Quantitative predictions for<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>B</mml:mi></mml:math>semileptonic decays into<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>D</mml:mi><mml:mo>,</mml:mo></mml:math><mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msup><mml:mrow><mml:mi>D</mml:mi></mml:mrow><mml:mrow><mml:mi>*</mml:mi></mml:mrow></mml:msup></mml:mrow><mml:mo>,</mml:mo></mml:math>and the orbi

Morénas, V.; Yaouanc, A. Le; Oliver, L.; Pène, O.; Raynal, J.

doi:10.1103/physrevd.56.5668

Cited by 88 publications

(151 citation statements)

References 44 publications

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“…Through Eqs. (40,42,43) the form factors h V , h A2 and h A3 can be reconstructed including the NLO 1/m Q and α s corrections, and also B(B 0 → D * + τ −ν ) can be computed. The results are:…”

Section: Exclusive B → C ν Decaysmentioning

confidence: 99%

Anomalous enhancement observed inB→D(*)τν¯τdecays

2013

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The BaBar measurements of the ratios R(D ( * ) ) = B(B→D ( * ) τντ ) B(B→D ( * ) µνµ) deviate from the standard model expectation, while new results on the purely leptonic B → τντ mode show a better consistency with the standard model, within the uncertainties. In a new physics scenario, one possibility to accomodate these two experimental facts consists in considering an additional tensor operator in the effective weak hamiltonian. We study the effects of such an operator in a set of observables, in semileptonic B → D ( * ) modes as well as in semileptonic B and Bs decays to excited positive parity charmed mesons.

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Section: Exclusive B → C ν Decaysmentioning

confidence: 99%

Anomalous enhancement observed inB→D(*)τν¯τdecays

2013

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“…3/2 (w) and τ (0) 1/2 (w) are negative [15]. Namely, a good approximate parametrization of these functions is given by ξ(w) = 2 w + 1 …”

Section: Phenomenological Remarksmentioning

confidence: 99%

Sum rules in the heavy quark limit of QCD

2003

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In the leading order of the heavy quark expansion, we propose a covariant method, within the OPE and the trace formalism, that allows to obtain, in a systematic way, Bjorken-like sum rules for the derivatives of the elastic Isgur-Wise function ξ(w) in terms of corresponding Isgur-Wise functions of transitions to excited states. To illustrate the method, we give a simultaneous derivation of Bjorken and Uraltsev sum rules, with generalizations of the latter for w = 1. On the other hand, we obtain a new class of sum rules that involve the products of IW functions at zero recoil and of IW functions at any w.These sum rules give new information on the slope ρ 2 = −ξ ′ (1) and also on the curvature σ 2 = ξ ′′ (1), and imply, modulo a very natural assumption, the inequality σ 2 ≥ 5 4 ρ 2 , and therefore the absolute bound σ 2 ≥ 15 16 .

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“…obtained approximately within the Bakamjian-Thomas relativistic quark models [7] and from QCD Sum Rules at large recoil [8]. Indeed, one can easily show that the derivatives (−1) ℓ ξ (ℓ)…”

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confidence: 99%

Bounds on the derivatives of the Isgur–Wise function from sum rules in the heavy quark limit of QCD

2003

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Using the OPE and the trace formalism, we have obtained a number of sum rules in the heavy quark limit of QCD that include the sum over all excited states for any value j P of the light cloud. We show that these sum rules imply that the elastic Isgur-Wise function ξ(w) is an alternate series in powers of (w − 1). Moreover, one gets that any n-th derivative of ξ(w) at w = 1 can be bounded by the (n − 1)-th one. For the curvature σ 2 = ξ ′′ (1), this proves the already proposed bound σ 2 ≥ 5 4 ρ 2 . Moreover, we obtain the absolute lower bound for the n-th derivative (−1) n ξ (n) (1) ≥ (2n+1)!! 2 2n , that generalizes the results ρ 2 ≥ 3 4 and σ 2 ≥ 15 16 .

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Quantitative predictions forBsemileptonic decays intoD,D*,and the orbi

Cited by 88 publications

References 44 publications

Anomalous enhancement observed inB→D(*)τν¯τdecays

Anomalous enhancement observed inB→D(*)τν¯τdecays

Sum rules in the heavy quark limit of QCD

Bounds on the derivatives of the Isgur–Wise function from sum rules in the heavy quark limit of QCD

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