Renormalization group improved implications of semileptonic operators in SMEFT

Kumar, Jacky

doi:10.1007/jhep01(2022)107

Cited by 9 publications

(6 citation statements)

References 75 publications

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“…respectively, in terms of the Gell-Mann matrices. 13 The {I, I 3 , Y} values of components of the fundamental and antifundamental irreps are shown in figure 2. It can be seen here that only the first two generations have non-zero I 3 (hence the suggestion of the name "lightspin") while the third generation has only non-zero Y (hence "thirdness").…”

Section: Jhep03(2023)226mentioning

confidence: 99%

“…(2.40) 13 We work in a convention where these are defined λ1 For example, the coefficient c 11 23 has n 1 = 2, n 2 = 1, n 3 = 1 and hence (I 3 , Y) = 3 2 , 1 . In figure 3 we show the components of the singlet, octet and 27-plet irreps on the {I, I 3 , Y} plane.…”

Section: Jhep03(2023)226mentioning

confidence: 99%

“…(c8,8) * = −c8,1 = 2c [12] [23] , (c8,7) * = c8,2 = 2c [12] [13] , (c8,5) * = −c8,3 = −2c [13] [23] ,…”

Section: G3 C [Pr] [Qs]mentioning

confidence: 99%

“…[13] + c [23] [23] , c8,6 = 2 3 −2c [12] [12] + c [13] [13] + c [12] + c [13] [13] + c Open Access. This article is distributed under the terms of the Creative Commons Attribution License (CC-BY 4.0), which permits any use, distribution and reproduction in any medium, provided the original author(s) and source are credited.…”

Section: G3 C [Pr] [Qs]mentioning

confidence: 99%

“…[8][9][10][11]), and flavourless observables are dependent on flavour violating or non-universal operators (e.g. [12][13][14]).…”

Section: Jhep03(2023)226 1 Introductionmentioning

confidence: 99%

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Building blocks of the flavourful SMEFT RG

Machado

Renner

Sutherland

2023

J. High Energ. Phys.

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A powerful aspect of effective field theories is connecting scales through renormalisation group (RG) flow. The anomalous dimension matrix of the Standard Model Effective Field Theory (SMEFT) encodes clues to where to find relics of heavy new physics in data, but its unwieldy 2499 × 2499 size (at operator dimension 6) makes it difficult to draw general conclusions. In this paper, we study the flavour structure of the SMEFT one loop anomalous dimension matrix of dimension 6 current-current operators, a 1460 × 1460 submatrix. We take an on-shell approach, laying bare simple patterns by factorising the entries of the matrix into their gauge, kinematic and flavour parts. We explore the properties of different diagram topologies, and make explicit the connection between the IR-finiteness of certain diagrams and their gauge and flavour structure. Through a completely general flavour decomposition of the Wilson coefficient matrices, we uncover new flavour selection rules, from which small subsystems emerge which mix almost exclusively amongst themselves. We show that, for example, if we neglect all Yukawa couplings except for that of the top quark, the selection rules produce block diagonalisation within the current-current operators in which the largest block is a 61 × 61 matrix. We provide all the ingredients of the calculations in comprehensive appendices, including SM and SMEFT helicity amplitudes, and explicit results for phase space integrals and gauge contractions. This deconstruction of the matrix, and its resulting block-diagonalisation, provides a first step to understanding the IR-relevant directions in the SMEFT parameter space, hence closing in on natural places for heavy new physics to make itself known.

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Section: Jhep03(2023)226mentioning

confidence: 99%

Section: Jhep03(2023)226mentioning

confidence: 99%

“…(c8,8) * = −c8,1 = 2c [12] [23] , (c8,7) * = c8,2 = 2c [12] [13] , (c8,5) * = −c8,3 = −2c [13] [23] ,…”

Section: G3 C [Pr] [Qs]mentioning

confidence: 99%

Section: G3 C [Pr] [Qs]mentioning

confidence: 99%

“…[8][9][10][11]), and flavourless observables are dependent on flavour violating or non-universal operators (e.g. [12][13][14]).…”

Section: Jhep03(2023)226 1 Introductionmentioning

confidence: 99%

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Building blocks of the flavourful SMEFT RG

Machado

Renner

Sutherland

2023

J. High Energ. Phys.

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Rare b decays meet high-mass Drell-Yan

Greljo

Šalko

Smolkovič

et al. 2023

J. High Energ. Phys.

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Rare b hadron decays are considered excellent probes of new semileptonic four-fermion interactions of microscopic origin. However, the same interactions also correct the high-mass Drell-Yan tails. In this work, we revisit the first statement in the context of this complementarity and chart the space of short-distance new physics that could show up in rare b decays. We analyze the latest b → qℓ+ℓ− measurements, where q = d or s and ℓ = e or μ, including the most recent LHCb $$ {R}_{K^{\left(\ast \right)}} $$ R K ∗ update, together with the latest charged and neutral current high-mass Drell-Yan data, pp → ℓν and pp → ℓ+ℓ−. We implement a sophisticated interpretation pipeline within the flavio framework, allowing us to investigate the multidimensional SMEFT parameter space thoroughly and efficiently. To showcase the new functionalities of flavio, we construct several explicit models featuring either a Z′ or a leptoquark, which can explain the tension in b → sμ+μ− angular distributions and branching fractions while predicting lepton flavor universality (LFU) ratios to be SM-like, $$ {R}_{K^{\left(\ast \right)}}\approx {R}_{K^{\left(\ast \right)}}^{\textrm{SM}} $$ R K ∗ ≈ R K ∗ SM , as indicated by the recent data. Those models are then confronted against the global likelihood, including the high-mass Drell-Yan, either finding tensions or compatibility.

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Flavorful electroweak precision observables in the Standard Model effective field theory

Dawson

Giardino

2022

Phys. Rev. D

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Renormalization group improved implications of semileptonic operators in SMEFT

Cited by 9 publications

References 75 publications

Building blocks of the flavourful SMEFT RG

Building blocks of the flavourful SMEFT RG

Rare b decays meet high-mass Drell-Yan

Flavorful electroweak precision observables in the Standard Model effective field theory

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