On the nonperturbative charm effects in inclusive B -> X_c lνdecays

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dc.creatorBigi, I. I.
dc.creatorUraltsev, N.
dc.creatorZwicky, R.
dc.date2005-11-14
dc.date2006-06-17
dc.date.accessioned2026-07-07T11:26:49Z
dc.date.available2026-07-07T11:26:49Z
dc.descriptionWe address the nonperturbative effects associated with soft charm quarks in inclusive B decays. Such corrections are allowed by the OPE, but have largely escaped attention so far. The related four-quark `double heavy' expectation values of the form <B|\bar{b}c \bar{c}b|B> are computed in the 1/m_c expansion by integrating out the charm field to one and two loops. A significant enhancement of the two-loop coefficients has been noted. A method is suggested for evaluating the expectation values of the higher-order b-quark operators required to calculate charm expectation values, free from the overly large ambiguities of dimensional analyses. The soft-charm effects were found generally at the level of 0.5% in Γ_{sl}(b->c); however, as a result of cancellations the net impact should be smaller. We propose a direct way to search for such effects in the data. Finally, we discuss the relation of the soft charm corrections in inclusive decays with the `Intrinsic Charm' ansatz.
dc.description32 pages, LaTeX, 3 figures. Revised: A number of inconsistencies and typos corrected including the $1/m_c^2$ matrix elements. The effect on Γ_sl is estimated about 0.003, not changing the conclusions. A new reference [9] has been added
dc.identifierhttps://arxiv.org/abs/hep-ph/0511158
dc.identifierhttp://arxiv.org/abs/hep-ph/0511158
dc.identifierEur.Phys.J.C50:539-556,2007
dc.identifierdoi:10.1140/epjc/s10052-007-0216-8
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/195954
dc.subjectHigh Energy Physics - Phenomenology
dc.titleOn the nonperturbative charm effects in inclusive B -> X_c lνdecays
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