Measurement of the Polarization of W Bosons with Large Transverse Momenta in W+jets Events at the LHC
Name
Paus-2011-Measurement of the Polarization.pdf
Size
369.8 KB
Format
Adobe PDF
Checksum (MD5)
5c95a952698b93978cd72785b414c6d3
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
Date Issued
July 2011
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
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.
MIT Department
Massachusetts Institute of Technology. Department of Physics
Massachusetts Institute of Technology. Laboratory for Nuclear Science
Terms of Use
Article 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.
Persistent DSpace Link
DOI of Published Version
https://doi.org/10.1103/PhysRevLett.107.021802
