Matching of gauge invariant dimension-six operators for b → s and b → c transitions

Aebischer, Jason; Crivellin, Andreas; Fael, Matteo; Greub, Christoph

doi:10.1007/jhep05(2016)037

Cited by 141 publications

(178 citation statements)

References 127 publications

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“…• The tree-level matching of the Warsaw basis to the B = S = 1, 2 and B = C = 1 operators of the WET at the electroweak scale, using the results in [17].…”

Section: Dsixtools In a Nutshellmentioning

confidence: 99%

“…For this purpose we make use of the analytical results obtained in [17]. This is the list of routines implemented in this module: The EWmatcher module flowchart can be seen in Fig.…”

Section: Ewmatcher Modulementioning

confidence: 99%

“…In the socalled weak effective theory (WET), the SM heavy degrees of freedom (top quark, Higgs, W ± and Z ) have been integrated out. DsixTools implements the tree-level matching of the Warsaw basis to B = S = 1, 2 and B = C = 1 operators of the WET based on the results obtained in [17]. Last but not least, the relevant effects due to QCD and QED running from the electroweak scale down to the b-quark mass scale in the WET is also implemented in DsixTools, using the results in [18].…”

Section: Introductionmentioning

confidence: 99%

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DsixTools: the standard model effective field theory toolkit

et al. 2017

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We present DsixTools, a Mathematica package for the handling of the dimension-six standard model effective field theory. Among other features, DsixTools allows the user to perform the full one-loop renormalization group evolution of the Wilson coefficients in the Warsaw basis. This is achieved thanks to the SMEFTrunner module, which implements the full one-loop anomalous dimension matrix previously derived in the literature. In addition, DsixTools also contains modules devoted to the matching to the B = S = 1, 2 and B = C = 1 operators of the Weak Effective Theory at the electroweak scale, and their QCD and QED Renormalization group evolution below the electroweak scale.

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“…• The tree-level matching of the Warsaw basis to the B = S = 1, 2 and B = C = 1 operators of the WET at the electroweak scale, using the results in [17].…”

Section: Dsixtools In a Nutshellmentioning

confidence: 99%

“…For this purpose we make use of the analytical results obtained in [17]. This is the list of routines implemented in this module: The EWmatcher module flowchart can be seen in Fig.…”

Section: Ewmatcher Modulementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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DsixTools: the standard model effective field theory toolkit

et al. 2017

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“…If the NP is coming from dynamics at Λ v and electro-weak symmetry breaking is linearly realized, then one can use an SU(2) L × U(1) Y invariant effective theory [38,42,44,45]. In this case [32,38,46]:…”

Section: The Low-energy Effective Lagrangianmentioning

confidence: 99%

Global effective-field-theory analysis of new-physics effects in (semi)leptonic kaon decays

González–Alonso

Camalich

2016

J. High Energ. Phys.

129

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We analyze the decays K → π ν and P → ν (P = K, π, = e, µ) using a low-energy Effective-Field-Theory approach to parametrize New Physics and study the complementarity with baryon β decays. We then provide a road map for a global analysis of the experimental data, with all the Wilson coefficients simultaneously, and perform a fit leading to numerical bounds for them and for V us . A prominent result of our analysis is a reinterpretation of the well-known V ud −V us diagram as a strong constraint on new physics. Finally, we reinterpret our bounds in terms of the SU(2) L × U(1) Y -invariant operators, provide bounds to the corresponding Wilson coefficients at the TeV scale and compare our results with collider searches at the LHC.

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“…Similar one-loop diagrams induce b → sγ dipole operators [62,63]. Next, at one loop C γ induces the top gluonic dipole C g , which in turn at the top threshold generates the three-gluon Weinberg coupling CG.…”

mentioning

confidence: 92%

Is there room forCPviolation in the top-Higgs sector?

et al. 2016

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We discuss direct and indirect probes of chirality-flipping couplings of the top quark to Higgs and gauge bosons, considering both CP-conserving and CP-violating observables, in the framework of the Standard Model effective field theory. In our analysis we include current and prospective constraints from collider physics, precision electroweak tests, flavor physics, and electric dipole moments (EDMs). We find that low-energy indirect probes are very competitive, even after accounting for long-distance uncertainties. In particular, EDMs put constraints on the electroweak CP-violating dipole moments of the top that are two to three orders of magnitude stronger than existing limits. The new indirect constraint on the top EDM is given by |dt| < 5 · 10−20 e cm at 90% C.L. Introduction:The top quark might offer a first gateway to physics beyond the Standard Model (BSM), due to its large coupling to the Higgs and hence to the electroweak symmetry breaking sector. In several scenarios, ranging from partial compositeness [1] to supersymmetric models with light stops [2], enhanced deviations from the SM are expected in the top sector which can be relevant for electroweak baryogenesis [2,3]. Experiments at the Large Hadron Collider (LHC) offer a great opportunity to directly probe non-standard top quark couplings. On the other hand, these same couplings also affect via quantum corrections processes that do not involve a top quark. Such "indirect probes" give very valuable complementary information and in several cases constrain non-standard top couplings more strongly than direct searches.In this letter we discuss direct and indirect probes of chirality-flipping top-Higgs couplings, including both CP-conserving (CPC) and CP-violating (CPV) interactions, the latter being of great interest in light of Sakharov's conditions for baryogenesis [4]. Despite the vast literature on top-gluon [5][6][7][8][9][10][11][12][13][14][15][16] [37][38][39][40][41][42], the impact of electric dipole moments (EDMs) has received comparatively little attention [17,29,37,43,44]. The central new element of our work is the systematic inclusion of EDM constraints. Even after properly taking into account the hadronic and nuclear uncertainties [44], EDMs dominate the bounds on all the CPV top couplings. Our major finding is that bounds on the top EDM (weak EDM) are improved by three (two) orders of magnitude over the previous literature. As part of our analysis, we also update indirect constraints from Higgs production and decay.We work in the linear SM Effective Field Theory (SM-EFT) framework [45][46][47][48][49]. We assume that a gap exists between the scale of new physics Λ and the electroweak scale v = 246 GeV and keep only the leading terms in (v/Λ) 2 , corresponding to dimension-six operators. We assume that at the high-scale Λ the largest non-standard effects appear in the top sector, and hence set to zero all

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Matching of gauge invariant dimension-six operators for b → s and b → c transitions

Cited by 141 publications

References 127 publications

DsixTools: the standard model effective field theory toolkit

DsixTools: the standard model effective field theory toolkit

Global effective-field-theory analysis of new-physics effects in (semi)leptonic kaon decays

Is there room forCPviolation in the top-Higgs sector?

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