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Summary of 3 rd CDF B Mixing Workshop. Outline: Reminder of Ingredients Summary of Progress Schedule of Tasks. Joseph Kroll (Penn) & Franco Bedeschi (Pisa) Mixing Analysis Coordinators B Meeting 14 October 2004. Fort Ebey, Whidbey Island, WA, in the Puget Sound 90 miles from the Pacific.

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summary of 3 rd cdf b mixing workshop
Summary of 3rd CDF B Mixing Workshop
  • Outline:
  • Reminder of Ingredients
  • Summary of Progress
  • Schedule of Tasks

Joseph Kroll (Penn) & Franco Bedeschi (Pisa)

Mixing Analysis Coordinators

B Meeting

14 October 2004

Kroll/Bedeschi B Meeting

Fort Ebey, Whidbey Island, WA, in the Puget Sound 90 miles from the Pacific

b s mixing ingredients

From B Meeting 9/16/04

Bs Mixing Ingredients
  • Reconstruct Bs signal with adequate signal to noise
    • semileptonic: lepton + Ds
    • hadronic: Ds, Ds
  • Measure Bs Lifetime
    • resolve lifetime problem in semileptonics
    • demonstrate lifetime measurement in SVT-biased hadronics
  • Identify Bs 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 for Bs
    • require unbinned likelihood fit now
  • Measure (place limit on) ms

also have the equivalent B0 & B+ signals

calibration/check is B0 & B+ lifetimes

Kroll/Bedeschi B Meeting

highest priority items

14 Oct 2004

Our Priorities

remain the same

From B Meeting 9/16/04

Highest Priority Items
  • Unbinned likelihood fit for md exploiting fully power
  • of flavor tags, event by event t, S/B in different modes, etc.

to accomplish 1. we must

2. Resolve lifetime problem in semileptonic modes (l Ds)

3. Measure lifetime in SVT-biased hadronic modes (Ds, etc.)

in parallel with 1, 2, 3

4. Study SSKT – determine defensible D

from data and MC

Kroll/Bedeschi B Meeting

1st Street Ocean City, NJ, Feb. 7 2004

summary of progress signals data sets
Summary of Progress: Signals & Data Sets
  • Signals – source of concern
    • modest progress (Bs! Ds, Ds! & B! D)
    • power of tracking in 5.3.1 has not been fully exploited
      • e.g.,23D, event by event PV, L00
      • see M.D. Shapiro @ BPAK on 8 Oct 2004
    • still only data up to 13 Feb 2004 – no post COT recovery data
  • Data Sets – source of significant concern
    • B hadronic skim
      • only 70% complete up to 13 Feb 2004
      • no post COT recovery data available
    • B Sntuples
      • need to be remade with new OSTs and other improvements (e.g., PID)
      • future improvements cannot be exploited – must remake
    • Many other private data sets and ntuples

Kroll/Bedeschi B Meeting

summary of progress lifetimes 1
Summary of Progress: Lifetimes (1)
  • Semileptonic Lifetimes
    • dedicated core of people: Clark, Farrington, Tanaka, Ukegawa, Uozumi
    • set up list of tasks on 8 September 2004
    • already covered significant fraction of those tasks – continued steady progress since the workshop
    • still have not found the problem – direct charm background appears to have been eliminated as a candidate
    • SVT efficiency bias? Background model? Combination of two?

Kroll/Bedeschi B Meeting

summary of progress lifetimes 2
Summary of Progress: Lifetimes (2)
  • Hadronic Lifetimes – “Monte Carlo free” approach
    • have overcome many technical obstacles to produce viable method
    • limited progress, however, since last presentation in July 2004
    • Dedicated group of people now back in action: Azfar, Boudreau, Huffman, Rademacher, Rahaman
    • clearly defined tasks within this group – schedule defined
    • Do we get the right answer? Is this approach viable for mixing?
  • Hadronic Lifetimes – SVT efficiency approach
    • limited progress since last presentation in July 2004
    • Dedicated group of people being assembled at FNAL to attack: DaRonco, Donega, Giagu, Giolo (Lucchesi @ Padova)
    • need to define a more detailed list of tasks and schedule
    • Same burning issue: do we get the right answer in B+, B0?

