منابع مشابه
Top quark forward-backward asymmetry and same-sign top quark pairs.
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, ...
متن کاملTop quark forward-backward asymmetry from new t-channel physics
Sunghoon Jung, Hitoshi Murayama, Aaron Pierce, and James D. Wells Michigan Center for Theoretical Physics, University of Michigan, Ann Arbor, Michigan 48109, USA Department of Physics, University of California, Berkeley, California 94720, USA Theoretical Physics Group, LBNL, Berkeley, California 94720, USA IPMU, University of Tokyo, 5-1-5 Kashiwa-no-ha, Kashiwa, Japan 277-8568 CERN Theoretical ...
متن کاملDecay Rate Asymmetry of the Top Quark through Light
A decay rate asymmetry of the top quark is discussed within the framework of the supersymmetric standard model. Although new sources of CP violation in this model are severely constrained from the electric dipole moments of the neutron and the electron, there is a possibility that a top squark has a mass of around 100 GeV and CP violation in its interaction with a top quark is unsuppressed. The...
متن کاملThreshold Resummation for the Top Quark Charge Asymmetry
We study the QCD charge asymmetry in tt̄ production at the Tevatron. We investigate the role of higher orders in perturbation theory by considering the resummation of potentially large logarithmic corrections that arise near partonic threshold. This requires us to employ the rapiditydependent anomalous dimension matrices that describe color mixing due to soft gluon emission in both quarkand gluo...
متن کاملTop Quark Rapidity Distribution and Forward-backward Asymmetry
I present results for the top quark rapidity distribution at LHC and Tevatron energies, including higher-order corrections from threshold resummation. The next-tonext-to-leading-order (NNLO) soft-gluon corrections at next-to-next-to-leading-logarithm (NNLL) level are added to the NLO result. Theoretical predictions are shown for the rapidity distribution, including the scale dependence of the d...
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ژورنال
عنوان ژورنال: Physics Letters B
سال: 2009
ISSN: 0370-2693
DOI: 10.1016/j.physletb.2009.11.015