Top Quark Forward-Backward Asymmetry and Same-Sign Top Quark Pairs

被引：88

作者：

Berger, Edmond L. ^{[1
]}

Cao, Qing-Hong ^{[1
,2
,4
,5
]}

Chen, Chuan-Ren ^{[3
]}

Li, Chong Sheng ^{[4
,5
]}

Zhang, Hao ^{[4
,5
]}

机构：

[1] Argonne Natl Lab, Div High Energy Phys, Argonne, IL 60439 USA

[2] Univ Chicago, Enrico Fermi Inst, Chicago, IL 60637 USA

[3] Univ Tokyo, Inst Phys & Math Universe, Chiba 2778568, Japan

[4] Peking Univ, Dept Phys, Beijing 100871, Peoples R China

[5] Peking Univ, State Key Lab Nucl Phys & Technol, Beijing 100871, Peoples R China

来源：

PHYSICAL REVIEW LETTERS | 2011年 / 106卷 / 20期

基金：

中国国家自然科学基金;

关键词：

CHIRAL COLOR SYMMETRY; HADRON COLLIDERS; G'-BOSON; LHC; TEVATRON; PHYSICS;

D O I：

10.1103/PhysRevLett.106.201801

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

The top quark forward-backward asymmetry measured at the Tevatron collider shows a large deviation from standard model expectations. Among possible interpretations, a nonuniversal Z' model is of particular interest as it naturally predicts a top quark in the forward region of large rapidity. To reproduce the size of the asymmetry, the couplings of the Z' to standard model quarks must be large, inevitably leading to copious production of same-sign top quark pairs at the energies of the Large Hadron Collider (LHC). We explore the discovery potential for tt and ttj production in early LHC experiments at 7-8 TeV and conclude that if no tt signal is observed with 1 fb(-1) of integrated luminosity, then a nonuniversal Z' alone cannot explain the Tevatron forward-backward asymmetry.

引用

页数：4

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