classification of the resonance states is discussed. In the 3-channel analysis, we confirmed the existence of the ρ(1250) meson and showed that the simultaneous existence of the ρ(1450) and ρ(1250) mesons does not contradict the data. The analysis indicates an importance of presence of some effective channel with the threshold at 1512 MeV, which might be interpreted as the ρσ channel.
RAPIDITY SPECTRA FOR NET PROTON PRODUCTION AT LHC
Authors: CZERSKI PIOTR
Published: February 2011

Net proton rapidity distributions are calculated, reproduce very well data obtained at AGS, SPS, RHIC and predict results for the LHC experiment.1 Presence of non-ideal plasma effects due to strongly coupled plasma in the early stage of relativistic heavy-ion collisions is investigated in the framework of non-conventional statistical mechanics.
STUDIES OF PROPERTIES OF THE η′ MESON AT THE COSY–11 FACILITY
Authors: CZERWIŃSKI E. , KLAJA J. , KLAJA P. , MOSKAL P.
Published: February 2011

We shortly discuss results on the isospin dependence of the η′ production cross section in nucleon-nucleon collisions, results of comparative analysis of the invariant mass distributions for the pp → ppη′ and pp → ppη reactions, and we present the value of the total width of the η′ meson as derived directly from the mass distribution measured with the mass resolution of 0.3 MeV/c2.
STUDY OF THE η → γe+e- DECAY WITH THE WASA-at-COSY
Authors:   FOR THE WASA-at-COSY COLLABORATION, HODANA MAŁGORZATA
Published: February 2011

In October 2008, the WASA-at-COSY collected more than 107 events for the pd → 3 He η reaction. The aim is the determination of the invariant mass of the lepton pairs created in the Dalitz decay η → γe+e-. The e+e- invariant mass spectrum is directly related to the distribution of the four-momentum squared of the virtual photon from the η → γγ* process and hence it allows for the study of the transition form factor which in turn reflects the structure of the decaying meson.
STUDIES OF MESON PRODUCTION AND DECAYS IN pd → 3He X WITH WASA-at-COSY
Authors:   FOR THE WASA-at-COSY COLLABORATION, JANY ANNA
Published: February 2011

Studies of meson production in the pd → 3He X reaction, where X = η, η′ and ω, and their decays are investigated with the WASA-at-COSY facility. The angular distribution of the η in the center of mass of the 3He-η system, have been measured at an excess energy of Q = 61 MeV over the full angular range. The anisotropy expected at the relatively large Q is observed.
LEADING MODES OF 3π0 PRODUCTION IN PROTON-PROTON COLLISIONS AT INCIDENT PROTON MOMENTUM 3.35 GeV/c
Authors:   FOR THE WASA-at-COSY COLLABORATION, JANY BENEDYKT R.
Published: February 2011

For the first time pp → pp3π0 has been measured at an incident proton momentum of Pb = 3.35 GeV / c . The total cross section has been determined. The reaction mechanism is studied by a Dalitz plot analyses, which indicate that the leading production and decay mechanism is closely related to the simultaneous excitation of Δ(1232) and N*(1440) baryon resonances.
PION PRODUCTION IN np COLLISIONS AT 1.25 GeV WITH HADES
Authors:   FOR THE HADES COLLABORATION: for collaboration list see contribution of A. Rustamov to these proceedings., KURILKIN ALEKSEY
Published: February 2011

Preliminary results on charged pion production in np collisions at an incident beam energy of 1.25 GeV obtained with HADES are presented. The np reactions were studied in dp collisions at 1.25 GeV/u using a Forward Wall hodoscope, aimed at registering spectator protons. The separation of np → ppπ-, np → npπ+π- and np → dπ+π- channels is demonstrated.
DEUTERON-PROTON ELASTIC SCATTERING AT 1.25 GeV/u
Authors:   FOR THE HADES COLLABORATION: For collaboration list see contribution of A. Rustamov to these proceedings., KURILKIN PAVEL K.
Published: February 2011

Preliminary results on the differential cross section in dp elastic scattering has been obtained at 1.25 GeV/u with HADES within a large angular range in the center of mass system. The obtained data correspond to large transverse momenta, where a sensitivity to the 2 N and 3 N short range correlations is expected.
BUILDING HEAVY-PARTICLE LAGRANGIANS USING FOLDY-WOUTHUYSEN REPRESENTATION
Authors: LENSKY VADIM , LONG BINGWEI
Published: February 2011

