Left-Handed W bosons at the LHC

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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{sup +} and W{sup -} bosons at large transverse momenta. The polarization fractions are very stable with respect to QCD corrections. The leptonic decay of the W{sup +-} bosons translates the common ... continued below

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32 pages

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Bern, Z.; /UCLA; Diana, G.; /Saclay, SPhT; Dixon, L.J.; /SLAC, /CERN et al. May 20, 2011.

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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{sup +} and W{sup -} bosons at large transverse momenta. The polarization fractions are very stable with respect to QCD corrections. The leptonic decay of the W{sup +-} 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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32 pages

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  • Journal Name: Submitted to Physical Review D

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  • Report No.: SLAC-PUB-14409
  • Grant Number: AC02-76SF00515
  • DOI: 10.1103/PhysRevD.84.034008 | External Link
  • Office of Scientific & Technical Information Report Number: 1014117
  • Archival Resource Key: ark:/67531/metadc832696

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Office of Scientific & Technical Information Technical Reports

Reports, articles and other documents harvested from the Office of Scientific and Technical Information.

Office of Scientific and Technical Information (OSTI) is the Department of Energy (DOE) office that collects, preserves, and disseminates DOE-sponsored research and development (R&D) results that are the outcomes of R&D projects or other funded activities at DOE labs and facilities nationwide and grantees at universities and other institutions.

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  • May 20, 2011

Added to The UNT Digital Library

  • May 19, 2016, 3:16 p.m.

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  • Nov. 29, 2016, 6:25 p.m.

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Bern, Z.; /UCLA; Diana, G.; /Saclay, SPhT; Dixon, L.J.; /SLAC, /CERN et al. Left-Handed W bosons at the LHC, article, May 20, 2011; United States. (digital.library.unt.edu/ark:/67531/metadc832696/: accessed October 18, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.