Opportunistic CP violation

Opportunistic CP violation
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机会性CP违规

DOI:
10.1007/jhep06(2023)141
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发表时间:
2023
影响因子:
5.4
通讯作者:
Ruderman, Joshua T.
Ruderman, Joshua T.
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
Bonnefoy, Quentin;Gendy, Emanuele;Grojean, Christophe;Ruderman, Joshua T.

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在标准模型的弱电区,CP破坏是通过三代夸克之间的一种非常特殊的相互作用而产生的,如Cabibbo-Kobayashi-Maskawa(CKM)机制和单个Jarlskog不变量J4所描述的那样。一旦推广到标准模型有效场论(SMEFT),这种特殊的模式就会被高维算符修正,其相关的Wilson系数通常被分成CP-偶数和奇数部分。然而,在四维处的CP破坏,即在EFT展开式中的最低阶,模糊了这一区别:任何威尔逊系数都可以干扰J4并中介CP破坏。本文研究了SMEFT展开式𝒪(1/Λ2)中一阶的这种干扰,并通过一组1551个线性CP-奇味不变量捕捉到了它们的相关参数空间。这一结构既描述了新的、真正破坏CP的量,也描述了J4和CP守恒量之间的干扰。我们称后一种可能性为机会性CP违规。依赖于矩阵秩到泰勒展开的适当扩展,我们称之为泰勒秩,我们定义了一个过程来根据不变量的大小来组织它们,以便在给定的精度下只保留相关的不变量。我们探讨了当对SMEFT系数的风味结构做出不同的假设时,这种特征是如何变化的。有趣的是,一些奇数CP不变量被证明没有J4那么受抑制,即使当它们捕捉到机会主义的CPV时,也证明了在4维的SM中的CP破坏是意外地小的。
In the electroweak sector of the Standard Model, CP violation arises through a very particular interplay between the three quark generations, as described by the Cabibbo-Kobayashi-Maskawa (CKM) mechanism and the single Jarlskog invariant J 4. Once generalized to the Standard Model Effective Field Theory (SMEFT), this peculiar pattern gets modified by higher-dimensional operators, whose associated Wilson coefficients are usually split into CP-even and odd parts. However, CP violation at dimension four, ie, at the lowest order in the EFT expansion, blurs this distinction: any Wilson coefficient can interfere with J 4 and mediate CP violation. In this paper, we study such interferences at first order in the SMEFT expansion, 𝒪 (1/Λ 2), and we capture their associated parameter space via a set of 1551 linear CP-odd flavor invariants. This construction describes both new, genuinely CP-violating quantities as well as the interference between J 4 and CP-conserving ones. We call this latter possibility opportunistic CP violation. Relying on an appropriate extension of the matrix rank to Taylor expansions, which we dub Taylor rank, we define a procedure to organize the invariants in terms of their magnitude, so as to retain only the relevant ones at a given precision. We explore how this characterization changes when different assumptions are made on the flavor structure of the SMEFT coefficients. Interestingly, some of the CP-odd invariants turn out to be less suppressed than J 4, even when they capture opportunistic CPV, demonstrating that CP-violation in the SM, at dimension 4, is accidentally small.
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