STAR Collaboration2015-05-152015-05-152012STAR Collaboration. "Measurement of the W→eν and Z/γ∗→e+e− production cross sections at mid-rapidity in proton-proton collisions at √s=500  GeV." <i>Physical Review D,</i> 85, no. 9 (2012) American Physical Society: 92010. http://dx.doi.org/10.1103/PhysRevD.85.092010.https://hdl.handle.net/1911/80227We 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√=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−ν¯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)+0.5−0.9(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.engArticle is made available in accordance with the publisher's policy and may be subject to US copyright law. Please refer to the publisher's site for terms of use.Journal articlehttp://dx.doi.org/10.1103/PhysRevD.85.092010