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Oxford LHCb

Oxford LHCb. Why flavour physics matters Status of LHCb and Oxford group RICH activities Physics activities Summary and Outlook. Jim Libby, PP Open Day, 5/10/07. Flavour physics. Flavour physics has been an essential to the construction of Standard Model:. GIM mechanism → charm

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Oxford LHCb

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  1. Oxford LHCb Why flavour physics matters Status of LHCb and Oxford group RICH activities Physics activities Summary and Outlook Jim Libby, PP Open Day, 5/10/07

  2. Flavour physics Flavour physics has been an essential to the construction of Standard Model: • GIM mechanism → charm • CP Violation → 3 generations • B mixing → heavy top All surprises that predated ‘direct’ discovery! We may assume same story will continue! Precise measurements nature of new physics at TeV scale and beyond. In B physics goal is to look for new sources of CP violation, or deviations from SM in very rare CP conserving processes, eg. BR(Bs→μμ) PP Open Day 2007

  3. LHCb in a slide Muon Detector Tracking stations interaction region • Forward geometry: • 1012 bb/2 fb-1 • both B hadrons in acceptance for tagging • excellent proper time resolution • RICHs for hadron ID • Hardware and software trigger for B-physics • Ready for LHC t0 proton beam Trigger Tracking Interaction point PP Open Day 2007

  4. LHCb Oxford 13 physicists and engineers 6 students • Faculty: N. Harnew (RICH coordinator) & G. Wilkinson (CP working group convenor) • Dept. Lecturer: J. Libby • Royal Soc Fellow: Malcolm John • Postdocs: R. Muresan & P. Spradlin • Students: A. Powell, S. Brisbane, L. Martin, F. Xing, Philip Hunt and Chris Thomas (joint with RAL) • Electronics, Systems and Software Engineers: I. McArthur, P. Sullivan, S. Topp-Jorgensen • RICH 1 Mechanics : T. Handford, B. Ottewell, R. Senanayake • Grid programmers: A. Soroko PP Open Day 2007

  5. Status of the L0 electronics Oxford’s responsibility is the front-end electronics for the RICH detectors Hybrid Photo-Detectors (HPDs) detect the Cherenkov radiation by detecting photoelectrons on a 32×32pixel detector encapsulated within the detector Schematic of a HPD section silicon detector readout pixel chip 72 mm PP Open Day 2007

  6. Level-0 Production & DAQ status 300 boards have been produced and tested in Oxford 242 boards required to equip both RICHes Project finished successfully Commissioning is in progress – all RICH2 photon detectors have been successfully read out Final Level-0 experimental control system (ECS) is very well advanced at CERN Sean Brisbane Neville Harnew Jim Libby Phil Sullivan Stig Topp Jorgensen PIXEL anodes Kaptons Level-0 board PP Open Day 2007

  7. HPD column mounting at CERN RICH 2 Sean Brisbane Andrew Powell Phil Sullivan L0 boards RICH 1 All RICH-1 and RICH-2 ladders are now fully equipped with HPDs and Level-0 boards HPDs PP Open Day 2007

  8. 6 L0 Readout in Action Testbeam evaluation of 48 HPDs in 60 GeV/c beam with C4F10 radiator. (Beam single particles with composition 80% p, 10% e, 7% K, 3% p) PP Open Day 2007

  9. RICH1 mechanics Oxford has extensive involvement in RICH1 mechanics project, vital to the collaboration for delivering on time-critical items. Work in collaboration with ICSTM. Matthew Brock, Charlie Evans Wing Lau, Brian Ottewell Tony Handford, Rohan Senanayake, Mike Tacon and the workshop team • Oxford produced final design and supervised construction of the RICH1 gas enclosure. This is now installed. • Designed mechanical support and lifting rig for gas enclosure. • Designed and constructed mirror installation & storage boxes • Designed and supervised fabrication of upper and lower HPD mounting and rail system. PP Open Day 2007

  10. Oxford and LHCb Physics Im a   Re 1 Oxford has had leading involvement in physics studies of LHCb flag-ship measurements since start of collaboration, and this continues. Developed new strategies to extend ‘physics-reach’ of experiment. At present, tightly-focused and intensive programme in two key areas: 1) Precise measurement of the unitarity triangle γ (LHCb’s raison d’etre ?) [Libby, Harnew, Wilkinson, Powell, Brisbane, Martin] 2) Studies of charm mixing and search for CP violation in the D system. [Wilkinson, Spradlin, Xing, Muresan] PP Open Day 2007

  11. 2 → f + → f Oxford LHCb and the UT Angle γ γ is essentially the CP violating phase in b→u transitions. It is very badly known (σ ~ 300). A precise measurement of γ is the next big challenge in flavour physics. Oxford LHCb is leading this work. Best way (statistically precise and theoretically clean) to measure γ is through ‘B→DK’ decays. γ Compare rates or kinematical distributions between B+ and B- for cases where f is a final state common to D and Dbar. KK ππ Ksππ Kπππ KKππ Kππ0 We estimate combined precision of 1-2o possible at LHCb ! Interference term picks out γ PP Open Day 2007

  12. Summary and Outlook • Oxford efforts have been central to getting LHCb RICH • system built and ready for data-taking • LHCb physics programme is of highest scientific importance. All measurements will begin in earnest as soon as machine and detector is commissioned. • Oxford in pole position to lead several of most important analyses, in particular γ measurement and charm studies. PP Open Day 2007

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