论文标题
风味数据对MFV SMEFT全球拟合的影响
The impact of flavour data on global fits of the MFV SMEFT
论文作者
论文摘要
我们调查了可以通过在标准模型有效野外理论（SMEFT）的拟合中加入风味数据的信息，并假设侵犯最小风味（MFV），从而仅作为高尺度的初始条件 - 仅在Spurionic Yukawawas中的主要条件。因此，从没有树水平的风味在新物理学的规模下变化中性电流的理论开始，我们在一个循环时计算出风味变化过程中的效果，以及对SMEFT系数的线性组合的限制，始终参与电动eak参数和SMEFT内的CKM。通过进行全球拟合度，包括Electroweak，Higgs和低能精度测量值，我们表明，风味可观察物在以前不受约束的操作员方向上构成了强大的限制。风味数据的添加在TEV订单或以上方向上产生四个独立的约束；假设完成U（3）^5风味对称性时，将减少到三个。我们的发现表明，即使在最无味的情况下，风味仍然是对新物理模型的严格测试。
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.
