bluuebunny/crossref_metadata_2025_split huggingface dataset:
K→πνν¯

and new physics in the neutrinos
Authors: Valencia G 
Published: June 2020

Abstract
We discuss generic effects of new physics on the rare decay modes

K
L

→

π
0

ν

ν
¯

and

K
+

→

π
+

ν

ν
¯

from the point of view of the neutrino sector. We pay particular attention to the cases of right handed neutrino couplings and neutrino lepton flavour violating interactions. The first of these examples requires the existence of a new light (sterile) right-handed neutrino and its contribution to both rates is always additive to the standard model. It is motivated as a possible solution to the so called charged B anomalies. The case of neutrino lepton flavour violating couplings produces interesting constraints on new physics which are competitive with those from standard searches for charged lepton flavour violating in kaons and in some cases better than those from tau decay.
The Optimal Strategy for ε
′/ε in the SM: 2019
Authors: Buras Andrzej J 
Published: June 2020

Abstract
Following the recent analysis done in collaboration with Jason Aebischer and Christoph Bobeth, I summarize the optimal, in our view, strategy for the present evaluation of the ratio ε
′/ε in the Standard Model. In particular, I emphasize the importance of the correct matching of the long-distance and short-distance contributions to ε
′/ε, which presently is only achieved by RBC-UKQCD lattice QCD collaboration and by the analytical Dual QCD approach. An important role play also the isospin-breaking and QED effects, which presently are best known from chiral perturbation theory, albeit still with a significant error. Finally, it is essential to include NNLO QCD corrections in order to reduce unphysical renormalization scheme and scale dependences present at the NLO level. Here µ

c
in m

c
(µ

c
) in the case of QCD penguin contributions and µ

t
in m

t
(µ

t
) in the case of electroweak penguin contributions play the most important roles. Presently the error on ε
′/ε is dominated by the uncertainties in the QCDP parameter

B
6

(
1
/
2
)

and the isospin-breaking parameter

Ω
^

eff

. We present a table illustrating this.
Semileptonic Hyperon Decays at LHCb
Authors: Brea Rodríguez A 
Published: June 2020

Abstract
Semileptonic Hyperon Decays (SHD) allow to test Beyond the Standard Model physics with operators not accessible to kaon decays. In this document we will discuss the prospects of the LHCb experiment to improve the existing measurement of muonic SHD. A background rejection study has been made using the LHCb simulation in order to investigate the power to distinguish between the

Λ
0

→
p

μ
−

ν
¯

decay and its main background, the Λ0 → pπ
− decay. Two variables were explored, and their rejection power was estimated by applying a selection criteria. In addition, the estimated

Λ
0

→
p

μ
−

ν
¯

yield at LHCb was calculated.
Studies of kaonic atoms at the DAΦNE collider: from SIDDHARTA to SIDDHARTA-2
Authors: Sirghi Diana , Amirkhani Aidin , Baniahmad Ata , Bazzi Massimiliano , Bosnar Damir , Bragadireanu Mario , Carminati Marco , Cargnelli Michael , Clozza Alberto , Curceanu Catalina , De Paolis Luca , Del Grande Raffaele , Fabbietti Laura , Fiorini Carlo , Guaraldo Carlo , Iliescu Mihail , Iwasaki Masaiko , Sandri Paolo Levi , Marton Johann , Miliucci Marco , Moskal Paweł , Niedźwiecki Szymon , Okada Shinji , Pietreanu Dorel , Piscicchia Kristian , Scordo Alessandro , Silarski Michal , Sirghi Florin , Skurzok Magdalena , Spallone Antonio , Tüchler Marlene , Doce Oton Vazquez , Widmann Eberhard , Zmeskal Johann 
Published: June 2020

