Exclusive hadronic tau decays as probes of non-SM interactions

Gonzàlez-Solís, Sergi; Miranda, A.; Rendón, Javier; Roig, Pablo

doi:10.1016/j.physletb.2020.135371

Cited by 28 publications

(30 citation statements)

References 93 publications

(197 reference statements)

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“…(55). In fact, in our recent global fit to one-and two-meson tau decays [56], the significance of a nonvanishingε S is reduced to ∼3σ, with small correlations in this case.…”

Section: A Limits Onε S Andε Tmentioning

confidence: 67%

“…Such analysis has very recently been carried out in Ref. [56], where more competitive bounds have been obtained as a result of a global analysis to exclusive hadronic tau decays.…”

Section: A Limits Onε S Andε Tmentioning

confidence: 99%

“…The corresponding expressions for τ − → K − K 0 ν τ are obtained by replacing V us → V ud in Eq. (56) and m η ð 0 Þ → m K 0 , m s → m d , and…”

Section: B Dalitz Plotmentioning

confidence: 99%

“…In Ref [56],. we have very recently obtained more competitive bounds after performing a global analysis of exclusive hadronic tau decays.…”

mentioning

confidence: 99%

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Effective-field theory analysis of the τ−→K−(η(′),K0<

et al. 2020

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We analyze the decays τ − → K − ðη ð0Þ ; K 0 Þν τ within an effective-field theory that includes the most general interactions between Standard Model fields up to dimension six, assuming left-handed neutrinos. In particular, we examine different interesting phenomenological observables, i.e., decay spectra and branching ratio, Dalitz plot distributions, and the forward-backward asymmetry, to explore the sensitivity of the corresponding decays to the effects of nonstandard interactions. A controlled theoretical input on the Standard Model hadronic form factors, based on chiral symmetry, dispersion relations, data, and asymptotic QCD properties, has allowed us to set bounds on the new physics scalar and tensor effective couplings using the measured branching ratios. These are found to be in line with the findings of our series of previous analyses of two-meson tau decays and less precise than the constraints obtained from semileptonic kaon decays. In order to set stringent limits on these couplings, we will use all available experimental data of all possible dimeson tau decays. This is our next step plan, that we hope to be of interest for future experimental analyses of these decays.

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“…(55). In fact, in our recent global fit to one-and two-meson tau decays [56], the significance of a nonvanishingε S is reduced to ∼3σ, with small correlations in this case.…”

Section: A Limits Onε S Andε Tmentioning

confidence: 67%

“…Such analysis has very recently been carried out in Ref. [56], where more competitive bounds have been obtained as a result of a global analysis to exclusive hadronic tau decays.…”

Section: A Limits Onε S Andε Tmentioning

confidence: 99%

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Effective-field theory analysis of the τ−→K−(η(′),K0<

et al. 2020

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“…These results are comparable with the ratios for M X /g X presented in [20] and are of the same order than in the charged-current sector (see, for example, refs. [86] and [87]). 6.…”

Section: Resultsmentioning

confidence: 98%

Global constraints on neutral-current generalized neutrino interactions

Escrihuela

Flores

Miranda

et al. 2021

J. High Energ. Phys.

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We study generalized neutrino interactions (GNI) for several neutrino processes, including neutrinos from electron-positron collisions, neutrino-electron scattering, and neutrino deep inelastic scattering. We constrain scalar, pseudoscalar, and tensor new physics effective couplings, based on the standard model effective field theory at low energies. We have performed a global analysis for the different effective couplings. We also present the different individual constraints for each effective parameter (scalar, pseudoscalar, and tensor). Being a global analysis, we show robust results for the restrictions on the different GNI parameters and improve some of these bounds.

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Renormalization group improved implications of semileptonic operators in SMEFT

Kumar

2022

J. High Energ. Phys.

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We study implications of the four-fermion semileptonic operators at the low-energy and at electroweak (EW) scale in the framework of Standard Model Effective Field Theory (SMEFT). We show how the renormalization group (RG) running effects can play an important role in probing the generic flavour structure of such operators. It is shown that at the 1-loop level, through RG running, depending upon the flavour structure, these operators can give rise to sizable effects at low energy in the electroweak precision (EWP) observables, the leptonic, quark, as well as the Z boson flavour violating decays. To this end, we isolate the phenomenologically relevant terms in the full anomalous dimension matrices (ADMs) and discuss the impact of the QED+QCD running in the Weak effective field theory (WET) and the SMEFT running due to gauge and Yukawa interactions on the dim-4 and dim-6 operators at the low energy. Considering all the relevant processes, we derive lower bounds on new physics (NP) scale Λ for each semileptonic operator, keeping a generic flavour structure. In addition, we also report the allowed ranges for the Wilson coefficients at a fixed value of Λ = 3 TeV.

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Exclusive hadronic tau decays as probes of non-SM interactions

Cited by 28 publications

References 93 publications

Effective-field theory analysis of the τ−→K−(η(′),K0<

Effective-field theory analysis of the τ−→K−(η(′),K0<

Global constraints on neutral-current generalized neutrino interactions

Renormalization group improved implications of semileptonic operators in SMEFT

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