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Measurement of the polarisation of W bosons produced with large transverse momentum in pp collisions at root s=7 TeV with the ATLAS experiment
KTH, School of Engineering Sciences (SCI), Physics, Particle and Astroparticle Physics.
KTH, School of Engineering Sciences (SCI), Physics, Particle and Astroparticle Physics.
KTH, School of Engineering Sciences (SCI), Physics, Particle and Astroparticle Physics.
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Number of Authors: 3034
2012 (English)In: European Physical Journal C, ISSN 1434-6044, E-ISSN 1434-6052, Vol. 72, no 5, 2001- p.Article in journal (Refereed) Published
Abstract [en]

This paper describes an analysis of the angular distribution of W -> e nu and W -> mu nu decays, using data from pp collisions at root s = 7 TeV recorded with the ATLAS detector at the LHC in 2010, corresponding to an integrated luminosity of about 35 pb(-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(0), f(L) and f(R) over two ranges of W transverse momentum (p(T)(W)) : 35 < p(T)(W) < 50 GeV and p(T)(W) > 50 GeV. Good agreement is found with theoretical predictions. For p(T)(W) > 50 GeV, the values of f(0) and f(L) - f(R), averaged over charge and lepton flavour, are measured to be: f(0) = 0.127 +/- 0.030 +/- 0.108 and f(L) - f(R) = 0.252 +/- 0.017 +/- 0.030, where the first uncertainties are statistical, and the second include all systematic effects.

Place, publisher, year, edition, pages
2012. Vol. 72, no 5, 2001- p.
Keyword [en]
Hadronic Collisions, Pair Production, Monte-Carlo, Decay
National Category
Physical Sciences
Identifiers
URN: urn:nbn:se:kth:diva-99504DOI: 10.1140/epjc/s10052-012-2001-6ISI: 000304778800023Scopus ID: 2-s2.0-84862316225OAI: oai:DiVA.org:kth-99504DiVA: diva2:542381
Note
QC 20120731. Author count: 3034.Available from: 2012-07-31 Created: 2012-07-31 Last updated: 2017-12-07Bibliographically approved

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