Measurement of the Weν and Z/γ*e+e production cross sections at mid-rapidity in proton-proton collisions at s=500GeV

L. Adamczyk et al. (STAR Collaboration)
Phys. Rev. D 85, 092010 – Published 16 May 2012

Abstract

We report measurements of the charge-separated W+()e+()+νe(ν¯e) and Z/γ*e+e production cross sections at mid-rapidity in proton-proton collisions at s=500GeV. These results are based on 13.2pb1 of data recorded in 2009 by the STAR detector at RHIC. Production cross sections for W bosons that decay via the eν channel were measured to be σ(ppW+X)·BR(W+e+νe)=117.3±5.9(stat)±6.2(syst)±15.2(lumi)pb, and σ(ppWX)·BR(Weν¯e)=43.3±4.6(stat)±3.4(syst)±5.6(lumi)pb. For Z/γ* production, σ(ppZ/γ*X)·BR(Z/γ*e+e)=7.7±2.1(stat)0.9+0.5(syst)±1.0(lumi)pb was measured for di-lepton invariant masses me+e between 70 and 110GeV/c2. First measurements of the W cross section ratio, σ(ppW+X)/σ(ppWX), at s=500GeV are also reported. Theoretical predictions, calculated using recent parton distribution functions, are found to agree with the measured cross sections.

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  • Received 13 December 2011

DOI:https://doi.org/10.1103/PhysRevD.85.092010

© 2012 American Physical Society

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Vol. 85, Iss. 9 — 1 May 2012

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