Particle multiplicities in the central region of high-energy collisions from $k_T$-factorization with running coupling corrections

Dumitru, Adrian; Giannini, Andre V.; Luzum, Matthew; Nara, Yasushi

doi:10.1016/j.physletb.2018.08.028

Title: Particle multiplicities in the central region of high-energy collisions from $$k_T$$-factorization with running coupling corrections

Abstract

Horowitz and Kovchegov have derived a $$k_T$$-factorization formula for particle production at small x which includes running coupling corrections. We perform a first numerical analysis to confront the theory with data on the energy and centrality dependence of particle multiplicities at midrapidity in high-energy p+A (and A+A) collisions. Moreover, we point out a strikingly different dependence of the multiplicity per participant on $$N$$_part in p+Pb vs. Pb+Pb collisions at LHC energies, and argue that the observed behavior follows rather naturally from the convolution of the gluon distributions of an asymmetric vs. symmetric projectile and target.

Authors:

Dumitru, Adrian;

;

Publication Date:: Thu Aug 23 00:00:00 EDT 2018

Research Org.:: City Univ. of New York (CUNY), NY (United States). Baruch College

Sponsoring Org.:: USDOE Office of Science (SC), Nuclear Physics (NP); Fundação de Amparo a Pesquisa do Estado de São Paulo (FAPESP)

OSTI Identifier:: 1466057

Alternate Identifier(s):: OSTI ID: 1660450

Grant/Contract Number:: FG02-09ER41620; SC0002307; 60262-0048; 17/14974-8

Resource Type:: Published Article

Journal Name:: Physics Letters. B

Additional Journal Information:: Journal Name: Physics Letters. B Journal Volume: 784 Journal Issue: C; Journal ID: ISSN 0370-2693

Publisher:: Elsevier

Country of Publication:: Netherlands

Language:: English

Subject:: 72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; Particle production; Color Glass Condensate; kT-Factorization; Heavy-ion collisions; Proton nucleus collisions

Citation Formats


                    Dumitru, Adrian, Giannini, Andre V., Luzum, Matthew, and Nara, Yasushi. Particle multiplicities in the central region of high-energy collisions from $k_T$-factorization with running coupling corrections.  Netherlands: N. p., 2018. 
Web.  doi:10.1016/j.physletb.2018.08.028.

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                    Dumitru, Adrian, Giannini, Andre V., Luzum, Matthew, & Nara, Yasushi. Particle multiplicities in the central region of high-energy collisions from $k_T$-factorization with running coupling corrections.  Netherlands.  https://doi.org/10.1016/j.physletb.2018.08.028

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                    Dumitru, Adrian, Giannini, Andre V., Luzum, Matthew, and Nara, Yasushi. Thu .  
"Particle multiplicities in the central region of high-energy collisions from $k_T$-factorization with running coupling corrections".  Netherlands.  https://doi.org/10.1016/j.physletb.2018.08.028.

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@article{osti_1466057,

  title        = {Particle multiplicities in the central region of high-energy collisions from $k_T$-factorization with running coupling corrections},

  author       = {Dumitru, Adrian and Giannini, Andre V. and Luzum, Matthew and Nara, Yasushi},

  abstractNote = {Horowitz and Kovchegov have derived a $k_T$-factorization formula for particle production at small x which includes running coupling corrections. We perform a first numerical analysis to confront the theory with data on the energy and centrality dependence of particle multiplicities at midrapidity in high-energy p+A (and A+A) collisions. Moreover, we point out a strikingly different dependence of the multiplicity per participant on $N$part in p+Pb vs. Pb+Pb collisions at LHC energies, and argue that the observed behavior follows rather naturally from the convolution of the gluon distributions of an asymmetric vs. symmetric projectile and target.},

  doi          = {10.1016/j.physletb.2018.08.028},

  journal      = {Physics Letters. B},

  number       = C,

  volume       = 784,

  place        = {Netherlands},

  year         = {Thu Aug 23 00:00:00 EDT 2018},

  month        = {Thu Aug 23 00:00:00 EDT 2018}

}

Copy to clipboard

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Title: Particle multiplicities in the central region of high-energy collisions from $$k_T$$-factorization with running coupling corrections

Abstract

Citation Formats

Collinear singularities and running coupling corrections to gluon production in CGC journal, July 2008

Quark contribution to the small- x evolution of color dipole journal, January 2007

Running coupling and power corrections in non-linear evolution at the high-energy limit journal, March 2007

Scaling of transverse energies and multiplicities with atomic number and energy in ultrarelativistic nuclear collisions journal, March 2000

Running coupling corrections to high energy inclusive gluon production journal, January 2011

Nonlinear QCD meets data: A global analysis of lepton-proton scattering with running coupling Balitsky-Kovchegov evolution journal, August 2009

Transverse energy evolution as a test of parton cascade models journal, December 1997

Color glass condensate at the LHC: hadron multiplicities in pp, pA and AA collisions journal, January 2005

Saturation models of HERA DIS data and inclusive hadron distributions in collisions at the LHC journal, January 2011

Semihard processes in QCD journal, November 1983

On the gluon spectrum in the glasma journal, November 2010

Triumvirate of running couplings in small-x evolution journal, March 2007

Average transverse momentum of hadrons in proton–nucleus collisions in the wounded nucleon model journal, October 2013

