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Bs Mixing Workshop and ICHEP Preparations

Join us for a comprehensive workshop on Bs mixing, flavor tagging, and signal reconstruction techniques. Update on Winter 2004 PR plots and proposed plans for ICHEP and beyond. Explore different decay modes and tagging strategies.

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Bs Mixing Workshop and ICHEP Preparations

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  1. Preparations for ICHEP (and Beyond) F. Bedeschi (INFN – Pisa) J. Kroll (Penn) CDF B Mixing Workshop 14 July 2004

  2. Blessing ICHEP (on) Tevatron Conference (ICHEP preview) We are here (off) CDFNOTE for ICHEP Preblessing ICHEP (on) ICHEP starts DPF starts Schedule FPCP 4-9 Oct. F. Bedeschi/J. Kroll

  3. Schedule (continued) • CDFNOTE for ICHEP should be posted Monday 19 July • Preblessing for ICHEP should be Thursday 22 July • CDFWEEK 26-30 July (B meeting Fri. 30 July) • Blessing for ICHEP should be Thursday 5 August • Presentation of ICHEP results at FNAL on 9-10 August • ICHEP 16-22 August • Thurs. 12 Aug. (off-week) could use for final sign-off if necessary • Discouraged: speakers might not accept such late results • DPF 26-31 August • Last possible blessing 19 Aug. (on-week) • Next opportunity: FPCP (Korea) 4-9 October F. Bedeschi/J. Kroll

  4. Bs Mixing Ingredients • Reconstruct signal with adequate signal to noise • semileptonic • hadronic • Measure Lifetime • challenge: including bias due to SVT trigger • Identify B Flavor at production (flavor tagging) • challenge: estimating D for SST in Bs (for limit) • Demonstrate technique with B0 mixing (md) • use this step to calibrate opposite side flavor tags • eventually require likelihood fit • Measure (place limit on) ms F. Bedeschi/J. Kroll

  5. Status: Semileptonic Signal Have blessed PR plots from Winter 2004 4.8 processing Various modes: Do not know exactly how they contribute to sensitivity (e.g., K*K) F. Bedeschi/J. Kroll

  6. Status: Hadronic Modes Blessed: 4.8 processing Workshop: 5.1 processing 232 § 18 240 pb-1 Update Ds PR plot What about other decay modes? F. Bedeschi/J. Kroll

  7. Flavor Tagging • Blessed • Soft muon tag (binned in pTrel) • Jet charge tag (binned in Qjet) • SST (following Run I prescription) • In preparation • improved soft muon tag (likelihood based – binned) preblessed 24 June • soft electron tag (likelihood based - binned) • jet charge (with jet probability, trying new jet finding) • improved SST (with binning in pT track) • OSKT, SSKT – under study – not ready for ICHEP • Combination • combined blessed SLT() and JQT • use asymmetry framework – no binning (underestimate ultimate D2) F. Bedeschi/J. Kroll

  8. Combined OST in Asymmetry Framework F. Bedeschi/J. Kroll

  9. Combined OST in Asymmetry Framework Also quote  and D2 F. Bedeschi/J. Kroll

  10. Proposed Plan (in parallel) • Prebless/bless SLT(e) & updated SLT(), JQT • Prebless/bless binned asymmetry fit with OST (& SST) • goal is to show OST works for mixing – use blessed OST’s & SST • underestimates OST tagging power (not binned) • may add additional exclusive hadronic modes (D*, D) • Prebless/bless unbinned likelihood fit • 1st step is J/K (no SVT bias, lifetime checked) • 2nd step is D (include SVT efficiency in likelihood) • have to show that we get the correct lifetime • 3rd step is lepton + D • must include term for cc background & give correct lifetime • Allows binned flavor tags with correct accounting for correlations F. Bedeschi/J. Kroll

  11. FPCP 2004 Next workshop will be during one of these two (on-) weeks 3rd CDF B Mixing Workshop Goal: organize for 1st Bs mixing results for Winter 2005 F. Bedeschi/J. Kroll

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