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High Energy Physics - Phenomenology

arXiv:hep-ph/0511158 (hep-ph)
[Submitted on 14 Nov 2005 (v1), last revised 17 Jun 2006 (this version, v2)]

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

Authors:I.I. Bigi, N. Uraltsev, R. Zwicky
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Abstract: 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 <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 \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.
Comments: 32 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
Subjects: High Energy Physics - Phenomenology (hep-ph)
Report number: Bicocca-FT-05-25, CERN-PH-TH/2005-223, UND-HEP-05-BIG06, LPT-ORSAY 05-73, FTPI-MINN-05/18, IPPP/05/62, DCPT/05/124
Cite as: arXiv:hep-ph/0511158
  (or arXiv:hep-ph/0511158v2 for this version)
  https://doi.org/10.48550/arXiv.hep-ph/0511158
Journal reference: Eur.Phys.J.C50:539-556,2007
Related DOI: https://doi.org/10.1140/epjc/s10052-007-0216-8

Submission history

From: Nikolai Uraltsev [view email]
[v1] Mon, 14 Nov 2005 16:59:14 UTC (46 KB)
[v2] Sat, 17 Jun 2006 17:18:51 UTC (47 KB)
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