bluuebunny/crossref_metadata_2025_split huggingface dataset:
Correlations between multiplicities and transverse momenta in nucleus-nucleus collisions from model with cluster of fused color strings
Authors: Andronov E , Kovalenko V 
Published: November 2019

Abstract
The long-range rapidity correlations between the multiplicities (n-n) and the transverse momentum and the multiplicity (pT-n) of charged particles are analyzed in the framework of the simple string inspired model with two types of sources. The sources of the first type correspond to the initial strings formed in a hadronic collision. The sources of the second type imitate the appearance of the emitters of a new kind resulting from interaction (fusion) of the initial strings. The model enabled to describe effectively the influence of the string fusion effects on the strength both the n-n and the pT-n correlations. Modification of the model to the analogue of the “core-corona” mechanism allows to take into account event selection criteria based on centrality and perform a comparison with existing experimental data on correlation measurements in nucleus-nucleus collisions at LHC energies. It is shown that string fusion effects in the model with the core-corona mechanism lead to the change of a sign of the pT-n correlation coefficient with a decrease of a centrality interval width.
The study of the 12C states from the reaction 11B(3He, d)12C
Authors: Starastsin V I , Demyanova A S , Danilov A N , Ogloblin A A , Dmitriev S V , Sergeev V M , Maslov V A , Sobolev Yu G , Goncharov S A , Trzaska W , Heikkinen P , Gurov Y , Belyaeva T L , Burtebaev N 
Published: November 2019

Abstract
The experiment was done to study 11B(3He, d)12C reaction with energy E(3He)=25 MeV. The aim of the experiment is to determine the properties of 12C states at high excitation energies and in particular to verify which of the conflicting spin-parity assignments of the 13.35 MeV state (2− or 4−) should be assigned. Behavior of the experimental angular distribution and also the DWBA calculation correspond to spin parity 4− for 13.35 MeV state.
8He spectroscopy in stopped pion absorption by 11B nuclei
Authors: Chernyshev B A , Gurov Yu B , Lapushkin S V , Leonova T I , Sandukovsky V G 
Published: November 2019

Abstract
Level structure of 8He has been studied in the reaction of stopped pion absorption by 11B nuclei 11B(π−,pd)X. The experiment was carried out at the LANL with a two-arm semiconductor spectrometer. The missing mass spectrum in the range 0 MeV < MM < 50 MeV has been described by the superposition of phase-space distributions and the six states of 8He. Parameters of these states have been compared with data of other experimental and theoretical works.
Why the hydrodynamics is valid at early stage of heavy-ion collisions?
Authors: Zabrodin E E , Bravina L V 
Published: November 2019

Abstract
Evolution of hot and dense nuclear matter produced in central Au+Au collisions at energies of NICA, FAIR, and SPS is studied within two transport models. Two interesting features in the matter behaviour are observed almost from the very beginning of the collisions, at t ≥ 2 fm/c, for all studied reactions. (i) Expansion of the system proceeds with constant entropy-per-baryon ratio. (ii) Effective equation of state has a linear form, P = aε, a ≃ const. Both observations support the formal application of hydrodynamics at the early stages of heavy- ion collisions, when the system is very far from the equilibrium.
STAR Highlights and Future
Authors: Nigmatkulov Grigory 
Published: November 2019

AbstractWe present recent results from the STAR experiment at Relativistic Heavy Ion Collider (RHIC): beam-energy dependence of directed flow of identified particles (including open charm hadrons), flow decorrelation, global and local hyperon polarization, femtoscopic measurements, heavy flavour production, jets, and plan for the future upgrades.
Measurements of quarkonia and open heavy-flavour production in heavy-ion collisions with the ATLAS detector
Authors: Kremer Jakub 
Published: November 2019

Abstract
Measurements of quarkonia produced in ultrarelativistic Pb+Pb collisions provide a means to probe the properties and evolution of the hot and dense medium created in those collisions. Promptly produced quarkonia are directly affected by the interaction with the hot nuclear matter, while non-prompt production allows for the study of b-quark energy loss. The studies of quarkonia production are complemented by measurements of the azimuthal modulation of J/ψ production. Studies of quarkonia and open-charm production in p+Pb collisions provide an additional insight, as they directly probe cold nuclear matter effects. This report will present the most recent ATLAS measurements of charmonia production and flow in Pb+Pb collisions, as well as charmonia and bottomonia production in p+Pb collisions. In addition, results on D meson production and flow will be presented.
Measurement of electroweak boson production in pp, p+Pb and Pb+Pb collisions with the ATLAS detector
Authors: Janus Piotr 
Published: November 2019

