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Hydrodynamic simulations are used to make predictions for the integrated elliptic flow coefficient v_2 in sqrt(s)=5.5 TeV lead-lead and sqrt(s)=14 TeV proton-proton collisions at the LHC. We predict a 10% increase in v_2 from RHIC to Pb+Pb…

Nuclear Theory · Physics 2010-01-24 Matthew Luzum , Paul Romatschke

The collision system and multiplicity dependence of chemical freeze-out temperature ($T_{\rm ch}$) and strangeness saturation factor ($\gamma_{s}$) are obtained by studying the particle ratios at the Large Hadron Collider (LHC) energies.…

High Energy Physics - Phenomenology · Physics 2019-09-02 Rutuparna Rath , Arvind Khuntia , Raghunath Sahoo

The centrality dependence of the charged multiplicity, transverse energy, and elliptic flow coefficient is studied in a hydrodynamic model, using a variety of different initializations which model the initial energy or entropy production…

High Energy Physics - Phenomenology · Physics 2009-10-09 P. F. Kolb , U. Heinz , P. Huovinen , K. J. Eskola , K. Tuominen

Simulated results from a 2+1D relativistic viscous hydrodynamic model have been compared to the experimental data on the centrality dependence of invariant yield, elliptic flow ($v_{2}$), and hexadecapole flow ($v_{4}$) as a function of…

Nuclear Theory · Physics 2013-04-30 Victor Roy , A. K. Chaudhuri , Bedangadas Mohanty

In this paper, we present a systematic study of Xe--Xe collisions at $\sqrt{s_{\mathrm{NN}}} = 5.44$~TeV center-of-mass energy. We employ the Monte Carlo (hydrodynamics plus jets) HYDJET++ model to calculate the pseudorapidity distribution,…

High Energy Physics - Phenomenology · Physics 2025-05-08 Saraswati Pandey , S. K. Tiwari , B. K. Singh

The PHOBOS experiment at RHIC has measured the total multiplicity of primary charged particles as a function of collision centrality in Au+Au collisions at sqrt(s_NN) = 19.6, 130 and 200 GeV. Above sqrt(s_NN) ~ 20 GeV, the total…

Nuclear Experiment · Physics 2007-05-23 B. B. Back , PHOBOS Collaboration

We investigate charged-hadron production in relativistic heavy-ion collisions of asymmetric systems within a nonequilibrium-statistical framework. Calculated centrality-dependent pseudorapidity distributions for p-Pb collisions at…

High Energy Physics - Phenomenology · Physics 2024-11-05 Philipp Schulz , Georg Wolschin

A detailed study of elliptical and triangular eccentricities in the initial state of relativistic heavy ion collisions is presented. A model of randomly distributed sources of energy density in the transverse plane based on the effective…

High Energy Physics - Phenomenology · Physics 2020-07-10 V. L. Korotkikh , A. M. Snigirev

Using our developed new relativistic viscous hydrodynamics code, we investigate the temperature dependence of shear and bulk viscosities from comparison with the ALICE data: single particle spectra and collective flows of Pb+Pb…

Nuclear Theory · Physics 2019-01-08 Kazuhisa Okamoto , Chiho Nonaka

In this article, we reexamine the formulation for extraction of Knudsen number ($K$), the ratio of shear viscosity to entropy density ($\eta/s$), within the incomplete thermalization scenario, using eccentricity scaling of elliptic flow…

High Energy Physics - Phenomenology · Physics 2025-03-05 Arun Kumar Yadav , Partha Pratim Bhaduri , Subhasis Chattopadhyay

In view of the good agreement between the LHCb prompt-eta(c) data at sqrt(s)=7 and 8 TeV and the NLO colour-singlet model predictions --i.e. the leading v^2 NRQCD contribution--, we provide predictions in the LHCb acceptance for the…

High Energy Physics - Phenomenology · Physics 2019-06-26 Yu Feng , Jibo He , Jean-Philippe Lansberg , Hua-Sheng Shao , Andrii Usachov , Hong-Fei Zhang

We derive a simple analytical scaling function which embodies the predictions of high density QCD on the energy, centrality, rapidity, and atomic number dependences of hadron multiplicities in nuclear collisions. Both centrality and…

Nuclear Theory · Physics 2008-11-26 D. Kharzeev , E. Levin

We present the first systematic comparison of the charged-particle pseudorapidity densities for three widely different collision systems, pp, p-Pb, and Pb-Pb, at the top energy of the Large Hadron Collider ($\sqrt{s_{\rm NN}} = 5.02$ TeV)…

Nuclear Experiment · Physics 2023-10-03 ALICE Collaboration

The exclusive production of vector mesons and photons in $ep$ collisions is investigated considering three phenomenological saturation models based on distinct assumptions for the treatment of the dipole - hadron scattering amplitude. The…

High Energy Physics - Phenomenology · Physics 2022-02-09 Ya-Ping Xie , Victor P. Goncalves

The elliptic flow (v2) pattern in terms of hadron mass and transverse momentum pT is qualitatively described for pT < 2 GeV/c by ideal hydrodynamics in Au + Au collisions at RHIC. In addition, for pT = 2 - 6 GeV/c the measured v2 follow a…

Nuclear Experiment · Physics 2019-08-13 H. Masui

The recent results in \sqrt{s}=2.76 TeV Pb+Pb collisions at the Large Hadron Collider (LHC) reported by the ALICE collaboration shows that the power-law energy-dependence of charged hadron multiplicity in Pb+Pb collisions is significantly…

High Energy Physics - Phenomenology · Physics 2011-06-09 Eugene Levin , Amir H. Rezaeian

Xe+Xe collisions at relativistic energies provide us with an opportunity to study a possible system with deconfined quarks and gluons, whose size is in between those produced by p+p and Pb+Pb collisions. In the present work, we have used…

High Energy Physics - Phenomenology · Physics 2019-06-19 Rutuparna Rath , Sushanta Tripathy , Raghunath Sahoo , Sudipan De , Mohammed Younus

One of the main goals in the study of hadronic interactions at LHC energies is the attempt to characterize the mechanisms involved in particle production in different regimes. The charged-particle multiplicity is one of the most interesting…

High Energy Physics - Experiment · Physics 2024-04-08 Alek Hutson

Recently we have shown that the centrality dependence of the multiplicity of different hadron species observed in RHIC and SPS experiments can be well understood in a simple model, dubbed core-corona model. There it is assumed that those…

Nuclear Theory · Physics 2014-11-20 J. Aichelin , K. Werner

We present an analysis of centrality-dependent pseudorapidity distributions of produced charged hadrons in pPb and PbPb collisions at the LHC energy of sqrt{s_NN}=5.02 TeV, and of minimum-bias pPb collisions at 8.16 TeV within the…

High Energy Physics - Phenomenology · Physics 2018-06-05 P. Schulz , G. Wolschin