Summary of 3

rd

CDF B Mixing Workshop

Outline: 1. Reminder of Ingredients 2. Summary of Progress 3. Schedule of Tasks Joseph Kroll (Penn) & Franco Bedeschi (Pisa) Mixing Analysis Coordinators B Meeting 14 October 2004

14 October 2004 Kroll/Bedeschi B Meeting

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

1

B

s

Mixing Ingredients

From B Meeting 9/16/04

• • • • •

Reconstruct B s signal with adequate signal to noise

– semileptonic: lepton + D s – hadronic: D s  , D s  also have the equivalent B 0 & B + signals

Measure B s Lifetime

calibration/check is B 0 – resolve lifetime problem in semileptonics & B + lifetimes – demonstrate lifetime measurement in SVT-biased hadronics

Identify B s Flavor at production (flavor tagging)

– challenge: estimating D for SST in B s (for limit)

Demonstrate technique with B 0 mixing (



m d )

– use this step to calibrate opposite side flavor tags for B s – require unbinned likelihood fit now

Measure (place limit on)



m s

14 October 2004 Kroll/Bedeschi B Meeting 2

14 Oct 2004 Our Priorities

Highest Priority Items

From B Meeting 9/16/04 remain the same 1. Unbinned likelihood fit for



m d 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 D s ) 3. Measure lifetime in SVT-biased hadronic modes (D s



, etc.) in parallel with 1, 2, 3 4. Study SSKT – determine defensible D from data and MC

14 October 2004 Kroll/Bedeschi B Meeting 3

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

Summary of Progress: Signals & Data Sets

• •

Signals – source of concern

– modest progress (B s !

D s  , D s !

 & B !

D  ) – power of tracking in 5.3.1 has not been fully exploited •

e.g.,

 2 3D , 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.,

• future improvements cannot be exploited – must remake – Many other private data sets and ntuples PID) 14 October 2004 Kroll/Bedeschi B Meeting 4

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?

14 October 2004 Kroll/Bedeschi B Meeting 5

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 + , B 0 ?

14 October 2004 Kroll/Bedeschi B Meeting 6

Summary of Progress: Flavor Tagging

• •

OSTs

– OSTs defined (SLT(e), SLT(  ), JQT) – in repository –

next step clear: define combined OST & measure



D 2 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 shape , dE/dx in good

14 October 2004 Kroll/Bedeschi B Meeting 7

Summary of Progress: Likelihood Fits

•

Two groups working independently

–

MIT/Cantabria/Karlsruhe

• presented likelihood fit with SST on J/  K *0 • ambitious program to extend to

l

+ D and B !

data D  • next step: add OSTs and measure combined  D 2 , D  (with D bins) • lifetime is necessary intermediate step –

ANL/CMU

• full likelihood fit exists for \Delta m_s (see CDFNOTE 7170) • extending to  m d 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 14 October 2004 Kroll/Bedeschi B Meeting 8

Summary of Progress:



m

s

• •

One presentation specific to



m s : proposal for blinding

– preferred option: randomize B s 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 14 October 2004 Kroll/Bedeschi B Meeting 9

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 14 October 2004 Kroll/Bedeschi B Meeting 10

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 • B s !

D s  , D s !

K*K or K S K complete • finish other 7 modes by 4 Nov 2004 • B !

 +  D 0  , D0 !

K +  , K +   +  , K + K , • B 0 !

• B 0 s !

D  + , D !

D s  + , D s !

K  +  +  ,  – 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 14 October 2004 Kroll/Bedeschi B Meeting 11

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 14 October 2004 Kroll/Bedeschi B Meeting •

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?

12

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

14 October 2004 Kroll/Bedeschi B Meeting 13

Lifetimes

•

Semileptonic

– Clark, Farrington, Tanaka, Ukegawa, Uozumi – reports at Semileptonics – near term (by 4 Nov 2004 ) • Tanaka x-check of

l

+ D + • d 0 cut on D * (D + , D 0 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 14 October 2004 • •

Hadronic “MC free” approach

– Azfar, Boudreau, Huffman, Rademacher, Rahaman – reports at B hadronic – fitting test and refinement • Azfar, Rademacher • B + !

D 0  + in progress – stripping & ntuple production (data & MC) • Azfar, Rahaman • B + !

D 0  + done • B 0 , B s , &  b modes in progress • complete by 4 Nov 2004 Kroll/Bedeschi B Meeting 14

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 14 October 2004 Kroll/Bedeschi B Meeting 15

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  D 2 (including binning) on J/  K • report on 19 Oct 2004 – evaluation of more sophisticated combinations (max D, diff. classes) • time scale not established 14 October 2004 Kroll/Bedeschi B Meeting 16

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/  • use combined dE/dx & TOF particle ID • report by 4 Nov 2004 K samples

Study particle species produced around B + , B 0 , B 0 s

– 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 14 October 2004 Kroll/Bedeschi B Meeting 17

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?

) 14 October 2004 Kroll/Bedeschi B Meeting 18

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  , D3  – Fully tested with preliminary result on  m d by 1 Dec 2004 14 October 2004 •

Argonne/CMU

– Giurgiu, Paulini, Tanaka – reports to Semileptonics – full likelihood for  m s exists; used for ICHEP 04 projections – developing for  m d w

l

+ D incorporating blessed OSTs • 1 st 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 • 1 st result on  m d by 7 Dec 2004 Kroll/Bedeschi B Meeting 19

Result on



m

s

• 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 – 03 Feb 2005 – 20 Jan 2005 – 06 Jan 2005 unblind results on  m s prebless results on  m s bless results on  m d for  m s prebless results on  m d for  (Collaboration mtg.) m s • Better have full likelihood machinery for  m d determination using hadronic and semileptonic samples and OSTs

before

the Winter holiday – this includes a substantial amount of documentation prepared .

14 October 2004 Kroll/Bedeschi B Meeting 20

In Preparation for



m

s

• •

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 14 October 2004 Kroll/Bedeschi B Meeting 21

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 14 October 2004 Kroll/Bedeschi B Meeting 22

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 14 October 2004 Kroll/Bedeschi B Meeting 23

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 14 October 2004 Kroll/Bedeschi B Meeting 24

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 1 st on  m d to documented blessed results by early Jan 2005?

results • 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 14 October 2004 Kroll/Bedeschi B Meeting 25

Calendar

on week

Gasp! now we are here!

proposed B mixing workshop Collaboration meeting last Thursday meeting holiday

Better get back to work

14 October 2004 Kroll/Bedeschi B Meeting

La Thuile begins here

26