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arXiv 2003.05432hep-ph
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风味数据对MFV SMEFT全局拟合的影响

The impact of flavour data on global fits of the MFV SMEFT

Rafael Aoude, Tobias Hurth, Sophie Renner, William Shepherd

摘要:

我们调查的信息,可以通过包括符合标准模型有效场论(SMEFT)的味道数据与假设的最小味道违规(MFV),允许-作为初始条件在高尺度-领先的条款在spurionic Yukawas的。因此,从一个理论开始,没有树水平的味道改变中性电流的规模的新的物理,我们计算的味道变化过程中的影响在一个循环,以及由此产生的限制SMEFT系数的线性组合,一致参数化的电弱参数和CKM内的SMEFT。通过做一个全球性的配合,包括电弱,希格斯和低能量的精密测量等,我们表明,味观测把强约束以前不受约束的运营商的方向。在其他平坦的方向上,添加味数据会产生四个TeV或更高量级的独立约束;当假设完全U(3)^5味对称时,则会减少到三个。我们的研究结果表明,即使在最无味的情况下,味道仍然是对新物理模型的严格测试。

英文摘要:

We investigate the information that can be gained by including flavour data in fits of the Standard Model Effective Field Theory (SMEFT) with the assumption of Minimal Flavour Violation (MFV), allowing - as initial conditions at the high scale - leading terms in spurionic Yukawas only. Starting therefore from a theory with no tree level flavour changing neutral currents at the scale of new physics, we calculate effects in flavour changing processes at one loop, and the resulting constraints on linear combinations of SMEFT coefficients, consistently parameterising the electroweak parameters and the CKM within the SMEFT. By doing a global fit including electroweak, Higgs and low energy precision measurements among others, we show that flavour observables put strong constraints on previously unconstrained operator directions. The addition of flavour data produces four independent constraints at order TeV or above on otherwise flat directions; reducing to three when complete U(3)^5 flavour symmetry is assumed. Our findings demonstrate that flavour remains a stringent test for models of new physics, even in the most flavourless scenario.

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