Wed·Jan 6, 2021Wednesday·January 6, 2021

1. 01*

   Bose-Einstein condensation of pions in proton-proton collisions at the Large Hadron Collider using non-extensive Tsallis statistics

   Suman Deb🇮🇳 · Dushmanta Sahu🇮🇳 · Raghunath Sahoo🇮🇳 · Anil Kumar Pradhan🇮🇳

   The possibility of formation of Bose-Einstein Condensation (BEC) is studied in $pp$ collisions at $\sqrt{s}$ = 7 TeV at the Large Hadron Collider. A thermodynamically consistent non-extensive formulation of the identified hadron transverse momentum distributions is used to estimate the critical temperature required to form BEC of charged pions, which are the most abundant species in a multi-particle production process in hadronic and nuclear collisions. The obtained results have been contrasted with the systems produced in Pb-Pb collisions to have a better understanding. We observe an explicit dependency of BEC critical temperature and number of particles in the pion condensates on the non-extensive parameter $q$, which is a measure of degree of non-equilibrium -- as $q$ decreases, the critical temperature increases and approaches to the critical temperature obtained from Bose-Einstein statistics without non-extensivity. Studies are performed on the final state multiplicity dependence of number of particles in the pion condensates in a wide range of multiplicity covering hadronic and heavy-ion collisions, using the inputs from experimental transverse momentum spectra.

   ↳ hep-phhep-exnucl-exnucl-thEPJA(2021)·12 citations
2. 02*

   Chiral Effective Field Theory and the High-Density Nuclear Equation of State

   C. Drischler🇺🇸 · J.W. Holt🇺🇸 · C. Wellenhofer🇩🇪

   Born in the aftermath of core collapse supernovae, neutron stars contain matter under extraordinary conditions of density and temperature that are difficult to reproduce in the laboratory. In recent years, neutron star observations have begun to yield novel insights into the nature of strongly interacting matter in the high-density regime where current theoretical models are challenged. At the same time, chiral effective field theory has developed into a powerful framework to study nuclear matter properties with quantified uncertainties in the moderate-density regime for modeling neutron stars. In this article, we review recent developments in chiral effective field theory and focus on many-body perturbation theory as a computationally efficient tool for calculating the properties of hot and dense nuclear matter. We also demonstrate how effective field theory enables statistically meaningful comparisons between nuclear theory predictions, nuclear experiments, and observational constraints on the nuclear equation of state.

   ↳ nucl-thastro-ph.HEastro-ph.SRhep-ph+1Ann.Rev.Nucl.Part.Sci.(2021)·249 citations
3. 03*

   Pulse-shape calculations and applications using the AGATAGeFEM software package

   J. Ljungvall (1) ((1) Université Paris-Saclay, CNRS/IN2P3, IJCLab, Orsay, France)🇫🇷

   A software package for modeling segmented High-Purity Segmented Germanium detectors, AGATAGeFEM, is presented. The choices made for geometry implementation and the calculations of the electric and weighting fields are discussed. Models used for charge-carrier velocities are described. Numerical integration of the charge-carrier transport equation is explained. Impact of noise and crosstalk on the achieved position resolution in AGATA detectors are investigated. The results suggest that crosstalk as seen in the AGATA detectors is of minor importance for the position resolution. The sensitivity of the pulse shapes to the parameters in the pulse-shape calculations is determined, this as a function of position in the detectors. Finally, AGATAGeFEM has been used to produce pulse-shape data bases for pulse-shape analyses of experimental data. The results with the new data base indicate improvement with respect to those with the standard AGATA data base.

   ↳ physics.ins-detnucl-exEPJA(2021)·4 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.