Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
1994-05-18
Phys.Lett.B348:207-212,1995
Physics
High Energy Physics
High Energy Physics - Phenomenology
10 pages, 3 figures (ps file available upon request), RAL-94-041, OUTP-94 09P
Scientific paper
10.1016/0370-2693(95)00118-5
Recently we have shown that due account of Wigner spin rotations is needed to match the ISGW model consistently onto HQET. We now discuss the flavour dependence of this procedure. We find that for finite mass ``heavy'' quark the universal function $\xi(y=1) \approx 1$ but the slope is proportional to the energy of the spectator quarks, and ratios of form factors are corrected in a way that QCD sum rules seem to require. Predictions for heavy quarks, such as in $B_c \rightarrow \psi(\eta_c)$ and to mixed systems, such as $D\rightarrow K$ and $B \rightarrow \pi$ show a systematic mass dependence that may be confronted with data.
Close Frank E.
Wambach A.
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