Left-Handed W Bosons at the LHC

Details Left-Handed W Bosons at the LHC Left-Handed W Bosons at the LHC

2011-03-28

arxiv.org/abs/1103.5445v2

Phys.Rev.D84:034008,2011

Physics

High Energy Physics

High Energy Physics - Phenomenology

32 pages, revtex, 17 figures, 3 tables, v2 minor corrections to ME+PS results, no changes to conclusions, added references

Scientific paper

10.1103/PhysRevD.84.034008

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 anti-neutrinos (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.

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