Kroll/Bedeschi B Meeting

summary of progress flavor tagging
Summary of Progress: Flavor Tagging
  • OSTs
    • OSTs defined (SLT(e), SLT(), JQT) – in repository
    • next step clear: define combined OST & measure D2 in data
    • no further development expected for Winter 2005
  • SS(K)T
    • ambitious plan outlined to estimating D from combo. of data & MC
    • dedicated group: see list in later slides under “schedule.”
    • progress on several fronts & short term goals defined:
      • particle id around B mesons measured in data
      • comparison: fragmentation particles around B’s in data vs. MC
      • establish B** signal – at least at PR level
    • Particle id crucial – TOF calibration a concern, dE/dx in good shape

Kroll/Bedeschi B Meeting

summary of progress likelihood fits
Summary of Progress: Likelihood Fits
  • Two groups working independently
    • MIT/Cantabria/Karlsruhe
      • presented likelihood fit with SST on J/ K*0 data
      • ambitious program to extend to l + D and B! D, D
      • next step: add OSTs and measure combined D2 (with D bins)
      • lifetime is necessary intermediate step
    • ANL/CMU
      • full likelihood fit exists for \Delta m_s (see CDFNOTE 7170)
      • extending to md on l + D (sample composition, implement OSTs)
      • Basic functionality of fit demonstrated with toy MC
      • next steps: signal optimization, add OSTs, evt-by-evt vtx, L00
      • lifetime is necessary intermediate step

Kroll/Bedeschi B Meeting

summary of progress m s
Summary of Progress: ms
  • One presentation specific to ms: proposal for blinding
    • preferred option: randomize Bs flavor at decay with (-1)event no.
    • need to follow up with written proposal that is approved at B meeting
  • Discussion of need for common input file for various fitters
    • need to follow up with written proposal that is approved at B meeting
    • seems trivial, but will serve as a method of making sure we are speaking a common language

Kroll/Bedeschi B Meeting

schedule
Schedule
  • We have put together a list of tasks
  • Each task has
    • list of people doing the work
      • these people are considered “responsible” for delivering
    • the venue where they report the results of their work
      • specify the subgroup or B group
    • the various near term tasks including time estimates
    • long term tasks have more vague time estimates
  • Weekly status reports
    • we want status reports at subgroups on key tasks every week
    • does not have to be full presentation, can be one slide on previous week’s activities

Kroll/Bedeschi B Meeting

data sets
Data set definition

5.3.X

all data up to August 2004 shutdown except COT compromised

Good run list

Furic & Nahn

reports at BPAK

by 4 November 2004

Skim of SVT two track data set

Belforte, Casarsa, Delli, Fella, Lucchesi

reports at BPAK

2 sections of the data

up to 13 February 2004

after COT recovery

Skim (continued)

Status of data up to 13 Feb 2004

Bs! Ds, Ds! K*K or KSK complete

finish other 7 modes by 4 Nov 2004

B-! D0-, D0! K+-, K+-+-, K+K-, +-

B0! D-+, D-! K-++

B0s! Ds-+, Ds!, 

post COT recovery data

processing in parallel with above

complete by end of November 2004

Some modes not included

e.g., B! D* & D

can be added – no time estimate

Data Sets

Kroll/Bedeschi B Meeting

data sets continued
B Sntuple

Paus

reports at BPAK

based on 5.3.1

includes all modes

will include all data to Aug 2004

J/ K by 18 Oct 2004

lepton + D by 26 Oct 2004

B hadronic by 8 Nov 2004

Direct access to data (datlists)

Furic & Paus

reports at BPAK

available 1 Dec 2004

Comments

must do better for Summer 05 & beyond

need to start organizing this now

volunteer (BPAK) needed

for Winter 2004 success of datlists is critical

B sntuple

no update of TOF possible

event by event PV, L00 not included in present production

1 Oct 2004: Ch. Paus reports 30 pb-1 data bad due to CMX – use anyway?

Data Sets (continued)