We use the Foldy-Wouthuysen representation to construct Lorentz-invariant interactions of heavy fields, building the interactions starting from non-relativistic heavy particle fields. We show that the couplings obtained feature a straightforward 1/m, where m is the mass of the heavy particle, expansion, which ensures Lorentz invariance order by order in effective field theories. We illustrate possible applications on the examples of pion-nucleon and pion-nucleon-delta couplings in chiral effective field theory. For instance, we show that one of the terms usually considered to be a part of chiral index-1 πNΔ vertex is redundant. We discuss the implications of this fact.
EXCLUSIVE D+D- PAIR PRODUCTION IN THE AA → AAD+D- REACTION
Authors: ŁUSZCZAK MARTA , SZCZUREK ANTONI
Published: February 2011

The cross sections for exclusive D+D- meson pair production in nucleus - nucleus collisions are calculated and differential distributions are shown. Realistic (Fourier transform of the charge density) charge form factors of nuclei are used. Absorption effects are included. Predictions for the STAR and PHENIX collaboration measurements at RHIC are presented.
STUDY OF HELICITY AMPLITUDES IN HARD EXCLUSIVE ELECTROPRODUCTION OF A ρ0-MESON ON PROTON AND DEUTERON AT HERMES
Authors:   ON BEHALF OF THE HERMES COLLABORATION, MARIANSKI BOHDAN
Published: February 2011

Electroproduction of a ρ0 vector meson in the process γ* + N → V + N′ is measured with a 27.6 GeV longitudinally polarized electron/positron beam in the HERMES experiment. Kinematical dependences of real and imaginary parts of the ratio of the helicity amplitudes [Formula: see text] are extracted from the data.
EXPERIMENTS ON THE STUDY OF DEUTERON-PROTON INTERACTION AT INTERNAL TARGET AT NUCLOTRON
Authors: PIYADIN S. M. , GURCHIN YU. V. , KURILKIN P. K. , TEREKHIN A. A. , GLAGOLEV V. V. , ISUPOV A. YU. , ITOH K. , JANEK M. , KARACHUK J.-T. , KAWABATA T. , KHRENOV A. N. , KISELEV A. S. , KIZKA V. A. , KRASNOV V. A. , KURILKIN A. K. , LADYGIN V. P. , LADYGINA N. B. , LIVANOV A. N. , MAEDA Y. , MALAKHOV A. I. , MARTINSKA G. , PLEKHANOV E. B. , REZNIKOV S. G. , SAKAGUCHI S. , SAKAI H. , SASAMOTO Y. , SEKIGUCHI K. , SEMENOV A. K. , SHIKHALEV M. A. , SUDA K. , TUMANOV A. E. , UESAKA T. , VASILIEV T. A. , WITALA H.
Published: February 2011

The experimental program on the study of deuteron-proton interaction at Internal Target at Nuclotron is discussed. Recent results on the deuteron vector and tensor analyzing powers in dp -elastic scattering obtained at intermediate energies are presented. The status of the DSS setup upgrade is reported.
FUTURE MEASUREMENTS OF THE PROTON TIME LIKE FORM FACTORS WITH $\rm {{\bar PANDA}}$
Authors:   FOR THE PANDA COLLABORATION, GUMBERIDZE MAŁGORZATA
Published: February 2011

We present feasibility studies of a precise measurement of the |GE| and |GM| proton form factors that will be possible in the future with the [Formula: see text] detector.
QCD COUPLING CONSTANT FROM DIFFRACTIVE DEEP INELASTIC SCATTERING
Authors: MONFARED S. TAHERI , KHORRAMIAN ALI N.
Published: February 2011

Determination of αs is one of the most important issue in high energy physics. Measurements of deep inelastic diffraction provide a chance to study this parameter besides diffractive parton distribution functions (DPDFs). Regarding the fact that LHC data is coming, it is hoped that precision measurements of diffraction in Deep Inelastic Scattering (DIS) provide a more complete understanding of strong coupling constant. We performed advanced theoretical calculations to determine Λ and DPDFs.
ω AND η MESON PRODUCTION IN p+p REACTIONS AT Ekin = 3.5 GeV
Authors:   FOR THE HADES COLLABORATION, TEILAB KHALED
Published: February 2011

We report on the exclusive production of ω and η mesons in p + p reactions at 3.5 GeV beam kinetic energy. Production cross sections, angular distributions and Dalitz plots of both mesons were determined. Moreover, the relative contribution of the N(1535) resonance in η production at this energy was evaluated. We conclude that η mesons produced via N(1535) exihibit an isotropic angular distribution, whereas those produced directly show a strong anisotropic distribition. ω mesons show a slightly anisotropic angular distribition.