UK Funding Cut Threatens CERN LHCb Upgrade, Collaboration Warns of Delay

UK Research and Innovation (UKRI) has not committed further contributions to the planned upgrade of the LHCb experiment at CERN, a decision that project leadership says risks a planned investment of about 150 million Swiss francs and could force LHCb to cease operation in 2033. Tim Gershon, the elected project leader and a professor at the University of Warwick, warned the move would prevent the experiment from exploiting the High-Luminosity LHC (HL-LHC) period and the European Strategy for Particle Physics top priority of fully exploiting the HL-LHC.

LHCb, one of the four large experiments at the Large Hadron Collider, focuses on charge–parity measurements in b- and c-hadrons to probe the matter–antimatter asymmetry. The detector began recording first data in 2009 and started its main research programme in 2010. The planned upgrade is designed specifically to allow LHCb to operate through HL-LHC running; Gershon summed the scientific consequence succinctly: "Without LHCb upgrade, it won’t be possible to do that."

The funding pause implicates both UKRI and the Science and Technology Facilities Council (STFC) in project planning. UKRI issued a public statement saying, "International partnerships are crucial for research and innovation, and UKRI remains committed to our existing international obligations – including as the second largest international contributor to CERN." The statement also noted, "Following the spending review that gave UKRI a record four-year settlement to deliver a new mission, UKRI is reforming to align with national priorities. At the same time curiosity driven research will continue to make up around 50% of our funding."

Economic concerns followed the funding news. Howarth highlighted the UK supply-chain impact, noting that "An earlier upgrade to the LHCb experiment generated about £15m in contracts for more than 80 UK companies." Howarth added bluntly, "This funding cut means the upgrade is unlikely to go ahead, so all this business for UK innovators is lost. We urge the government to step back and consider how its new funding strategy will impact UK science." Research leadership has warned the roughly 150 million Swiss franc planned investment could "disappear" if commitments are not reinstated.

Timing is critical for the upgrade schedule. Project leaders say it might be possible to secure short-term funding to cover initial work, but Gershon cautions that without investment from UKRI/STFC "the project will be dead" because international partners cannot proceed on the timescale dictated by the LHC schedule. The collaboration has warned that without a restored commitment LHCb "will now likely finish operation in 2033" and will not take advantage of HL-LHC running.

The decision sits within wider turbulence in UK physics funding, where groups have been asked to plan for cuts averaging 30% and in some cases up to 60%. Ellis says an LHC experiment known as LHCb "will have its budget cut to zero, which jeopardises plans to upgrade the detectors." Reports also suggest other international projects, including the Electron-Ion Collider at Brookhaven, may be affected by the same reshuffle.

With the LHC timetable imposing firm procurement and installation windows, project leaders and UK industrial partners say immediate clarity is needed. If UKRI and STFC do not reverse their non-commitment, the collaboration warns the upgrade risks collapse, UK companies stand to lose contracts totalling millions of pounds, and LHCb will be unable to join HL-LHC operations.