Semileptonic decays B
                    <sub>c</sub>
                    → (η
                    <sub>c</sub>
                    , J/Ψ)lν in the perturbative QCD approach

Wang, Wen-Fei; Fan, Ying-Ying; Xiao, Z. J.

doi:10.1088/1674-1137/37/9/093102

Cited by 111 publications

(107 citation statements)

References 46 publications

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“…In the b → c ν mediated transitions, ratio of B → D ( * ) ν a e-mail: diganta99@gmail.com decay involving τ leptons over light leptons has been measured by BaBar [10,11], Belle [12][13][14] and LHCb [15,16] which deviate from the SM predictions [17,18] by about 2-3σ with a combined deviation of ≈ 4σ . Similar deviations from the SM prediction in B + → J/ψ + ν decay [19,20] has also been observed in the recent LHCb measurement [21] where the deviation from the SM value is 1.7σ . These deviations, though statistically small and unable to provide unambiguous signal of New Physics (NP) can not be completely ignored.…”

Section: Introductionsupporting

confidence: 85%

Model independent new physics analysis in $$\Lambda _b\rightarrow \Lambda \mu ^+\mu ^-$$ Λ b → Λ μ + μ - decay

Das

2018

Eur. Phys. J. C

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We study the rare b → μ + μ − decay in the Standard Model and beyond. Beyond the Standard Model we include new vector and axial-vector operators, scalar and pseudo-scalar operators, and tensor operators in the effective Hamiltonian. Working in the helicity basis and using appropriate parametrization of the b → hadronic matrix elements, we give expressions of hadronic and leptonic helicity amplitudes and derive expression of double differential branching ratio with respect to dilepton invariant mass squared and cosine of lepton angle. Appropriately integrating the differential branching ratio over the lepton angle, we obtain the longitudinal polarization fraction and the leptonic forward-backward asymmetry and sequentially study the observables in the presence of the new couplings. To analyze the implications of the new vector and axial-vector couplings, we follow the current global fits to b → sμ + μ − data. While the impacts of scalar couplings can be significant, exclusiveB → X s μ + μ − data imply stringent constraints on the tensor couplings and hence the effects on b → μ + μ − are negligible.

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Section: Introductionsupporting

confidence: 85%

Model independent new physics analysis in $$\Lambda _b\rightarrow \Lambda \mu ^+\mu ^-$$ Λ b → Λ μ + μ - decay

Das

2018

Eur. Phys. J. C

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“…Very recently, LHCb measured the ratio of branching ratio R J=ψ to be 0.71 AE 0.17 AE 0.18 [45]. Comparing with the SM prediction [46][47][48], we find the deviation to be at more than 2σ. Although a precise calculation of B c → J=Ψ form factors is not available at present, preliminary results for the form factors are provided by the HPQCD Collaboration using lattice QCD [49].…”

Section: Introductionmentioning

confidence: 52%

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

Dutta

Rajeev

2018

Phys. Rev. D

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Deviation from the standard model prediction is observed in many semileptonic B decays mediated via b → c charged current interactions. In particular, current experimental measurements of the ratio of branching ratio R D and R D Ã in B → D ðÃÞ lν decays disagree with standard model expectations at the level of about 4.1σ. Moreover, the recent measurement of the ratio of branching ratio R J=Ψ by LHCb, where R J=Ψ ¼ BðB c → J=ΨτνÞ=BðB c → J=ΨμνÞ, is more than 2σ away from the standard model prediction. In this context, we consider an effective Lagrangian in the presence of vector and scalar new physics couplings to study the implications of R D and R D Ã anomalies in B s → D s τν decays. We give a prediction of several observables such as the branching ratio, ratio of branching ratio, forward backward asymmetry parameter, τ polarization fraction, and convexity parameter for the B s → D s τν decays within the standard model and within various new physics scenarios.

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“…The functions h 1 and h 2 , the scales t 1 , t 2 and the Sudakov factors S ab are the same as those given in Refs. [18,19]. The expressions of form factors V (q 2 ), A 0,1,2 (q 2 ) and T 1,2,3 (q 2 ) for the B c → D * (s) transition in the pQCD approach are:…”

Section: Form Factors Of Semileptonic Decaysmentioning

confidence: 99%

“…With the form factors calculated in Eqs. (18,19,(21)(22)(23)(24), one can easily get the differential decay width expression for B …”

Section: Form Factors Of Semileptonic Decaysmentioning

confidence: 99%

Semileptonic decaysBc+→D(s)(*
Wang¹,
Yu²,
Lü³
et al. 2014
Phys. Rev. D
Self Cite
263
21
408
1
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In this paper we study the semileptonic decays of B + c → D(s) (l + ν l , l + l − , νν) (here l stands for e, µ, or τ ). After evaluating the B + c → (D (s) , D * (s) ) transition form factors F 0,+,T (q 2 ) and V (q 2 ), A 0,1,2 (q 2 ), T 1,2,3 (q 2 ) by employing the perturbative QCD factorization approach, we calculate the branching ratios for all these semileptonic decays. Our predictions for the values of the B + c → D (s) and B + c → D * (s) transition form factors are consistent with those obtained by using other methods. The branching ratios of the decay modes withνν are almost an order of magnitude larger than the corresponding decays with l + l − after the summation over the three neutrino generations. The branching ratios for the decays with b → d transitions are much smaller than those decays with the b → s transitions, due to the Cabibbo-Kobayashi-Maskawa suppression. We define ratios R D and R D * for the branching ratios with the τ lepton versus µ, e lepton final states to cancel the uncertainties of the form factors, which could possibly be tested in the near future.

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Semileptonic decays B _c → (η _c , J/Ψ)lν in the perturbative QCD approach

Abstract: Semileptonic decays B c →(η c , J/Ψ)lν in the perturbativeQCD approach * WANG Wen-Fei( ) FAN Ying-Ying( ) XIAO Zhen-Jun( ) 1)

Cited by 111 publications

References 46 publications

Model independent new physics analysis in $$\Lambda _b\rightarrow \Lambda \mu ^+\mu ^-$$ Λ b → Λ μ + μ - decay

Model independent new physics analysis in $$\Lambda _b\rightarrow \Lambda \mu ^+\mu ^-$$ Λ b → Λ μ + μ - decay

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

Semileptonic decaysBc+→D(s)(*
Wang¹,
Yu²,
Lü³
et al. 2014
Phys. Rev. D
Self Cite
263
21
408
1
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Semileptonic decays B c → (η c , J/Ψ)lν in the perturbative QCD approach

Abstract: Semileptonic decays B c →(η c , J/Ψ)lν in the perturbativeQCD approach * WANG Wen-Fei( ) FAN Ying-Ying( ) XIAO Zhen-Jun( ) 1)

Cited by 111 publications

References 46 publications

Model independent new physics analysis in $$\Lambda _b\rightarrow \Lambda \mu ^+\mu ^-$$ Λ b → Λ μ + μ - decay

Model independent new physics analysis in $$\Lambda _b\rightarrow \Lambda \mu ^+\mu ^-$$ Λ b → Λ μ + μ - decay

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

Semileptonic decaysBc+→D(s)(*Wang1, Yu2, Lü3 et al. 2014Phys. Rev. DSelf Cite263214081View full textAdd to dashboardCite

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Semileptonic decays B _c → (η _c , J/Ψ)lν in the perturbative QCD approach

Semileptonic decaysBc+→D(s)(*
Wang¹,
Yu²,
Lü³
et al. 2014
Phys. Rev. D
Self Cite
263
21
408
1
View full text Add to dashboard Cite