Eur. Phys. J. A (2014) 50: 62
https://doi.org/10.1140/epja/i2014-14062-5

Regular Article - Theoretical Physics

Extracting chemical potentials of quarks from ratios of negatively/positively charged particles in high-energy collisions

Institute of Theoretical Physics, Shanxi University, 030006, Taiyuan, China

^* e-mail: fuhuliu@163.com

Received: 5 February 2014
Revised: 6 March 2014
Accepted: 7 March 2014
Published online: 26 March 2014

Abstract

The transverse momentum spectrums of π ⁻, π ⁺, K ⁻, K ⁺, , and p produced in p-Pb collisions at TeV measured by the CMS Collaboration and in Pb-Pb collisions at TeV measured by the ALICE Collaboration are described by the Tsallis distribution. Then, the ratios of negatively/positively charged particles are obtained. The chemical potentials of u-quark, d-quark, s-quark, baryon number, isospin, and strangeness are obtained by using different configurations of the ratios. Comparing with the masses of final-state particles, all the six types of chemical potentials are small.