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Nuclear Theory·nucl-th

Tuesday·November 13, 2018

13 papers—9 primary·4 cross-listed

All13Primary9Cross-lists4
  1. 10

    Space-Time Picture of Baryon Stopping in the Color-Glass Condensate

    Larry D. McLerran🇺🇸 · Sören Schlichting🇩🇪 · Srimoyee Sen🇺🇸

    We discuss baryon stopping in the Color Glass Condensate description of high energy scattering. We consider the scattering of a distribution of valence quarks on an ultra-relativistic sheet of colored charge. We compute the distribution of scattered quarks from a composite projectile, and calculate the baryon currents before and after the collisions and on an event by event basis. We obtain simple analytic estimates of the baryon number compression and rapidity shifts, which in the idealized case of plane wave scattering, produce results that agree with considerations of Anishetty-Koehler-McLerran.

    ↳ hep-phnucl-thPRD(2019)·24 citations
  2. 11

    Event Shape Engineering and Multiplicity dependent Study of Identified Particle Production in proton+proton Collisions at = 13 TeV using PYTHIA8

    Arvind Khuntia🇮🇳 · Sushanta Tripathy🇮🇳 · Ashish Bisht🇮🇳 · Raghunath Sahoo🇮🇳

    Small system collectivity observed at the LHC energies along with enhancement of strangeness makes high-multiplicity proton+proton (pp) collisions very interesting in order to look for QGP-like features, usually found in heavy-ion collisions. It may be interesting to perform a double differential study of different observables in pp collisions in terms of charged particle multiplicity and event shape in order to understand the new dimensions in high-multiplicity pp physics. We study the correlation between the number of multi-partonic interactions (nMPI), event shape (transverse spherocity) and charged particle multiplicity classes. For the first time, we report the simulation results on the spherocity and charged particle multiplicity dependent study of (), (K+K), (p+), K, and () production in pp collisions at = 13 TeV using PYTHIA8. We explore the event shape and charged particle multiplicity dependence of the transverse momentum () spectra, integrated yield, mean transverse momentum () and particle ratios of the identified particles. This study provides a baseline for exploring the the event topology and final state multiplicity dependence of identified particle production in the LHC pp collisions.

    ↳ hep-phhep-exnucl-exnucl-thJ.Phys.G(2021)·31 citations
  3. 12

    Does chiral perturbation theory rule out QCD-based solutions to the strong CP problem?

    Thomas D. Cohen🇺🇸

    The conventional view is that a solution of the strong CP problem lies beyond QCD. A strong argument supporting this view is that the chiral expansion shows that observables depend on theta (unless a quark mass is zero); this eliminates the possibility that theta is physically irrelevant and appears to necessitate an explanation beyond the standard model. However, scenarios that solve the strong CP problem exist that are consistent with known chiral behavior; in these, QCD becomes nonviable as a theory for nonzero theta. Such scenarios appear to be compatible with lattice studies of the topological susceptibility.

    ↳ hep-phhep-thnucl-thPRD(2019)·4 citations
  4. 13

    Description of bulk observables in Au+Au collisions at top RHIC energy in the integrated HydroKinetic Model

    M. D. Adzhymambetov🇺🇦 · V. M. Shapoval🇺🇦 · Yu. M. Sinyukov🇺🇦

    The results on the main bulk observables obtained in the simulations within the integrated hydrokinetic model (iHKM) of Au+Au collisions at the RHIC energy GeV are presented along with the corresponding experimental data from the STAR and the PHENIX collaborations. The simulations include all the stages of the collision process: formation of the initial state, its gradual thermalization and hydrodynamization, viscous relativistic hydro-evolution, system's hadronization and particlization, and, finally, an expansion of the interacting hadron-resonance gas. The model gives a satisfactory description of charged-particle multiplicities, particle number ratios, transverse momentum spectra for pions, kaons, protons and antiprotons, charged-particle coefficients, and femtoscopy radii at all collision centralities. It is demonstrated how one can estimate the times of the pion and kaon maximal emission from the femto-scales.

    ↳ hep-phnucl-exnucl-thNPA(2019)·10 citations

Affiliations

first authorsco-authorsvia INSPIRE