Measurement of the polarisation of W bosons produced with large transverse momentum in pp collisions at root s=7 TeV with the ATLAS experiment
This paper describes an analysis of the angular distribution of W {yields} e{nu} and W {yields} {mu}{nu} decays, using data from pp collisions at {radical}s = 7 TeV recorded with the ATLAS detector at the LHC in 2010, corresponding to an integrated luminosity of about 35 pb{sup -1}. Using the decay lepton transverse momentum and the missing transverse momentum, the W decay angular distribution projected onto the transverse plane is obtained and analysed in terms of helicity fractions f{sub 0}, f{sub L} and f{sub R} over two ranges of W transverse momentum (p{sub T}{sup W}): 35 < p{sub T}{sup W} < 50 GeV and p{sub T}{sup W} > 50 GeV. Good agreement is found with theoretical predictions. For p{sub T}{sup W} > 50 GeV, the values of f{sub 0} and f{sub L}-f{sub R}, averaged over charge and lepton flavour, are measured to be: f{sub 0} = 0.127 {+-} 0.030 {+-} 0.108 and f{sub L} - f{sub R} = 0.252 {+-} 0.017 {+-} 0.030, where the first uncertainties are statistical, and the second include all systematic effects.
- Research Organization:
- Brookhaven National Lab. (BNL), Upton, NY (United States)
- Sponsoring Organization:
- USDOE SC OFFICE OF SCIENCE (SC)
- DOE Contract Number:
- DE-AC02-98CH10886
- OSTI ID:
- 1048773
- Report Number(s):
- BNL-98364-2012-JA; KA1101023; TRN: US1204295
- Journal Information:
- European Physical Journal C, Vol. 72, Issue 5
- Country of Publication:
- United States
- Language:
- English
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