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The Isgur-Wise function in the BPS limit
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hep-ph
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functionlimitisgur-wiseamplitudeattainsboundcompletelydemonstrate
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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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