Signature of lepton flavor universality violation in 
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 semileptonic decays

Dutta, Rupak; Rajeev, N.

doi:10.1103/physrevd.97.095045

Cited by 20 publications

(11 citation statements)

References 71 publications

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“…Starting from the decay B → D * ν , the authors of Ref. [85] also discussed the corresponding strange quark partner, B s → D s τ ν τ , which is also investigated by us. Very recently, B * → (D, D s , π, K ) ν is also discussed for probing the New Physics effects [86].…”

Section: A L = Sin α a A Q + Cos α A A S mentioning

confidence: 99%

Semileptonic B and $$B_s$$ B s decays involving scalar and axial-vector mesons

et al. 2018

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We report our theoretical calculations on the branching fractions for the semileptonic B and B s decays based on the form factors in the covariant light-front quark model. That is, B(B s) → (P, V, S, A) ν , where P and V denote the pseudoscalar and vector mesons, respectively, while S denotes the scalar meson with mass above 1 GeV and A the axial-vector meson. The branching fractions for the semileptonic B → P and V modes have been measured very well in experiment and our theoretical values are in good agreement with them. The ones for B → S and A modes are our theoretical predictions. There is little experimental information on the semileptonic B s decays although much theoretical effort has been done. In addition, we predict the branching fractions of B → D * 0 (2400) ν and B s → D * − s0 (2317) ν as (2.31 ± 0.25) × 10 −3 and (3.07±0.34)×10 −3 , in order, assuming them as the conventional mesons with quark-antiquark configuration. The high luminosity e + e − collider SuperKEKB/Belle-II is running, with the data sample enhanced by a factor of 40 compared to Belle, which will provide huge opportunity for the test of the theoretical predictions and further help understand the inner structure of these scalar and axial-vector mesons, e.g., the glueball content of f 0 (1710) and the mixing angles for the axial-vector mesons. These decay channels can also be accessed by the LHCb experiment.

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Section: A L = Sin α a A Q + Cos α A A S mentioning

confidence: 99%

Semileptonic B and $$B_s$$ B s decays involving scalar and axial-vector mesons

et al. 2018

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“…[9,17,18] considered the interpretation of the data in terms of the type-II two-Higgs doublet model (2HDM) and found it to be inconsistent with the data. On the other hand, besides a plethora of model-independent analysis of the present anomaly [19][20][21][22][23][24][25][26][27][28][29][30][31], one can find in the literature potential explanations in terms of W vector bosons [32][33][34], composite states [35,36], and Frogatt-Nielson-type models [37]. Alternatively, a number of authors have considered leptoquarks as a potential source for the anomaly [38][39][40][41][42][43][44][45][46][47][48][49][50][51][52][53][54].…”

Section: Introductionmentioning

confidence: 99%

Constraining the minimal flavor violating leptoquark explanation of the RD(*) anomaly

2019

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There has been persistent disagreement between the Standard Model (SM) prediction and experimental measurements of R D ( * ) = B(B → D ( * ) τντ )/B(B → D ( * ) lν l ) (l = e, µ). This anomaly may be addressed by introducing interactions beyond the Standard Model involving new states, such as leptoquarks. Since the processes involved are quark flavor changing, any new states would need to couple to at least two different generations of quarks, requiring a non-trivial flavor structure in the quark sector while avoiding stringent constraints from flavor-changing neutral current processes. In this work, we look at scalar leptoquarks as a possible solution for the R D ( * ) anomaly under the assumption of minimal flavor violation (MFV). We investigate all possible representations for the leptoquarks under the SM quark flavor symmetry group, consistent with asymptotic freedom. We consider constraints on their parameter space from self-consistency of the MFV scenario, perturbativity, the FCNC decay b → sνν and precision electroweak observables. We find that none of the scalar leptoquarks can explain the R D ( * ) anomaly while simultaneously avoiding all constraints within this scenario. Thus scalar leptoquarks with MFV-generated quark couplings do not work as a solution to the R D ( * ) anomaly.

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“…TABLE II. The theoretical predictions (in unit of 10 −2 ) for the branching ratios of the considered semileptonic decays of B 0 s meson with l = (e, µ) obtained by using various theoretical approaches [44,[70][71][72][73][74][75][76]. Following the same procedure as we did for B s decays, we can calculate the branching ratios and the ratios R(D ( * ) ) for B → (D, D * )(l + ν l , τ + ν τ ) decays by employing the PQCD and the "PQCD+Lattice" approaches, respectively.…”

Section: B Branching Ratios and The Ratio Of Brsmentioning

confidence: 99%

“…The theoretical predictions for the ratios R(D s ) and R(D * s ) obtained by using the various theoretical approaches[44,[71][72][73]76].…”

mentioning

confidence: 99%

Semileptonic decays $B/B_s \to (D^{()},D_s^{()}) l ν_l$ in the PQCD approach with the lattice QCD input

Hu,

Jin,

Xiao

2019

Preprint

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In this paper, we studied the semileptonic B/B s → (D ( * ) , D ( * ) s )lν l decays in the framework of the standard model (SM) , by employing the perturbative QCD (PQCD) factorization formalism combining with the lattice QCD inputs of the relevant transition form factors. We calculated the branching ratios B(B (s) → D ( * ) (s) lν l ) with l = (e, µ.τ ) , the ratios of the branching ratios R(D ( * ) ) and R(D ( * ) s ) and other physical observables P τ (D ( * ) (s) ), F L (D * (s) ) and A F B (τ ).The "PQCD+Lattice" predictions for B(B → D ( * ) lν l ) and R(D ( * ) ) do agree well with those currently available experimental measurements within the errors. For the ratios R(D s ) and R(D * s ), the "PQCD+Lattice" predictions agree well with other known predictions. For both P τ (D * ) and F L (D * ), our theoretical predictions agree well with the measured values within errors. Our theoretical predictions about the considered semileptonic B/B s decays could be tested in the near future LHCb and the Belle II experiments.

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Signature of lepton flavor universality violation in Bs→Dsτν semileptonic decays

Cited by 20 publications

References 71 publications

Semileptonic B and $$B_s$$ B s decays involving scalar and axial-vector mesons

Semileptonic B and $$B_s$$ B s decays involving scalar and axial-vector mesons

Constraining the minimal flavor violating leptoquark explanation of the RD(*) anomaly

Semileptonic decays $B/B_s \to (D^{()},D_s^{()}) l ν_l$ in the PQCD approach with the lattice QCD input

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Signature of lepton flavor universality violation in Bs→Dsτν semileptonic decays

Cited by 20 publications

References 71 publications

Semileptonic B and $$B_s$$ B s decays involving scalar and axial-vector mesons

Semileptonic B and $$B_s$$ B s decays involving scalar and axial-vector mesons

Constraining the minimal flavor violating leptoquark explanation of the RD(*) anomaly

Semileptonic decays $B/B_s \to (D^{(*)},D_s^{(*)}) l ν_l$ in the PQCD approach with the lattice QCD input

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Semileptonic decays $B/B_s \to (D^{()},D_s^{()}) l ν_l$ in the PQCD approach with the lattice QCD input