Improved approach to the heavy-to-light form factors in the light-cone QCD sum rules

Huang, Tao; Li, Zuo-Hong; Wu, X.

doi:10.1103/physrevd.63.094001

Cited by 63 publications

(50 citation statements)

References 18 publications

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“…The TFF f B! þ is the key factor of the process, which has been deeply investigated by using several approaches, such as the pQCD approach [28,29], the QCD LCSR approach [23][24][25]27,[30][31][32][33][34][35][36], and the lattice QCD approach [37,38]. Different approaches are applicable for different energy regions.…”

Section: Determination Of Da From B=d ! Transition Form Factorsmentioning

confidence: 99%

“…Here we adopt the chiral correlator suggested in Ref. [31] for our discussion, in which the leading-twist DA's contribution has been amplified in order to provide us with a better chance to know the detail of the leading-twist DA in comparison with data. By using the chiral correlator, up to twist-4, the form factor f B!…”

Section: Determination Of Da From B=d ! Transition Form Factorsmentioning

confidence: 99%

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Determination of the pion distribution amplitude

2013

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Right now, we have not enough knowledge to determine the hadron distribution amplitudes (DAs) which are universal physical quantities in the high energy processes involving hadron for applying pQCD to exclusive processes. Even for the simplest pion, one can't discriminate from different DA models. Inversely, one expects that processes involving pion can in principle provide strong constraints on the pion DA. For example, the pion-photon transition form factor (TFF) can get accurate information of the pion wave function or DA, due to the single pion in this process. However, the data from Belle and BABAR have a big difference on TFF in high $Q^2$ regions, at present, they are helpless for determining the pion DA. At the present paper, we think it is still possible to determine the pion DA as long as we perform a combined analysis of the most existing data of the processes involving pion such as $\pi \to \mu \bar{\nu}$, $\pi^0 \to \gamma \gamma$, $B\to \pi l \nu$, $D \to \pi l \nu$, and etc. Based on the revised light-cone harmonic oscillator model, a convenient DA model has been suggested, whose parameter $B$ which dominates its longitudinal behavior for $\phi_{\pi}(x,\mu^2)$ can be determined in a definite range by those processes. A light-cone sum rule analysis of the semi-leptonic processes $B \to \pi l \nu$ and $D \to \pi l \nu$ leads to a narrow region $B = [0.01,0.14]$, which indicate a slight deviation from the asymptotic DA. Then, one can predict the behavior of the pion-photon TFF in high $Q^2$ regions which can be tested in the future experiments. Following this way it provides the possibility that the pion DA will be determined by the global fit finally.Comment: 9 pages, 6 figure

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Section: Determination Of Da From B=d ! Transition Form Factorsmentioning

confidence: 99%

Section: Determination Of Da From B=d ! Transition Form Factorsmentioning

confidence: 99%

Determination of the pion distribution amplitude

2013

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“…In the case of the scalar mesons, the probe into the twist-2 and -3 DA's has been conducted in the framework of QCD sum rules and a DA model, in an expansion form in the Gegenbauer polynomials, has been formulated, but with a sizable error in some of the model parameters. To try our best to reduce uncertainty in LCSR calculation from the long distance parameters, a practical improvement scenario has been worked out with its validity examined and confirmed, in which a chiral correlator is so chosen that the twist-3 DA's make no contribution [3]. In the present work, we intend to apply the same trick to revaluate the semileptonic transitions B (s) → Slν l , Sll, in the two quark picture for the scalar mesons.…”

Section: Introductionmentioning

confidence: 99%

B(s)→Stransitions in the light cone sum rules with the chiral current

Sun

Huang

2011

Phys. Rev. D

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“…, one can achieve more accurate LCSRs for the TFFs with less uncertain hightwist terms [19]. Even though by using the chiral currents, one may receive additional uncertainties from the scalar (0 + ) B meson resonances, which however can be absorbed into the corresponding hadronic dispersion integral via a proper choice of continuum threshold [14,15].…”

Section: Calculation Technologymentioning

confidence: 99%

The semileptonic decay within the LCSR approach under heavy quark effective field theory *

Zhou

Guo

et al. 2020

Chinese Phys. C

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The heavy quark effective field theory (HQEFT) provides an effective way to deal with the heavy meson decays. In the paper, we adopt two different correlators to derive the light-cone sum rules of the B → π transition form factors (TFFs) within the framework of HQEFT. We label those two LCSR results as LCSR-U and LCSR-R, which are for conventional correlator and right-handed correlator, respectively. We observe that the correlation parameter |ρRU| for the branching ratio B(B → πlν l ) is ∼ 0.85, implying the consistency of the LCSRs under different correlators. Moreover, we obtain |V ub |LCSR−U = (3.45 +0.28 −0.20 ±0.13exp)×10 −3 and |V ub |LCSR−R = (3.38 +0.22 −0.16 ±0.12exp)×10 −3 . We then obtain Rπ|LCSR−U = 0.68 +0.10 −0.09 and Rπ|LCSR−R = 0.65 +0.13 −0.11 , both of them agree with the Lattice QCD predictions. Thus the HQEFT provides a useful framework for studying the B meson decays. Moreover, by using right-handed correlator, the twist-2 terms shall dominant the TFF f + (q 2 ), which approaches over ∼ 97% contribution in the whole q 2 -region; and the large twist-3 uncertainty for the conventional correlator is greatly suppressed. One can thus adopt the LCSR-R prediction to test the properties of the various models for the pion twist-2 distribution amplitudes.

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Improved approach to the heavy-to-light form factors in the light-cone QCD sum rules

Cited by 63 publications

References 18 publications

Determination of the pion distribution amplitude

Determination of the pion distribution amplitude

B(s)→Stransitions in the light cone sum rules with the chiral current

The semileptonic decay within the LCSR approach under heavy quark effective field theory *

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