Analysis of the photon spectrum in inclusivedecays
- 1 May 1994
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review D
- Vol. 49 (9), 4623-4633
- https://doi.org/10.1103/physrevd.49.4623
Abstract
Using a combination of the operator product and heavy quark expansions, we resum the leading nonperturbative contributions to the inclusive photon spectrum in decays. The shape of the spectrum is determined by a universal structure function, which describes the distribution of the light-cone momentum of the quark inside the meson. The moments of this function are proportional to forward matrix elements of higher-dimension operators. As a by-product, we obtain the bound for one of the parameters of the heavy quark effective theory. An integral over the structure function is related to the shape function that governs the fall off of the lepton spectrum close to the end point in decays. A measurement of the photon spectrum in rare decays can therefore help to obtain a model-independent determination of .
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