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

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

2005-11-14

arxiv.org/abs/hep-ph/0511158v2

Eur.Phys.J.C50:539-556,2007

Physics

High Energy Physics

High Energy Physics - Phenomenology

32 pages, LaTeX, 3 figures. Revised: A number of inconsistencies and typos corrected including the $1/m_c^2$ matrix elements.

Scientific paper

10.1140/epjc/s10052-007-0216-8

We 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 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 \Gamma_{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.

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