Abstract
The DAΦNE electron-positron collider of the Laboratori Nazionali di Frascati of INFN is a worldwide unique low-energy kaon source and for this reason is suitable for low-energy kaon physics like kaonic atoms and kaon-nucleons/nuclei interaction studies. Kaonic atoms are atomic systems where an electron is replaced by a negatively charged kaon, containing the strange quark, which interacts in the lowest orbits with the nucleus also by the strong interaction. As a result, their study offers the unique opportunity to perform experiments equivalent to scattering at vanishing relative energy. This allows to study the strong interaction between the antikaon and the nucleon or the nucleus “at threshold”, without the need of ad hoc extrapolation to zero energy, as in scattering experiments. The most precise kaonic hydrogen measurement to date, together with an exploratory measurement of kaonic deuterium, were carried out by the SIDDHARTA collaboration at the DAΦNE electron-positron collider of LNF-INFN, by combining the excellent quality kaon beam delivered by the collider with new experimental techniques, as fast and precise Silicon-Drift X-ray Detectors. The measurement of kaonic deuterium will be realized in the near future by SIDDHARTA-2, a major upgrade of SIDDHARTA.
Studies of low-energy K− hadronic interactions with light nuclei by AMADEUS
Authors: Del Grande R , Bazzi M , Bragadireanu A M , Bosnar D , Cargnelli M , Clozza A , Curceanu C , De Paolis L , Fabbietti L , Ghio F , Guaraldo C , Iliescu M , Iwasaki M , Levi Sandri P , Marton J , Miliucci M , Moskal P , Okada S , Piscicchia K , Ramos A , Scordo A , Silarski M , Sirghi D L , Sirghi F , Skurzok M , Spallone A , Vazquez Doce O , Widmann E , Wycech S , Zmeskal J 
Published: June 2020

Abstract
The AMADEUS collaboration aims to provide precise experimental information on the K− strong interaction with nucleons in the low-energy regime. The step 0 of AMADEUS consists in the re-analysis of the data collected with the KLOE detector at the DAΦNE collider during the 2004/2005 data taking campaign. The absorptions of low-momentum K−s in the nuclei contained in the detector and the beam pipe setup (H, 4He, 9Be and 12C) are investigated. Information on the K− single and multi-nucleon interactions are extracted from the study of the Λπ
− and p correlated production in the final state.
Calorimeter Upgrade of the KOTO experiment with both-end readout of CsI crystals with MPPCs
Authors: Nanjo H 
Published: June 2020

Abstract
We are searching for the decay

K
L

→

π
0

ν

ν
¯

in the KOTO experiment at J-PARC. The signal is identified by detecting two photons from the π
0 decay with a calorimeter composed of undoped CsI crystals. The main background “hadron cluster background” is caused by a neutron hitting the calorimeter to form two clusters: a neutron in the beam halo hits the calorimeter to generate the first cluster, and a secondary neutron generated in the interaction creates the second separated cluster. In order to reduce this background, we upgraded the calorimeter to have both-end readout by attaching MPPCs on the upstream face of each CsI crystal in addition to the original PMT attached on the downstream face. The background can be rejected exploiting the timing difference between the MPPC and PMT, since neutrons tend to interact deeper inside the crystals. We installed the MPPCs in 2018, and evaluated the performance with data taken in 2019. The principle in the calorimeter upgrade and the performance of the background reduction are reported.
A future

KL0→π0νν¯

experiment at J-PARC
Authors: Nomura Tadashi 
Published: June 2020

Abstract
A next-generation experiment at J-PARC to measure the branching ratio of

K
L
0

→

π
0

ν

ν
¯

is being considered. The currently-running experiment in the Hadron Experimental Facility of J-PARC, the KOTO experiment, will reach a sensitivity below 10−10 in 3–4 years but would take longer time toward the sensitivity predicted by the Standard Model. It is desirable to have a new experiment that can observe O(100) events and measure the branching ratio of

K
L
0

→

π
0

ν

ν
¯

. Such an experiment, so-called KOTO step-2, has been discussed as a part of the project of the facility extension. A new beam line with a smaller production angle and a larger detector, accommodated in the extended facility, will provide a higher kaon ux and a larger detection acceptance, and thus brings a better sensitivity. In this paper, a baseline design of the KOTO step-2 and its potential sensitivity are discussed.
Feebly-interacting particles: experimental landscape
Authors: Lanfranchi G. 
Published: June 2020

Abstract
Feebly-interacting particles represent an alternative paradigm with respect to the traditional strongly-coupled Beyond the Standard Model physics explored at the LHC and can provide an answer to many fundamental open questions in particle physics. This document presents the state of the art of searches for feebly-interacting particles at accelerator-based experiments including projects proposed at CERN and currently discussed in the European Strategy for Particle Physics update.
Search for invisible dark photon at NA62
Authors: Spadaro T 
Published: June 2020

