Journal
PHYSICAL REVIEW LETTERS
Volume 112, Issue 3, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.112.032302
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Funding
- Office of NP U.S. DOE Office of Science
- U.S. NSF
- CNRS/IN2P3
- FAPESP CNPq of Brazil
- Ministry of Education and Science of the Russian Federation
- NNSFC
- CAS
- MoST
- MoE of China
- Korean Research Foundation
- GA and MSMT of the Czech Republic
- FIAS of Germany
- DAE
- DST
- CSIR of the Government of India
- National Science Centre of Poland
- National Research Foundation [NRF-2012004024]
- Ministry of Science, Education and Sports of the Republic of Croatia
- RosAtom of Russia
- Renaissance Technologies Corporation
- DST Swarna Jayanti Fellowship
- Office of HEP within the U.S. DOE Office of Science
- Direct For Mathematical & Physical Scien
- Division Of Physics [1067907] Funding Source: National Science Foundation
- Grants-in-Aid for Scientific Research [25105504] Funding Source: KAKEN
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We report the beam energy (root S-NN = 7.7-200 GeV) and collision centrality dependence of the mean (M), standard deviation (sigma), skewness (S), and kurtosis (kappa) of the net-proton multiplicity distributions in Au + Au collisions. The measurements are carried out by the STAR experiment at midrapidity (vertical bar y vertical bar < 0.5) and within the transverse momentum range 0.4 < p(T) < 0.8 GeV/c in the first phase of the Beam Energy Scan program at the Relativistic Heavy Ion Collider. These measurements are important for understanding the quantum chromodynamic phase diagram. The products of the moments, S sigma and K sigma(2), are sensitive to the correlation length of the hot and dense medium created in the collisions and are related to the ratios of baryon number susceptibilities of corresponding orders. The products of moments are found to have values significantly below the Skellam expectation and close to expectations based on independent proton and antiproton production. The measurements are compared to a transport model calculation to understand the effect of acceptance and baryon number conservation and also to a hadron resonance gas model.
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