FCNC transition $c\to uγ$ in $B_c\to B_u^*γ$ decay

Details FCNC transition $c\to uγ$ in $B_c\to B_u^*γ$ decay FCNC transition $c\to uγ$ in $B_c\to B_u^*γ$ decay

1999-11-17

arxiv.org/abs/hep-ph/9911389v1

IJS-TP/99-29

Physics

High Energy Physics

High Energy Physics - Phenomenology

6 pages; presented at Heavy Flavours 8, Southampton, UK, 1999

Scientific paper

We propose the $B_c\to B_u^*\gamma$ decay as the most suitable probe for the flavour changing neutral transition $c\to u\gamma$. We estimate the short and long distance contributions to this decay within the standard model and we find them to be comparable; this is in contrast to radiative decays of $D$ mesons, that are completely dominated by the long distance contributions. Since the $c\to u\gamma$ transition is very sensitive to the physics beyond the standard model, the standard model prediction $Br(B_c\to B_u^*\gamma)\sim 10^{-8}$ obtained here opens a new window for future experiments. The detection of $B_c\to B_u^*\gamma$ decay at branching ratio well above $10^{-8}$ would signal new physics.

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