LHCb experiment

LHCb is an experiment set up to explore what happened after the Big Bang that allowed matter to survive and build the Universe we inhabit today

Fourteen billion years ago, the Universe began with a bang. Crammed within an infinitely small space, energy coalesced to form equal quantities of matter and antimatter. But as the Universe cooled and expanded, its composition changed. Just one second after the Big Bang, antimatter had all but disappeared, leaving matter to form everything that we see around us — from the stars and galaxies, to the Earth and all life that it supports.


  • ECAL and RICH sub-detector enhancements approved for construction

    The LHCb experiment will upgrade the inner part of the Electromagnetic Calorimeter and the electronics of the Ring Imaging Cherenkov detectors in the next LHC Long Shutdown (LS3). On July 5, 2022, protons collided again at LHCb after a 3.5 year break known as Long Shutdown 2 (LS2) marking the start of the LHC Run…

  • LHCb observes the rare decay J/ψ→μ+μμ+μ

    Today, at the Rencontres de Moriond QCD and High Energy Interactions, the LHCb collaboration reported the observation of the rare elecromagnetic decay J/ψ→μ+μ–μ+μ–. The simultaneous discovery of the J/ψ meson at Brookhaven and SLAC in November 1974 brought about a revolutionary change in the particle physics landscape. Prior to this revolution, in analogy to atomic…

  • Measurement of D0 − antiD0 mixing and CP violation in D0→K+π decays

    Today, at a CERN seminar, the LHCb collaboration reported results of the measurement of D0 − D0 mixing and CP violation in D0→K+π– decays with the full Run 2 data sample. When combined with the previous results from Run 1, the measurement provides 40% improvement to the total uncertainty compared to the previously published analysis.…

  • Ruhr-Universität Bochum became LHCb’s 100th collaborating Institute

    In February 2024, the Ruhr-Universität Bochum became 100th institute to join the LHCb collaboration. We have come a long way since August 1995, when a Letter of Intent was submitted for LHCb, the world’s first dedicated b-physics experiment at a hadron collider. The beauty quark b and anti-quark b bound-state Υ was discovered at Fermilab…

  • Observation of the Bc+→J/ψπ+π0 decay

    The LHCb collaboration today submitted for publication a paper reporting the first observation of the Bc+→J/ψπ+π0 decay with overwhelming significance. The π+π0 mass spectrum is consistent with the dominance of an intermediate ρ+ contribution. The Bc+ meson is composed of two heavy quarks, b and c. It is the heaviest meson that can only decay…

  • LHCb releases the entire Run I dataset

    Today the LHCb collaboration complete the release of data collected throughout the Run I of the Large Hadron Collider at CERN. The sample made available amounts to approximately 800 terabytes (TB) of data. These data, collected by the LHCb experiment in 2011 and 2012, contain information obtained from proton-proton collisions[1] . The format made available provides…