# Europhysics Conference on High-Energy Physics 2011

Jul 20 – 27, 2011
Alpes Congrès - Alpexpo
Europe/Paris timezone

## Observation of the X(3872) state at CMS

Jul 22, 2011, 3:30 PM
15m
les Ecrins 3 (Alpes Congrès - Alpexpo)

### les Ecrins 3

#### Alpes Congrès - Alpexpo

Parallel session talk Flavour Physics and Fundamental Symmetries

### Speaker

Dr Daniele Fasanella (INFN and University of Bologna)

### Description

A measurement of the ratio of X(3872) and \psi(2S) signal yields in pp collisions at 7 TeV is presented, using data recorded with the CMS experiment in 2010. The corresponding integrated luminosity is 36/pb. X and Psi(2S) decays are reconstructed in the final state $J/\psi \pi^+ \pi^-$, with the subsequent decay of the $J/\psi$ into two muons. The measured ratio is compared to theoretical expectations. In this talk we present preliminary measurements of the Bc mass and lifetime in the J/Psi+pion decay performed with the CMS experiment. The lifetime is measured for the first time using a fully kinematically reconstructed channel; Unlike previous measurements from the Tevatron, the fully reconstructed channel does not require corrections for undetected neutrinos from Monte Carlo simulation.

### Primary author

Dr manfred krammer (HEPHY, Vienna)

 Slides