# IOP 2014 Joint HEPP & APP Group Meeting

Apr 7 – 9, 2014
Royal Holloway, University of London
Europe/London timezone
Institute of Physics 2014 Joint High Energy Particle Physics and Astro Particle Physics Groups Annual Meeting

## Measurement of the differential branching fraction of the rare decay $\Lambda_{b} \to pK\mu\mu$ at LHCb

Apr 8, 2014, 1:15 PM
15m
Room B (Windsor Building)

### Room B

#### Windsor Building

contributed talk Flavour Physics and Beyond

### Speaker

Mr Michael Kiss (STFC (RAL))

### Description

Using the data from the LHCb experiment at CERN , the flavour structure of physics beyond standard model (SM) is probed using one of the rare B-decay channels, namely the $\Lambda_{b} \to pK\mu\mu$ decay. This decay occurs through a flavour changing neutral current process mediated by electroweak penguin and box diagrams in the SM. It is forbidden at the tree level and suppressed at the one-loop level by the GIM (Glashow–Iliopoulos–Maiani) mechanism. The first goal of the analysis is to use a dataset corresponding to 3fb-1 integrated luminosity collected by LHCb during 2011-12 to measure the differential branching fraction of this channel as function of the dimuon invariant mass squared. A multivariate event selection method was developed for this channel and the control channel $\Lambda_{b} \to pK J/\psi$. The general strategy of the analysis will be described. The features of the selection procedure and the steps involved in extracting the branching fraction will be presented. The systematic errors for this measurement also will be discussed.

### Primary author

Mr Michael Kiss (STFC (RAL))

 Slides