Kroll/Bedeschi B Meeting

signal optimization
Signal Optimization
  • Hadronic modes
    • Casarsa, Lucchesi, Squillacioti, Shapiro
    • reports at B Hadronic
    • complete by 4 Nov 2004
  • Semileptonic modes
    • Gibson
    • reports at Semileptonics
    • update on 26 Oct 2004
    • schedule for finalizing not established

Concern: inadequate personnel and coming too late

Kroll/Bedeschi B Meeting

lifetimes
Semileptonic

Clark, Farrington, Tanaka, Ukegawa, Uozumi

reports at Semileptonics

near term (by 4 Nov 2004)

Tanaka x-check of l + D+

d0 cut on D* (D+, D0 too?)

generate more c-cbar MC

result in 8 GeV (no SVT)

long term (no estimate)

have to see results of near term to decide how to proceed

Hadronic

“MC free” approach

Azfar, Boudreau, Huffman, Rademacher, Rahaman

reports at B hadronic

fitting test and refinement

Azfar, Rademacher

B+! D0+ in progress

stripping & ntuple production (data & MC)

Azfar, Rahaman

B+! D0+ done

B0, Bs, &b modes in progress

complete by 4 Nov 2004

Lifetimes

Kroll/Bedeschi B Meeting

lifetimes continued
Hadronic “MC free” continued

Systematics

alignment (Boudreau, Rahaman)

SVT eff. (Azfar, Rademacher)

background parameterization (Huffman, Rademacher)

all in progress already for B+ mode – done by 4 Nov 2004

others follow later

Hadronic – SVT eff. method

Da Ronco, Donega, Giagu, Giolo, Lucchesi

update SVT  curves by

4 Nov 2004

preliminary result (lifetime okay or not okay) by 22 Nov 2004

Lifetimes (continued)

Kroll/Bedeschi B Meeting

opposite side flavor tags
Opposite Side Flavor Tags
  • Validation of blessed Summer 2004 SLT(), SLT(e), JQT
    • Kravchenko
    • reports at Semileptonics
    • means putting taggers in repository & verifying we get the same results
    • complete by 19 Oct 2004
  • Creation of simple combination of above tags
    • Kravchenko
    • reports at Semileptonics
    • determine tag overlaps and combined  D2 (including binning) on J/K
      • report on 19 Oct 2004
    • evaluation of more sophisticated combinations (max D, diff. classes)
      • time scale not established

Kroll/Bedeschi B Meeting

same side kaon tag
Same Side (Kaon) Tag
  • Further development of SS(K)T
    • Bedeschi, Catastini, Punzi, Scuri, Squillacioti
    • reports to Semileptonics
    • compare SS(K)T algorithms in data & MC using J/ K samples
      • use combined dE/dx & TOF particle ID
      • report by 4 Nov 2004
  • Study particle species produced around B+, B0, B0s
    • Heijboer, Jones, Kroll, Usynin
    • reports to Semileptonics
    • Measure particle species in data
      • initial report using private TOF calibration in July 2004
      • further progress requires updated TOF calibration and B Sntuples
    • MC production in parallel – estimate Dec 2004

Kroll/Bedeschi B Meeting

same side kaon tag continued
Same Side Kaon Tag (continued)
  • Comparison MC & data, tuning fragmentation
    • Ben-Haim, Maksimovic, Pursley
    • reports to Monte Carlo & Semileptonics
    • update on 4 Nov 2004
  • B**
    • Ben-Haim, Maksimovic, Pursley
    • reports to J/ & B hadronics
    • signal in B+! J/ K+ (update 4 Nov 2004)
    • signal in SVT hadronic samples (December?)

