Measurement of Bottom Versus Charm as a Function of Transverse Momentum with Electron-Hadron Correlations in p+p Collisions at s=200GeV

A. Adare et al. (PHENIX Collaboration)
Phys. Rev. Lett. 103, 082002 – Published 18 August 2009

Abstract

The momentum distribution of electrons from semileptonic decays of charm and bottom quarks for midrapidity |y|<0.35 in p+p collisions at s=200GeV is measured by the PHENIX experiment at the Relativistic Heavy Ion Collider over the transverse momentum range 2<pT<7GeV/c. The ratio of the yield of electrons from bottom to that from charm is presented. The ratio is determined using partial D/D¯e±KX (K unidentified) reconstruction. It is found that the yield of electrons from bottom becomes significant above 4GeV/c in pT. A fixed-order-plus-next-to-leading-log perturbative quantum chromodynamics calculation agrees with the data within the theoretical and experimental uncertainties. The extracted total bottom production cross section at this energy is σbb¯=3.21.1+1.2(stat)1.3+1.4(syst)μb.

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  • Received 29 March 2009

DOI:https://doi.org/10.1103/PhysRevLett.103.082002

©2009 American Physical Society

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Vol. 103, Iss. 8 — 21 August 2009

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