Hot topics at LHCb and search for the rare decay Bs->mumu

par Dr Gaia Lanfranchi (LNF-INFN Frascati)

vendredi 18 mars 2011, 14:00 → 15:00 Europe/Paris

Auditorium M. Vivargent (LAPP)

The LHCb experiment at CERN's Large Hadron Collider is looking for signatures of New Physics through precision measurements of processes involving B mesons and other hadrons containing b or c quarks. In particular, due to its sensitivity to New Physics contributions, the Branching Ratio BR ($B_s \to \mu^+ \mu^-$) is one of the most interesting measurements that LHCb can perform with first data. The Standard Model (SM) prediction is $BR(B_s \to \mu^+\mu^-) = (3.35 \pm 0.32) \times 10^{-9}$ while the current upper limit given by Tevatron is $BR < 36 \times 10^{-9}$ @ 90\% CL, which is still one order of magnitude higher than SM prediction. Monte Carlo simulations show that LHCb can compete with the Tevatron experiments with approximately 0.1 fb$^{-1}$ of data collected at LHC with $pp$ collisions at a center-of-mass energy of 7 TeV. I will present the first result obtained by LHCb based on 40 pb-1 of data collected between July and October 2010. LHCb physics program is very broad and covers many topics in B and charm sectors, as the mixing induced CP violating phase in Bs system, the mixing and CPV in charm system and the gamma angle. I will present the results and prospects for measurements that can be competitive with the data collected in the forthcoming 2011 run.

Slides LAPP_lanfranchi_18march2011.pdf