Article (Scientific journals)
Left-handed W bosons at the LHC
Bern, Z.; Diana, Giovanni; Dixon, L. J. et al.
2011In Physical Review. D, 84 (3), p. 034008
Peer reviewed
 

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Abstract :
[en] The production of W bosons in association with jets is an important background to new physics at the LHC. Events in which the W carries large transverse momentum and decays leptonically lead to large missing energy and are of particular importance. We show that the left-handed nature of the W coupling, combined with valence quark domination at a pp machine, leads to a large left-handed polarization for both W+ and W- bosons at large transverse momenta. The polarization fractions are very stable with respect to QCD corrections. The leptonic decay of the W± bosons translates the common left-handed polarization into a strong asymmetry in transverse momentum distributions between positrons and electrons and between neutrinos and antineutrinos (missing transverse energy). Such asymmetries may provide an effective experimental handle on separating W+jets from top-quark production, which exhibits very little asymmetry due to C invariance, and from various types of new physics.
Disciplines :
Physics
Author, co-author :
Bern, Z.;  University of California, Los Angeles - UCLA > Department of Physics and Astronomy
Diana, Giovanni ;  CEA–Saclay > Institut de Physique Theorique
Dixon, L. J.;  CERN > Theory Division
Cordero, F. Febres;  Universidad Simon Bolıvar > Departamento de Fısica
Forde, D.;  CERN > Theory division
Gleisberg, T.;  Stanford University > SLAC National Accelerator Laboratory
Hoche, S.;  Stanford University > SLAC National Accelerator Laboratory
Ita, H.;  University of California, Los Angeles - UCLA > Department of Physics and Astronomy
Kosower, D. A.;  CEA–Saclay > Institut de physique theorique
Maitre, D.;  CERN, > Theory division
Ozeren, K.;  University of California, Los Angeles - UCLA > Department of Physics and Astronomy
Language :
English
Title :
Left-handed W bosons at the LHC
Publication date :
2011
Journal title :
Physical Review. D
Publisher :
American Physical Society
Volume :
84
Issue :
3
Pages :
034008
Peer reviewed :
Peer reviewed
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