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| LHCb RICH | |
|---|---|
| Name | LHCb RICH |
| Location | CERN, Geneva |
| Established | 2008 |
| Type | Particle detector component |
| Owner | CERN |
LHCb RICH The LHCb RICH is a specialized ring-imaging Cherenkov detector subsystem designed for the LHCb experiment at CERN, providing charged-particle identification critical for studies in flavor physics, CP violation, and rare decays. It operates within the LHCb spectrometer alongside the Vertex Locator, Tracker Turicensis, and Calorimeter systems to distinguish pions, kaons, and protons across a wide momentum range, supporting analyses from B meson decays to exotic hadron searches.
The RICH contributes to LHCb measurements that connect to research by collaborations and institutions such as ATLAS, CMS, ALICE, CERN, Fermilab, and DESY, and complements theoretical frameworks from groups at University of Oxford, University of Cambridge, Imperial College London, Massachusetts Institute of Technology, and Princeton University. It plays a role in precision results compared with inputs from experiments like BaBar, Belle, Belle II, and surveys of heavy-flavor physics from Tevatron, SLAC National Accelerator Laboratory, KEK, and Brookhaven National Laboratory.
The RICH design integrates radiator volumes, mirror systems, photon detectors, and readout electronics arranged to work with the LHCb dipole magnet, the LHC beamline, and subdetectors such as the Vertex Locator, Tracker Turicensis, Inner Tracker, Outer Tracker, and Muon system. Mechanical engineering and project management involved groups from CERN Engineering Department, STFC Rutherford Appleton Laboratory, University of Manchester, INFN, University of Barcelona, Nikhef, University of Glasgow, University of Edinburgh, EPFL, and University of Cambridge. Optical support structures reference techniques from optics groups at Max Planck Institute for Physics, University of Oxford, and University College London.
Cherenkov light production links to foundational studies by researchers at Frankly and Tamm-era institutions and later implementations influenced by apparatus in SLAC, DESY, and KEK. The RICH uses gaseous radiators such as C4F10 and aerogel layers to cover momentum ranges important for analyses by teams at CERN Theory Department, LAPP, University of Zurich, University of Geneva, and LAL Orsay. The mirror assemblies employ fabrication techniques developed with industry partners and expertise from Optical Society of America-affiliated groups and laboratories including Fraunhofer Society and Rutherford Appleton Laboratory facilities.
Photon detection leverages hybrid photon detectors and multi-anode photomultiplier technologies refined in collaboration with manufacturers and detector groups at Hamamatsu Photonics, Photonis, STMicroelectronics, CERN Electronics Group, University of Heidelberg, University of Liverpool, and University of Milan. Readout electronics designs draw on experience from ATLAS Tile Calorimeter, CMS HCAL, ALICE TRD, and digital readout projects at CERN Microelectronics Group and University of Bologna. Data acquisition interfaces integrate with the LHCb DAQ, LHCb trigger, LHCb computing, and grid resources such as Worldwide LHC Computing Grid, CERN OpenStack, European Grid Infrastructure, GridPP, and regional centers at CNAF.
Calibration campaigns and alignment strategies are coordinated with survey groups from CERN Surveying Group, National Physical Laboratory, PTB, and university metrology labs. Performance validation uses control channels studied by collaborations at University of Warwick, University of Liverpool, University of Bristol, University of Oxford, University of Cambridge, Imperial College London, and external comparisons with results from BaBar, Belle II, and CLEO. Software tools for reconstruction and likelihood-based particle identification are developed within frameworks used at CERN IT, Gaudi, ROOT, GEANT4, and analysis teams in the LHCb Collaboration.
Particle identification outputs feed physics analyses addressing topics investigated by researchers at CERN, INFN, Oxford, Cambridge, Princeton, MIT, Harvard University, Yale University, Columbia University, University of Chicago, Stanford University, SLAC, DESY, KEK, Brookhaven National Laboratory, FNAL, and European institutions participating in flavor physics. PID likelihoods and performance figures are used in measurements of CP violation in channels related to Cabibbo–Kobayashi–Maskawa matrix elements and rare processes compared with theoretical predictions from groups at CERN Theory, Perimeter Institute, Institut des Hautes Études Scientifiques, and universities producing phenomenology studies.
Commissioning began in the period of LHC startup involving collaborations across CERN, national laboratories, and universities; milestone reviews engaged committees similar to those at CERN Research Board and funding agencies such as European Research Council, STFC, INFN, NSF, and DOE. Upgrade campaigns for Run 2 and the LHCb Upgrade I and Upgrade II programs involved new photon detectors and electronics that coordinate with projects at CERN HL-LHC, LHCb Upgrade, RD53, CERN Detector R&D, EU Horizon 2020, and industrial partners. The RICH continues to support precision measurements contributing to global efforts by collaborations including ATLAS, CMS, ALICE, and future facilities such as Future Circular Collider studies and proposals from institutes like IHEP, JINR, and KEK.