Measurement of charm and bottom production in p+p collisions at $\sqrt{s}$ = 200 GeV at RHIC-PHENIX

TL;DR

This paper reports measurements of charm and bottom quark production in proton-proton collisions at 200 GeV, providing insights into heavy quark behavior in hot dense media like those created in heavy-ion collisions.

Contribution

It presents the first experimental determination of the charm-to-bottom production ratio and total bottom cross section in p+p collisions at RHIC energies.

Findings

Measured charm over bottom ratio in p+p collisions.

Determined total bottom cross section at 200 GeV.

Provided baseline data for heavy-ion collision studies.

Abstract

RHIC-PHENIX has observed a large suppression pattern and azimuthal anisotropy of non-photonic electron at mid-rapidity ($\mid\eta\mid<0.35$) in Au+Au collisions at $\sqrt{s_{NN}} = 200$ GeV. To understand these results and the interaction of heavy quarks in the hot and dense medium, experimental determination of production ratio of charm over bottom is one of the most important topics, since the behavior of bottom may differ from charm in the medium. We measured the ratio of charm over bottom and total cross section of bottom via partial reconstruction of D$^0$$\to$e$^+$ K$^-$ $\nu_e$ decay in p+p collisions at $\sqrt{s} = 200$ GeV. Total cross sections of charm and bottom were also measured via di-electron continuum in p+p collisions at $\sqrt{s} = 200$ GeV.