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

Autori
Adamczyk, L. ; ... ; Planinić, Mirko ; ... ; Poljak, Nikola ; ... ; Zoulkarneeva, Y.

Izvornik
Physical Review D - Particles, Fields, Gravitation, and Cosmology (1550-7998) 85 (2012); 092010-1

Vrsta, podvrsta i kategorija rada
Radovi u časopisima, članak, znanstveni

Ključne riječi
electron; production; mid-rapidity; STAR

Sažetak
We report measurements of the charge-separated W+(-)→e+(- )+νe(ν̅ e) and Z/γ*→e+e- production cross sections at mid-rapidity in proton-proton collisions at √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 eν channel were measured to be σ(pp→W+X)·BR(W+→e+νe)=117.3±5.9(stat)±6.2(syst)±15.2(lumi)   pb, and σ(pp→W-X)·BR(W-→e-ν̅ e)=43.3±4.6(stat)± 3.4(syst) ±5.6(lumi)  pb. For Z/γ* production, σ(pp→Z/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 110  GeV/c2. First measurements of the W cross section ratio, σ(pp→W+X)/σ(pp→W- 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.

Izvorni jezik
Engleski

Znanstvena područja
Fizika

Napomena
STAR Collaboration.

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