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Polarization States in B -> rho K* and New Physics

Seungwon Baek·Alakabha Datta·Philippe Hamel·Oscar F. Hernandez·David London
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Abstract

The standard-model explanations of the anomalously-large transverse polarization fraction fT in B -> phi K* can be tested by measuring the polarizations of the two decays B+ -> rho+ K*0 and B+ -> rho0 K*+. For the scenario in which the transverse polarizations of both B -> rho K* decays are predicted to be large, we derive a simple relation between the fT's of these decays. If this relation is not confirmed experimentally, this would yield an unambiguous signal for new physics. The new-physics operators which can account for the discrepancy in B -> pi K decays will also contribute to the polarization states of B -> rho K*. We compute these contributions and show that there are only two operators which can simultaneously account for the present B -> pi K and B -> rho K* data. If the new physics obeys an approximate U-spin symmetry, the B -> phi K* measurements can also be explained.

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Seungwon Baek, Alakabha Datta, Philippe Hamel, Oscar F. Hernandez, David London. 2005-10-27. Polarization States in B -> rho K* and New Physics. https://doi.org/10.1103/physrevd.72.094008

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