Search for CP violation in B^0 -> J/psi K^0_S decays with first LHCb data

We report a measurement of the CP violation in B^0 -> J/\psi K^0_S decays. We perform a time-dependent analysis of the decays reconstructed in 35/pb of LHCb data that was taken in 2010. We measure the CP asymmetry parameterComment: Presented at the 2011 Hadron Collider Physics symposium (HCP-2011), Paris, France, November 14-18 2011, 3 pages, 3 figure

LHCb: Outer Tracker

The LHCb Outer Tracker Detector Design & Productio

LHCb: Silicon Tracker

Design of the LHCb Silicon Tracker and the Common Tell1 boar

LHCb: Inner Tracker

The LHCb Inner Tracke

LHCb: Beam Pipe

The proton beams circulate in the accelerator in Ultra High Vacuum to make them interact only with each other when colliding at the interaction point. A special beam pipe "holds" the vacuum where they pass through the LHCb detector:it has to be mechanically very strong to stand the difference in pressure between the vacuum inside it and the air in the cavern but also be as transparent as possible for the particles originating in the proton−proton collisions

J/ψJ/\psi and D0D^0 production in sNN\sqrt{s_{\rm NN}} = 68.5 GeV PbNe collisions

The first measurement of $J/\psi$ and $D^0$ production in PbNe collisions by the LHCb experiment in its fixed-target configuration is reported. The production of $J/\psi$ and $D^0$ mesons is studied with a beam of lead ions with an energy of 2.5 TeV per nucleon colliding on gaseous neon targets at rest, corresponding to a nucleon-nucleon centre-of-mass energy of $\sqrt{s_{\rm NN}}$ = 68.5 GeV. The $J/\psi/D^0$ production cross-section ratio is studied as a function of rapidity, transverse momentum and collision centrality. These data are compared with measurements from $p$Ne collisions at the same energy. No anomalous $J/\psi$ suppression that could indicate the formation of a deconfined medium is observed.Comment: All figures and tables, along with any supplementary material and additional information, are available at https://cern.ch/lhcbproject/Publications/p/LHCb-PAPER-2022-011.html (LHCb public pages