Abstract
Very weakly coupled new-physics particles in the MeV-GeV range appear as mediators in various “portals” to a hidden sector. Their interaction with Standard Model particles is feeble and these states are usually long-lived, so that the experimental search fully profits of a high-intensity setup, such as that of fixed-target experiments. Within the vector portal hidden-sector model a dark photon might exist which predominantly decays to dark matter particles. A search for such an invisible particle has been performed, exploiting the efficient photon-veto capability and high resolution tracking of the NA62 detector at CERN. The signal stems from the chain K
+ → π
+
π
0 followed by the π
0 decay to a photon-dark-photon pair. No significant statistical excess has been identified. Upper limits on the dark photon coupling to the ordinary photon as a function of the dark photon mass have been set.
Dark Sector Physics with Belle II
Authors: Corona L 
Published: June 2020

Abstract
The Belle II experiment at the SuperKEKB energy-asymmetric e
+
e
− collider is a substantial upgrade of the KEKB facility at the Japanese KEK laboratory. The design luminosity of the machine is 8 · 1035 cm−2s−1 and the Belle II experiment aims to record 50 ab−1 of data, a factor of 50 more than its predecessor. From February to July 2018, the machine has completed a commissioning run, where about 0.5 fb−1 of data have been collected. Regular operation of SuperKEKB has started in March 2019: the machine has achieved a peak luminosity of 1034 cm−2s−1, and Belle II has recorded a data sample of about 6.5 fb−1. Already this early data set with specifically designed triggers offers the possibility to search for a large variety of dark sector particles in the GeV mass range complementary to searches at LHC and dedicated low energy experiments. The Belle II dark matter analyses will benefit from more data in the process of being accumulated. This talk will review the state of the dark sector searches at Belle II with a focus on the discovery potential of the early data, and show the first results.
The Data-Acquisition System with Cluster-Finding Trigger at the J-PARC KOTO Experiment
Authors: Lin C , Hsiung Y B , Wah Y W , Tung Y C , Luo Y T , Bogdan M 
Published: June 2020

Abstract
In order to collect the events efficiently with a high intensity beam, we built a new trigger electronics system based on the calibrated energy information and the number of electromagnetic shower clusters in the calorimeter for the J-PARC KOTO experiment. The dead time of this system is 0.16 µs and the loss was measured to be less than 1%. By performing the online clustering algorithm on the simulated data, the trigger efficiency for the primary mode

K
L

→

π
0

ν

ν
¯

is estimated to be 99.6%.
Construction of the double-side readout calorimeter for

KL→π0νν¯

search
Authors: Kotera K 
Published: June 2020

Abstract
We study the rare decay

K
L

→

π
0

ν

ν
¯

at the KOTO experiment at J-PARC. To detect two photons from the π
0, the KOTO detector consists of a cesium iodide (CsI) calorimeter and hermetical veto counters. The calorimeter is made of 50 cm-long CsI crystals stacked in a cylinder of 1.9 m diameter. Each crystal is read out with a PMT on its rear side. One of the major backgrounds is caused by a neutron generating two clusters in the calorimeter. To reject such events, we have upgraded the calorimeter to distinguish photon clusters from neutron clusters by measuring the time difference of the scintillation light at the front and rear ends of the crystals. We established the methods to install 4080 silicone photomultipliers on the front surface of crystals for this purpose.
Neutron rejection performance of the upgraded KOTO CsI calorimeter
Authors: Osugi M 
Published: June 2020

Abstract
We are searching for the

K
L

→

π
0

ν

ν
¯

decay at the J-PARC KOTO experiment. The signature of the signal events is two photons from a π
0 decay and no other detectable particles. One of the main backgrounds is caused by neutrons in the beam halo. If a beam halo neutron produces a hadronic shower in the calorimeter and a secondary neutron interacts at a different position in the calorimeter, it can mimic the

K
L

→

π
0

ν

ν
¯

decay. To suppress this hadron-cluster background, we installed MPPCs (silicon photo sensor) on the upstream surface of the CsI calorimeter in 2018. Neutrons and photons can be distinguished by using the timing difference between the MPPC signal from upstream and the PMT signal from downstream. The hadron-cluster background is suppressed to a 2.2% level retaining the 90% signal efficiency.
Comparative Analysis of Neutron, Proton, Alpha and Beta Radiation Shielding Parameters of PES and PVDC
Authors: Thakur Sonika , Kaur Parminder 
Published: June 2020

