Left-handed W bosons at the LHC

被引：71

作者：

Bern, Z. ^{[1
]}

Diana, G. ^{[2
]}

Dixon, L. J. ^{[3
,4
]}

Febres Cordero, F. ^{[5
]}

Forde, D. ^{[3
,6
]}

Gleisberg, T. ^{[4
]}

Hoeche, S. ^{[4
]}

Ita, H. ^{[1
]}

Kosower, D. A. ^{[2
]}

Maitre, D. ^{[3
,7
]}

Ozeren, K. ^{[1
]}

机构：

[1] Univ Calif Los Angeles, Dept Phys & Astron, Los Angeles, CA 90095 USA

[2] CEA Saclay, Inst Phys Theor, F-91191 Gif Sur Yvette, France

[3] CERN, Div Theory, Dept Phys, CH-1211 Geneva 23, Switzerland

[4] Stanford Univ, SLAC Natl Accelerator Lab, Stanford, CA 94309 USA

[5] Univ Simon Bolivar, Dept Fis, Caracas 1080A, Venezuela

[6] NIKHEF Theory Grp, NL-1098 XG Amsterdam, Netherlands

[7] Univ Durham, Dept Phys, Durham DH1 3LE, England

来源：

PHYSICAL REVIEW D | 2011年 / 84卷 / 03期

基金：

美国国家科学基金会; 欧洲研究理事会;

关键词：

DISTRIBUTIONS; NLO;

D O I：

10.1103/PhysRevD.84.034008

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

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.

引用

页数：15

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