Tue·Jan 13, 2015Tuesday·January 13, 2015

1. 01*

   Results on $\beta \beta$ decay with emission of two neutrinos or Majorons in ${}^{76}$Ge from GERDA Phase I

   M. Agostini · M. Allardt · A.M. Bakalyarov · M. Balata · I. Barabanov · N. Barros · L. Baudis · C. Bauer · N. Becerici-Schmidt · E. Bellotti · S. Belogurov · S.T. Belyaev and 100 other authors

   A search for neutrinoless $\beta \beta$ decay processes accompanied with Majoron emission has been performed using data collected during Phase I of the GERmanium Detector Array (GERDA) experiment at the Laboratori Nazionali del Gran Sasso of INFN (Italy). Processes with spectral indices n = 1, 2, 3, 7 were searched for. No signals were found and lower limits of the order of 10${}^{23}$ yr on their half-lives were derived, yielding substantially improved results compared to previous experiments with ${}^{76}$Ge. A new result for the half-life of the neutrino-accompanied $\beta \beta$ decay of ${}^{76}$Ge with significantly reduced uncertainties is also given, resulting in $T_{1/2}^{2\nu }=(1.926\pm 0.095)\cdot 10^{21}$ yr.

   nucl-exphysics.ins-detEPJC(2015)·128 citations
2. 02*

   Nucleon partonic spin structure to be explored by the unpolarized Drell-Yan program of COMPASS experiment at CERN

   Wen-Chen Chang (for the COMPASS collaboration)🇹🇼

   The observation of the violation of Lam-Tung relation in the $\pi N$ Drell-Yan process triggered many theoretical speculations. The TMD Boer-Mulders functions characterizing the correlation of transverse momentum and transverse spin for partons in unpolarized hadrons could nicely account for the violation. The COMPASS experiment at CERN will measure the angular distributions of dimuons from the unpolarized Drell-Yan process over a wide kinematic region and study the beam particle dependence. Significant statistics is expected from a successful run in 2015 which will bring further understanding of the origin of the violation of Lam-Tung relation and of the partonic transverse spin structure of the nucleon.

   nucl-exhep-phnucl-thInt.J.Mod.Phys.Conf.Ser.(2016)·0 citations
3. 03*

   Study of dynamical charge fluctuations in the hadronic medium

   Bhanu Sharma🇮🇳 · Madan M. Aggarwal🇮🇳 · Nihar Ranjan Sahoo🇺🇸 · Tapan K. Nayak🇮🇳

   The dynamical charge fluctuations have been studied in ultra-relativistic heavy-ion collisions by using hadronic model simulations, such as UrQMD and HIJING. The evolution of fluctuations has been calculated at different time steps during the collision as well as different observation window in pseudorapidity (\DelEta). The final state effects on the fluctuations have been investigated by varying $△\eta$~ and the time steps with the aim of obtaining an optimum observation window for capturing maximum fluctuations. It is found that $△\eta$~ between 2.0 and 3.5 gives the best coverage for the fluctuations studies. The results of these model calculations for Au+Au collisions at $\sqrt{s_{\mathrm{NN}}}$~=~7.7 to 200~GeV and for Pb+Pb collisions at 2.76 TeV are presented and compared with available experimental data from the Relativistic Heavy Ion Collider (RHIC) and the Large Hadron Collider (LHC).

   ↳ nucl-thhep-phnucl-exPRC(2015)·11 citations
4. 04*

   Radiative Decay Width of Neutral non-Strange Baryons from PWA

   Igor I. Strakovsky (GW)🇺🇸 · William J. Briscoe (GW)🇺🇸 · Alexander E. Kudryavtsev (ITEP, GW)🇷🇺 · Viacheslav V. Kulikov (ITEP)🇷🇺 · Maxim A. Martemyanov (ITEP)🇷🇺 · Vladimir E. Tarasov (ITEP)🇷🇺

   An overview of the GW SAID and ITEP groups effort to analyze pion photoproduction on the neutron-target will be given. The disentanglement the isoscalar and isovector EM couplings of N* and Delta* resonances does require compatible data on both proton and neutron targets. The final-state interaction plays a critical role in the state-of-the-art analysis in extraction of the gamma n --> pi N data from the deuteron target experiments. It is important component of the current JLab, MAMI-C, SPring-8, ELSA, and ELPH programs

   ↳ nucl-thhep-exhep-phnucl-exEPJ Web Conf.(2015)·0 citations

* Reconstructed cohort: no mailing for this day survives in the archive. Papers are grouped by their submission times and arXiv's announcement cut-off, assuming announcement without delay; positions follow identifier order. Validated at ~91% exact-day agreement against the archived era.