LHCb Project Review

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LHCb Project Review. Neville Harnew 3 rd October 2006 Introduction to LHCb and Oxford’s work Summary of work over the last year Physics work and planning Future plans. 2 Ring Imaging Cerenkov - PowerPoint PPT Presentation

Transcript of LHCb Project Review

  • LHCb Project ReviewNeville Harnew3rd October 2006

    Introduction to LHCb and Oxfords work

    Summary of work over the last year

    Physics work and planning

    Future plans

    Oxford Project Review 2006

  • LHCb introductionLHCb 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+-(Hopefully) discover NEW PHysicsLHCb will make measurements from day one Low energy run in 2007First physics run in 2008 Schematic of the LHCb experiment RICH electronics, mechanics and software, along withphysics preparation and Grid are Oxfords LHCb activities

    Oxford Project Review 2006

  • The LHCb Oxford groupFaculty: N. Harnew & G. WilkinsonDept. Lecturer: J. LibbyPostdocs: R. Muresan & P. SpradlinStudents: V. Gligorov, A. Powell, S. Brisbane, Lauren Martin, & Philip Xing Electronic Engineer: P. SullivanElectronic Technicians: N. RotoloDrawing office: R. SenanayakeSystem Engineer: S. Topp-JorgensenGrid programmers: C. Cioffi & A. Soroko

    Oxford Project Review 2006

  • The LHCb RICH1 detectorHPD plane:7 columns,14 tubes eachMagnetic shield boxVertical X-section RICH1 is undergoing phased programme of design and construction

    Oxford Project Review 2006

  • RICH2 - in place in the LHCb pit

    Oxford Project Review 2006

  • Status of Oxford hardware projectsRICH Level-0 electronics

    RICH-1 mechanics

    Oxford Project Review 2006

  • Status of the L0 electronicsOxfords responsibility is the front-end electronics for the RICH detectorsHybrid Photo-Detectors (HPDs) detect the Cherenkov radiation by detecting photoelectrons on a 3232 pixel detector encapsulated within the detector72 mm

    Oxford Project Review 2006

  • The production L0 board

    Oxford Project Review 2006

  • Production status

    300 boards to be produced and tested in Oxford242 boards required to equip both RICHesThe performance is excellentHalf 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 preparationAndrew Powell, Nicolo RotoloSean Brisbane Phil Sullivan Stig Topp Jorgensen Jim LibbyNeville Harnew

    Oxford Project Review 2006

  • HPD column mounting @CERNAndrew Powell, Nicolo RotoloSean Bisbane Phil Sullivan

    Oxford Project Review 2006

  • RICH1 mechanicsCollaboration with Imperial - produced final design of the RICH1 gas enclosureProduced final engineering drawingsPerformed FEA to validate designResponsible for procurement of gas enclosure - leak tested in OxfordDesigned mechanical support and lifting rigHelped with installation with ImperialNext design of the photon detector region

    Rohan Senanayake

    Oxford Project Review 2006

  • Physics work and planningRICH calibration

    g measurement

    Charm physics

    Oxford Project Review 2006

  • RICH calibration

    Using golden kinematics of D*+D0+ decays to select a pure samples of D0 K-+ (and charge conjugate decays) The charge of the tracks from the D0 decays define pure samples of and K from which identification efficiencies can be derived solely from data (GeV/c)Raluca Muresan, Guy Wilkinson

    Oxford Project Review 2006

  • Getting at LHCb will make direct measurements of the unitarity triangle angle

    Classic channel B0sDsK suffers several problems with ambiguous solutions and limited statistics (14o precision in one year)We are exploring alternative channels to measure From B factories:Guy Wilkinson, Jim Libby, Andrew Powell, Neville Harnew

    Oxford Project Review 2006

  • Measuring : B+D0K+ is the weak phase between bcus ( Vcb) and bucs ( Vub)

    Very promising strategies for g being pursued in OxfordDalitz plot fit to 3 body decays D0 Ks and also 4 body decays exploits interferences between sub-resonances in decaycurrent world best measurement from e+e- B factoriesLHCb expects ~2000 events to tape per year (3-body)Atwood-Dunietz-Soni method with D0 K and D0 KSensitivities expected range from 4-14o (parameter dependent)

    Oxford Project Review 2006

  • Charm physics 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 a billion D0 decays a yearAllows sensitivity to D0 mixing and CP violation in charm system

    Patrick Spradlin, Guy Wilkinson

    Oxford Project Review 2006

  • LHC Computing GRID activities

    GANGA (A. Soroko)Grid job controlOperational GUI interface, job merging and splitting,..

    Bookkeeping task (C. Cioffi)Common interface to metadata between experiments

    Oxford Project Review 2006

  • 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 dataMeasuring Charm physics

    Oxford Project Review 2006

  • Looking forward to 2007

    Oxford Project Review 2006

    Words to say with this slide:At a more fundamental level LHCb analyses will exploit the LHC Computing Grid. There are two main areas of software work within the Oxford group to enable LHCb to best exploit the resources available. One area is the GANGA job management system common to Atlas and LHCb. Alex is one of the main developers of this project. It allows simple Python scripting for LCG job management. Ultimately there will be a simple GUI for the analyst to use. A schematic of the architecture is on the top right.

    Beneath this there are many important tasks to allow analysis to be performed transparently on the LCG. One of these is bookkeeping where Carmine is assessing he suitability of the various options for LHCb. These include those ARDA and G-lite. A schematic of the new architecture is on the bottom right.

    Both these topics will continue to be pursued in the next year.