Chiral extrapolation of lattice data for B-meson decay constant

Guo, Xin-Heng; Weng, Ming-Hua

doi:10.1140/epjc/s10052-006-0187-1

Cited by 11 publications

(6 citation statements)

References 36 publications

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“…Thus evidence for new physics may appear either through enhancements in branching fractions relative to the Standard Model expectation, or through interference effects. Method f B (MeV) HPQCD (unquenched) [188] 216 ± 9 ± 19 ± 4 ± 6 LQCD (chiral extrapolation) [189] 209.4 ± 9.7 ± 1.0 FNAL-MILC-HPQCD [190] 197 ± 6 ± 12 The decay B → τ ν is affected by two quantities of great interest, the quark mixing parameter |V ub | and the pseudoscalar decay constant f B . In fact, the leptonic branching fraction is given by…”

Section: Rare B Decaysmentioning

confidence: 99%

B meson decays

2009

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We discuss the most important Physics thus far extracted from studies of B meson decays. Measurements of the four CP violating angles accessible in B decay are reviewed as well as direct CP violation. A detailed discussion of the measurements of the CKM elements V cb and V ub from semileptonic decays is given, and the differences between resulting values using inclusive decays versus exclusive decays is discussed. Measurements of "rare" decays are also reviewed. We point out where CP violating and rare decays could lead to observations of physics beyond that of the Standard Model in future experiments. If such physics is found by directly observation of new particles, e.g. in LHC experiments, B decays can play a decisive role in interpreting the nature of these particles.

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Section: Rare B Decaysmentioning

confidence: 99%

B meson decays

2009

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“…There has been much theoretical work on the decay constants of the heavy-light mesons, such as the QCD sum rules [2][3][4][5][6][7], the lattice QCD [8][9][10][11][33][34][35][36][37][38], the BetheSalpeter equation [39,40], the relativistic potential model [41][42][43], the field-correlator method [44], the light-front quark model [45][46][47], the chiral extrapolation [48], the extended chiral-quark model [49,50], the constituent quark model [51], etc.…”

Section: Introductionmentioning

confidence: 99%

Analysis of the masses and decay constants of the heavy-light mesons with QCD sum rules

Wang

2015

Eur. Phys. J. C

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In this article, we calculate the contributions of the vacuum condensates up to dimension-6 including the O(α s ) corrections to the quark condensates in the operator product expansion, then we study the masses and decay constants of the pseudoscalar, scalar, vector, and axial-vector heavy-light mesons with the QCD sum rules in a systematic way. The masses of the observed mesonss ) can be well reproduced, while the predictions for the masses of (B * 0 , B 1 ) and (B * s0 , B s1 ) can be confronted with the experimental data in the future. We obtain the decay constants of the pseudoscalar, scalar, vector, and axial-vector heavylight mesons, which have many phenomenological applications in studying the semi-leptonic and leptonic decays of the heavy-light mesons.

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“…MeV (Guo-Weng) [60]. Except of the CP-PACS result with 16% errors, the other calculations contain about 5% uncertainties.…”

Section: B Form Factorsmentioning

confidence: 84%

$B$ to $π$ Form Factors in collinear factorization approach

Yeh

2009

Preprint

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The form factors for semi-leptonic B decays, B → πlν l , are calculated under collinear factorization approach. The end-point divergences are regularized by a ξ-regularization, where ξ means the collinear fraction of the spectator anti-quark of the B meson. The form factors are calculated up-to O(α s /m B ). The complete O(1/m B ) contributions from the π meson are calculated explicitly by a collinear expansion method. A well-defined power expansion scheme is built such that the O(1/m B ) contributions are about 30% of the leading order contributions. A small value F + (0) = 0.164 is found. This confirms the SCET result F + (0) = 0.17 from B → ππ decays. The form factors are calculated for 0 ≤ q 2 ≤ 16 GeV 2 , where q 2 is the invariant mass of the lepton pair in B → πlν l . An extrapolation of the form factors to q 2 > 16 GeV 2 is made to obtain |V ub | −2 ¡ 26.42 GeV 2 0 dq 2 (dΓ/dq 2 ) th = (5.71 ± 0.91)ps −1 . We determine |V ub | = (3.95 ± 0.13 exp ± 0.32 th ) × 10 −3 from the world averaged branching ratio Br( B → πlν l ) = (1.36 ± 0.09) × 10 −4 .

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Chiral extrapolation of lattice data for B-meson decay constant

Cited by 11 publications

References 36 publications

B meson decays

B meson decays

Analysis of the masses and decay constants of the heavy-light mesons with QCD sum rules

$B$ to $π$ Form Factors in collinear factorization approach

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