Joint annual meeting of Swiss and Austrian Physical Societies 2017

【405】 A sensitivity study for the measurement of the photon polarization in B+→K+π−π+γ decays at LHCb

25 Aug 2017, 12:15

15m

Talk Nuclear, Particle- and Astrophysics (TASK - FAKT) Nuclear, Particle-and Astrophysics (TASK-FAKT)

Speaker

Violaine Bellee (Ecole Polytechnique Federale de Lausanne (CH))

Description

Radiative decays of $B$ mesons are flavour-changing neutral current processes used as probes for new physics (NP). They occur predominantly via $b\to s\gamma$ loop diagrams in which the photon is expected, in the Standard Model, to be mostly right handed. However, a significant left-handed component could arise from NP phenomena. The LHCb collaboration is attempting to measure the photon polarisation parameter ${\lambda }_{\gamma }$ via several methods. We present here a promising way to access this quantity through a full five-dimensional amplitude analysis of $B^{+}\to K^{+}{\pi }^{-}{\pi }^{+}\gamma$ decays using data collected with the LHCb detector from 2011 to 2016.

Presentation materials

2017_08_25_CHIPP_CERN.pdf