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Summary of 3 rd CDF B Mixing Workshop

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

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  1. 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

  2. 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

  3. 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

  4. 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

  5. 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

  6. 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

  7. 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

  8. 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

  9. 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

  10. 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

  11. 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

  12. 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

  13. 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

  14. 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

  15. 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

  16. 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

  17. 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

  18. 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

  19. 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

  20. 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

  21. 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

  22. 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

  23. 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

  24. 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

  25. 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

  26. 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

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