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Summary of 8 th CDF B Mixing Workshop

Summary of 8 th CDF B Mixing Workshop. Held morning of Thu 6/16/05 and Fri 6/17/05 Topics of discussion status of updating hadronic analysis adding semileptonics from TTT applications of NeuroBayes to B mixing analyses studies of lifetime resolution progress on same side kaon tagging

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Summary of 8 th CDF B Mixing Workshop

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  1. Summary of 8th CDF B Mixing Workshop • Held morning of Thu 6/16/05 and Fri 6/17/05 • Topics of discussion • status of updating hadronic analysis • adding semileptonics from TTT • applications of NeuroBayes to B mixing analyses • studies of lifetime resolution • progress on same side kaon tagging • current projections • other topics: semileptonic lifetimes, B**, fragmentation studies • Productive discussion – follow up in subgroup meetings • B lifetimes and mixing • BPAK Kroll/Bedeschi

  2. = on week (Old) Calendar for Near Term Summer 2005 CDF Week, Sitges Lepton Photon, Uppsala HEPP-EPS, Lisbon Kroll/Bedeschi

  3. Proposed Plan • Too late for update for LP05 and HEPP-EPS • Instead focus on following milestones • End Summer 2005 • complete update of Hadronic analysis with 2004 data (360 pb-1) • add semileptonics from TTT • publish these results with aim to get in 2006 PDG • Early Fall 2005 • add SS(K)T to analysis • 1st to hadronics (no issue of partial reconstruction, less signal cross-talk) • then to semileptonics • Winter 2006 • add as much 2005 data as possible Kroll/Bedeschi

  4. Some More Details on Near Term • Update of hadronic analysis includes • event by event primary vertex including new scale factors • Ds3 (D3, D* modes in calibration sample) • + TTT triggers (if not already included) • Neural net JQT • Semileptonics in TTT • same steps as semileptonics in lepton + SVT • increases signal statistics by factor 3 • better handle on fake lepton background • revisit lifetimes – can we make a measurement? • Requested detailed plan for both analyses • we know all the steps Kroll/Bedeschi

  5. Some Comments on Longer Term • Same side (kaon) tagging • we saw a lot of interesting results here • we are making progress – productive collaboration of groups • key (as we knew already) will be assigning systematics • harder to make detailed plan – have not been through 1st pass • 2005 Data (i.e., post August 2004) • processing and data access too immature to allow timescale • we will have to validate this data and Version 6 of code • must be able to show some 2005 data in Winter 2006 • processing/incorporation of new data a serious concern Kroll/Bedeschi

  6. Some Miscellaneous Concluding Remarks • Recommend sticking with recent projections (for Oddone) • based on Winter 2005 analysis (e.g., measured t distribution) • analytic formulations match sensitivity observed in data • present signals & best projection of yields versus Linst • updated SSKT D2 (not public) • better physics simulation (Pythia tune A, MSEL=1) • better detector simulation (PID efficiency, resolution from data) • improvements from original pTrel algorithm • Next workshop • late summer or early Fall • use subgroups to report progress in the interim Kroll/Bedeschi

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