Abstract
Measurement of electroweak boson production in different collision systems are of great interest to understanding the partonic structure of heavy nuclei, and serve as a constraint on the initial state in larger collision systems. Their production yields in Pb+Pb with respect to pp collisions provide direct tests of both binary collision scaling and possible modification of parton distribution functions (nPDF) due to nuclear effects. Further, the p+Pb collisions provide a relatively clean environment to study nPDFs in detail. The ATLAS detector has a broad acceptance with excellent performance even in the high occupancy environment of central heavy-ion collisions. In this proceedings the latest ATLAS results on W and Z boson production at the centre-of-mass energy of 5.02 TeV are presented, including updated precise result production in pp collisions. Also photon yields are reported in 8.16 TeV in different collision systems are presented.
Overview of ALICE results on light flavour hadron production
Authors: Riabov V G 
Published: November 2019

Abstract
Light flavour hadrons are copiously produced in hadronic and heavy-ion interactions and bring a wealth of information about properties of the produced medium and reaction dynamics. Having different masses, quark content and lifetimes, light flavour hadrons do not only serve as general observables in the soft sector, but also play an important role as high transverse momentum probes and signatures of the onset of collectivity in high-multiplicity collisions of small and large systems. In this manuscript, we review the most recent ALICE results on the production of different light-flavour hadrons, including transverse momentum spectra, yields, nuclear modification factors and particle ratios in pp, p-Pb, Xe-Xe and Pb-Pb collisions at LHC energies.
Performance studies for collective flow measurements with CBM at FAIR
Authors: Blau D , Golosov O , Kashirin E , Klochkov V , Selyuzhenkov I 
Published: November 2019

Abstract
We present recent results from CBM performance studies for measurements of the directed (v
1) flow of π+, Ʌ and

K
s
0

. For the performance studies we use the CBMROOT environment for Monte-Carlo simulations and event reconstruction. The Kalman Filter Particle Finder (KFParticleFinder) package is used for hyperon reconstruction via their weak decays, and the Projectile Spectator Detector (PSD) for event plane determination. A status of the fast simulator implementation for the PSD calorimeter response, which is required for high statistics simulation, is also presented.
Monte-Carlo study of long-range correlations of average transverse momentum and multiplicity for strange particles in pp-collisions at the LHC energies
Authors: Sandul V , Feofilov G 
Published: November 2019

Abstract
This study is motivated by the puzzling enhanced production of multi-strange hadrons observed for the first time by the ALICE Collaboration in high-multiplicity pp-collisions at

s

=
7

TeV

at the LHC. We investigate this effect of strangeness enhancement in pp-collisions in the framework of the MC event generator PYTHIA 8 where the collectivity processes are taken into account by the formation of a so-called flavour rope. The latter is hadronized with a larger effective string tension providing the increase of strangeness yield. This concept of the flavour rope, as a source of multi-strange hadrons, extended in rapidity, is being tested by the study of so called long-range correlations (LRC) between the average transverse momentum 〈pT
〉 and multiplicity n for charged particles containing strange quarks produced in high energy pp-collisions.The dependencies of correlation coefficients bn−n, bPT−n
and bPT−PT
on the gap between forward and backward pseudorapidity windows, and on the width of the forward pseudorapidity windows, are studied and the results are discussed.
Measurements of the Higgs boson by ATLAS and CMS
Authors: Tsukerman Ilya 
Published: November 2019

Abstract
Recent results on Higgs boson production and decays in the ATLAS and CMS experiments at the LHC are reviewed. They are mostly based on the analyses of 13 TeV LHC proton-proton collision data accumulated during 2015–2016 or 2015–2017 year exposures. Production cross sections in five main decay channels are measured. These channels are combined to extract the Higgs boson signal strength, mass and couplings. All experimental results are found to be compatible with the Standard Model predictions. Upper limits on non-standard Higgs boson production in different decay modes are also derived.
Proposal of the complete experiment for elastic pp and p(bar)p scattering at SPASCHARM program at U70 accelerator
Authors: Bogdanov A A , Chetvertkova V A , Kalugin N K , Ladygin V P , Mochalov V V , Nurusheva M B , Okorokov V A , Semenov P A , Vasiliev A N , Zherebtsova L S 
Published: November 2019

