1 N expansion for exclusive and inclusive charm decays

A. J. Buras; J. M. Gérard; R. Rückl

doi:10.1016/0550-3213(86)90200-2

1 N expansion for exclusive and inclusive charm decays

A. J. Buras, J. M. Gérard, R. Rückl

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316 Scopus citations

Abstract

We systematically apply the 1 N expansion (N being the number of colours) to exclusive and inclusive charm decays and develop a diagrammatic language in which the leading contributions can be clearly identified and calculated. Keeping only the leading terms in 1 N makes the usual approach compatible with the data on exclusive decays and gives τ (D⁺) τ(D⁰) ≈ 02 and B_SL(D⁰) ≈ 10%. 0382 1537 V 3 We also show that the recent analysis of exclusive charm decays of Bauer and Stech can be justified to a certain extent in this approach. The possible non-leading effects are briefly discussed.

Original language	English
Pages (from-to)	16-48
Number of pages	33
Journal	Nuclear Physics, Section B
Volume	268
Issue number	1
DOIs	https://doi.org/10.1016/0550-3213(86)90200-2
State	Published - 28 Apr 1986
Externally published	Yes

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T1 - 1 N expansion for exclusive and inclusive charm decays

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AU - Gérard, J. M.

AU - Rückl, R.

PY - 1986/4/28

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N2 - We systematically apply the 1 N expansion (N being the number of colours) to exclusive and inclusive charm decays and develop a diagrammatic language in which the leading contributions can be clearly identified and calculated. Keeping only the leading terms in 1 N makes the usual approach compatible with the data on exclusive decays and gives τ (D+) τ(D0) ≈ 02 and BSL(D0) ≈ 10%. 0382 1537 V 3 We also show that the recent analysis of exclusive charm decays of Bauer and Stech can be justified to a certain extent in this approach. The possible non-leading effects are briefly discussed.

AB - We systematically apply the 1 N expansion (N being the number of colours) to exclusive and inclusive charm decays and develop a diagrammatic language in which the leading contributions can be clearly identified and calculated. Keeping only the leading terms in 1 N makes the usual approach compatible with the data on exclusive decays and gives τ (D+) τ(D0) ≈ 02 and BSL(D0) ≈ 10%. 0382 1537 V 3 We also show that the recent analysis of exclusive charm decays of Bauer and Stech can be justified to a certain extent in this approach. The possible non-leading effects are briefly discussed.

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1 N expansion for exclusive and inclusive charm decays

Abstract

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