On the importance of electroweak corrections for B anomalies

Feruglio, Ferruccio; Paradisi, Paride; Pattori, Andrea

doi:10.1007/jhep09(2017)061

Cited by 139 publications

(185 citation statements)

References 128 publications

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“…Thus we have clear target observables that we can affect with a small number of LQ Yukawa couplings. In the context of SM complemented with effective operators (SM-EFT) it has been shown that NP models contributing to dimension-6 operators made out of left-handed quark and lepton doublets can explain both neutral-and charged-current LFU anomalies [17,32,50,53,54]. However, in an explicit NP model these effective interactions could be JHEP10(2017)188 correlated, unlike in the effective theory, 2 with other observables.…”

Section: Model Setupmentioning

confidence: 99%

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The role of the S 3 GUT leptoquark in flavor universality and collider searches

Doršner

Fajfer

Faroughy

et al. 2017

J. High Energ. Phys.

104

110

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Abstract:We investigate the ability of the S 3 scalar leptoquark to address the recent hints of lepton universality violation in B meson decays. The S 3 leptoquark with quantum numbers (3, 3, 1/3) naturally emerges in the context of an SU(5) GUT model without any conflict with the stringent limits from observed nucleon stability. Scalar leptoquark S 3 with left-handed couplings to 2nd and 3rd generations of charged leptons and down-type quarks seems well-suited to address both R K ( * ) and R D ( * ) . We quantify this suitability with numerical fits to a plethora of relevant flavor observables. The proposed SU(5) model calls for a second leptoquark state, i.e.,R 2 with quantum numbers (3, 2, 1/6), if one is to generate gauge coupling unification and neutrino mass. We accordingly include it in our study to investigateR 2 's ability to offset adverse effects of S 3 and thus improve a quality of numerical fits. A global fit of the leptoquark Yukawa couplings shows that large couplings of light S 3 to τ leptons are preferred. We furthermore identify B → K ( * )ν ν as the most sensitive channel to probe the preferred region of parameter space. Large couplings of S 3 to τ leptons are finally confronted with the experimental searches for τ final states at the Large Hadron Collider. These searches comprise a study of decay products of the leptoquark pair production, as well as, and more importantly, an analysis of the high-mass τ τ final states.

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Section: Model Setupmentioning

confidence: 99%

“…As it has been pointed out recently in the literature [54,55,62] the LFU observable R τ / τ , defined as a ratio B(τ → νν)/B(µ → eνν), and normalized to the SM prediction of this…”

Section: Leptonic Decays: W → τν τ → ννmentioning

confidence: 99%

The role of the S 3 GUT leptoquark in flavor universality and collider searches

Doršner

Fajfer

Faroughy

et al. 2017

J. High Energ. Phys.

104

110

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“…It should be noticed that strong constraints on this setup arise when considering radiative electroweak corrections as discussed in refs. [212,213].…”

Section: Jhep07(2017)089mentioning

confidence: 99%

“…The latter has been recently shown in refs. [212,213] to lead to a rich phenomenology, especially in EWPO and τ sector.…”

Section: B Semi-leptonic Decaysmentioning

confidence: 99%

Revisiting Minimal Lepton Flavour Violation in the light of leptonic CP violation

Dinh

Merlo

Petcov

et al. 2017

J. High Energ. Phys.

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The Minimal Lepton Flavour Violation (MLFV) framework is discussed after the recent indication for CP violation in the leptonic sector. Among the three distinct versions of MLFV, the one with degenerate right-handed neutrinos will be disfavoured, if this indication is confirmed. The predictions for leptonic radiative rare decays and muon conversion in nuclei are analysed, identifying strategies to disentangle the different MLFV scenarios. The claim that the present anomalies in the semi-leptonic B-meson decays can be explained within the MLFV context is critically re-examined concluding that such an explanation is not compatible with the present bounds from purely leptonic processes.

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“…Since the implied scale of new physics is rather low [34], the main challenge is to reconcile it with the non-observation of related signals in (other) flavour changing processes (e.g. [35]), electroweak precision observables, τ decays [36,37], and high-p T searches [15,38].…”

Section: Combined Explanation With R(d ( * ) ) Anomaly (Hints In CC Bmentioning

confidence: 99%

Theory overview on FCNC B-decays

Greljo¹

2017

Proceedings of the European Physical Society Conference on High Energy Physics — PoS(EPS-HEP2017)

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LHCb experiment at CERN has recently reported a set of measurements on lepton flavour universality in b → s transitions showing a departure from the Standard Model predictions. I will review the main ideas recently put forward to make sense out of these intriguing hints. Focusing on the new physics explanation, I will discuss the correlated signals expected in other low-and high-energy observables, that could help clarify the mysterious anomalies.

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On the importance of electroweak corrections for B anomalies

Cited by 139 publications

References 128 publications

The role of the S 3 GUT leptoquark in flavor universality and collider searches

The role of the S 3 GUT leptoquark in flavor universality and collider searches

Revisiting Minimal Lepton Flavour Violation in the light of leptonic CP violation

Theory overview on FCNC B-decays

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