Abstract
Newly developing SPASCHARM (SPin Asymmetry in CHARMonia) experiment at U70 accelerator will give the unique possibility to measure spin effects with the use of polarized proton and antiproton beams and polarized target. We suggest to carry out the measurements of the pp and p(bar)p elastic scattering spin observables at 16 GeV/c (direct reconstruction of elastic pp and p(bar)p elastic scattering amplitudes at SPASCHARM experiment). To date the direct reconstruction of amplitudes for pp elastic scattering was performed up to 6 GeV/c only, meanwhile there is no available data for p(bar)p elastics scattering. New measurements at SPASCHARM will significantly extend the energy range of the spin studies and will give unique possibility to compare elastic pp and p(bar5)p scattering
The New Results from Multi-quark Exotic States Searches at D0 Experiment
Authors: Popov A 
Published: November 2019

Abstract
Recent results from a search for multi-quark exotic states at D0 experiment (FNAL, USA) are presented. This includes the new data for possible tetraquark state X(5568) decaying to

B
s
0

π
±

, in the channels with semileptonic decays of

B
s
0

mesons. Also, result from the J/ψπ system analysis and an evidence for exotic charged charmoniumlike state Zc
(3900) in semiinclusive weak decays of B-flavored hadrons are presented as well.
Resonance d*(2380) and higher isospin states
Authors: Doroshkevich E A 
Published: November 2019

Abstract
A new isoscalar state in the two-baryon system with mass 2380 MeV and width 80 MeV denoted now d*(2380) has been detected in the experiments at the Juelich Cooler Synchrotron (COSY). Existence or influence of states with higher isospin is a subject of the experiment for studing of the π+π− production in pp collisions. Calculations taking into account isotensor dibaryon resonance in the ΔN with I(Jp
) = 2(1+) provide a good description of the pp → ppπ+π−
total and differential cross sections.
The automation of choosing of the optimal kinematic variables for discrimination of the electroweak Zγ production
Authors: Belyaev N L , Petukhov A M , Soldatov E Yu 
Published: November 2019

Abstract
The article discusses the automation of the determination for variables of interest (so-called observables), which allow to distinguish electroweak Zγ
production from the inclusive Zγ
production. The preliminary version of the original automation technique was developed. The output distributions obtained with this technique can be used as the discriminants for machine learning tools to separate rare high energy physics process. An overview of performance and rejection power for the technique is presented.
Observation of the

tt¯H

production
Authors: Mellenthin Johannes 
Published: November 2019

Abstract
The top quark is the heaviest elementary particle in the Standard Model, and has an expected Yukawa coupling of order unity. The value of this coupling is a key ingredient to unravel the nature of the observed Higgs boson. The most favourable production mode which has a direct sensitivity to this coupling is the production of a Higgs boson in association with a top-quark pair,

t

t
¯

H

. The observation of this process, based on the analysis of proton-proton collision data at a centre-of-mass energy of 13 TeV with the ATLAS detector at the Large Hadron Collider, is presented.
Study of P-wave

Bs0

states at the CMS experiment
Authors: Polikarpov Sergey 
Published: November 2019

Abstract
The observation of the

B

s
2

*

(
5840
)

0

→

B
0

K
S
0

decay and the evidence for the

B

s
1

*

(
5840
)

0

→

B
0

K
S
0

decay are presented. The analysis uses the data collected by the CMS experiment at the LHC in proton-proton collisions at

s

=
8

TeV

. In addition, properties of the P-wave

B
s
0

mesons are determined, as well as the mass differences M(B0) − M(B+) and M(B*0) − M(B*+), where the latter is measured for the first time.
Study of tau neutrino production in proton-nucleus interactions
Authors: Gornushkin Yury 
Published: November 2019

