Speaker
Simon Wehle
(DESY Hamburg)
Description
We present the measurement of angular observables in the decay $B^0\to K^{∗0}(892)\ell^+\ell^−$,
where $\ell^+\ell^−$ is either $e^+e^−$ or $\mu^+\mu^−$. The analysis is performed on a data sample corre-
sponding to 711 fb$^{−1}$ containing $772 × 10^6$ $B\bar B$ pairs, collected at the $\Upsilon(4S)$ resonance
with the Belle detector at the asymmetric-energy $e^+e^−$ collider KEKB. Four form-factor
independent angular observables and the longitudinal polarization of the $K^{∗0}(892)$, $F_L$
and the transverse polarization asymmetry $A(2)$ are extracted in five bins of the invariant
mass squared of the lepton system $q^2$.
We compare our results in the region $q^2 < 8$ GeV$^2$/$c^4$ with Standard Model predictions and analyze the $q^2$ region in which the LHCb collaboration reported the so called $P_5′$ anomaly [1, 2].
References
[1] Aaij, R and others Measurement of Form-Factor-Independent Observables in the Decay $B^0\to K^{∗0}\mu^+\mu^−$ 10.1103/PhysRevLett.111.191801
[2] Aaij, Roel and others Angular analysis of the $B^0\to K^{∗0}\mu^+\mu^−$ decay arXiv/1512.04442
Author
Simon Wehle
(DESY Hamburg)
