B-decay CP-asymmetries in SUSY with a U(2)3 flavour symmetry

Barbieri, Riccardo; Campli, Paolo; Isidori, Gino; Sala, Filippo; Straub, David M.

doi:10.1140/epjc/s10052-011-1812-1

Cited by 45 publications

(66 citation statements)

References 26 publications

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“…The use of flavour symmetries turned out to be useful also with this respect: a very well-known example is the MFV setup, as previously discussed, whose construction was originally meant exactly to solve this aspect of the Flavour Problem. Promising results have been obtained also with smaller symmetries than the MFV ones, both continuous [110][111][112][113][114][115] and discrete [116][117][118][119][120][121][122][123].…”

Section: Jhep07(2017)089mentioning

confidence: 95%

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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Section: Jhep07(2017)089mentioning

confidence: 95%

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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“…In previous papers [1][2][3] we have invoked a flavour U (2) 3 as a possibly relevant symmetry in this context. Such symmetry is exhibited by the quark sector of the SM, when one neglects the masses of the first two generations and their mixings with the third generation quarks.…”

Section: Introductionmentioning

confidence: 99%

“…In this work we want to complete the analysis of this picture by considering all the possible breaking terms of U (2) 3 entering the quark mass terms…”

Section: Introductionmentioning

confidence: 99%

Less minimal flavour violation

Barbieri

Buttazzo

Sala

et al. 2012

J. High Energ. Phys.

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We consider the approximate U (2) 3 flavour symmetry exhibited by the quark sector of the Standard Model and all its possible breaking terms appearing in the quark Yukawa couplings. Taking an Effective Field Theory point of view, we determine the current bounds on these parameters, assumed to control the breaking of flavour in a generic extension of the Standard Model at a reference scale Λ. In particular, a significant bound from / is derived, which is relevant to Minimal Flavour Violation as well. In the up-quark sector, the recently observed CP violation in D → π + π − , K + K − decays might be accounted for in this generic framework, consistently with any other constraint.

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“…On the one hand, there is a tension in the SM fit between the measurement of φ d and the branching ratio of B → τ ν (see also Refs. [3,4] where the discrepancies with respect to other inputs are discussed, e.g., inclusive or exclusive semileptonic decays, or mixing-dependent observables). On the other hand, the most recent angular analyses of B s → J/Ψφ by CDF, DØ and LHCb [5][6][7] seem to reduce substantially the space for New Physics in φ s .…”

mentioning

confidence: 99%

Analysis ofBd,smixing angles in the presence of new physics and an update ofBs→K¯
Descotes-Genon¹,
Matias²,
Virto³
2012
Phys. Rev. D
56
1
50
0
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We discuss a simple approach to measure the weak mixing angles φs and φ d of the Bs and B d systems in the presence of New Physics. We present a new expression that allows one to measure directly φ NP d,s if New Physics contributes significantly to the mixing only. We apply the method to specific penguin-mediated B → P P , B → P V and B → V V modes. We provide a very stringent and simple bound on the direct CP asymmetries of all these modes, the violation of which is a signal of New Physics in decay. Within the same theoretical framework, an updated prediction for the branching ratio of Bs → K 0 * K 0 * is presented, which can be compared with a recent LHCb analysis.In our quest for New Physics (NP) in flavour processes, the weak angles φ M involved in the mixing of B d (φ d ) and B s (φ s ) mesons have been studied with a great attention recently, since they have shown interesting discrepancies with respect to the Standard Model [1,2]. On the one hand, there is a tension in the SM fit between the measurement of φ d and the branching ratio of B → τ ν (see also Refs. [3,4] where the discrepancies with respect to other inputs are discussed, e.g., inclusive or exclusive semileptonic decays, or mixing-dependent observables). On the other hand, the most recent angular analyses of B s → J/Ψφ by CDF, DØ and LHCb [5][6][7] seem to reduce substantially the space for New Physics in φ s . Finally, there still remains an important discrepancy with the Standard Model through the dimuon asymmetry measured at DØ [8,9].In this context, it is useful to devise alternative methods to extract the mixing angle of both B d (φ d ) and B s (φ s ) systems from experiment. In this paper we will take the point of view of assuming that New Physics contributes significantly only to the mixing phases whereas the formalism of the CKM matrix can still be used to analyse decay amplitudes. Under this assumption we present a clean method to extract the NP contribution to the weak mixing phase φ d,s from selected B d,s → P P, V P and V V decays.Some time ago [10], we proposed a test on the value of sin φ s in the SM by measuring certain longitudinal branching ratios and CP asymmetries of B d,s mesons decaying into vectors, for modes mediated by penguin diagrams -we focused on the potential of the B s →K 0 * K 0 * decay at that time. The method has advantages both from the theoretical and experimental points of view. On the theoretical side, it reduces the required theoretical input mainly to a single hadronic quantity ∆, defined as the difference between "tree" and "penguin" contributions. More precisely, for aB Q meson decaying through a b → q penguin-mediated process, the decompositionwith the CKM factors λUq , can be used to define ∆ as the difference of the hadronic matrix elements that are multiplied by λ (q) u and λ (q) c respectively, i.e.,In the case of penguin-mediated decays, the evaluation of this quantity using QCD factorisation (QCDF) is expected to be particularly robust, as it was built specifically to cancel the infrared divergence...

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B-decay CP-asymmetries in SUSY with a U(2)3 flavour symmetry

Cited by 45 publications

References 26 publications

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

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

Less minimal flavour violation

Analysis ofBd,smixing angles in the presence of new physics and an update ofBs→K¯
Descotes-Genon¹,
Matias²,
Virto³
2012
Phys. Rev. D
56
1
50
0
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B-decay CP-asymmetries in SUSY with a U(2)3 flavour symmetry

Cited by 45 publications

References 26 publications

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

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

Less minimal flavour violation

Analysis ofBd,smixing angles in the presence of new physics and an update ofBs→K¯Descotes-Genon1, Matias2, Virto3 2012Phys. Rev. D561500View full textAdd to dashboardCite

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Product

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About

Analysis ofBd,smixing angles in the presence of new physics and an update ofBs→K¯
Descotes-Genon¹,
Matias²,
Virto³
2012
Phys. Rev. D
56
1
50
0
View full text Add to dashboard Cite