Abstract
In medical applications, where polymers and plastics are used as tissue equivalent and phantom materials, the determination of accurate values of radiation shielding parameters becomes very important. In this context, the present work is aimed at determining the values of radiation shielding parameters of two polymers, viz. polyethersulphone (PES) and polyvinylidenechloride (PVDC) and then doing a comparative analysis of their shielding abilities in order to find a better material for shielding. The neutron shielding parameter was determined and was also compared with some common neutron shielding materials such as Boric Acid, Boron Carbide and Graphite. Furthermore, the shielding against charged particles i.e. neutron, proton and alpha particle was also studied with the help of the parameters, ‘mass stopping power’ and ‘projected range’. It was speculated that PES is superior to PVDC for shielding against neutrons, protons, alpha and beta radiation due to higher content of low atomic number elements per monomer unit. So, PES can be used potentially for radiation shielding in medical field.
Structural and Optical Properties of Sr2Co1.9Bi0.1Fe11.9 Zn0.1O22/PANI Nanocomposites
Authors: Sharma Shaweta , Mohammed J. , Trudel Tchouank Tekou Carol , Getso R.S , Kumar Pushpendra , Basandrai D. , Srivastava A. K. 
Published: June 2020

Abstract
Recently Hexaferrites have attracted the attention of researchers due to its wide applications such as permanent magnets, magnetic recording media, microwave applications and Wireless telecommunication system. Sr2Co1.9Bi0.1Fe11.9 Zn0.1O22 was successfully synthesized using sol-gel method while oxidative polymerization was employed to synthesized polyaniline (PANI). The precursor material is pre sintered at 500°C for 5 hours and sintered at 1000°C for 5 hours. The characteristics of the samples were defined by using X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), Raman spectroscopy and Ultraviolet visible spectrophotometer (UV-vis). XRD analysis confirms the spectral purity of the sample. FTIR analysis indicates the formation of y-type hexaferrites by the appearance of two prominent peaks at 400 and 600 cm−1. Raman spectra show the presence of Y-type hexaferrites and PANI by the appearance of prominent Raman shifts. The band gap of the prepared nanocomposites was evaluated using UV-vis spectroscopy.
Nonlinear Evolution of q-Gaussian Laser Beams in Preformed Parabolic Plasma Channels
Authors: Gupta Naveen , Singh Rajender 
Published: June 2020

Abstract
Theoretical investigation on nonlinear propagation characteristics of q-Gaussian laser beams in preformed parabolic plasma channels has been presented. The optical response of the channel has been modelled by ponderomotive nonlinearity. Following Virial theorem in W.K.B approximation, semi analytical solution of the wave equation for the field of laser beam has been obtained. Particularly the evolutions of beam width and axial phase of the laser beam have been investigated in detail. Self trapping of the laser beam arising as a consequence of the cancellation of diffraction broadening by nonlinear refraction of the laser beam has also been investigated.
Theoretical and experimental ultrasonic velocities Comparison of binary mixtures of triethylene glycols and glycerol at different temperatures
Authors: Chakraborty Nabaparna , Kaur Parminder , Kaur Kirandeep , Juglan Kailash Chandra , Kumar Harsh 
Published: June 2020

Abstract
The densities and sound velocities of binary mixtures of triethylene glycol are measured at different temperatures and at frequency of 2 MHz over entire range of mole fraction. Various theoretical models, such as Nomoto, Impedance, Junjie, Van Dael and Vangeel, have been used to measure theoretical ultrasonic velocities. The average percentage error was estimated and the chi-square fitness test was also used to check the validity of theoretical models. The variance from the experimental results is interpreted in terms of molecular interactions between the components of the binary mixtures.
Study of intermolecular interaction of binary mixture of adrenaline and KOH
Authors: Kaur Parminder , Chakraborty Nabaparna , Singh Satnam , Juglan K.C. , Kumar Harsh 
Published: June 2020