Abstract
Tau neutrino properties are not so well known in comparison to those of muon or electron neutrinos. The tau neutrino interaction cross-section was directly measured by the DONUT experiment in 2008 on a basis of 9 registered tau neutrinos, and with a large systematical error of 50% due to a poor knowledge of the tau neutrino flux in this beam dump experiment. However, more accurate measurement of the cross section is needed for future neutrino experiments. It would also allow testing the Lepton Universality (LU) of Standard Model in neutrino interactions. Recently several results for B-meson decays (LHCb, Babar) demonstrated hints of possible LU violation. The tau neutrinos are produced in the Ds meson decays to tau, Ds → τ v
T, and the cascade decay of the tau τ → v
T X. DsTau experiment has been proposed to study the tau neutrino production at CERN SPS. It will measure the Ds production differential cross-section in the proton-tungsten interactions. This will allow reducing of the uncertainty due to the tau neutrino flux in the DONUT result from 50% to 10%. The peculiar Ds cascade decay topology ("double kink") in a few mm range will be detected by nuclear emulsion tracker thanks to its excellent spatial resolution (∼50nm).
In 2016 and 2017, we made test beam exposures of nuclear emulsion modules at CERN SPS 400GeV/c proton beam followed by the pilot run in August 2018. A physics run in 2021 is scheduled. The status and prospects of the DsTau project as well as a review of the modern nuclear emulsion technique and the methods of its data analysis are presented.
Reactor antineutrino measurements with DANSS experiment
Authors: Alekseev I 
Published: November 2019

Abstract
Experiments with reactor antineutrino provide a wide range of physics opportunities. Solid state scintillator detector DANSS is placed just below the core of 3.1 GW
th
industrial reactor of Kalininskaya Nuclear Power Plant. The detector features the world highest counting rate of 5000 neutrino events per day with the cosmic rays induced background as low as 130 events per day. The talk covers detector performance of a year and a half operation, reactor power measurements via neutrino flux and effects of fuel burning over the reactor campaign.
The first observation of oscillation effect in Neutrino-4 experiment and analysis of measurement results
Authors: Serebrov A , Ivochkin V , Samoilov R , Fomin A , Polyushkin A , Zinoviev V , Neustroev P , Golovtsov V , Chernyj A , Zherebtsov O , Chaikovskii M , Martemyanov V , Tarasenkov V , Aleshin V , Petelin A , Izhutov A , Tuzov A , Sazontov S , Gromov M , Afanasiev V , Zaytsev M , Gerasimov A , Ryazanov D 
Published: November 2019

Abstract
We report Neutrino-4 experiment results of measurements of reactor antineutrinos flux and spectrum dependence on the distance in range 6-12 meters from the center of the reactor core. Using experimental spectrum, we performed the model independent analysis of restrictions on oscillation parameters

Δ

m

14

2

and sin2 2θ
14. The results of this analysis exclude area of reactor and gallium anomaly at C.L more than 99.7% (> 3σ) for values

Δ

m

14

2

<
3

eV

2

and sin2 2θ14 > 0.1. However, we observed an oscillation effect at C.L 2.8σ in vicinity of

Δ

m

14

2

≈
7.3

eV

2

and sin2 2θ
14 ≈ 0.39. The method of coherent addition of results of measurements, which allows us to directly observe the effect of oscillations, is proposed. The analysis of that effect is presented. In general, it seems that the effect predicted in gallium and reactor experiments is being confirmed but at sufficiently large value of

Δ

m

14

2

. An additional analysis of the measurements was performed taking into account inhomogenei ty of the detector and background instability.
Project KATRIN: First results and future plans.
Authors: Titov Nikita A. 
Published: November 2019

Abstract
The KArlsruhe TRItium Neutrino (KATRIN) experiment aims to make a model-independent determination of the active electron antineutrino mass with an upper limit of 0.2 eV/c2 from the analysis of Tritium beta-spectrum shape near the endpoint. Experimental set-up is fully assembled and undergoes multiple tests. Small amount of Tritium molecules were injected at June 2018 and first spectra were measured. Experimental program for the nearest future includes determination of active electron antineutrino mass with an upper limit of 1.0 eV/c2 and preliminary search for sterile neutrinos with several keV mass.
Experiment BEST-2 with a source of 65Zn on gallium target for the search of neutrino oscillations on a short baseline
Authors: Gorbachev V V , Gavrin V N , Ibragimova T V , Kornoukhov V N , Shikhin A A 
Published: November 2019

