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arXiv 1010.6069hep-phhep-exhep-lat
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CP破坏的CKM范式崩溃的可能证据

Possible evidence for the breakdown of the CKM-paradigm of CP-violation

E. Lunghi, A. Soni

备注：
6 pages, 8 figures. Added another fit and some more discussion showing that BR(B->tau nu) comes out in good agreement with predictions of the SM if the measured value of sin2beta is not used as an input. References added
发表信息：
Phys.Lett.B697:323-328,2011
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摘要：

主要使用S的实验输入（B -> psi Ks）、Delta M_Bs、Delta M_Bd、BR（B -> τ nu）和τ_K以及来自晶格的必要输入，我们发现sin（2 β）的测量值比标准模型的预期小多达3.3 sigma，并且BR（B -> τ nu）的测量值似乎比预测值小约2.8 σ。然而，通过一个批判性的研究，我们表明，这些偏差的主要来源很可能是在B_d（s）混合和sin（2 β）中，而在B -> τ nu中则较少，而且即使不使用来自于τ_K的输入，大部分问题仍然存在。事实上，K介子混合和K_K不是偏离标准模型的主要来源，这一点具有非常重要的后果，即模型独立的考虑意味着相关的新CP破坏物理的尺度低于O（2 TeV），因此表明新粒子的直接信号很可能在LHC甚至Tevatron的对撞机实验中获得。

英文摘要：

Using primarily experimental inputs for S(B -> psi Ks), Delta M_Bs, Delta M_Bd, BR(B -> tau nu) and epsilon_K along with necessary inputs from the lattice, we find that the measured value of sin(2 beta) is smaller than expectations of the Standard Model by as much as 3.3 sigma, and also that the measured value of the BR(B -> tau nu) seems to be less than the predicted value by about 2.8 sigma. However, through a critical study we show that most likely the dominant source of these deviations is in B_d(s) mixings and in sin(2 beta) and less so in B -> tau nu, and also that the bulk of the problem persists even if input from epsilon_K is not used. The fact that kaon mixing and epsilon_K are not the dominant source of the deviation from the Standard Model has the very important consequence that model independent considerations imply that the scale of the relevant new CP-violating physics is below O(2 TeV), thus suggesting that direct signals of the new particle(s) may well be accessible in collider experiments at the LHC and perhaps even at the Tevatron.

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