Heavy-to-light chromomagentic matrix element

Maria Dimou, James Lyon, Roman Zwicky

Research output: Contribution to journalArticlepeer-review

Abstract

We report the computation of the matrix element of the chromomagnetic operator of the flavour changing neutral current (FCNC)-type between a $B$- or $D$-meson state and a light hadron and off-shell photon. The computation is carried out by using the method of light-cone sum rules (LCSR). It is found that the matrix element exhibits a large strong phase for which we give a long distance interpretation. The analytic structure of the correlation function in use admits a complex anomalous threshold on the physical sheet, the meaning and handling of which within the sum rule approach is discussed. We compare our results to QCD factorisation for which spectator photon emission is end-point divergent.
Original languageUndefined/Unknown
JournalNuclear Physics B - Proceedings Supplements
Publication statusPublished - 23 May 2013

Keywords

  • hep-ph

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