LHCb Project Review

1. LHCb Project Review Neville Harnew 3rd October 2006 Introduction to LHCb and Oxford’s work Summary of work over the last year Physics work and planning Future plans

2. 2 Ring Imaging Cerenkov detectors (RICHes) provide particle ID over a wide range of momenta-key for hadronic B decays important for CP studies LHCb introduction Schematic of the LHCb experiment • LHCb will: • Make precision measurements of CP violation in the decay of all flavours of B mesons • Search for New Physics in rare B decays e.g. B→μ+μ- • (Hopefully) discover NEW PHysics • LHCb will make measurements from day one • Low energy run in 2007 • First physics run in 2008 RICH electronics, mechanics and software, along with physics preparation and Grid are Oxford’s LHCb activities Oxford Project Review 2006

3. The LHCb Oxford group Faculty: N. Harnew & G. Wilkinson Dept. Lecturer: J. Libby Postdocs: R. Muresan & P. Spradlin Students: V. Gligorov, A. Powell, S. Brisbane, Lauren Martin, & Philip Xing Electronic Engineer: P. Sullivan Electronic Technicians: N. Rotolo Drawing office: R. Senanayake System Engineer: S. Topp-Jorgensen Grid programmers: C. Cioffi & A. Soroko Oxford Project Review 2006

4. The LHCb RICH1 detector Magnetic shield box VerticalX-section HPD plane: 7 columns, 14 tubes each RICH1 is undergoing phased programme of design and construction Oxford Project Review 2006

5. RICH2 - in place in the LHCb pit Oxford Project Review 2006

6. Status of Oxford hardware projects • RICH Level-0 electronics • RICH-1 mechanics Oxford Project Review 2006

7. Schematic of a HPD section silicon detector readout pixel chip 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 72 mm Oxford Project Review 2006

8. PIXEL anodes 16.5 cm Kaptons 10 cm The production L0 board Oxford Project Review 2006

9. Production status Andrew Powell, Nicolo Rotolo Sean Brisbane Phil Sullivan Stig Topp Jorgensen Jim Libby Neville Harnew • 300 boards to be produced and tested in Oxford • 242 boards required to equip both RICHes • The performance is excellent • Half of boards have been produced and 1/3rd shipped to CERN for mounting in the RICHes [on time and within budget] • ECS and DCS in preparation Oxford Project Review 2006

10. HPD column mounting @CERN Andrew Powell, Nicolo Rotolo Sean Bisbane Phil Sullivan Oxford Project Review 2006

11. Rohan Senanayake RICH1 mechanics • Collaboration with Imperial - produced final design of the RICH1 gas enclosure • Produced final engineering drawings • Performed FEA to validate design • Responsible for procurement of gas enclosure - leak tested in Oxford • Designed mechanical support and lifting rig • Helped with installation with Imperial • Next – design of the photon detector region Oxford Project Review 2006

12. Physics work and planning • RICH calibration • g measurement • Charm physics Oxford Project Review 2006

13. RICH calibration Raluca Muresan, Guy Wilkinson • Using golden kinematics of D*+→D0π+ decays to select a pure samples of D0 →K-π+ (and charge conjugate decays) • The charge of the tracks from the D0 decays define pure samples of π and K from which identification efficiencies can be derived solely from data Oxford Project Review 2006 (GeV/c)

14. Guy Wilkinson, Jim Libby, Andrew Powell, Neville Harnew Getting at γ • LHCb will make direct measurements of the unitarity triangle angle γ • Classic channel B0s→DsKsuffers several problems with ambiguous solutions and limited statistics (14o precision in one year) • We are exploring alternative channels to measure γ • From B factories: Oxford Project Review 2006

15. D0 and D0 decay to a common final state Measuring γ: B+→D0K+ • γis the weak phase betweenb→cus (Vcb) andb→ucs (Vub) • Very promising strategies for g being pursued in Oxford • Dalitz plot fit to 3 body decays D0 →Ksππand also 4 body decays • exploits interferences between sub-resonances in decay • current world best measurement from e+e-B factories • LHCb expects ~2000 events to tape per year (3-body) • Atwood-Dunietz-Soni method withD0→KπandD0 →Kπππ • Sensitivities expected range from 4-14o (parameter dependent) Oxford Project Review 2006

16. Charm physics Patrick Spradlin, Guy Wilkinson • Oxford are studying charm physics at LHCb (Oxford are the leading group in LHCb working on charm physics) • Inclusive D* higher level trigger stream will provide ½ a billion D0 decays a year • Allows sensitivity to D0 mixing and CP violation in charm system Oxford Project Review 2006

17. SCRIPTS GUI CLIP TCP/IP Streaming GANGA application GPI Bookkeeping ARDA Server (AMGA) Job Repository ARDA Client API Ganga.Core Athena Gaudi Tomcat Servlet Monitoring Web Browser File Workspace IN/OUT SANDBOX localhost LSF gLite LCG2 Plugin Modules DIRAC DIAL LHC Computing GRID activities • GANGA (A. Soroko) • Grid job control • Operational GUI interface, job merging and splitting,….. • Bookkeeping task (C. Cioffi) • Common interface to metadata between experiments Oxford Project Review 2006

18. Future plans • L0 electronics production completed (end of 2006) • RICH1 HPD design finished (end of 2006) • RICH commissioning of hardware and software (until end 2007) • Preparing physics tools to maximize the potential of the data from day one: • Controlling systematic effects with data • Measuring γ • Charm physics Oxford Project Review 2006

19. Looking forward to 2007 Oxford Project Review 2006