Renormalization-group evolution of new physics contributions to (semi)leptonic meson decays

By M. González-Alonso, J. Camalich, Kin Mimouni. 2017

167 citations recorded by the source corpus.

Abstract We study the renormalization group evolution (RGE) of new physics contributions to (semi)leptonic charged-current meson decays, focusing on operators involving a chirality flip at the quark level. We calculate their evolution under electroweak and electromagnetic interactions, including also the three-loop QCD running and provide numerical formulas that allow us to connect the values of the corresponding Wilson coefficients from scales at the TeV to the low-energy scales. The large mixing of the tensor operator into the (pseudo)scalar ones has important phenomenological implications, such as the RGE of new physics bounds obtained from light quark decays or in b → c l ν transitions. For instance, we study scenarios involving tensor effective operators, which have been proposed in the literature to address the B -decay anomalies, most notably those concerning the R D ( ⁎ ) ratios. We conclude that the loop effects are important and should be taken into account in the analysis of these processes, especially if the operators are generated at an energy scale of ∼1 TeV or higher.

Subfields: Nuclear and High Energy Physics

View Paper: https://www.semanticscholar.org/paper/3dd794f32d2258f5f9b36ba8dc30d87a57119f8b

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In Nuclear and High Energy Physics

Citations in the corpus

Constraining new physics in b → cℓν transitions (2018, background): “Indeed, the operators O (1) lequ and O (3) lequ, that match onto OSL and OT , respectively, mix with each other through the weak coupling constants [93].”
General neutrino interactions from an effective field theory perspective (2019, background): “In particular, [17] find that the chargedcurrent (pseudo)scalar and tensor GNI mix as one runs from 2GeV to the weak scale,”
Revisiting the vector leptoquark explanation of the B-physics anomalies (2019, background): “8 accounts for the running of the scalar operator from MU = 4 TeV to mb [59–61].”
Compilation of low-energy constraints on 4-fermion operators in the SMEFT (2017, methodology): “ cledq clequ c(3) lequ (µ= mZ) . (2.20) These results use the QCD beta function and anomalous dimensions up to 3 loops, and we included the bottom and top quark thresholds eﬀects, see Ref. [67] for details. The diagonal entries would change by ∼ 12% if just 1-loop QCD running were included, whi”