Exclusive semileptonic decays of<i>B</i>mesons into light mesons

Akhoury, Ratindranath; Sterman, George; Yao, Y.

doi:10.1103/physrevd.50.358

Cited by 90 publications

(125 citation statements)

References 57 publications

Supporting

Mentioning

120

Contrasting

Order By: Relevance

“…We emphasize that the double logarithm discussed here for Fig. 4(a) differs from that in [4], which concerns α s ln 2 x 1 . As stated above, Fig.…”

Section: Semileptonic Decaymentioning

confidence: 93%

“…5 in fact contains only the single logarithm α s ln x 1 . The result in [4] might be attributed to an inappropriate collinear approximation. Therefore, the universality of the doublelogarithm resummation indeed holds.…”

Section: Semileptonic Decaymentioning

confidence: 97%

“…5 has been considered as the dominant source of the double logarithm α s ln 2 x 1 associated with Fig. 4(b) [4]. It will be demonstrated explicitly in the Appendix A that Fig.…”

Section: Semileptonic Decaymentioning

confidence: 99%

“…In this region the hard amplitude is characterized by a low scale, such that perturbative expansion in terms of a large coupling constant α s is not self-consistent. More serious end-point singularities, logarithmic and linear, have been observed in the leading-twist (twist-2) and next-to-leading-twist (twist-3) contributions to the B → π transition form factors [3][4][5], respectively.…”

Section: Introductionmentioning

confidence: 99%

“…These double logarithms have been found in the semileptonic decay B → πlν [4] and in the radiative decay B → γlν [6], and resummed. Here we shall give a systematic treatment of this type of double logarithms, which is of the collinear origin, by introducing a quark jet function into PQCD factorization theorem.…”

Section: Introductionmentioning

confidence: 99%

See 4 more Smart Citations

Threshold resummation for exclusiveBmeson decays

2002

Phys. Rev. D

204

223

View full text Add to dashboard Cite

We argue that double logarithmic corrections α s ln 2 x need to be resumed in perturbative QCD factorization theorem for exclusive B meson decays, when the end-point region with a momentum fraction x → 0 is important. These double logarithms, being of the collinear origin, are absorbed into a quark jet function, which is defined by a matrix element of a quark field attached by a Wilson line. The factorization of the jet function from the decay B → γlν is proved to all orders. Threshold resummation for the jet function leads to a universal, i.e., process-independent, Sudakov factor, whose qualitative behavior is analyzed and found to smear the end-point singularities in heavy-to-light transition form factors.

show abstract

“…We emphasize that the double logarithm discussed here for Fig. 4(a) differs from that in [4], which concerns α s ln 2 x 1 . As stated above, Fig.…”

Section: Semileptonic Decaymentioning

confidence: 93%

Section: Semileptonic Decaymentioning

confidence: 97%

“…5 has been considered as the dominant source of the double logarithm α s ln 2 x 1 associated with Fig. 4(b) [4]. It will be demonstrated explicitly in the Appendix A that Fig.…”

Section: Semileptonic Decaymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Threshold resummation for exclusiveBmeson decays

2002

Phys. Rev. D

204

223

View full text Add to dashboard Cite

show abstract

Measurement ofVub

Selen

1996

Nuov Cim A

View full text Add to dashboard Cite

show abstract

Precision calculations of Bd,s → π, K decay form factors in soft-collinear effective theory

Cui

Huang

Shen

et al. 2023

J. High Energ. Phys.

View full text Add to dashboard Cite

We improve QCD calculations of the semileptonic Bd,s→ π, K decay form factors at large hadronic recoil by implementing the next-to-leading-logarithmic resummation for the obtained leading-power light-cone sum rules in the soft-collinear effective theory (SCET) framework and by computing for the first time the non-vanishing spectator-quark mass correction dictating the SU(3)-flavour symmetry breaking effects between these fundamental quantities at the one-loop accuracy. Additionally, we endeavour to investigate a variety of the subleading-power contributions to these heavy-to-light form factors at $$ \mathcal{O}\left({\alpha}_s^0\right) $$ O α s 0 with the same methodology, by including the higher-order terms in the heavy-quark expansion of the hard-collinear quark propagator, by evaluating the desired effective matrix element of the next-to-leading-order term "Image missing" in the SCETI representation of the weak transition current, by taking into account the off-light-cone contributions of the two-body heavy-quark effective theory (HQET) matrix elements as well as the three-particle higher-twist corrections from the subleading bottom-meson light-cone distribution amplitudes (LCDAs), and by computing the twist-five and twist-six four-body higher-twist effects with the aid of the factorization approximation. Having at our disposal the SCET sum rules for the exclusive B-meson decay form factors under discussion, we further explore in detail numerical implications of the newly computed subleading-power corrections by employing the three-parameter model for both the leading-twist and higher-twist B-meson distribution amplitudes. Taking advantage of the customary Bourrely-Caprini-Lellouch (BCL) parametrization for the complete set of the semileptonic Bd,s→ π, K form factors, we then determine the correlated numerical results for the interesting series coefficients, by carrying out the simultaneous fit of the exclusive B-meson decay form factors to both the achieved SCET sum rule predictions at small momentum transfer (q2) and the available lattice QCD results at large momentum transfer. Subsequently, we perform a comprehensive phenomenological analysis of the full angular observables, the lepton-flavour university ratios and the lepton polarization asymmetries for the flavour-changing charged- current $$ B\to \pi \ell {\overline{\nu}}_{\ell } $$ B → π ℓ ν ¯ ℓ and $$ {B}_s\to K\ell {\overline{\nu}}_{\ell } $$ B s → K ℓ ν ¯ ℓ decays (with ℓ = μ, τ) together with the differential q2-distribution for the exclusive rare $$ B\to K{\nu}_{\ell }{\overline{\nu}}_{\ell } $$ B → K ν ℓ ν ¯ ℓ decays in the Standard Model.

show abstract

Exclusive semileptonic decays ofBmesons into light mesons

Cited by 90 publications

References 57 publications

Threshold resummation for exclusiveBmeson decays

Threshold resummation for exclusiveBmeson decays

Measurement ofVub

Precision calculations of Bd,s → π, K decay form factors in soft-collinear effective theory

Contact Info

Product

Resources

About