Supersymmetric QCD and CP-violation effects in t(t)over-barZ0 production at the LHC

被引：6
作者：
Liu, Ning [1 ]
Guo, Lei [1 ]
Ma, Wen-Gan [1 ]
Zhang, Ren-You [1 ]
Han, Liang [1 ]
机构：
[1] Univ Sci & Technol China, Dept Modern Phys, Hefei 230026, Anhui, Peoples R China
来源：
PHYSICAL REVIEW D | 2010年 / 82卷 / 01期
基金：
中国国家自然科学基金; 中国博士后科学基金;
关键词：
PAIR PRODUCTION; P(P)OVER-BAR COLLISIONS; RADIATIVE-CORRECTIONS; BROKEN SYMMETRIES; QUARK PRODUCTION; SEARCH; PHYSICS;
D O I：
10.1103/PhysRevD.82.015009
中图分类号：
P1 [天文学];
学科分类号：
0704 ;
摘要：
We investigate the NLO QCD and the CP-violation effects in t (t) over barZ(0) production at the LHC in the minimal supersymmetric standard model (MSSM). Our calculation shows that the total NLO QCD correction in the framework of the CP-conserving MSSM significantly improves the scale uncertainty at the leading order, and the contribution from the pure supersymmetric QCD (pSQCD) correction can exceed -8% with the restrictions of 90 GeV < p(T)(t) < 120 GeV and 120 GeV < p(T)(Z) < 150 GeV, where p(T)(t) and p(T)(Z) are the transverse momenta of the top quark and Z(0) gauge boson, respectively. Our numerical results demonstrate that the pure supersymmetric QCD correction generally suppresses the total standard model-like QCD correction in the CP-conserving MSSM, and tends to be a constant when either (t) over tilde (1) or (g) over tilde is heavy enough. We find also that the CP-odd asymmetry A(Phi) can reach 2.17 x 10(-3), if the CP-phase angle really exists in the coupling of gluino-stop-top.
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页数：14
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