Abstract
The proposal for an experiment on a 2-zone gallium target of a solar Galliumgermanium neutrino telescope at the Baksan neutrino observatory of the INR RAS with a 65Zn source for short baseline neutrino oscillations search is considered. The possibilities of determining the parameters of oscillations, the necessary characteristics of the neutrino source, the possibility of its production and its use are described. The expected results of measurements with a 65Zn source are compared with the results expected in the experiment BEST with the 51Cr source.
Method to test Lorentz invariance in electron-capture decay by measuring a neutrino recoil force
Authors: Barabanov A L , Titov O A 
Published: November 2019

Abstract
Due to hypothetical Loretz invariance violation, additional terms arise in the differential rate for neutrino radiation accompanying electron capture by polarized nuclei. These terms, as well as the parity-violating term, can be probed by measurement of a small recoil force acting on a radioactive sample. An expression for this force is obtained for the case of allowed Gamow–Teller transitions. We discuss prospects to measure the force by using the methods of the magnetic resonance force microscopy, present a list of the most suitable isotopes and give the numerical estimates for mass and activity of required radioactive samples.
Atomic effects in antineutrino spectrum of 144Pr
Authors: Lomonosov A , Lukyanchenko L , Skorokhvatov M , Titov O 
Published: November 2019

Abstract
Pr-144 isotope is one of the most favorable antineutrino sources for short-baseline experiments aimed at sterile neutrino search. These experiments require precise theoretical knowledge of the antineutrino spectrum. We calculate antineutrino spectrum of Pr-144 taking into account various corrections with emphasis on corrections due to atomic effects.
Cosmic ray electrons and positrons over decade with the PAMELA experiment
Authors: Mikhailov V V , Adriani O , Barbarino G , Bazilevskaya G A , Bellotti R , Boezio M , Bogomolov E A , Bongi M , Bonvicini V , Bruno A , Cafagna F S , Campana D , Carlson P , Casolino M , Castellini G , De Santis C , Di Felice V , Galper A M , Karelin A V , Kleymenova S O , Koldashov S V , Koldobskiy S , Krutkov S Yu , Kvashnin A N , Leonov A A , Malakhov V V , Marcelli L , Martucci M , Mayorova A G , Menn W , Merge M , Mocchiutti E , Monaco A , Mori N. , Munini R , Osteria G , Papini P , Panico B , Pearce M , Picozza P , Ricci M , Ricciarini S B , Simon M , Sparvoli R , Spillantini P , Stozhkov Yu I , Vacchi A , Vannuccini E , Vasiliev G I , Voronov S A , Yurkin Yu T , Zampa G , Zampa N 
Published: November 2019

Abstract
The PAMELA experiment has measured cosmic ray particles and antiparticles fluxes at Earth orbit from June 2006 till January 2016 onboard the Resurs-DK1 satellite. Measurements were carried out during the solar minimum of 23 solar cycle with negative polarity A < 0 of heliospheric magnetic field till the beginning of 24 cycle with positive polarity A > 0. In this paper, the results of observations of electron and positron fluxes are presented in wide energy range from several hundreds MeVs till several TeVs These measurements provide important information to study cosmic ray sources and propagation in Galaxy and heliosphere.
The single mechanism of solar and galactic cosmic rays acceleration arising during the flare process
Authors: Podgorny I M , Podgorny A I 
Published: November 2019

Abstract
Solar flares take place in the solar corona due to release of magnetic energy accumulated in the magnetic field of current sheet during instability of the current sheet.Solar cosmic rays are accelerated in the inductive electric field of the current sheet. The magnetic field of the solar wind forms the shape of an Archimedes spiral and affects the propagation of solar cosmic rays in interplanetary space. The modern detection of giant flares on the class G star dwarfs with the energy significantly exceeding the energy of the solar flares indicates the possibility of proton acceleration beyond the boundary of the solar system to energies significantly greater than the energy of solar cosmic rays. The recent experimental data shows that the energy of the stellar flares can exceed energy of 1036 erg. It is by 3-4 orders greater than the energy of a large solar flare, and, apparently, the energy of the protons accelerated in these stellar flares can significantly exceed the energy of the particles registered from flares on the Sun. Thus, the flare can be a universal astronomical process responsible for proton acceleration on the Sun and on the stars.