Newly discovered b-hadrons at CMS and ATLAS

by Darren Price (Indiana University), Ernest Aguilo Chivite (Austrian Academy of Sciences (AT))

Thursday 14 Jun 2012, 11:00 → 12:00 Europe/Zurich

4/2-011 - TH common room (CERN)

The observation of an excited b baryon via its strong decay into Xi(b)^- pi^+ (plus charge conjugates) by the CMS experiment is reported. The measurement uses a data sample of pp collisions at sqrt(s) = 7 TeV at the LHC, corresponding to an integrated luminosity of 5.3 inverse femtobarns. The known Xi(b)^- baryon is reconstructed via the decay chain Xi(b)^- to J/psi Xi^- to mu^+ mu^- Lambda^0 pi^-, with Lambda^0 to p pi^-. The chi_b(nP) quarkonium states are produced in proton-proton collisions at the Large Hadron Collider (LHC) at sqrt(s) = 7 TeV and recorded by the ATLAS detector. Using a data sample corresponding to an integrated luminosity of 4.4 fb^-1, these states are reconstructed through their radiative decays to Upsilon(1S,2S) with Upsilon->mu+mu-.

Paper http://arxiv.org/abs/1112.5154 http://arxiv.org/abs/1204.5955

Slides aguilo_x-talk.pdf dprice.pdf