Theory determination of (B)over-bar → D(*) l-(ν)over-bar form factors at O(1/mc2)

被引：0

作者：

Bordone, Marzia ^{[1
]}

Jung, Martin ^{[2
,3
,4
]}

van Dyk, Danny ^{[5
]}

机构：

[1] Univ Siegen, Walter Flex Str 3, D-57072 Siegen, Germany

[2] Tech Univ Munich, Excellence Cluster Universe, Boltzmannstr 2, D-85748 Garching, Germany

[3] Univ Torino, Dipartimento Fis, I-10125 Turin, Italy

[4] INFN, Sez Torino, I-10125 Turin, Italy

[5] Tech Univ Munich, James Franck Str 1, D-85748 Garching, Germany

来源：

EUROPEAN PHYSICAL JOURNAL C | 2020年 / 80卷 / 02期

关键词：

CB-VERTICAL-BAR; MODEL-INDEPENDENT EXTRACTION; POWER CORRECTIONS;

D O I：

10.1140/epjc/s10052-020-7616-4

中图分类号：

O412 [相对论、场论]; O572.2 [粒子物理学];

学科分类号：

摘要：

We carry out an analysis of the full set of ten B. D(*) form factors within the framework of the HeavyQuark Expansion (HQE) to orderO as, 1/mb, 1/m2c, both with and without the use of experimental data. This becomes possible due to a recent calculation of these form factors at and beyond the maximal physical recoil using QCD lightcone sum rules, in combination with constraints from lattice QCD, QCDthree-point sum rules and unitarity. We find good agreement amongst the various theoretical results, as well as between the theoretical results and the kinematical distributions in <overline> B. D(*){e-, mu-} <overline>. measurements. The coefficients entering at the 1/m2c level are found to be of O(1), indicating convergence of the HQE. The phenomenological implications of our study include an updated exclusive determination of |Vcb| in the HQE, which is compatible with both the exclusive determination using the BGL parametrization and with the inclusive determination. We also revisit predictions for the lepton-flavour universality ratios RD(*), the t polarization observables PD(*) t, and the longitudinal polarization fraction FL. Posterior samples for the HQE parameters are provided as ancillary files, allowing for their use in subsequent studies.

引用

页数：13

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