B -> bar K*(-> bar K pi)1 + 1-和未标记bar B_s,B_s -> phi(-> K+ K-)1 + 1-中的CP不对称性在NLO处衰变
CP Asymmetries in bar B -> bar K* (-> bar K pi) l+ l- and Untagged bar B_s,B_s -> phi (-> K+ K-) l+ l- Decays at NLO
摘要:
衰变棒B ->棒K*(->棒K π)l+ l-提供了通过角分析来探索电弱标度及以上的物理的很好机会。我们研究的物理势的七CP不对称加上不对称的速度,工作在低双轻子质量下使用QCD因子分解在次领先阶(NLO)。在标准模型及其扩展中,b ->s CP不对称性是双重Cabibbo抑制的\lesssim 1%,其中CKM矩阵是CP破坏的唯一来源。三个CP不对称是T-奇的,并且在存在非标准CP破坏的情况下可以是O(1)。T偶不对称性可以达到O(0.1),受到大反冲区中小的强相的限制。此外,我们还指出了一种简单的方法,即从时间积分的、无标记的棒B_d,B_d -> K ~*(-> K + K ~-)l+ l-和棒B_s,B_s -> phi(-> K+ K ~-)l+ l-衰变中测量CP相。对这些CP不对称性的分析可以排除或进一步支持通过CKM机制对CP破坏的最小描述。实验研究对(超级)香料工厂和强子对撞机来说是有希望的。
英文摘要:
The decay bar B -> bar K* (-> bar K pi) l+ l- offers great opportunities to explore the physics at and above the electroweak scale by means of an angular analysis. We investigate the physics potential of the seven CP asymmetries plus the asymmetry in the rate, working at low dilepton mass using QCD factorization at next-to leading order (NLO). The b ->s CP asymmetries are doubly Cabibbo-suppressed \lesssim 1 % in the Standard Model and its extensions where the CKM matrix is the only source of CP violation. Three CP asymmetries are T-odd, and can be O(1) in the presence of non-standard CP violation. The T-even asymmetries can reach O(0.1), limited by the small strong phases in the large recoil region. We furthermore point out an easy way to measure CP phases from time-integrated, untagged bar B_d, B_d -> K* (-> K0 pi0) l+ l- and bar B_s,B_s -> phi (-> K+ K-) l+ l- decays. Analyses of these CP asymmetries can rule out, or further support the minimal description of CP violation through the CKM mechanism. Experimental studies are promising for (super) flavor factories and at hadron colliders.
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