Nonperturbative m_X cut effects in B-->X_sl^+Γ observables
- Creators
- Lee, Keith S. M.
- Tackmann, Frank J.
Abstract
Recently, it was shown that in inclusive B-->X_s[script-l]^+[script-l]Γ decay, an angular decomposition provides three independent (q^2 dependent) observables. A strategy was formulated to extract all measurable Wilson coefficients in B-->X_s[script-l]^+[script-l]Γ from a few simple integrals of these observables in the low q^2 region. The experimental measurements in the low q^2 region require a cut on the hadronic invariant mass, which introduces a dependence on nonperturbative b quark distribution functions. The associated hadronic uncertainties could potentially limit the sensitivity of these decays to new physics. We compute the nonperturbative corrections to all three observables at leading and subleading order in the power expansion in Lambda_(QCD)/m_b. We find that the subleading power corrections give sizeable corrections, of order -5% to -10% depending on the observable and the precise value of the hadronic mass cut. They cause a shift of order -0.05 GeV^2 to -0.1 GeV^2 in the zero of the forward-backward asymmetry.
Additional Information
©2009 The American Physical Society. Received 12 February 2009; published 19 June 2009. We thank Iain Stewart and Zoltan Ligeti for discussions and comments on the manuscript. This work was supported in part by the Office of Nuclear Physics of the U.S. Department of Energy (DOE) under the Contract DEFG02-94ER40818 (F. T.) and in part by the DOE under the Grant DE-FG02-92ER40701 (K. L.). K. L. was also supported by the Sherman Fairchild Foundation.Additional details
- Eprint ID
- 15278
- Resolver ID
- CaltechAUTHORS:20090824-133329813
- DEFG02-94ER40818
- Department of Energy
- DE-FG02-92ER40701
- Department of Energy
- Sherman Fairchild Foundation
- Created
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2009-09-09Created from EPrint's datestamp field
- Updated
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2021-11-08Created from EPrint's last_modified field