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arXiv 1107.3559hep-ph
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两个Higgs双态模型中的电弱重子生成和B介子异常

Electroweak Baryogenesis in Two Higgs Doublet Models and B meson anomalies

James M. Cline, Kimmo Kainulainen, Michael Trott

摘要:

出于3.9 sigma的CP违反阶段超出标准模型的证据,在喜欢的符号dimuon不对称性报告DO,我们研究了两个希格斯偶极子模型(2HDMs),以实现成功的电弱重子(EWBG),同时解释dimuon异常的潜力。我们的重点是最小的味道违反2HDM,但我们的模型参数空间的数值扫描包括I型和II型模型作为特殊情况。我们结合了相关的粒子物理约束,包括电弱精确数据,b到s伽马,中子电偶极矩,R_b,和微扰耦合边界来约束模型。令人惊讶的是,我们发现,一个足够大的重子不对称性,只有一贯实现在一个小的子集的参数空间在2HDMS,无论试图同时考虑任何B物理异常。有一些紧张局势之间的同时解释的dimuon异常和重子生成,但使用马尔可夫链蒙特卡罗,我们发现几个模型在1西格玛的中心值。我们指出了以前的研究得出不同结论的缺点。允许EWBG的受限参数空间使得这种情况对于对撞机搜索具有高度预测性。我们讨论了最有前途的签名,追求在大型强子对撞机的EWBG兼容模型。

英文摘要:

Motivated by 3.9 sigma evidence of a CP-violating phase beyond the standard model in the like-sign dimuon asymmetry reported by DO, we examine the potential for two Higgs doublet models (2HDMs) to achieve successful electroweak baryogenesis (EWBG) while explaining the dimuon anomaly. Our emphasis is on the minimal flavour violating 2HDM, but our numerical scans of model parameter space include type I and type II models as special cases. We incorporate relevant particle physics constraints, including electroweak precision data, b to s gamma, the neutron electric dipole moment, R_b, and perturbative coupling bounds to constrain the model. Surprisingly, we find that a large enough baryon asymmetry is only consistently achieved in a small subset of parameter space in 2HDMs, regardless of trying to simultaneously account for any B physics anomaly. There is some tension between simultaneous explanation of the dimuon anomaly and baryogenesis, but using a Markov chain Monte Carlo we find several models within 1 sigma of the central values. We point out shortcomings with previous studies that reached different conclusions. The restricted parameter space that allows for EWBG makes this scenario highly predictive for collider searches. We discuss the most promising signatures to pursue at the LHC for EWBG-compatible models.

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