Abstract
The Density and Ultrasonic Velocity of Adrenaline with KOH have been measured at different range of temperatures for different concentrations. Ultrasonic velocity and density values increases with increase in concentration. By using ultrasonic and volumetric data various parameters such as adiabatic compressibility, acoustic impedance, available volume, molar volume, intermolecular free length, Rao’s constant, Wada’s constant, Van Der Waal Constant, relative intensity and effective molecular weight have been calculated. With rise in temperature the interaction between the solute and solvent particles increases, which is confirmed by available volume and intermolecular free length. The non-linear variations in Rao’s constant, Wada’s constant, Van Der Waal Constant and other parameters suggest the presence of complex formation or charge transfer interaction or dipole-dipole interaction or dispersive forces or maybe all in the solution.
Optimization of electrical and optical properties of tin sulfide for thin film photovoltaics using SCAPS
Authors: Kancharla Srikanth , Kaushik Deepak Kumar 
Published: June 2020

Abstract
Tin sulfide (SnS), being a binary metal chalcogenide, can be a potential absorber material for the thin film photovoltaics because of its optimum direct bandgap (1.3 eV) and high absorption coefficient (>104 cm−1). In the present work, the electrical and optical properties of SnS thin film solar cells have been optimized and analyzed by Solar Cell Capacitance Simulator (SCAPS). The effect of thickness and optical band gap of SnS absorber layer on the J-V curve have been investigated to obtain better device performance. The maximum photovoltaic (PV) efficiency achieved by the PV device is 22.3 % with VOC = 756 mV, JSC = 34.9 mAcm−2 and FF = 84.4 %. The VOC value is higher than the reported values for kesterite CZTSSe absorber based solar cells. Consequently, the SnS can be a potential contender for the contemporary thin film solar cells.
Groundwater Contamination By E-Waste And Its Remedial Measure - A Literature Review
Authors: Gupta N. , Nath M. 
Published: June 2020

AbstractThe very precious resource of Earth, the groundwater is being contaminated and polluted day by day. E-Waste is one of the major cause for this problem related to ground water. E-wastes are produced mainly due to discarded electronic gadgets like PCs, tablets, hard drives, printers, monitors, batteries, mobile phones, television, etc. The use of these electronic gadgets is increasing enormously day by day around the globe. Lack of awareness about the proper disposal of these e-wastes cause serious health and environmental issue in developing countries like India and to some extent in developed countries. Discarded computers, mobile phones and other electronic equipment that are considered as e –waste contain hazardous toxic metals like chromium, lead, mercury, iron, zinc, copper, cadmium etc. These e –wastes are dumped in the landfills near the industries where large area of land is available. As most of the industries are located near the water sources, the toxic e-wastes are percolated inside the water hence make the water contaminated inside the deep aquifers. This water is not safe for drinking and other purposes. The quantity of pollutants is more near to the landfill sites and reduces as the distance between the landfill site and aquifer increases. In the present work, a literature survey of groundwater pollution by e-waste and its remedial measure to reduce groundwater contamination is being done.
Near Infrared Spectroscopy as an efficient tool for the Qualitative and Quantitative Determination of Sugar Adulteration in Milk
Authors: Kamboj Uma , Kaushal Neha , Jabeen Shakira 
Published: June 2020

Abstract
The present work focuses on detecting the presence of sugar as an adulterant in milk using Near Infrared Spectroscopy. A chemometric model was formulated to evaluate the presence of sugar content in milk, qualitatively as well as quantitatively using multivariate analysis. Total 24 samples were prepared using three different varieties of milk, out of which three samples were pure and the rest were having sugar present in them. Those 21 milk samples were adulterated with sugar at seven different levels: 0.2%, 0.4%, 0.6%, 0.8%, 1.6%, 3.2%, 0.8% and 6.4% of sugar respectively for each kind of milk. The data collected from NIRS instrument was analyzed using chemometric software (CAMO Unscrambler version X 10.3). The Principal Component Analysis was run on the sample set to know the relation between the different samples on the basis of the Near Infrared spectral data. It was observed that the PCA score plot could classify the samples in three different groups on the basis of their adulteration: low, medium and high adulteration. Partial least square (PLS) regression analysis was used to develop a statistical model to predict the percentage of sugar in the adulterated milk samples by selecting vital wavelengths. It was noticed that the regression model revealed quite good results for the prediction of sugar adulterated milk samples with the coefficient of correlation higher than 0.9 and the root means square error of validation (RMSEV) was 0.04. Thus, it was concluded that NIR spectroscopy could provide dairy industry a simple, efficient, quick, green and non-destructive technique for detection and quantification of milk adulteration.