Measurement of the W -> e nu and Z/gamma* -> e(+)e(-) Production Cross Sections at Mid-rapidity in Proton-Proton Collisions at root s = 500 GeV

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Adamczyk, L. - Agakishiev, G. - Barnovská, Zuzana - Bielčík, J. - Bielčíková, Jana - Chaloupka, P. - Chung, Paul - Kapitán, Jan - Hajková, O. - Pachr, M. - Rusňák, Jan - Šumbera, Michal - Tlustý, David … celkem 363 autorů
Measurement of the W -> e nu and Z/gamma* -> e(+)e(-) Production Cross Sections at Mid-rapidity in Proton-Proton Collisions at root s = 500 GeV.
Physical Review D. Roč. 85, č. 9 (2012), č. článku 092010. ISSN 2470-0010. E-ISSN 2470-0029
Grant CEP: GA MŠMT LA09013
Institucionální podpora: RVO:61389005
Klíčová slova: leptonic decay * RHIC * quantum chromodynamics
Obor OECD: Particles and field physics
Impakt faktor: 4.691, rok: 2012

We report measurements of the charge-separated W+(-)-> e(+(-))+nu(e)(nu-(e)) and Z/gamma*-> e(+)e(-) production cross sections at mid-rapidity in proton-proton collisions at root s=500 GeV. These results are based on 13.2 pb(-1) of data recorded in 2009 by the STAR detector at RHIC. Production cross sections for W bosons that decay via the e nu channel were measured to be sigma(pp -> W+X)center dot BR(W+-> e(+)nu e)=117.3 +/- 5.9(stat)+/- 6.2(syst)+/- 15.2(lumi) pb, and sigma(pp -> W-X)center dot BR(W--> e(-)(nu)over bar(-)e)=43.3 +/- 4.6(stat)+/- 3.4(syst)+/- 5.6(lumi) pb. For Z/gamma* production, sigma(pp -> Z/gamma*X)center dot BR(Z/gamma*-> e(+)e(-))=7.7 +/- 2.1(stat)-0.9+0.5(syst)+/- 1.0(lumi) pb was measured for di-lepton invariant masses m(e+e-) between 70 and 110 GeV/c(2). First measurements of the W cross section ratio, sigma(pp -> W+X)/sigma(pp -> W-X), at root v=500 GeV are also reported. Theoretical predictions, calculated using recent parton distribution functions, are found to agree with the measured cross sections.
Trvalý link: http://hdl.handle.net/11104/0281246