Mon·Sep 12, 2016Monday·September 12, 2016

1. 01*

   Measurements of open heavy-flavour production with ALICE at the LHC

   Sudipan De (for the ALICE collaboration)🇮🇳

   In ALICE, open heavy-flavour production is studied through the measurements of the leptons (electrons and muons) from heavy-flavour hadron decays at central and forward rapidity and via the reconstruction of D-meson hadronic decays at mid-rapidity. An overview of the open heavy-flavour production with ALICE in pp ($\sqrt{s}$ = 2.76 TeV and 7 TeV), p--Pb ($\sqrt{s_{\mathrm{NN}}}$ = 5.02 TeV) and Pb--Pb ($\sqrt{s_{\mathrm{NN}}}$ = 2.76 TeV) collisions will be presented. We will discuss the production cross sections, modifications of the transverse momentum distributions, azimuthal anisotropic emissions and correlations with hadrons in comparison with various theoretical predictions.

   nucl-exhep-exhep-phJ.Phys.Conf.Ser.(2016)·2 citations
2. 02*

   Natural constraints on the gluon-quark vertex

   Daniele Binosi🇮🇹 · Lei Chang🇨🇳 · Joannis Papavassiliou🇪🇸 · Si-Xue Qin🇺🇸 · Craig D. Roberts🇺🇸

   In principle, the strong-interaction sector of the Standard Model is characterised by a unique renormalisation-group-invariant (RGI) running interaction and a unique form for the dressed--gluon-quark vertex, ${\Gamma }_{\mu }$; but, whilst much has been learnt about the former, the latter is still obscure. In order to improve this situation, we use a RGI running-interaction that reconciles both top-down and bottom-up analyses of the gauge sector in quantum chromodynamics (QCD) to compute dressed-quark gap equation solutions with 1,660,000 distinct Ansaetze for ${\Gamma }_{\mu }$. Each one of the solutions is then tested for compatibility with three physical criteria and, remarkably, we find that merely 0.55% of the solutions survive the test. Plainly, therefore, even a small selection of observables places extremely tight bounds on the domain of realistic vertex Ansaetze. This analysis and its results should prove useful in constraining insightful contemporary studies of QCD and hadronic phenomena.

   ↳ nucl-thhep-lathep-phnucl-exPRD(2017)·120 citations
3. 03*

   Magnetic catalysis of a finite size pion condensate

   Alejandro Ayala🇲🇽 · Pedro Mercado🇲🇽 · C. Villavicencio🇨🇱

   We study the Bose-Einstein condensation of a finite size pion gas subject to the influence of a magnetic field. We find the expressions for the critical chemical potential and temperature for the onset of condensation. We show that for values of the external magnetic flux larger than the elemental flux, the critical temperature is larger than the one obtained by considering only finite size effects. We use experimentally reported values of pion source sizes and multiplicities at LHC energies to show that if the magnetic flux, produced initially in peripheral heavy-ion collision, is at least partially preserved up to the hadronic phase, the combined finite size and magnetic field effects give rise to a critical temperature above the kinetic freeze-out temperature. We discuss the implications for the evolution of the pion system created in relativistic heavy-ion collisions.

   ↳ hep-phnucl-exnucl-thPRC(2017)·19 citations
4. 04*

   Monte Carlo Particle Lists: MCPL

   Thomas Kittelmann🇸🇪 · Esben Klinkby🇩🇰 · Erik B Knudsen🇩🇰 · Peter Willendrup🇩🇰 · Xiao Xiao Cai🇩🇰 · Kalliopi Kanaki🇩🇰

   A binary format with lists of particle state information, for interchanging particles between various Monte Carlo simulation applications, is presented. Portable C code for file manipulation is made available to the scientific community, along with converters and plugins for several popular simulation packages.

   ↳ physics.comp-phhep-exnucl-exComput.Phys.Commun.(2017)·22 citations
5. 05*

   Do nuclear collisions create a locally equilibrated quark-gluon plasma?

   Paul Romatschke🇺🇸

   Experimental results on azimuthal correlations in high energy nuclear collisions (nucleus-nucleus, proton-nucleus and proton-proton) seem to be well described by viscous hydrodynamics. It is often argued that this agreement implies either local thermal equilibrium or at least local isotropy. In this note, I present arguments why this is not the case. Neither local near-equilibrium nor near-isotropy are required in order for hydrodynamics to offer a successful and accurate description of experimental results. However, I predict the breakdown of hydrodynamics at momenta of order seven times the temperature, corresponding to a smallest possible QCD liquid drop size of 0.15 fm.

   ↳ nucl-thhep-phnucl-exEPJC(2017)·138 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.