Thu·Jan 18, 2018Thursday·January 18, 2018

1. 01*

   Constituent quarks and systematic errors in mid-rapidity charged multiplicity $d{N}_{\mathrm{ch}}/d\eta$ distributions

   M. J. Tannenbaum🇺🇸

   Centrality definition in A$+$A collisions at colliders such as RHIC and LHC suffers from a correlated systematic uncertainty caused by the efficiency of detecting a p$+$p collision ($50\pm 5\%$ for PHENIX at RHIC). In A$+$A collisions where centrality is measured by the number of nucleon collisions, $N_{\mathrm{coll}}$, or the number of nucleon participants, $N_{\mathrm{part}}$, or the number of constituent quark participants, $N_{\mathrm{qp}}$, the error in the efficiency of the primary interaction trigger (Beam-Beam Counters) for a p$+$p collision leads to a correlated systematic uncertainty in $N_{\mathrm{part}}$, $N_{\mathrm{coll}}$ or $N_{\mathrm{qp}}$ which reduces binomially as the A$+$A collisions become more central. If this is not correctly accounted for in projections of A$+$A to p$+$p collisions, then mistaken conclusions can result. A recent example is presented in whether the mid-rapidity charged multiplicity per constituent quark participant $(d{N}_{\mathrm{ch}}/d\eta )/N_{\mathrm{qp}}$ in Au$+$Au at RHIC was the same as the value in p$+$p collisions.

   nucl-exMod.Phys.Lett.A(2017)·5 citations
2. 02*

   On the jets emitted by driven Bose-Einstein condensates

   Miguel Arratia🇺🇸

   Features of the emission of jets by driven Bose-Einstein condensates, discovered by Clark et al. (Nature 551, 356359), can be understood by drawing analogies with particle physics. In particular, the widening of the $\Delta \varphi =\pi$ peak in the angular correlation function is due to a dijet acollinearity, which I estimate to be about 5${}^{\circ }$ RMS. I also propose new correlation studies using observables commonly used in studies of the quark-gluon plasma.

   ↳ cond-mat.quant-gashep-exhep-phnucl-ex+1J.Phys.B(2019)·0 citations
3. 03*

   Observation of Coherent Elastic Neutrino-Nucleus Scattering by COHERENT

   Kate Scholberg🇺🇸

   The COHERENT collaboration measured coherent elastic neutrino-nucleus scattering (CEvNS) for the first time at the Spallation Neutron Source at Oak Ridge National Laboratory, using a CsI[Na] detector. Here we discuss the nature of the CEvNS process, physics motivations, and experimental considerations for measuring CEvNS. We describe the CsI[Na] measurement, along with status and future of COHERENT.

   ↳ hep-exastro-ph.SRhep-phnucl-ex+1PoS(2018)·25 citations
4. 04*

   Scaling properties of spectra in new exact solutions of rotating, multi-component fireball hydrodynamics

   T. Csörgő🇭🇺 · G. Kasza🇭🇺

   We describe fireballs that rehadronize from a perfect fluid of quark matter, characterized by the lattice QCD equation of state, to a chemically frozen, multi-component mixture, that contains various kinds of observable hadrons. For simplicity and clarity, we apply a non-relativistic approximation to describe the kinematics of this expansion. Unexpectedly, we identify a secondary explosion that may characterize fireball hydrodynamics at the QCD critical point. After rehadronization, the multi-component mixture of hadrons keeps on rotating and expanding together, similarly to a single component fluid. After kinetic freeze-out, the effective temperature $T_i$ of the single-particle spectra of hadron type $h_i$ is found to be a sum of the kinetic freeze-out temperature $T_f$ (that is independent of the hadron type $h_i$) and a term proportional to the mass $m_i$ of hadron type $h_i$. The coefficient of proportionality to $m_i$ is also found to be independent of the hadron type $h_i$ but be dependent on the radial flow and vorticity of collective dynamics.

   ↳ nucl-thhep-phnucl-exUniverse(2018)·7 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.