Kroll/Bedeschi B Meeting

likelihood fitting for m d
MIT/Cantabria/Karlsruhe

Belloni, Gomez-Ceballos, Kravchenko, Leonardo, Paus, Piedra

reports to Semileptonics

likelihood fit B!J/ K with SST exists – see last workshop

need to add OSTs

developing fits for l + D &

D, D3p

Fully tested with preliminary result on md by 1 Dec 2004

Argonne/CMU

Giurgiu, Paulini, Tanaka

reports to Semileptonics

full likelihood for ms exists; used for ICHEP 04 projections

developing for md w l + D incorporating blessed OSTs

1st version fit working and tested on toy MC – see last workshop

working on including tagging & vertexing in data ntuple – report at 4 Nov 2004

run on MC to determine add. K factors: 30 Nov 2004

1st result on md by 7 Dec 2004

Likelihood Fitting for md

Kroll/Bedeschi B Meeting

result on m s
Result on ms
  • Difficult to work this far ahead – we can work backwards from La Thuile & draw some conclusions:
    • 24 Feb 2005 last day to bless results for La Thuile
    • 17 Feb 2005 unblind results on ms
    • 03 Feb 2005 prebless results on ms
    • 20 Jan 2005 bless results on md for ms (Collaboration mtg.)
    • 06 Jan 2005 prebless results on md for ms
  • Better have full likelihood machinery for md determination using hadronic and semileptonic samples and OSTs before the Winter holiday – this includes a substantial amount of documentation prepared.

Kroll/Bedeschi B Meeting

in preparation for m s
In Preparation for ms
  • Decision on blinding procedure
    • Punzi
    • reports to B meeting
    • written proposal submitted to B group before 4 Nov 2004
    • present at workshop on 4 Nov 2004, sign off at following B meeting
  • Quantities for input to likelihood fit (flat file content)
    • Kravchenko & Tanaka
    • reports to semileptonics
    • written proposal submitted to B group before 4 Nov 2004
    • present at workshop on 4 Nov 2004

Kroll/Bedeschi B Meeting

common tools
Common Tools
  • dE/dx in COT
    • COT dE/dx group (Giagu)
    • reports to BPAK group
    • validation of entire data set up to Aug 2004 shutdown in progress
    • ready for 5.3.4 release on 29 Oct 2004
  • TOF
    • TOF group (Snider)
    • reports to BPAK group
    • in process of revising/validating calibration schemes
    • hope to be ready for 5.3.4 release on 29 Oct 2004

Kroll/Bedeschi B Meeting

common tools continued
Combined dE/dx & TOF PID

Ciocci, Morello, Punzi, Squillacioti, Tonelli

reports to BPAK

available now in private version: resolution functions for each particle type separately for dE/dx & TOF

include in public code infrastructure by 18 Oct 2004 – validate

include in 5.3.4 release on 29 Oct 2004

include combination of TOF and dE/dx for 29 Oct 2004 release

demonstrate utility with examples by 4 Nov 2004

Event by Event Vertexing incl. L00

Cerri, Lucchesi, Shapiro

reports to BPAK

code available & will be in 5.3.4 rel.

documentation by 4 Nov 2004

Common Tools (continued)

Kroll/Bedeschi B Meeting

monte carlo production
Monte Carlo Production
  • Oversight of Monte Carlo Generation/Production
    • D’Auria
    • reports to Monte Carlo
    • outstanding issues
      • existing MC samples produced by various groups privately not registered
      • only aware of one collaborative effort to generate MC for semileptonics
        • see talk by Usynin at semileptonics subgroup on 28 Sep 2004

Kroll/Bedeschi B Meeting

some concluding remarks
Some Concluding Remarks
  • We have made progress assigning tasks and making a schedule
  • The schedule needs to be studied further to see if we are on target to have a result for Winter 2005
  • Particular concern is Dec 2004 – how do we go from 1st results on md to documented blessed results by early Jan 2005?
  • Two more workshops planned in 2004
    • November 3 & 4
      • off week – we thought it would help to spread the pain over 2 days
    • December 16

Kroll/Bedeschi B Meeting

calendar
Calendar

Gasp! now we are here!

on week

proposed

B mixing

workshop

Collaboration

meeting

last Thursday

meeting

holiday

Better get back to work

La Thuile begins here

Kroll/Bedeschi B Meeting