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The Isgur-Wise function in the BPS limit

F. Jugeau·A. Le Yaouanc·L. Oliver·J. -C. Raynal
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Abstract

From sum rules in the heavy quark limit of QCD, using the non-forward amplitude, we demonstrate that if the slope rho^2 = -xsi'(1) of the Isgur-Wise function xsi(w) attains its lower bound 3/4 (as happens in the BPS limit proposed by Uraltsev), the IW function is completely determined, given by the function xsi(w) = [2/(w+1)]^(3/2).

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F. Jugeau, A. Le Yaouanc, L. Oliver, J. -C. Raynal. 2006-11-02. The Isgur-Wise function in the BPS limit. https://arxiv.org/abs/hep-ph/0611031

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