Preparations for ICHEP (and Beyond)

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