Speaker
Dr
Leonardo Vernazza
(Johannes Gutenberg Universität Mainz)
Description
The large discrepancy between theory and experiment observed in $A_{\rm CP}(B^-\to\pi^0 K^-)-A_{\rm CP}(\bar{B}^0\to\pi^+ K^-)$ can be solved with the introduction of a new electroweak penguin amplitude. Motivated by this result, we analyze the $\bar B_s\to\phi\rho^0$ and $\bar B_s\to\phi\pi^0$ decays which are dominated by the electroweak penguins, and show that in presence of a new electroweak penguin amplitude their branching ratio can be enhanced by up to an order of magnitude, without violating any constraints from other non-leptonic decays. This makes them interesting modes to be investigated at LHCb and future $B$ factories. We perform both a model independent analysis and a study within realistic NP models such as a modified $Z^0$ penguin scenario, a model with an additional $U(1)$ and supersymmetry. In these cases the new amplitude can be correlated with other flavour phenomena such as the semileptonic $B$ decays and $B_s$-$\bar{B}_s$ mixing, which yields more stringent constraints on the enhancement of the two $B_s$ decays.
Primary authors
Mr
Dominik Scherer
(KIT, Karlsruhe)
Dr
Hofer Lars
(KIT, Karlsruhe)
Dr
Leonardo Vernazza
(Johannes Gutenberg Universität Mainz)
