DOI 10.1007/s100529800783
The hadronic recoil mass spectrum in semileptonic
B decays
and
extracting |Vub| in a
model-insensitive way
I. Bigi1 - R.D. Dikeman2 - N. Uraltsev2,3
1 Department of Physics,
University of Notre Dame du
Lac, Notre Dame, IN 46556, USA
2 Theoretical Physics Institute, University of Minnesota,
Minneapolis, MN 55455
3 St.Petersburg Nuclear Physics Institute,
Gatchina, St.Petersburg 188350, Russia
Received: 30 July 1997 / Published online: 23 February 1998
Abstract
We present an extended discussion of the previously noted possibility to
extract |Vub| from an analysis of the hadronic recoil mass
spectrum in decays. Invariant mass spectra
containing perturbative as well as nonperturbative corrections are
given; their shape is manifestly sensitive to the three basic
quantities
, mb and
, whereas the total
integrated rate is much less so. Only a small fraction of
transitions generates a recoil mass MX of at least MD. Moreover
we find that the fraction of events with
(to
reject leakage from
due to measurement errors) exhibits
fairly little dependence on
, mb and
;|Vub| can then be extracted in a largely model-insensitive way.
This conclusion is based on the applicability of the OPE
to actual semileptonic B decays. A direct cross-check of
this assumption and a determination of the required basic parameters
of the heavy quark expansion will be possible in the future with more
experimental data.
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