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Measurement of the Polarization of W Bosons with Large Transverse Momenta in W+jets Events at the LHC

Author(s)
Alver, Burak Han; Bendavid, Joshua L.; Busza, Wit; Butz, Erik M.; Cali, Ivan Amos; Chan, M.; Dutta, Valentina; Everaerts, Pieter Bruno Bart; Gomez-Ceballos, Guillelmo; Goncharov, Maxim; Hahn, Kristian Allan; Kim, Y.; Klute, Markus; Li, W.; Ma, Teng; Nahn, Steven; Paus, Christoph M. E.; Ralph, Duncan Kelley; Stephans, George S. F.; Sung, Kevin Kai Hong; Wenger, Edward Allen; Xie, Si; Yilmaz, Yetkin; Zanetti, Marco; Wyslouch, Boleslaw; Luckey Jr, P David; Roland, Gunther M; Sumorok, Konstanty C; Yang, Mingming; Yoon, A. S.; Bauer, Gerry P; Lee, Yen-Jie; Loizides, Constantinos; Roland, Christof E; Rudolph, Matthew Scott; Stoeckli, Fabian; Harris, Philip Coleman; ... Show more Show less
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Abstract
A first measurement of the polarization of W bosons with large transverse momenta in pp collisions is presented. The measurement is based on 36  pb[superscript -1] of data recorded at √s=7  TeV by the CMS detector at the LHC. The left-handed, right-handed, and longitudinal polarization fractions (f[subscript L], f[subscript R], and f[subscript 0], respectively) of W bosons with transverse momenta larger than 50 GeV are determined by using decays to both electrons and muons. The muon final state yields the most precise measurement: (f[subscript L]-f[subscript R])-=0.240±0.036(stat)±0.031(syst) and f[subscript 0][superscript -]=0.183±0.087(stat)±0.123(syst) for negatively charged W bosons and (f[subscript L]-f[subscript R])[superscript +]=0.310±0.036(stat)±0.017(syst) and f[subscript 0][superscript +]=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.
Date issued
2011-07
URI
http://hdl.handle.net/1721.1/67062
Department
Massachusetts Institute of Technology. Department of Physics; Massachusetts Institute of Technology. Laboratory for Nuclear Science
Journal
Physical Review Letters
Publisher
American Physical Society
Citation
Chatrchyan, S. et al.(CMS Collaboration. "Measurement of the Polarization of W Bosons with Large Transverse Momenta in W+jets Events at the LHC." Phys. Rev. Lett. 107, 021802 (2011) © 2011 American Physical Society
Version: Final published version
ISSN
0031-9007

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