Title
Measurement of the polarization of W bosons with large transverse momenta in W + jets events at the LHC Measurement of the polarization of W bosons with large transverse momenta in W + jets events at the LHC
Author
Faculty/Department
Faculty of Sciences. Physics
Publication type
article
Publication
New York, N.Y. ,
Subject
Physics
Source (journal)
Physical review letters. - New York, N.Y.
Volume/pages
107(2011) :2 , p. 1-15
ISSN
0031-9007
ISI
000292516600006
Carrier
E-only publicatie
Target language
English (eng)
Full text (Publishers DOI)
Affiliation
University of Antwerp
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-1 of data recorded at √s=7  TeV by the CMS detector at the LHC. The left-handed, right-handed, and longitudinal polarization fractions (fL, fR, and f0, 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: (fL-fR)-=0.240±0.036(stat)±0.031(syst) and f0-=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 f0+=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.
Full text (open access)
https://repository.uantwerpen.be/docman/irua/d3e065/5c95a952.pdf
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