Understanding the p/π ratio at LHC due to QCD mass spectrum

Jacquelyn Noronha-Hostler; Carsten Greiner

doi:10.1016/j.nuclphysa.2014.08.101

Understanding the p/π ratio at LHC due to QCD mass spectrum

Jacquelyn Noronha-Hostler
, Carsten Greiner

Research output: Contribution to journal › Article › peer-review

Abstract

Thermal fits have consistently reproduced the experimental particle yields of heavy ion collisions, however, the proton to pion ratio from ALICE Pb. +. Pb sNN=2.76 TeV is over-predicted by thermal models - known as the p/π puzzle. Here we test the relevance of the extended mass spectrum, i.e., include Hagedorn states (resonances that follow an exponential mass spectrum and have very short life times) on the p/π puzzle. We find that the extended mass spectrum is able to reproduce particle ratios at both RHIC and the LHC as well as is able to match the lower p/π ratio at the LHC through dynamical chemical equilibration.

Original language	English (US)
Pages (from-to)	1108-1113
Number of pages	6
Journal	Nuclear Physics A
Volume	931
DOIs	https://doi.org/10.1016/j.nuclphysa.2014.08.101
State	Published - Nov 1 2014
Externally published	Yes

Keywords

Dynamical hadronic interactions
Extended mass spectrum
Hadron resonance gas
Hagedorn states
Relativistic heavy-ion collisions
Thermal fits

ASJC Scopus subject areas

Nuclear and High Energy Physics

Online availability

10.1016/j.nuclphysa.2014.08.101

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title = "Understanding the p/π ratio at LHC due to QCD mass spectrum",

abstract = "Thermal fits have consistently reproduced the experimental particle yields of heavy ion collisions, however, the proton to pion ratio from ALICE Pb. +. Pb sNN=2.76 TeV is over-predicted by thermal models - known as the p/π puzzle. Here we test the relevance of the extended mass spectrum, i.e., include Hagedorn states (resonances that follow an exponential mass spectrum and have very short life times) on the p/π puzzle. We find that the extended mass spectrum is able to reproduce particle ratios at both RHIC and the LHC as well as is able to match the lower p/π ratio at the LHC through dynamical chemical equilibration.",

keywords = "Dynamical hadronic interactions, Extended mass spectrum, Hadron resonance gas, Hagedorn states, Relativistic heavy-ion collisions, Thermal fits",

author = "Jacquelyn Noronha-Hostler and Carsten Greiner",

note = "J. Noronha-Hostler acknowledges Funda{\c c}{\~a}o de Amparo {\`a} Pesquisa do Estado de S{\~a}o Paulo ( FAPESP 2011/08361-7 ) for financial support. This work was supported by the Bundesministerium f{\"u}r Bildung und Forschung ( BMBF ), HGS-HIRe and the Helmholtz International Center for FAIR within the framework of the LOEWE program launched by the State of Hesse.",

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doi = "10.1016/j.nuclphysa.2014.08.101",

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AU - Noronha-Hostler, Jacquelyn

AU - Greiner, Carsten

N1 - J. Noronha-Hostler acknowledges Fundação de Amparo à Pesquisa do Estado de São Paulo ( FAPESP 2011/08361-7 ) for financial support. This work was supported by the Bundesministerium für Bildung und Forschung ( BMBF ), HGS-HIRe and the Helmholtz International Center for FAIR within the framework of the LOEWE program launched by the State of Hesse.

PY - 2014/11/1

Y1 - 2014/11/1

N2 - Thermal fits have consistently reproduced the experimental particle yields of heavy ion collisions, however, the proton to pion ratio from ALICE Pb. +. Pb sNN=2.76 TeV is over-predicted by thermal models - known as the p/π puzzle. Here we test the relevance of the extended mass spectrum, i.e., include Hagedorn states (resonances that follow an exponential mass spectrum and have very short life times) on the p/π puzzle. We find that the extended mass spectrum is able to reproduce particle ratios at both RHIC and the LHC as well as is able to match the lower p/π ratio at the LHC through dynamical chemical equilibration.

AB - Thermal fits have consistently reproduced the experimental particle yields of heavy ion collisions, however, the proton to pion ratio from ALICE Pb. +. Pb sNN=2.76 TeV is over-predicted by thermal models - known as the p/π puzzle. Here we test the relevance of the extended mass spectrum, i.e., include Hagedorn states (resonances that follow an exponential mass spectrum and have very short life times) on the p/π puzzle. We find that the extended mass spectrum is able to reproduce particle ratios at both RHIC and the LHC as well as is able to match the lower p/π ratio at the LHC through dynamical chemical equilibration.

KW - Dynamical hadronic interactions

KW - Extended mass spectrum

KW - Hadron resonance gas

KW - Hagedorn states

KW - Relativistic heavy-ion collisions

KW - Thermal fits

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VL - 931

SP - 1108

EP - 1113

JO - Nuclear Physics A

JF - Nuclear Physics A

ER -

Understanding the p/π ratio at LHC due to QCD mass spectrum

Abstract

Keywords

ASJC Scopus subject areas

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