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arXiv 1202.2866hep-ph
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粲衰变中直接CP破坏的新物理模型

New Physics Models of Direct CP Violation in Charm Decays

Wolfgang Altmannshofer, Reinard Primulando, Chiu-Tien Yu, Felix Yu

摘要:

根据最近LHCb对Delta A_CP的测量,比较了D -> K+K-和D -> pi+pi-衰变中时间积分CP不对称性的差异,研究了新物理自由度对单Cabibbo抑制D介子衰变中直接CP不对称性的可能影响。我们系统地讨论了一组最小的新的自由度,具有重整化耦合的SM粒子,是足够重的,使他们的D介子衰变的影响可以描述的本地运营商的情况。我们考虑到这两个约束,从低能量的味道观测,特别是D 0-D 0 bar混合,并从直接搜索。虽然模型,解释大测量值的三角洲A_CP与手征增强的色磁企鹅是最少的限制,我们确定了一些可行的模型,有助于D介子衰变在树的水平或通过循环引起的QCD企鹅。我们强调,这样的模型激励直接搜索在LHC。

英文摘要:

In view of the recent LHCb measurement of Delta A_CP, the difference between the time-integrated CP asymmetries in D --> K+K- and D --> pi+pi- decays, we perform a comparative study of the possible impact of New Physics degrees of freedom on the direct CP asymmetries in singly Cabibbo suppressed D meson decays. We systematically discuss scenarios with a minimal set of new degrees of freedom that have renormalizable couplings to the SM particles and that are heavy enough such that their effects on the D meson decays can be described by local operators. We take into account both constraints from low energy flavor observables, in particular D0-D0bar mixing, and from direct searches. While models that explain the large measured value for Delta A_CP with chirally enhanced chromomagnetic penguins are least constrained, we identify a few viable models that contribute to the D meson decays at tree level or through loop induced QCD penguins. We emphasize that such models motivate direct searches at the LHC.

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