Penguin diagrams, charmlessBdecays, and the 'missing charm puzzle'
| ISSN: | 1089-4918 0556-2821 |
|---|---|
| DOI: | 10.1103/physrevd.56.7228 |
| DOI: | 10.1103/PhysRevD.56.7228 |
| Přístupová URL adresa: | https://explore.openaire.eu/search/publication?articleId=doi_dedup___::e3fec7bbdedf4f5497e200375dd58834 https://doi.org/10.1103/physrevd.56.7228 |
| Rights: | OPEN |
| Přírůstkové číslo: | edsair.doi.dedup.....e3fec7bbdedf4f5497e200375dd58834 |
| Autor: | Gaby Ostermaier, Alexander Lenz, Ulrich Nierste |
| Rok vydání: | 1997 |
| Předmět: |
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) |
| Zdroj: | Physical review / D 56(11), 7228-7239 (1997). doi:10.1103/PhysRevD.56.7228 Scopus-Elsevier |
| ISSN: | 1089-4918 0556-2821 |
| DOI: | 10.1103/physrevd.56.7228 |
| Popis: | 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 |
| Databáze: | OpenAIRE |
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