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02 November 2024 |
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Article overview
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Systematic errors of transition form factors extracted by means of light-cone sum rules | Wolfgang Lucha
; Dmitri Melikhov
; Silvano Simula
; | Date: |
2 Dec 2007 | Abstract: | This talk presents results of our study of heavy-to-light transition form
factors extracted with the help of light-cone sum rules. We employ a model with
scalar particles interacting via massless-boson exchange and study the
heavy-to-light correlator, relevant for the extraction of the transition form
factor. We calculate this correlator in two different ways: by making use of
the Bethe-Salpeter wave function of the light bound state and by making use of
the light-cone expansion. This allows us to calculate the full correlator and
separately the light-cone contribution to it. In this way we show that the
off-light cone contributions are not suppressed compared to the light-cone one
by any large parameter. Numerically, the difference between the value of the
form factor extracted from the full correlator and from the light-cone
contribution to this correlator is found to be about 20-30% in a wide range of
masses of the particles involved in the decay process. | Source: | arXiv, 0712.0178 | Services: | Forum | Review | PDF | Favorites |
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