Status Report: Progress on Bs Update

1
Status Report Progress on Bs Update

• Keeping to schedule presented two weeks ago
• see slides from 29 June 2006, which are appended
  to these slides
• One significant change NN-enhanced SSKT
• CDFNOTE 8344 V2.1 see presentation today
• fractional improvement in ?D2 is 10
• sign-off (bless) next Thursday (20 July 2006)
• Semileptonic hadronic (full partial w. NN)
  have incorporated NN-enhanced SSKT
• see results today, improvement as expected
• bless for unblinding next Thursday (20 July 2006)
• semilept., fully recon. hadronics w. NN have no
  outstanding issues

2
Enhanced Schedule

• June 29th
• Bless neural net combined OST done
• Prebless SSKT with kinematic enhancement done
• Prebless semileptonics (blind) done
• Prebless fully reconstructed hadronic with neural
  net (blind) done
• July 6th
• Prebless partially reconstructed hadronic with
  neural net (blind) done
• July 13th
• Bless SSKT with kinematic enhancement status with
  NN-enhanced SSKT
• Bless semileptonic analysis blind status w.
  NN-enhanced SSKT
• Bless fully reconstructed hadronic with NN blind
  status w. NN-enhanced SSKT
• July 20th can still keep this schedule
• Bless partially reconstructed hadronic with NN
  blind
• at this stage we can unblind the amplitude scans
  and calculate significance
• July 24th
• Post updated CDF notes with unblinded result
• 1st draft of PRL circulates to Collaboration
  within 2 days behind (no draft)
• Details of what happens after this still need to
  be worked out
• accelerated review process?

3
Plans for Bs Update

• Joseph Kroll
• for the Bs Mixing Group
• 29 June 2006

4
Goal
As much sensitivity as possible with current
data on near-term time scale
Achieve by extending current analysis
(hep-ex/0606027)
Figure of merit 5?
Publish in PRL and PRD
5
Flavor Tagging
Both improvements will be added to analysis
6
Semileptonic Channels
Improve signal selection with PID add data (e,
leptonSVT)
CDFNOTE 8313 Prebless 29 June 2006 (Blind)
Summary - Remove D rejection (KK), use K id
instead - add electron triggers to 0h data -
add lepton SVT to 0h 0i data - Bs! l Ds X
increases from 37,000 to 61,000 - Sensitivity is
19.1 ps-1 - Statistical error ?(A) 0.48 _at_ ?
ms 17.25 ps-1
7
Fully Reconstructed Hadronic Channels
Improve signal selection with neural net (NN)
CDFNOTE 8333 Prebless 29 June 2006 (Blind)
Summary - more signal with same or less
background as cut-based - allowed relaxed
kinematic requirements, esp. on KK - gain in
signal signficance 35 - add new channel Bs!
Ds 3?, Ds! ??? - ?(A) 0.24 _at_ ?ms 17.25 ps-1
8
Partially Reconstructed Hadronic Channels
Add statistics with Ds? Ds? when Ds ! ??
CDFNOTE 8347 Full status 29 June 2006 Prebless
6 July 2006 (Blind)
Summary - cut-based analysis on Ds? channel, Ds
!?? - Sensitivities 17.2 (0d), 17.7 (0h), 13.6
(0i) ps-1 - ?(A) 0.60 (0d), 0.58 (0h), 0.76
(0i) _at_ ?ms 17.25 ps-1
Plan Use neural net to further improve SB
(7/6/2006)
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Plan

• With these improvements
• expect ?(A) (stat) lt 0.20 _at_ ?ms 17.3 ps-1
• 5? on A, not on p-value
• Unblind only after all improvements blessed
• Publish what we find after unblinding (unless
  mistake)
• PRL draft comes with release of unblinded result
  to Collaboration
• PRD to follow PRL (could be concurrent see
  later)

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Schedule

• June 29th
• Bless neural net combined OST
• Prebless SSKT with kinematic enhancement
• Prebless semileptonics (blind)
• Prebless fully reconstructed hadronic with neural
  net (blind)
• July 6th
• Prebless partially reconstructed hadronic with
  neural net (blind)
• July 13th
• Bless SSKT with kinematic enhancement
• Bless semileptonic analysis blind
• Bless fully reconstructed hadronic with NN blind
• July 20th
• Bless partially reconstructed hadronic with NN
  blind
• at this stage we can unblind the amplitude scans
  and calculate significance
• July 24th
• Post updated CDF notes with unblinded result
• 1st draft of PRL circulates to Collaboration
  within 2 days
• Details of what happens after this still need to
  be worked out
• accelerated review process?

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Comment on PRD

• Draft of PRD that describes submitted PRL in
  preparation
• based on public note (never released) prepared by
  Kevin Pitts
• Can also serve as draft of PRD for improved
  analysis
• submit one PRD describing either updated analysis
  or both
• We are making progress
• resources are limited
• updated analysis aiming for observation has
  higher priority