Exploring new physics in the C 7-C 7′ plane

Descotes-Genon, S.; Ghosh, Diptimoy; Matias, Joaquim; Ramon, Marc

doi:10.1007/jhep06(2011)099

Cited by 87 publications

(72 citation statements)

References 99 publications

(297 reference statements)

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“…[6,40] for the definition of the operators and Wilson coefficients). If the form factors are computed fully non-perturbatively, predictions obtained in this way include factorisable α s and 1/m b power corrections to all orders.…”

Section: Jhep12(2014)125mentioning

confidence: 99%

On the impact of power corrections in the prediction of B → K *μ+μ− observables

Descotes-Genon

Hofer

Matias

et al. 2014

J. High Energ. Phys.

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Abstract:The recent LHCb angular analysis of the exclusive decay B → K * µ + µ − has indicated significant deviations from the Standard Model expectations. Accurate predictions can be achieved at large K * -meson recoil for an optimised set of observables designed to have no sensitivity to hadronic input in the heavy-quark limit at leading order in α s . However, hadronic uncertainties reappear through non-perturbative Λ QCD /m b power corrections, which must be assessed precisely. In the framework of QCD factorisation we present a systematic method to include factorisable power corrections and point out that their impact on angular observables depends on the scheme chosen to define the soft form factors. Associated uncertainties are found to be under control, contrary to earlier claims in the literature. We also discuss the impact of possible non-factorisable power corrections, including an estimate of charm-loop effects. We provide results for angular observables at large recoil for two different sets of inputs for the form factors, spelling out the different sources of theoretical uncertainties. Finally, we comment on a recent proposal to explain the anomaly in B → K * µ + µ − observables through charm-resonance effects, and we propose strategies to test this proposal identifying observables and kinematic regions where either the charm-loop model can be disentangled from New Physics effects or the two options leave different imprints.

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Section: Jhep12(2014)125mentioning

confidence: 99%

On the impact of power corrections in the prediction of B → K *μ+μ− observables

Descotes-Genon

Hofer

Matias

et al. 2014

J. High Energ. Phys.

Self Cite

227

242

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“…Combination of all three of them can in principle put a strong constraint on the short-distance C ( ) 7γ coefficients in a modelindependent way which then can be used as a constraint in building the NP models. In this sense the content of this paper is a contribution to the broad effort in the particle physics community to search for NP through b → s exclusive decays [23][24][25][26][27][28][29][30][31][32][33][34].…”

Section: Jhep08(2012)090mentioning

confidence: 99%

Future prospects for the determination of the Wilson coefficient $ C_{{^{{7\gamma }}}}^{\prime } $

Bečirević

Kou

Yaouanc

et al. 2012

J. High Energ. Phys.

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Abstract:We discuss the possibilities of assessing a non-zero C 7γ from the direct and the indirect measurements of the photon polarization in the exclusive b → sγ ( * ) decays. We focus on three methods and explore the following three decay modes: B → K * (→ K S π 0 )γ, B → K 1 (→ Kππ)γ, and B → K * (→ Kπ) + − . By studying different New Physics scenarios we show that the future measurement of conveniently defined observables in these decays could provide us with the full determination of C 7γ and C 7γ .

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“…eq (9), so that comparing different schemes allows to test the robustness of the approach introduced in [33] and refined here. Our particular choice is different to the one taken in [29,31] which is based on using the vector form factors, i.e. V − (q 2 ) and V 0 (q 2 ) in the helicity basis.…”

mentioning

confidence: 99%

Reassessing the discovery potential of theB→K*ℓ+ℓ−decays in the

2016

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We critically examine the potential to disentangle Standard Model (SM) and New Physics (NP) in B → K * µ + µ − and B → K * e + e − decays, focusing on (i) the LHCb anomaly, (ii) the search for righthanded currents, and (iii) lepton-universality violation. Restricting ourselves to the large-recoil region, we advocate a parameterisation of the hadronic matrix elements that separates model-independent information about nonperturbative QCD from the results of model calculations. We clarify how to estimate corrections to the heavy-quark limit that would generate a right-handed (virtual) photon in the b → sγ contribution to the decay. We then apply this approach to the discussion of various sets of observables of increasing theoretical cleanness. First, we show that angular observables in the optimized P ( ) i basis are, in general, still not robust against the long-distance QCD effects, both numerically and by examining analytically the dependence on corrections to the (model-independent) heavy-quark limit. As a result, while a fit to data favours a NP contribution to the semileptonic operators of the type δC 9 −1.5, this comes at a relatively small statistical significance of 2σ, once such power corrections are properly accounted for. Second, two of these observables, P 1 and P CP 3 are particularly clean at very low q 2 and sensitive probes of right-handed quark currents. We discuss their potential to set stringent bounds on the Wilson coefficient C 7 , especially using data of the electronic mode, and we update the bounds with current angular data in the muonic channel. Finally, in light of the recent hint of lepton-universality violation in B + → K + , we introduce and investigate new lepton-universality observables involving angular observables of the muonic and electronic modes and their zero crossings, and show that, if the effect is of the size suggested by experiment, these can clearly distinguish between different NP explanations in terms of underlying semileptonic operators.

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Exploring new physics in the C 7-C 7′ plane

Cited by 87 publications

References 99 publications

On the impact of power corrections in the prediction of B → K *μ+μ− observables

On the impact of power corrections in the prediction of B → K *μ+μ− observables

Future prospects for the determination of the Wilson coefficient $ C_{{^{{7\gamma }}}}^{\prime } $

Reassessing the discovery potential of theB→K*ℓ+ℓ−decays in the

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