Heavy-to-light correlators beyond the light cone
Journal Article
·
· Physics of Atomic Nuclei
- Austrian Academy of Sciences, Institute for High Energy Physics (Austria)
- Sezione di Roma III, INFN (Italy)
We present the first systematic analysis of the off-light-cone effects in correlators relevant for the extraction of the heavy-to-light form factors within the method of light-cone sum rules. In a model with scalar constituents, the correlator is calculated in two different ways: (i) by performing the expansion of the Bethe-Salpeter amplitude of the light meson near the light cone x{sup 2} = 0 and (ii) by adopting the known solution for the Bethe-Salpeter amplitude which allows one to calculate the correlator without invoking any expansion. We demonstrate that the contributions to the correlator from the off-light-cone terms x{sup 2} {ne} 0 are not suppressed by any large parameter compared to the contribution of the light-cone term x{sup 2} = 0. For decays of heavy particles of mass in the range 1.5-5 GeV, the light-cone correlator is shown to systematically overestimate the full correlator, numerically the difference being 10-20%.
- OSTI ID:
- 22028127
- Journal Information:
- Physics of Atomic Nuclei, Journal Name: Physics of Atomic Nuclei Journal Issue: 3 Vol. 71; ISSN 1063-7788; ISSN PANUEO
- Country of Publication:
- United States
- Language:
- English
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