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Estimate of the Three-loop Perturbative Contribution to Inclusive Semileptonic B→u Decays by M.R. Ahmady; F.A. Chishtie; V. Elias; T.G. Steele is a Physics and Astronomy article available to read on EtoBox.

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We utilize asymptotic Pade-approximant methods to estimate the three-loop order MS-scheme coefficients within the ý inclusive b TM un l l decay rate for four and five active quark flavours. The estimates we obtain for the three l l renormalization-group-accessible coefficients within the three-loop contribution are all found to be within 5.1% of their true values, using a least-squares procedure in conjunction with an asymptotic Pade-approximant estimate of the three-loop term Ž . Ž . over the entire m G m domain. Given the input values a M s 0.118 " 0.004 and m m s 4.17 " 0.05 GeV, the

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Author

M.R. Ahmady; F.A. Chishtie; V. Elias; T.G. Steele

Publisher

Elsevier Science; Elsevier ; Elsevier BV (ISSN 0370-2693)

Published

2000

Language

EN

Field

Physics and Astronomy (Physical Sciences)