Speaker
Alessandro Pilloni
(Sapienza U.)
Description
In b -> s gamma transitions, the standard model predicts that B0 (antiB0) decays
are related predominantly to the presence of right (left) handed photons in the final state.
Therefore, the mixing-induced CP asymmetry in B -> fCP decays, where
fCP is a CP eigenstate, is expected to be small. This prediction may be altered
by new-physics (NP) processes in which opposite helicity photons are
involved. Independently, decays to K pi pi gamma can display an interesting
hadronic structure: they have contributions from several kaonic resonances
decaying to Kpipi. The decays of these resonances themselves exhibits a resonant
structure, with contributions from K*pi, Krho and a (Kpi) S-wave. In the
present analysis, we extract information about the Kpipi resonant structure by
means of an amplitude analysis of the Kpipi and Kpi invariant mass distributions
in B+ -> K+pi-pi+ gamma decays. The results are used, assuming isospin symmetry,
to extract the mixing-induced CP parameters of the process B0 -> K0S rho0 gamma
from the time-independent analysis of B0 -> K0S pi+ pi- gamma.
Authors
Alessandro Pilloni
(Sapienza U.)
Fabio Anulli
(Universita e INFN, Roma I (IT))
