Joint lattice QCD–dispersion theory analysis confirms the quark-mixing top-row unitarity deficit

Seng, Chien-Yeah; Feng, Xu; Gorchtein, Mikhail; Jin, Luchang

doi:10.1103/physrevd.101.111301

Cited by 130 publications

(121 citation statements)

References 37 publications

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“…0.97370 ± 0.00014 (SGPR) [14], 0.97389 ± 0.00018 (CMS) [15], 0.97365 ± 0.00015 (SFGJ) [16], (1.2) which are consistent with each other. On the other hand, |V us /V ud | and |V us | are extracted from the leptonic-decay ratio K µ2 /π µ2 and the semileptonic decays K 3 ( = e, µ), respectively [17,18]:…”

Section: Jhep08(2020)004supporting

confidence: 78%

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Muon g − 2 and CKM unitarity in extra lepton models

Endo

Mishima

2020

J. High Energ. Phys.

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We investigate the impact of extra leptons on observed tensions in the muon g − 2 and the first-row CKM unitarity. By introducing a new SU(2) L doublet lepton and a SU(2) L triplet lepton, we find that both of the tensions can be explained simultaneously under constraints from electroweak precision observables and Higgs-boson decays. Our model could be tested by measurements of h → µµ at future collider experiments.

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Section: Jhep08(2020)004supporting

confidence: 78%

“…ref. [12]) where K = 8120.2776(9)×10 −10 GeV −4 s and F t = 3072.07(63)s. 11 Also, the EW radiative corrections are given as [14], 0.02426 ± 0.00032 (CMS) [15], 0.02477 ± 0.00024 (SFGJ) [16].…”

Section: Jhep08(2020)004mentioning

confidence: 99%

Muon g − 2 and CKM unitarity in extra lepton models

Endo

Mishima

2020

J. High Energ. Phys.

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“…Especially the former is important, because it is necessary to extract V ud from nuclear data. Four recent calculations of this quantity are available [24][25][26][27], all within 1σ. In this analysis we use the Seng et al evaluation, ∆ V R = 0.02467( 22) [24], which has the smallest uncertainty.…”

Section: Jhep04(2021)126mentioning

confidence: 99%

“…Apart from these changes in the experimental input, this analysis also takes into account important changes concerning theory input, which we discuss in the rest of this section. As mentioned in section 2.1, we take into account the most recent calculations and averages of the nucleon charges g A,S,T [20][21][22], as well as the new calculations of the inner radiative corrections ∆ V,A R [24][25][26][27]. In addition to these developments at the nucleon level, refs.…”

Section: Fermi Gamow-teller and Neutron Decaysmentioning

confidence: 99%

Comprehensive analysis of beta decays within and beyond the Standard Model

Falkowski

González–Alonso

Naviliat‐Cuncic

2021

J. High Energ. Phys.

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Precision measurements in allowed nuclear beta decays and neutron decay are reviewed and analyzed both within the Standard Model and looking for new physics. The analysis incorporates the most recent experimental and theoretical developments. The results are interpreted in terms of Wilson coefficients describing the effective interactions between leptons and nucleons (or quarks) that are responsible for beta decay. New global fits are performed incorporating a comprehensive list of precision measurements in neutron decay, superallowed 0+→ 0+ transitions, and other nuclear decays that include, for the first time, data from mirror beta transitions. The results confirm the V-A character of the interaction and translate into updated values for Vud and gA at the 10−4 level. We also place new stringent limits on exotic couplings involving left-handed and right-handed neutrinos, which benefit significantly from the inclusion of mirror decays in the analysis.

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“…Here, the description relies heavily on the evaluation of radiative corrections and we consider the latest estimates in Ref. [8] (NNC indicate the scenario with the nuclear corrections discussed for the first time in [9,10]):…”

Section: Introductionmentioning

confidence: 99%

Modified lepton couplings and the Cabibbo-angle anomaly

Manzari¹,

Coutinho²,

Crivellin³

2020

Proceedings of the Eighth Annual Conference on Large Hadron Collider Physics — PoS(LHCP2020)

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Significant discrepancies between the different determinations of the Cabibbo angle have been observed. Here, we point out that this "Cabibbo-angle anomaly" can be explained by lepton flavour universality (LFU) violating New Physics (NP) in the neutrino sector. However, modified neutrino couplings to Standard Model gauge bosons also affect many other observables sensitive to LFU violation, which have to be taken into account in order to assess the viability of this explanation. Therefore, we perform a model-independent Bayesian global analysis and find that non-zero modifications of electron and muon neutrino couplings are preferred at more than 99.99% C.L. (corresponding to more than 4 σ). Our results show that constructive effects in the muon sector are necessary, meaning simple models with right-handed neutrinos are discarded and more sophisticated NP models required.

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Joint lattice QCD–dispersion theory analysis confirms the quark-mixing top-row unitarity deficit

Cited by 130 publications

References 37 publications

Muon g − 2 and CKM unitarity in extra lepton models

Muon g − 2 and CKM unitarity in extra lepton models

Comprehensive analysis of beta decays within and beyond the Standard Model

Modified lepton couplings and the Cabibbo-angle anomaly

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