Probing new physics with 
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Colangelo, P.; Fazio, F. De; Loparco, Francesco

doi:10.1103/physrevd.100.075037

Cited by 26 publications

(26 citation statements)

References 151 publications

(171 reference statements)

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“…The function I ρ 6c , shown for SM and NP in the right panel of Figure 5, is sensitive to V , P , T . Different possibilities can be envisaged [44]:…”

Section: Observables Inb → ρ(ππ) −νmentioning

confidence: 99%

“…Observables inB → ρ(ππ) −ν are studied at a benchmark point in the parameter space of the new effective couplings, scrutinizing their sensitivity to the different operators (Section 5). For the a 1 (1260) mode, analyzed in Section 6, the uncertainties from the form factors are large; nevertheless, also in this channel observables particularly sensitive to New Physics (NP) can be identified [44].…”

Section: Introductionmentioning

confidence: 99%

“…The same expression holds for B s → K * + (Kπ) −ν . The relations of the angular coefficient functions in Equation 5to the hadronic B → ρ matrix elements are collected in Reference [44], obtained in the narrow width approximation which factorizes the production and decay amplitude of the intermediate vector meson. A discussion on this procedure, together with references to studies of non-resonant contributions, can also be found in Reference [44].…”

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confidence: 99%

“…The expressions of the coefficient functions in terms of B → a 1 hadronic matrix elements are in Reference [44]. The separation of the polarizations of the final ρ is justified by the different sensitivity of the distribution to the NP operators.…”

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confidence: 99%

“…In the Large Energy Limit of the light meson, the B → ρ(a 1 ) weak matrix elements can be written in terms of two form factors, ξ ρ ⊥ (ξ a 1 ⊥ ) and ξ ρ (ξ a 1 ) [44]. 6c,⊥ (for transversely polarized ρ).…”

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confidence: 99%

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Probes of Lepton Flavor Universality in b → u Transitions

2020

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Anomalies recently observed in semileptonic b → c ℓ − ν ¯ ℓ and b → s ℓ + ℓ − transitions point to violation of Lepton Flavour Universality. Strategies for new analyses of different modes are required, in particular for the modes induced by the b → u transition. We describe the purely leptonic B decay, the B ¯ → π ℓ − ν ¯ ℓ channel and the B semileptonic modes to ρ ( 770 ) and a 1 ( 1260 ) in extensions of the Standard Model involving Lepton Flavour Universality violating b → u operators. In particular, we review the observables in the four-dimensional angular B ¯ → ρ ( π π ) ℓ − ν ¯ ℓ and B ¯ → a 1 ( ρ π ) ℓ − ν ¯ ℓ distributions, suitable to pin down deviations from the Standard Model. We discuss the complementarity among the various modes for New Physics searches.

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“…The function I ρ 6c , shown for SM and NP in the right panel of Figure 5, is sensitive to V , P , T . Different possibilities can be envisaged [44]:…”

Section: Observables Inb → ρ(ππ) −νmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

mentioning

confidence: 99%

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confidence: 99%

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confidence: 99%

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Probes of Lepton Flavor Universality in b → u Transitions

2020

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Symmetries in B → D∗ℓν angular observables

Algueró

Descotes-Genon

Matias

et al. 2020

J. High Energ. Phys.

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We apply the formalism of amplitude symmetries to the angular distribution of the decays B → D * ν for = e, µ, τ . We show that the angular observables used to describe the distribution of this class of decays are not independent in absence of New Physics contributing to tensor operators. We derive sets of relations among the angular coefficients of the decay distribution for the massless and massive lepton cases which can be used to probe in a very general way the consistency among the angular observables and the underlying New Physics at work. We use these relations to access the longitudinal polarisation fraction of the D * using different angular coefficients from the ones used by Belle experiment. This in the near future can provide an alternative strategy to measure F D * L in B → D * τ ν and to understand the relatively high value measured by the Belle experiment. Using the same symmetries, we identify three observables which may exhibit a tension if the experimental value of F D * L remains high. We discuss how these relations can be exploited for binned measurements. We also propose a new observable that could test for specific scenarios of New Physics generated by light right-handed neutrinos. Finally we study the prospects of testing these relations based on the projected experimental sensitivity of new experiments.

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A closer look at observables from exclusive semileptonic B → (π, ρ)ℓνℓ decays

Biswas

Nandi

2021

J. High Energ. Phys.

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This article analyses the available inputs in B → πℓνℓ and B → ρℓνℓ decays which include the measured values of differential rate in different q2-bins (lepton invariant mass spectrum), lattice, and the newly available inputs on the relevant form-factors from the light-cone sum rules (LCSR) approach. We define different fit scenarios, and in each of these scenarios, we predict a few observables in the standard model (SM). For example, $$ R(M)=\frac{\mathcal{B}\left(B\to M{\ell}_i{\nu}_{\ell_i}\right)}{\mathcal{B}\left(B\to M{\ell}_j{\nu}_{\ell_j}\right)},{R}_{\ell_j}^{\ell_i}(M)=\frac{\mathcal{B}\left(B\to {\ell}_i{\nu}_{\ell_i}\right)}{\mathcal{B}\left(B\to M{\ell}_j{\nu}_{\ell_j}\right)} $$ R M = B B → M ℓ i ν ℓ i B B → M ℓ j ν ℓ j , R ℓ j ℓ i M = B B → ℓ i ν ℓ i B B → M ℓ j ν ℓ j with M = π or ρ and ℓi,j = e, μ or τ. We also discuss the new physics (NP) sensitivities of all these observables and obtain bounds on a few NP Wilson coefficients in b → uτντ decays using the available data. We have noted that the data at present allows sizeable NP contributions in this mode. Also, we have predicted a few angular observables relevant to these decay modes.

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Probing new physics with B¯→ρ(770)ℓ−

Cited by 26 publications

References 151 publications

Probes of Lepton Flavor Universality in b → u Transitions

Probes of Lepton Flavor Universality in b → u Transitions

Symmetries in B → D∗ℓν angular observables

A closer look at observables from exclusive semileptonic B → (π, ρ)ℓνℓ decays

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