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Preparations for ICHEP (and Beyond). F. Bedeschi (INFN – Pisa) J. Kroll (Penn) CDF B Mixing Workshop 14 July 2004. Blessing ICHEP (on). Tevatron Conference (ICHEP preview). We are here (off). CDFNOTE for ICHEP. Preblessing ICHEP (on). ICHEP starts. DPF starts. Schedule.

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Preparations for ichep and beyond

Preparations for ICHEP (and Beyond)

F. Bedeschi (INFN – Pisa)

J. Kroll (Penn)

CDF B Mixing Workshop

14 July 2004



ICHEP (on)

Tevatron Conference

(ICHEP preview)

We are here (off)




ICHEP (on)

ICHEP starts

DPF starts


FPCP 4-9 Oct.

F. Bedeschi/J. Kroll

Schedule continued
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

B s mixing ingredients
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

Status semileptonic signal
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

Status hadronic modes
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

Flavor tagging
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

Combined ost in asymmetry framework1
Combined OST in Asymmetry Framework

Also quote  and D2

F. Bedeschi/J. Kroll

Proposed plan in parallel
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

3 rd cdf b mixing workshop

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