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4-11 July 2012
Melbourne Convention and Exhibition Centre
Australia/Melbourne timezone
ICHEP2012 - 36th International Conference for High Energy Physics

A proposal to solve some puzzles in semileptonic B decays

5 Jul 2012, 09:00
Room 220 (Melbourne Convention and Exhibition Centre)

Room 220

Melbourne Convention and Exhibition Centre

Melbourne Australia
Parallel Sessions Track 7. CP Violation, CKM, Rare Decays, Meson Spectroscopy TR5 & TR7 - Room 220 - B Physics and CP Violation, etc.


Mr Florian Bernlochner (University of Victoria (CA))


Some long-standing problems in the experimental data for semileptonic b -> c l nu decay rates have resisted attempts to resolve them, despite substantial efforts. We show that the presence of a relatively large decay rate into radially-excited D-mesons may alleviate several of these tensions simultaneously. In particular, their presence could help explaining the discrepancy between model calculations and experimental results for the first orbitally-excited doublets, known as the “1/2 vs. 3/2 puzzle”. In order to substantiate our hypothesis, we estimate the decay rate into the first two radially excited charmed states using a quark-model and light-cone sum-rules, finding that it is not unreasonable to expect O(1%) branching fraction for these decays.

Primary authors

Mr Florian Bernlochner (University of Victoria (CA)) Dr Sascha Turczyk (LBNL) Zoltan Ligeti (Lawrence Berkeley National Laboratory)

Presentation materials