: a Python package for the running and matching of Wilson coefficients above and below the electroweak scale

Aebischer, Jason; Kumar, Jacky; Straub, David M.

doi:10.1140/epjc/s10052-018-6492-7

Cited by 165 publications

(137 citation statements)

References 52 publications

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“…This Y d running is also important for the other semi-leptonic operator containing quark doublets, O eq . We accounted for these effects in Table II by using the package Wilson [49], finding good agreement with the analytical expressions given above.…”

Section: Iv2 Omentioning

confidence: 52%

“…Now we turn to an estimate of the loop contributions to R K ( * ) from the operators listed above. We used the numerical code flavio [30], combined with the package Wilson [49] for the matching and running of effective coefficients above the electroweak scale. 8 We have verified these numerical results by explicitly computing the RGE effects from the anomalousdimension matrices given in Ref.…”

Section: Iii3 Numerical Resultsmentioning

confidence: 99%

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New physics in $$b\rightarrow s\ell \ell $$ transitions at one loop

et al. 2020

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We investigate new-physics contributions to b → s transitions in the context of an effective field theory extension of the Standard Model, including operator mixing at one loop. We identify the few scenarios where a single Wilson coefficient, C/Λ 2 ∼ 1/TeV 2 , induces a substantial shift in the lepton flavour universality ratios RK and RK * at one loop, while evading Z-pole precision tests, collider bounds, and other flavour constraints. Good fits to the present data are achieved by a left-handed current operator with quark-flavour indices (2, 2) or (3, 3), hitherto overlooked. Interestingly, the running of the Standard Model Yukawa matrices gives the dominant effect for these scenarios. We match the favoured effective-theory scenarios to minimal, single-mediator models, which are subject to additional stringent constraints. Notably, we recognise three viable instances of a leptoquark with one coupling to fermions only. If the anomalies were confirmed, it appears that one-loop explanations have good prospects of being directly tested at the LHC.

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Section: Iv2 Omentioning

confidence: 52%

Section: Iii3 Numerical Resultsmentioning

confidence: 99%

New physics in $$b\rightarrow s\ell \ell $$ transitions at one loop

et al. 2020

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“…In order to relate both EFTs, the matching between the Spin Q.N. Nature Allowed couplings SMEFT WET WET theory and the SMEFT has to be performed at the EW scale [74,75,109,110,113,114]. The matching onto the basis in the non-linear case [115,116] is given in Ref.…”

Section: Interpretation Of Resultsmentioning

confidence: 99%

Global fit to b → cτν transitions

Murgui

Peñuelas

Jung

et al. 2019

J. High Energ. Phys.

163

234

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We perform a general model-independent analysis of b → cτν τ transitions, including measurements of R D , R D * , their q 2 differential distributions, the recently measured longitudinal D * polarization F D * L , and constraints from the B c → τν τ lifetime, each of which has significant impact on the fit. A global fit to a general set of Wilson coefficients of an effective low-energy Hamiltonian is presented, the solutions of which are interpreted in terms of hypothetical new-physics mediators. From the obtained results we predict selected b → cτν τ observables, such as the baryonic transition Λ b → Λ c τν τ , the ratio R J/ψ , the forward-backward asymmetries A D ( * ) FB , the τ polarization asymmetries P D ( * ) τ , and the longitudinal D * polarization fraction F D * L . The latter shows presently a slight tension with any new-physics model, such that an improved measurement could have an important impact. We also discuss the potential change due the very recently announced preliminary R D ( * ) measurement by the Belle collaboration.

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“…A systematic phenomenological analysis of the one-loop matching effects is left for future work. To this end, the inclusion of the matching results in existing SMEFT/LEFT software tools would be useful [20,21]. We provide the complete matching results in electronic form as supplemental material, which should facilitate their further use.…”

Section: Discussionmentioning

confidence: 99%

“…EFT analyses of constraints on NP is a rapidly developing field. For example, the leadinglog calculations have been implemented into software tools that provide automated calculations of bounds on Wilson coefficients [20][21][22] or support an automated calculation of processes at the tree and loop level [23,24].…”

Section: Introductionmentioning

confidence: 99%

Low-energy effective field theory below the electroweak scale: matching at one loop

Dekens

Stoffer

2019

J. High Energ. Phys.

136

164

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We compute the one-loop matching between the Standard Model Effective Field Theory and the low-energy effective field theory below the electroweak scale, where the heavy gauge bosons, the Higgs particle, and the top quark are integrated out. The complete set of matching equations is derived including effects up to dimension six in the power counting of both theories. We present the results for general flavor structures and include both the CP -even and CP -odd sectors. The matching equations express the masses, gauge couplings, as well as the coefficients of dipole, three-gluon, and four-fermion operators in the low-energy theory in terms of the parameters of the Standard Model Effective Field Theory. Using momentum insertion, we also obtain the matching for the CP -violating theta angles. Our results provide an ingredient for a model-independent analysis of constraints on physics beyond the Standard Model. They can be used for fixed-order calculations at one-loop accuracy and represent a first step towards a systematic next-to-leading-log analysis. E SMEFT operator basis 56 F LEFT operator basis 58 G Conventions for the supplemental material 59 References 61

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: a Python package for the running and matching of Wilson coefficients above and below the electroweak scale

Cited by 165 publications

References 52 publications

New physics in $$b\rightarrow s\ell \ell $$ transitions at one loop

New physics in $$b\rightarrow s\ell \ell $$ transitions at one loop

Global fit to b → cτν transitions

Low-energy effective field theory below the electroweak scale: matching at one loop

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