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High transverse momentum identified particle spectra in 200 GeV collisions from STAR

Olga Barannikova
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Abstract

Significant baryon over meson enhancement was measured at RHIC in the intermediate transverse momentum range of $p_T=2-4$ GeV/$c$ ("baryon-meson puzzle"). With STAR detector we were able to extend particle identification towards higher transverse momentum offering further insights into the particle production mechanisms at intermediate to high $p_T$. In this paper we present results on charged pion, proton and anti-proton spectra and ratios at intermediate to high $p_T$ exploiting the relativistic rise of the specific ionization energy loss measured in the STAR Time Projection Chamber. These measurements provide valuable information about the production mechanisms of particles at intermediate $p_T$ in relativistic heavy ion collisions, e.g. coalescence/recombination versus jet fragmentation.

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Olga Barannikova. 2005-05-20. High transverse momentum identified particle spectra in 200 GeV collisions from STAR. https://doi.org/10.1556/aph.25.2006.2-4.21

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