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We argue that large fluctuations in the saturation momentum are necessary to explain the ATLAS and ALICE data on pA collisions measured at the LHC. Using a form for the distribution of fluctuations motivated by theoretical studies of the…

High Energy Physics - Phenomenology · Physics 2016-05-20 Larry McLerran , Michal Praszalowicz

Anomalous centrality evolution of two-particle angular correlations observed in Au-Au collisions at $\sqrt{s_{NN}} = 62$ and 200 GeV and the onset of ridge structures are considered in the model of interacting quark-gluon strings. We assume…

High Energy Physics - Phenomenology · Physics 2015-02-12 Grigory Feofilov , Igor Altsybeev , Olga Kochebina

Centrality-dependent double-differential transverse momentum spectra of negatively charged particles ($\pi^-$, $K^-$ and $\bar p$) at mid-(pseudo)rapidity interval in nuclear collisions are analyzed by the standard distribution in terms of…

High Energy Physics - Phenomenology · Physics 2020-05-28 Muhammad Waqas , Fu-Hu Liu , Zafar Wazir

The several types of strongly intensive correlation variables are studied in nuclear collisions at LHC energy. These quantities are expected not to depend on centrality class width. They have been calculated in the dipole-based…

Nuclear Theory · Physics 2019-04-05 Vladimir Kovalenko

Long range correlations multiplicity-multiplicity, $p_T^2$-multiplicity and $p^2 - p^2_T$ are studied in the percolating colour string picture under different assumptions of the dynamics of string interaction. It is found that the strength…

High Energy Physics - Phenomenology · Physics 2009-11-10 M. A. Braun , R. S. Kolevatov , C. Pajares , V. V. Vechernin

A brief introduction of the relationship of string percolation to the Quantum Chromo Dynamics (QCD) phase diagram is presented. The behavior of the Polyakov loop close to the critical temperature is studied in terms of the color fields…

Nuclear Theory · Physics 2015-12-22 M. A. Braun , J. Dias de Deus , A. S. Hirsch , C. Pajares , R. P. Scharenberg , B. K. Srivastava

Multiparticle production at high energies is described in terms of color strings stretched between the projectile and target. As the string density increases, overlap in the transverse plane leads to cluster formation. At some critical…

Nuclear Experiment · Physics 2008-11-26 Terence Tarnowsky , Rolf Scharenberg , Brijesh Srivastava

We calculate the centrality-dependence of transverse momentum ($\pt$) spectra for direct photons in Au+Au collisions at the RHIC energy, based on a realistic data-constrained (3+1) dimensional hydrodynamic description of the expanding hot…

High Energy Physics - Phenomenology · Physics 2009-02-18 Fu-Ming Liu , Tetsufumi Hirano , Klaus Werner , Yan Zhu

The study of long-range correlations between observables in two rapidity windows was proposed as a signature of the string fusion and percolation phenomenon. In the present work we calculate the correlation functions and coefficients for…

Nuclear Theory · Physics 2014-10-16 Vladimir Kovalenko

We study the RHIC data on long range rapidity correlations, comparing their main trends with different string model simulations. Particular attention is paid to color percolation model and its similarities with color glass condensate. As…

High Energy Physics - Phenomenology · Physics 2011-03-17 C. Pajares

We have studied the centrality dependence of charged particle forward-backward multiplicity correlation strength in Au+Au collisions at $\sqrt{s_{NN}}$=200 GeV with a parton and hadron cascade model, PACIAE, based on PYTHIA. The calculated…

Nuclear Theory · Physics 2010-06-01 Yu-Liang Yan , Dai-Mei Zhou , Bao-Guo Dong , Xiao-Mei Li , Hai-Liang Ma , Ben-Hao Sa

While string models describe initial state radiation in ultra-relativistic nuclear collisions well, they mainly differ in their end-point positions of the strings in spatial rapidity. We present a generic model where wounded constituents…

Nuclear Theory · Physics 2019-06-11 Martin Rohrmoser , Wojciech Broniowski

Multiparticle production at high energies is described in terms of color strings stretched between the projectile and target. As string density increases, overlap among the strings leads to cluster formation. At some critical density a…

Nuclear Experiment · Physics 2008-11-26 Terence J. Tarnowsky , Brijesh K. Srivastava , Rolf P. Scharenberg

First results from RHIC on charged multiplicities, evolution of multiplicities with centrality, particle ratios and transverse momentum distributions in central and minimum bias collisions, are analyzed in a string model which includes hard…

High Energy Physics - Phenomenology · Physics 2009-11-07 N. Armesto , C. Pajares , D. Sousa

In most of the models of hadronic collisions the number of exchanged colour strings grows with energy and atomic numbers of the projectile and target. At high string densities interaction between them should melt them into the quark-gluon…

High Energy Physics - Phenomenology · Physics 2009-10-30 M. A. Braun , C. Pajares , J. Ranft

Recently, the CMS Collaboration has published identified particle transverse momentum spectra in high multiplicity events at LHC energies $\sqrt s $ = 0.9-13 TeV. In the present work the transverse momentum spectra have been analyzed in the…

High Energy Physics - Phenomenology · Physics 2020-01-01 A. S. Hirsch , C. Pajares , R. P. Scharenberg , B. K. Srivastava

The observed limiting fragmentation of charged particle distributions in heavy ion collisions is difficult to explain as it does not apply to the proton spectrum itself. On the other hand, string percolation provides a mechanism to…

High Energy Physics - Phenomenology · Physics 2008-11-26 P. Brogueira , J. Dias de Deus , C. Pajares

The transverse momentum spectra and their multiplicity dependence serve as key tools for extracting parameters to be compared with theoretical models. Over the past decade, the scientific community has extensively studied the possibility of…

High Energy Physics - Phenomenology · Physics 2025-06-23 Gábor Bíró , Leonid Serkin , Guy Paić , Gergely Gábor Barnaföldi

The centrality dependence of transverse momentum spectra for identified hadrons at midrapidity in Au+Au collisions at $\sqrt{s_{NN}}= 200$ GeV is systematically studied in a quark combination model. The $\mathrm{{p}_{T}}$ spectra of…

High Energy Physics - Phenomenology · Physics 2015-05-13 Yun-fei Wang , Feng-lan Shao , Jun Song , De-ming Wei , Qu-bing Xie

With the experimental data from STAR, PHENIX and BRAHMS on the centrality and rapidity dependence of the $p_T$ spectrum in Au+Au and d+Au collisions, we show that there exists a scaling distribution which is independent of the colliding…

Nuclear Theory · Physics 2008-11-26 L. L. Zhu , C. B. Yang