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Dutta, Rupak; Bhol, Anupama

doi:10.1103/physrevd.96.076001

Cited by 87 publications

(65 citation statements)

References 97 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: 58%

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: 58%

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, the LHCb Collaboration [4] has measured the value of the ratio of the branching ratios R J=Ψ ¼ BðB c → J=ΨτνÞ=BðB c → J=ΨμνÞ to be 0.71 AE 0.17 AE 0.18. Comparing this measured value with the SM prediction [5][6][7], we find the discrepancy to be more than 2σ.…”

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confidence: 51%

Phenomenology of Ξb→Ξcτν decays

Dutta¹

2018

Phys. Rev. D

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Deviations from the standard model prediction have been reported in various semileptonic B decays mediated via b → c charged-current interactions. In this context, we analyze corresponding semileptonic baryon decays Ξ b → Ξ c τν using the helicity formalism. We report numerical results on various observables such as the decay rate, ratio of branching ratios, lepton-side forward-backward asymmetry, longitudinal polarization fraction of the charged lepton, and the convexity parameter for this decay mode using results from the relativistic quark model. We also provide an estimate of the new physics effect on these observables under various new physics scenarios.

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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: 77%

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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Bc→(J/Ψ,ηc)τ

Cited by 87 publications

References 97 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

Phenomenology of Ξb→Ξcτν decays

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

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