4.4 Article

Standard Model prediction of the Bc lifetime

期刊

JOURNAL OF HIGH ENERGY PHYSICS
卷 -, 期 7, 页码 -

出版社

SPRINGER
DOI: 10.1007/JHEP07(2021)130

关键词

QCD Phenomenology

资金

  1. Swiss National Science Foundation [No.P400P2_183838]
  2. U.S. Department of Energy [DE-SC0009919]
  3. Swiss National Science Foundation (SNF) [P400P2_183838] Funding Source: Swiss National Science Foundation (SNF)

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By applying an operator product expansion approach, the authors updated the Standard Model prediction of the B-c lifetime from over 20 years ago. The uncertainties resulting from scale dependence, neglecting the strange quark mass, non-perturbative matrix elements and parametric uncertainties were discussed in detail, however, the resulting uncertainties are still rather large compared to experimental ones.
Applying an operator product expansion approach we update the Standard Model prediction of the B-c lifetime from over 20 years ago. The non-perturbative velocity expansion is carried out up to third order in the relative velocity of the heavy quarks. The scheme dependence is studied using three different mass schemes for the (b) over bar and c quarks, resulting in three different values consistent with each other and with experiment. Special focus has been laid on renormalon cancellation in the computation. Uncertainties resulting from scale dependence, neglecting the strange quark mass, non-perturbative matrix elements and parametric uncertainties are discussed in detail. The resulting uncertainties are still rather large compared to the experimental ones, and therefore do not allow for clear-cut conclusions concerning New Physics effects in the B-c decay.

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