Penguin diagrams, charmlessBdecays, and the 'missing charm puzzle'
| العنوان: | Penguin diagrams, charmlessBdecays, and the 'missing charm puzzle' |
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| المؤلفون: | Gaby Ostermaier, Alexander Lenz, Ulrich Nierste |
| المصدر: | Physical review / D 56(11), 7228-7239 (1997). doi:10.1103/PhysRevD.56.7228 Scopus-Elsevier |
| بيانات النشر: | American Physical Society (APS), 1997. |
| سنة النشر: | 1997 |
| مصطلحات موضوعية: | Quark, Semileptonic decay, Nuclear and High Energy Physics, Particle physics, dipole [quantum chromodynamics], effective Hamiltonian, search for [new interaction], Physics beyond the Standard Model, FOS: Physical sciences, Standard Model, symbols.namesake, High Energy Physics - Phenomenology (hep-ph), charm [quark], inclusive reaction [decay], Feynman diagram, ddc:530, B meson, numerical calculations, Physics, penguin [Feynman graph], CKM matrix matrix, Order (ring theory), decay modes [B], High Energy Physics - Phenomenology, (0charmed particle) [final state], symbols, width [B], Bar (unit) |
| الوصف: | 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. 22 pages, 7 figures, LaTex 2e, uses jeep.sty, a4wide.sty, a4.sty, fancyheadings.sty, cite.sty, epsf.sty, rotate.sty, times.sty. PostScript also available from ftp://feynman.t30.physik.tu-muenchen.de/pub/preprints/tum-hep-274-97.ps.gz |
| تدمد: | 1089-4918 0556-2821 |
| الوصول الحر: | https://explore.openaire.eu/search/publication?articleId=doi_dedup___::e3fec7bbdedf4f5497e200375dd58834Test https://doi.org/10.1103/physrevd.56.7228Test |
| حقوق: | OPEN |
| رقم الانضمام: | edsair.doi.dedup.....e3fec7bbdedf4f5497e200375dd58834 |
| قاعدة البيانات: | OpenAIRE |
| تدمد: | 10894918 05562821 |
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