Parton saturation at small x and in large nuclei journal, October 1999

Hadron production in nuclear collisions at RHIC and high-density QCD journal, May 2001

Charged particle densities from Au+Au collisions at sNN=130 GeV journal, December 2001

CGC predictions for p+Pb collisions at the LHC journal, January 2013

Next-to-leading order evolution of color dipoles journal, January 2008

The small-x gluon distribution in centrality biased pA and pp collisions journal, June 2018

AAMQS: A non-linear QCD analysis of new HERA data at small-x including heavy quarks journal, July 2011

Quark-gluon-plasma evolution in scaling hydrodynamics journal, February 1984

Pseudorapidity Distribution of Charged Particles in d + A u Collisions at s N N = 200 G e V journal, August 2004

QCD saturation at the LHC: Comparisons of models to p+p and A+A data and predictions for p+Pb collisions journal, March 2012

Measurement of the centrality dependence of the charged-particle pseudorapidity distribution in proton–lead collisions at $$\sqrt{s_{_\text {NN}}} = 5.02$$ s NN = 5.02 TeV with the ATLAS detector journal, April 2016

Pseudorapidity Density of Charged Particles in p + Pb Collisions at s N N = 5.02 TeV journal, January 2013

Proton–nucleus scattering and cross section fluctuations at RHIC and LHC journal, February 2006

Centrality Dependence of the Charged-Particle Multiplicity Density at Midrapidity in Pb-Pb Collisions at s NN = 2.76 TeV journal, January 2011

Energy and Centrality Dependence of Rapidity Densities at RHIC Energies journal, April 2001

QCD saturation and deuteron–nucleus collisions journal, January 2004

Centrality dependence of particle production in p − Pb collisions at s NN = 5.02 TeV journal, June 2015

The effective pressure of a saturated gluon plasma journal, November 2000

On solutions of the Balitsky–Kovchegov equation with impact parameter journal, September 2003

Manifestations of high density QCD in the first RHIC data journal, December 2001

Collinear singularities and running coupling corrections to gluon production in CGC
journal, July 2008

Quark contribution to the small- $x$ evolution of color dipole
journal, January 2007

Running coupling and power corrections in non-linear evolution at the high-energy limit
journal, March 2007

Scaling of transverse energies and multiplicities with atomic number and energy in ultrarelativistic nuclear collisions
journal, March 2000

Running coupling corrections to high energy inclusive gluon production
journal, January 2011

Nonlinear QCD meets data: A global analysis of lepton-proton scattering with running coupling Balitsky-Kovchegov evolution
journal, August 2009

Transverse energy evolution as a test of parton cascade models
journal, December 1997

Color glass condensate at the LHC: hadron multiplicities in pp, pA and AA collisions
journal, January 2005

Saturation models of HERA DIS data and inclusive hadron distributions in collisions at the LHC
journal, January 2011

Semihard processes in QCD
journal, November 1983

On the gluon spectrum in the glasma
journal, November 2010

Triumvirate of running couplings in small-x evolution
journal, March 2007

Average transverse momentum of hadrons in proton–nucleus collisions in the wounded nucleon model
journal, October 2013

Parton saturation at small x and in large nuclei
journal, October 1999

Hadron production in nuclear collisions at RHIC and high-density QCD
journal, May 2001

Charged particle densities from Au+Au collisions at sNN=130 GeV
journal, December 2001

CGC predictions for p+Pb collisions at the LHC
journal, January 2013

Next-to-leading order evolution of color dipoles
journal, January 2008

The small-x gluon distribution in centrality biased pA and pp collisions
journal, June 2018

AAMQS: A non-linear QCD analysis of new HERA data at small-x including heavy quarks
journal, July 2011

Quark-gluon-plasma evolution in scaling hydrodynamics
journal, February 1984

Pseudorapidity Distribution of Charged Particles in $d + A u$ Collisions at $\sqrt{s_{N N}} = 200 G e V$
journal, August 2004

QCD saturation at the LHC: Comparisons of models to p+p and A+A data and predictions for p+Pb collisions
journal, March 2012

Measurement of the centrality dependence of the charged-particle pseudorapidity distribution in proton–lead collisions at $$\sqrt{s_{_\text {NN}}} = 5.02$$ s NN = 5.02 TeV with the ATLAS detector
journal, April 2016

Pseudorapidity Density of Charged Particles in $p + Pb$ Collisions at $\sqrt{s_{N N}} = 5.02 TeV$
journal, January 2013

Proton–nucleus scattering and cross section fluctuations at RHIC and LHC
journal, February 2006

Centrality Dependence of the Charged-Particle Multiplicity Density at Midrapidity in Pb-Pb Collisions at $\sqrt{s_{NN}} = 2.76 TeV$
journal, January 2011

Energy and Centrality Dependence of Rapidity Densities at RHIC Energies
journal, April 2001

QCD saturation and deuteron–nucleus collisions
journal, January 2004

Centrality dependence of particle production in $p - Pb$ collisions at $\sqrt{s_{NN}} = 5.02 TeV$
journal, June 2015

The effective pressure of a saturated gluon plasma
journal, November 2000

On solutions of the Balitsky–Kovchegov equation with impact parameter
journal, September 2003

Manifestations of high density QCD in the first RHIC data
journal, December 2001