The measurement of non-photonic electrons in STAR

TL;DR

This paper reports on measurements of non-photonic electron spectra and correlations in proton-proton and gold-gold collisions at RHIC energies, providing insights into heavy quark production and decay contributions.

Contribution

It presents new measurements of NPE spectra and B decay contributions in p+p collisions at 200 and 500 GeV, and preliminary results in Au+Au collisions, aiding interpretation of heavy quark dynamics.

Findings

B decay contribution is comparable to D at high pT in p+p at 200 GeV.

B decay contribution is about 60% at high pT in p+p at 500 GeV.

NPE spectra agree with FONLL pQCD calculations.

Abstract

The measurements of non-photonic electrons (NPE), mainly produced by semileptonic decays of D and B mesons, provide information on heavy quarks production as well as properties of nuclear matter produced in heavy ion collisons. In order to interpret the NPE measurements it is important to determine the relative charm and bottom contribution to the NPE spectrum. In this proceedings we present the measurements of NPE spectra and NPE-hadron azimuthal correlations in p+p collisions at $\sqrt{s}$=200 GeV and at $\sqrt{s}$=500 GeV. NPE-hadron correlations allow extraction of the B decay contribution to the NPE. The B decay contribution is comparable to the contribution from the D meson decay at $\sqrt{s}$=200 GeV at p$_T$ higher than 5 GeV/c, and is about 60% at $\sqrt{s}$=500 GeV at p$_T$ higher than 5 GeV/c. STAR measured NPE spectrum in p+p collisions as well as relative constribution of bottom decays to the spectrum is consistent with FONLL pQCD calculations. The preliminary results of NPE spectra and NPE-hadron correlations in Au+Au collisions at $\sqrt{s}$=200 GeV is shown.