# The 2009 Europhysics Conference on High Energy Physics

Jul 16 – 22, 2009
Kraków, Poland
Europe/Warsaw timezone

## New physics sensitivity of the rare decay mode $B \to K^0 \ell^-\ ell^+$

Jul 17, 2009, 9:30 AM
15m
Large (Kraków, Poland)

### Large

#### Kraków, Poland

The Auditorium Maximum of the Jagiellonian University 33 Krupnicza Street 31-123 Kraków
Flavour Physics

### Speaker

Dr Tobias Hurth (CERN)

### Description

We design new observables available from the angular distributions of the decay $B \to K^0 ell^- ell^+$ with high sensitivity to specific new phsyics operators. We present a NLO analysis of all observables based on the QCD factorization approach in the low-dilepton mass region and make the uncertaintities due to the $\Lambda/m_b$ corrections manifest and finally analyse the sensitivity of the new observables to new physics. We explore the experimental sensitivities at LHCb and SuperLHCb based on a full-angular fit method. We also show that the previously discussed transversity amplitude $AT_1$ cannot be measured at the LHCb experiment or at future $B$ factory experiments as it requires a measurement of the spin of the final state particles. We also analyse CP violating observables in this decay mode and critically discuss their sensitivity to new physics.

### Primary author

Dr Tobias Hurth (CERN)

### Co-authors

Dr Joaquim Matias (Universitat Autonoma de Barcelona) Mr Marc Ramon (Universitat Autonoma de Barcelona) Dr Ulrik Egede (Imperial College, LHCb) Mr Will Reece (Imperial College, LHCb)

 Slides