Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2001-11-29
Phys.Lett.B526:345-354,2002; Erratum-ibid.B601:236-237,2004
Physics
High Energy Physics
High Energy Physics - Phenomenology
14 pages
Scientific paper
10.1016/S0370-2693(01)01517-9
We calculate heavy quark symmetry breaking in the slopes and curvatures of the $B\to D^{(*)}\ell\bar\nu$ spectra at zero recoil, including the order $\alpha_s^2\beta_0$ corrections. We point out that the theoretical uncertainties in the differences between $B\to D$ and $B\to D^*$ slopes and curvatures are smaller than in the deviations of the slopes and curvatures themselves from their infinite mass limits. We find that the central values of the current experimental results for the difference of the slopes differ from our calculations when QCD sum rules are used to estimate subleading Isgur-Wise functions. A better understanding of the shapes of the $B\to D^{(*)}\ell\bar\nu$ spectra may also help to reduce the error of $|V_{cb}|$ extracted from the zero recoil limit of $B\to D^*\ell\bar\nu$. We argue that heavy quark symmetry requires that the same fitting procedure be used in the experimental determinations of the shape parameters and $|V_{cb}|$ from the $B\to D\ell\bar\nu$ and $B\to D^{*}\ell\bar\nu$ spectra.
Grinstein Benjamin
Ligeti Zoltan
No associations
LandOfFree
Heavy quark symmetry in B -> D(*) ell nu spectra does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Heavy quark symmetry in B -> D(*) ell nu spectra, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Heavy quark symmetry in B -> D(*) ell nu spectra will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-177141