Observation of orbitally excitedBmesons inpp¯collisions ats=1.8 TeV

Observation of orbitally excited B mesons in pp̅ collisions at √s =1.8 TeV

Observation of orbitally excited B(s) mesons.

We report the observation of two narrow resonances consistent with states of orbitally excited (L=1) B_(s) mesons using 1 fb;(-1) of pp[over ] collisions at sqrt[s]=1.96 TeV collected with the Collider Detector at Fermilab II detector at the Fermilab Tevatron. We use two-body decays into K- and B+ mesons reconstructed as B(+)-->J/psiK(+), J/psi-->mu(+)mu(-) or B(+)-->D[over ](0)pi(+), D[over ](...

Observation of exclusive γγ production in pp¯ collisions at √s=1.96 TeV.

We have observed exclusive γγ production in proton-antiproton collisions at √s=1.96 TeV, using data from 1.11±0.07 fb(-1) integrated luminosity taken by the Run II Collider Detector at Fermilab. We selected events with two electromagnetic showers, each with transverse energy E(T)>2.5 GeV and pseudorapidity |η|<1.0, with no other particles detected in -7.4<η<+7.4. The two showers have similar E(...

Observation of J/ψ-pair production in pp collisions at √s=7 TeV

Article history: Received 6 September 2011 Received in revised form 6 December 2011 Accepted 6 December 2011 Available online 9 December 2011 Editor: M. Doser The production of J/ψ pairs in proton–proton collisions at a centre-of-mass energy of 7 TeV has been observed using an integrated luminosity of 37.5 pb−1 collected with the LHCb detector. The production cross-section for pairs with both J...

Observation of J/ψ-pair production in pp collisions at √s=7 TeV

Article history: Received 6 September 2011 Received in revised form 6 December 2011 Accepted 6 December 2011 Available online 9 December 2011 Editor: M. Doser The production of J/ψ pairs in proton–proton collisions at a centre-of-mass energy of 7 TeV has been observed using an integrated luminosity of 37.5 pb−1 collected with the LHCb detector. The production cross-section for pairs with both J...