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.


  • Improved lepton universality measurements show agreement with the Standard Model

    Today at the CERN seminar the LHCb Collaboration presented new tests of lepton universality, one of the basic principles of the Standard Model (SM) of particle physics. This principle states that the SM treats the three charged leptons (electrons, muons and taus) identically, except for differences due to their different masses. The results are in […]

  • LHCb data released to the public

    Today the LHCb collaboration has, for the first time, released its data to the public allowing research to be conducted by anyone in the world. All scientific results from the LHCb collaboration are already made publicly accessible in open-access papers and numerical results from graphs in HEPData. Starting from today, not only are the results […]

  • First VELO closing

    Today the two halves of new Vertex Locator (VELO) approached the LHC proton-proton collision point for the first time. This process is called “VELO closing” in the LHCb jargon. The images below were taken during installation of the VELO detector inside LHCb cavern and its connection to the LHC vacuum system. The mounting of the […]

  • New test of lepton universality using the first simultaneous measurement of R(D) and R(D*) observables at LHCb

    [ R(D*) = 0.281±0.018±0.024 ][ R(D) = 0.441±0.060±0.066 ] Today at the CERN seminar the LHCb Collaboration presented new tests of lepton universality, one of the basic principles of the Standard Model (SM) of particle physics. This principle states that the SM treats the three charged leptons (electrons, muons and taus) identically, except for kinematical […]

  • The first evidence for CP violation in a specific charm hadron decay

    The International Conference on High Energy Physics, ICHEP 2022, ended today in Bologna (Italy). At this conference, the LHCb collaboration reported a new measurement of the CP-violating asymmetry, ACP, in the decay of neutral charmed mesons, the D0, into a pair of charged kaons, D0→K–K+. This result followed the exciting result of March 2019, in […]

  • First collisions at the world-record energy for a brand-new LHCb detector

    Start of LHC Run 3. Today, at 16:47, protons collided again at LHCb after a 3.5 year break known as Long Shutdown 2 (LS2). During this period the original LHCb experiment has been largely dismantled and an almost completely new detector has been constructed. At the same time improvements of the LHC collider allowed it […]