Measurement of the W→eν and Z/γ*→e[superscript +]e[superscript -] production cross sections at mid-rapidity in proton-proton collisions at √s=500 GeV
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Adamczyk-2012-production cross sections at mid-rapidity in proton-proton collisions.pdf
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Author(s)
Balewski, Jan T.
Betancourt, Michael Joseph
Corliss, Ross Cameron
Hays-Wehle, James Prewitt
Leight, William Axel
Surrow, Bernd
Redwine, Robert P
Seele, Joseph Patrick
Steadman, Stephen G
van Nieuwenhuizen, Gerrit J
Date Issued
May 2012
Journal
Physical Review D
Publisher
American Physical Society
Citation
L. Adamczyk et al. (STAR Collaboration). "Measurement of the W→eν and Z/γ*→e[superscript +]e[superscript -] production cross sections at mid-rapidity in proton-proton collisions at √s=500 GeV" Physical Review D 85, 092010 (2012). © 2012 American Physical Society
Version
Final published version
Abstract
We report measurements of the charge-separated W[superscript +(-)]→e[superscript +(-)]+ν[subscript e](ν̅ [subscript e]) and Z/γ[superscript *]→e[superscript +]e[superscript -] production cross sections at mid-rapidity in proton-proton collisions at √s=500 GeV. These results are based on 13.2 pb[superscript -1] 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(pp→W[superscript +]X)·BR(W[superscript +]→e[superscript +]ν[subscript e])=117.3±5.9(stat)±6.2(syst)±15.2(lumi) pb, and σ(pp→W[superscript -]X)·BR(W[superscript -]→e[superscript -]ν̅ [subscript e])=43.3±4.6(stat)± 3.4(syst)±5.6(lumi) pb. For Z/γ[superscript *] production, σ(pp→Z/γ[superscript *]X)·BR(Z/γ[superscript *]→e[superscript +]e[superscript -])=7.7±2.1(stat)[subscript -0.9][superscript +0.5](syst)±1.0(lumi) pb was measured for di-lepton invariant masses m[subscript e]+[subscript e]- between 70 and 110 GeV/c[superscript 2]. First measurements of the W cross section ratio, σ(pp→W[superscript +]X)/σ(pp→W[superscript -]X), at √s=500 GeV are also reported. Theoretical predictions, calculated using recent parton distribution functions, are found to agree with the measured cross sections.
MIT Department
Massachusetts Institute of Technology. Department of Physics
Massachusetts Institute of Technology. Laboratory for Nuclear Science
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DOI of Published Version
https://doi.org/10.1103/PhysRevD.85.092010
