“School of Particles%20And%20Accelerator”
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| Paper IPM / Particles%20And%20Accelerator / 11881 |
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A first measurement of the polarization of W bosons with large transverse momenta in pp collisions is presented. The measurement is based on 36 pb1 of data recorded at sqrt(s)
= 7 TeV by the CMS detector at the LHC. The left-handed, righthanded and longitudinal polarization fractions ( fL, fR, f0) of W bosons with transverse momenta larger than 50 GeV are determined using decays to both electrons
and muons. The muon final state yields the most precise measurement, ( fL - fR)=0.240 0.036 (stat.) 0.031 (syst.) and f 0 = 0.183 0.087 (stat.) 0.123 (syst.) for negatively charged W bosons, and ( fL - fR)+ = 0.310 0.036 (stat.) 0.017 (syst.) and f+0 = 0.171 0.085 (stat.) 0.099 (syst.) for positively charged W bosons. This establishes, for the first time, that W bosons produced in pp collisions with large transverse momenta are predominantly left-handed, as expected in the standard model
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