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Discussion. Joseph Kroll (Penn) Franco Bedeschi (Pisa) 25 October 2005 9 th (!) CDF B s Mixing Workshop. Issues for Discussion. Have completed 2 nd iteration of CDF  m s analysis now have a respectable sensitivity (3 rd best in world) tremendous potential from near term improvements

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Joseph Kroll (Penn)

Franco Bedeschi (Pisa)

25 October 2005

9th (!) CDF Bs Mixing Workshop

issues for discussion
Issues for Discussion
  • Have completed 2nd iteration of CDF ms analysis
    • now have a respectable sensitivity (3rd best in world)
    • tremendous potential from near term improvements
  • What do we include in next (3rd) iteration?
    • components
    • who will do the work
    • what needs to be cross-checked
    • what is the schedule
  • What are we going to publish?
    • this summer agreed we would publish 2nd iteration

Goal: produce schedule

as in Fall 2004

Kroll and Bedeschi

components of 3 rd generation analysis
Components of 3rd Generation Analysis
  • Add 2005 data
    • up to September for Winter 2006 results
    • up to shutdown (March 2006) for Summer 2006 results
  • Issues
    • production of ntuples from new data set (especially stream H)
      • could this become part of production?
    • Calibration (e.g., dE/dx, Si Alignment, TOF)
    • QC on reconstruction – need a check list here
    • higher average luminosity – how does it affect ct, dE/dx etc.
  • Would like to see yields soon
    • how has higher luminosity & evolving trigger table affected these?

Kroll and Bedeschi

3 rd generation analysis continued
3rd Generation Analysis (continued)
  • Add more decay modes
    • Ds* & Ds
      • large addition of statistics
      • almost fully reconstructed – still needs K factor
      • need to refine mass fit – backgrounds more important
  • Add more trigger paths
    • dilepton (SUSY) triggers – semileptonic decays with flavor tag
      • important if other semileptonic triggers are prescaled away
    • combine semileptonics in lepton + SVT, TTT & dilepton triggers
  • Aside (for discussion of long term plans)
    • is muon versus TTT trigger optimal (not)?
    • what about electrons versus TTT?

Kroll and Bedeschi

3 rd generation analysis continued1
3rd Generation Analysis (continued)
  • Add more flavor tags
  • Main gain here expected in SS(K)T
    • quantify dilution with Monte Carlo
      • still do not have 1st pass of systematics for any algorithm
      • new results on measured particle type fractions (B0, B+, B0s)
        • how do we use these (and further) results in evaluating systematics?
  • Opposite side tags
    • maintaining 2004 capabilities requires dE/dx and CPR for SLT(e)
    • neural net based soft lepton taggers
    • neural net opposite side tagger
    • OSKT
    • forward tracking for JQT etc.

substantial effort here

also calibrating for 2005 data

Kroll and Bedeschi

3 rd generation analysis continued2
3rd Generation Analysis (continued)
  • Other possible improvements
    • more refined model of lifetime resolution (near term)
    • hit level improvements in lifetime resolution (medium/long term)
  • We need to establish procedure for measuring ms
    • Amplitude scan versus fitting for ms
      • floating or constrained dilutions for flavor tags?
    • The procedure should go through the blessing process

Kroll and Bedeschi

issues for 3 rd later generation
Issues for 3rd (& later) Generation
  • Analysis will have many components, e.g.,
    • partially reconst. semileptonic & hadronic + fully reconst.
    • trigger paths with and without flavor tag in trigger
    • semileptonic decays in overlapping trigger paths
    • combining SST with OST (when OST in trigger path)
  • There is more to do & less physicists for analysis
  • Still we must find a way to cross-check crucial components
    • Collaboration will demand this, we should demand it ourselves
    • this has served us well in the past, e.g.,
      • 2 complete semileptonic analyses for Winter 2005
      • parallel lifetime analysis in Bs! Ds () for Winter 2005
      • cross-checks of backgrounds in semileptonics in TTT in Fall 2005
      • cross-checks of lifetime scale factors in Fall 2005

Kroll and Bedeschi

cross checking the analysis
Cross-checking the Analysis
  • Profit from related analyses:
    • B hadron lifetime measurements
      • checks mass fits
      • checks lifetime fits
      • should demonstrate we can measure lifetimes in decays collected with displaced track triggers
    • Measurements of particles species produced around B hadrons
      • allows comparison of data to Monte Carlo
        • do we see the same excess of kaons around Bs as predicted?
  • Physicists performing crucial cross-checks
    • should have their names listed with contact persons on relevant CDFNOTEs put forward for blessing in Bs mixing analysis

Kroll and Bedeschi

  • For 2nd Generation analysis – we agreed
    • not to cut corners – go for publication quality (we succeeded)
    • publish the limit if sensitivity was respectable (it is)
  • Problem:
    • limited physicist resources
    • physicists working on 2nd generation want to work on 3rdnow
    • do not want to be distracted by godparents asking questions
  • Proposal:
    • proceed with publication now – need it for 3rd generation too
    • young physicists need publication for careers
      • 3rd iteration might take longer than planned
    • paper could be written/driven by 3rd party

Kroll and Bedeschi

  • 2nd generation complete – respectable sensitivity
  • Main upgrades for 3rd generation (Winter/Summer 06)
    • add 2005 data
    • add partially reconstructed hadronic decays
    • add same side tag
    • combine semileptonic decays from multiple trigger paths
  • Must ensure cross-checks of crucial components of analysis
  • Publication
    • proceed with publication (short PRD) of 2nd generation
    • prepares us for expedient publication of 3rd generation

Kroll and Bedeschi