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Extraction of the D*Dπ coupling from D* decays

Stewart, Iain W. (1998) Extraction of the D*Dπ coupling from D* decays. Nuclear Physics B, 529 (1-2). pp. 62-80. ISSN 0550-3213. doi:10.1016/S0550-3213(98)00374-5.

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The decays D* → Dπ and D* → Dγ are well described by heavy meson chiral perturbation theory. With the recent measurement of B(D*+ → D+γ), the D*^0, D*+ and D*_S branching fractions can be used to extract the D*Dπ and D*Dγ couplings g and β. The D* → Dγ decays receive important corrections at order √m_q and, from the heavy quark magnetic moment, at order 1/m_c. Here all the decay rates are computed to one loop, to first order in m_q and 1/m_c, including the effect of heavy meson mass splittings, and the counterterms at order m_q. A fit to the experimental data gives two possible solutions, g = 0.27_(−0.02−0.02)^(+0.04+0.05), β= 0.85_(−0.1 − 0.1)^(+0.2 + 0.3) GeV− or g = 0.76_(−0.03 −0.1)^(+0.03+0.2), β = 4.90_(−0.3−0.7)^(+0.3+5.0) GeV^(−1). The first errors are experimental, while the second are estimates of the uncertainty induced by the counterterms. (The experimental limit Γ_D* < 0.13 MeV excludes the g = 0.76 solution.) Predictions for the D* and B* widths are given.

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Additional Information:© 1998 Elsevier B.V. Received 7 April 1998, Accepted 6 May 1998, Available online 4 December 1998.
Issue or Number:1-2
Classification Code:PACS: 11.30.Rd; 12.39.Hg; 13.25.Ft; 13.40.Hq
Record Number:CaltechAUTHORS:20170816-133456679
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Official Citation:Iain W Stewart, Extraction of the D*Dπ coupling from D* decays, Nuclear Physics B, Volume 529, Issues 1–2, 28 September 1998, Pages 62-80, ISSN 0550-3213, (
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:80491
Deposited By: Tony Diaz
Deposited On:16 Aug 2017 21:16
Last Modified:15 Nov 2021 19:36

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