Flavoured B−L local symmetry and anomalous rare B decays

Alonso, Rodrigo; Cox, Peter; Han, Chengcheng; Yanagida, Tsutomu T.

doi:10.1016/j.physletb.2017.10.027

Cited by 126 publications

(91 citation statements)

References 39 publications

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“…4 We focus here on the single mediator models in which the required effect is obtained by integrating out a single resonance. These include either an extra Z bosons [29,33,[38][39][40][41][42][43][44][45][46][47][48][49][50][51][52] or a leptoquark [28,[53][54][55][56][57][58][59][60][61][62] (for a recent review on leptoquarks see [63]). 4 Note that including a loop suppression factor of ∼ We note that a full set of single mediator models with tree-level matching to the vector triplet (c…”

Section: Model Examplesmentioning

confidence: 99%

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High- $$p_T$$ p T dilepton tails and flavor physics

2017

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We investigate the impact of flavor-conserving, non-universal quark-lepton contact interactions on the dilepton invariant mass distribution in p p → + − processes at the LHC. After recasting the recent ATLAS search performed at 13 TeV with 36.1 fb −1 of data, we derive the best up-to-date limits on the full set of 36 chirality-conserving four-fermion operators contributing to the processes and estimate the sensitivity achievable at the HL-LHC. We discuss how these high-p T measurements can provide complementary information to the low-p T rare meson decays. In particular, we find that the recent hints on lepton-flavor universality violation in b → sμ + μ − transitions are already in mild tension with the dimuon spectrum at high-p T if the flavor structure follows minimal flavor violation. Even if the mass scale of new physics is well beyond the kinematical reach for on-shell production, the signal in the high-p T dilepton tail might still be observed, a fact that has been often overlooked in the present literature. In scenarios where new physics couples predominantly to third generation quarks, instead, the HL-LHC phase is necessary in order to provide valuable information.

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Section: Model Examplesmentioning

confidence: 99%

“…[52]. An anomaly-free horizontal gauge symmetry is introduced, with a corresponding gauge field (Z h ) having MFV-like couplings in the quark sector.…”

Section: Model Examplesmentioning

confidence: 99%

High- $$p_T$$ p T dilepton tails and flavor physics

2017

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“…An alternative is to gauge the symmetry [79][80][81][82][83]88]: the would-be-Goldstone bosons would be eaten by flavour gauge bosons that enrich the spectrum. In recent papers [214,215], a specific gauge boson arising from the chosen gauged flavour symmetry has the specific couplings to explain the b → s anomalies here mentioned.…”

Section: Jhep07(2017)089mentioning

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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“…There are ongoing discussions of the possible systematic effects and the uncertaina e-mail: patrick.tunney@kcl.ac.uk ties in the SM calculations, so the jury is still out on the significances of these flavour anomalies [12]. In the meantime, it is interesting to explore possible interpretations and look for other phenomenological signatures that might corroborate them [13][14][15][16][17][18][19][20][21][22][23][24][25][26][27][28][29][30][31][32].…”

Section: Introductionmentioning

confidence: 99%

“…A popular interpretation of this anomaly is that it is due to the exchange of a U(1) gauge boson Z with non-universal couplings to both quarks and leptons [15,[22][23][24]27,28,31,[33][34][35][36][37][38][39][40][41][42][43][44][45][46][47][48][49][50][51][52]. It is possible to take a purely phenomenological attitude to this possibility, and not (yet) concern oneself about the theoretical consistency of such a Z model.…”

Section: Introductionmentioning

confidence: 99%

Anomaly-free models for flavour anomalies

2018

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We explore the constraints imposed by the cancellation of triangle anomalies on models in which the flavour anomalies reported by LHCb and other experiments are due to an extra U(1) gauge boson Z . We assume universal and rational U(1) charges for the first two generations of lefthanded quarks and of right-handed up-type quarks but allow different charges for their third-generation counterparts. If the right-handed charges vanish, cancellation of the triangle anomalies requires all the quark U(1) charges to vanish, if there are either no exotic fermions or there is only one Standard Model singlet dark matter (DM) fermion. There are non-trivial anomaly-free models with more than one such 'dark' fermion, or with a single DM fermion if right-handed up-type quarks have non-zero U(1) charges. In some of the latter models the U(1) couplings of the first-and secondgeneration quarks all vanish, weakening the LHC Z constraint, and in some other models the DM particle has purely axial couplings, weakening the direct DM scattering constraint. We also consider models in which anomalies are cancelled via extra vector-like leptons, showing how the prospective LHC Z constraint may be weakened because the Z → μ + μ − branching ratio is suppressed relative to other decay modes.

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Flavoured B−L local symmetry and anomalous rare B decays

Cited by 126 publications

References 39 publications

High- $$p_T$$ p T dilepton tails and flavor physics

High- $$p_T$$ p T dilepton tails and flavor physics

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

Anomaly-free models for flavour anomalies

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