Penguin Diagrams, Charmless B-Decays and the ``Missing Charm Puzzle''

Details Penguin Diagrams, Charmless B-Decays and the ``Missing Charm Puzzle'' Penguin Diagrams, Charmless B-Decays and the ``Missing Charm Puzzle''

1997-06-25

arxiv.org/abs/hep-ph/9706501v1

Phys.Rev. D56 (1997) 7228-7239

Physics

High Energy Physics

High Energy Physics - Phenomenology

22 pages, 7 figures, LaTex 2e, uses jeep.sty, a4wide.sty, a4.sty, fancyheadings.sty, cite.sty, epsf.sty, rotate.sty, times.sty

Scientific paper

10.1103/PhysRevD.56.7228

We calculate the contributions of penguin diagrams with internal u or c quarks to various inclusive charmless B-decay rates. Further we analyze the influence of the chromomagnetic dipole operator Q_8 on these rates. We find that the rates corresponding to B-bar --> X_{u u-bar s}, B-bar --> X_{d d-bar s}, B-bar --> X_{s s-bar s}, B-bar --> X_{s s-bar d} and B --> X_{d d-bar d} are dominated by the new penguin contributions. The contributions of Q_8 sizably diminish these rates. Despite of an increase of the total charmless decay rate by 36 % the new contributions are not large enough to explain the charm deficit observed by ARGUS and CLEO. We predict n_c=1.33 +/- 0.06 for the average number of charmed particles per B-decay in the Standard Model. Then the hypothesis of an enhancement of the chromomagnetic dipole coefficient C_8 by new physics contributions is analyzed. We perform a model independent fit of C_8 to the experimental data. If the CKM structure of the new physics contribution is the same as in the Standard Model, |C_8(M_W)| must be enhanced by a factor of 9 to 16 in order to explain the observed charm deficit.

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