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.

  • Special LHC Low Energy Run – LHCb goes to space

    LHCb is celebrating the end of a very strong proton-proton run in 2026, during which the experiment benefitted from the stable and efficient running of the detector and the excellent LHC performance to collect 5.34 fb-1 of collision data. Almost all the data were taken at the highest LHC energy of 13.6 TeV. However, on…

  • Lepton Flavor Universality Tests Using Bc+ Decays at LHCb

    Today, at the CERN seminar, the LHCb Collaboration presented a new test of lepton flavour universality (LFU), one of the basic principles of the Standard Model (SM) of particle physics. This principle states that the SM treats the three charged leptons (e, μ and τ) identically, except for kinematical effects due to their different masses.…

  • A measurement of the CKM angle γ

    LHCb has just submitted for publication a paper reporting a measurement of the CKM angle γ using the decay channels B±→DK± and B±→Dπ±, where the D meson decays to D→KS0 π+π− or D→KS0K+K−. This is the first measurement of the CKM angle γ using data collected in 2024 with the upgraded LHCb detector. LHCb is…

  • New data-taking records for LHCb

    Since March 30, the LHC accelerator has been operating in a special configuration, providing a lower collision rate to ATLAS and CMS than usual. This allows these experiments to complement their physics programmes, targeting a range of additional precision measurements. In this configuration, the so-called “burn-off” of the beams is much slower than usual, resulting…

  • Observation of the doubly charmed heavy proton Ξcc+.

    Today at the Rencontres de Moriond Electroweak meeting, the upgraded LHCb experiment at CERN announced its first particle discovery: a new kind of heavy proton-like particle known as the Ξcc⁺. To appreciate what makes this particle special, it helps to recall how an ordinary proton is built. A proton contains three quarks – two up…

  • LHCb releases service to access Run II data

    The LHCb collaboration is happy to announce the official release of the LHCb Ntupling Service: a web service for on-demand production and publishing of custom LHCb open data. This provides the public access to both Run I, and for the first time, Run II pp data collected by LHCb. This amounts to over 4 PB…