BaBar Overview & Plans
Hassan Jawahery, spokesperson University of Maryland
SLAC Program Review July 7, 2008
1#
Outline
Status of the Experiment
Status & Evolution of Run 7 Physics Reach of the data on Upsilon Resonances
Status of the collaboration BaBar Physics and goals
Details & in-dept coverage of recent BaBar physcis in Soeren Prell’s talk
Future plans
2#
The setup of the experiment:
Operating at the U(4s) resonance
Help from Quantum Mechanics: U(4S)B0B0 with C=-1; The system remains entangled as it evolves. Critical for determining flavor of B0 when it decays in a CP eigenstate mode.
B0-B0 Oscillation & inteference of mixing and decay allows extraction of time-dependent CP asymmetry.
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Status & Evolution of Run 7
Run 6 concluded on September 3rd, 2007:
Downtime: Sept. 3- December 3, 2007
Integrated lumi= 86/fb Repairs and maintenance work on BaBar subsystems during the downtime, but no major upgrade this time. Significant work on PEPII to prepare for higher beam currents & the luminosity regime of 2x1034 /cm2/s.(John Seeman’s talk) Expectation for run 7: 250/fb (50% increase in total data) nearly a 3-fold increase in the data with fully upgraded muon ID.
Start of Run 7:
BaBar shifts started Dec. 3rd stored beams in PEPII Dec. 9th Accumulated ~0.6/fb on the 4S Budget news on Dec. 17 - Switched to U(3S) running on Dec. 21. Received a 2-month extension of the run in response to the physics case for 3S & another month on 2S & scan above 4S. Run 7 concluded on April 7th.
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Status of the Experiment
Conclusion of run 7 & the data taking phase of BaBar: On April 7, 2008
~5/fb scan above 4S
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The Run 7 on Upsilon physics
~30/fb Y(3S) run 14.5/fb Y(2S) run ~5/fb scan above the 4S
Some of the key measurements aimed at from this data: Ground state of bottomonium hb Invisible width of U(1S) Measurement of R vs S above the U(4S) and paramters of “5S”, “6S”, and other interesting structures …. Search for anomalies and
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Search for light Higgs/exotica
More on Run 7 on Upsilon resonances
The run began in the evening of Dec. 21the 3S found within a day. The physics goals required significant changes to both L1 and L3 triggers: For 3Spp(1S); (1S)invisible efficiency : was 18% to final ~80% For U(3S)g (invisible)
3S found by Dec. 22.
lowering the energy threshold as much as practically possible- within limits of L1 & L3 rates ( L1 <7 KHz)
Run condition more difficult with higher trigger rate/deadtime - all worked fine at the end.
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Energy spectrum of g’s from U(3S)
First Observation of hb meson
More details in S. Prell’s talk next & P. Grenier (tomorow) 3SgcbJ(2P) ->g 1S
Background subtracted hb peak
ISR g
3sg hb
>10 s significance (incl. systematics)
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Status of BaBar Detector
Now in a transition phase- preparing for the Minimum Maintenance State (MMS):
Flammable gas & cooling water to be removed from all subdetector- mostly done. Nitrogen/Dry air flowing Special monitoring system being developed- expect completion by mid-august. Our 200-core online farm is in use for event simulation. Some dismantling will take place during the MMS The collaboration will have the ownership of the detector till end of MMS Discussions are underway with International Finance Committee for transfer of ownership to the lab at the end of MMS. The lab will assume the responsibility for D&D.
Planning for the D&D and its timing underway
More in break-out sessions on D&D.
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Status of the Collaboration
10#
Status of the Collaboration
74 Institutions in 10 countries
Faculty Canada France Germany 10 14 7 12 4 PhD Staff Postdoc 2 3 1 Grad 7 12 15 4 Non-PhD Totals 19 45 27
Italy
Netherlands Norway Russia Spain United Kingdom United States
27
1 2 2 18 72
28
15
14
1 1
84
2 3 1 1 19 11 8 44 242
6 3 1 47 2 12 40
2 3 12 64
Totals
153
101
75
131
25
485
Although fewer babarians than last year, with more than 200 students and postdocs the collaboration continues to be on a very strong foundation.
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USA
California Institute of Technology UC, Irvine U of Tennessee UC, Los Angeles U of Texas at Austin UC, Riverside UC, Santa Barbara U of Texas at Dallas U of Wisconsin UC, Santa Cruz U of Cincinnati U of Colorado Colorado State Canada [4/19] Italy [12/83] Harvard U INFN, Bari University of British Columbia U of Iowa INFN, Ferrara McGill University Iowa State U Lab. Nazionali di Frascati dell' INFN University de Montréal Johns Hopkins U INFN, Genova & Univ University of Victoria LBNL INFN, Milano & Univ LLNL INFN, Napoli & Univ INFN, Padova & Univ U of Louisville France [5/41] INFN, Pisa & Univ & Scuola U of Maryland LAPP, Annecy Normale Superiore U of Massachusetts, Amherst LAL Orsay LPNHE des Universités Paris VI et VII INFN, Perugia & Univ MIT INFN, Roma & Univ "La Sapienza" Ecole Polytechnique, Laboratoire U of Mississippi INFN, Torino & Univ Leprince-Ringuet SUNY, Albany INFN, Trieste & Univ CEA, DAPNIA, CE-Saclay U of Notre Dame Ohio State U The Netherlands [1/2] Germany [6/28] U of Oregon NIKHEF, Amsterdam Ruhr Universitaet Bochum Princeton U Universitaet Dortmund SLAC Technische Univeritaet Dresden Norway [1/3] U of South Carolina Universitaet Heidelberg U of Bergen Stanford U Universitaet Rostock Universitaet Karlsruhe
[32/223]
The BABAR Collaboration
Russia Spain
Budker Institute, Novosibirsk
[1/11] [2/7]
10 Countries 74 Institutions 459 Physicists
IFAE-Barcelona IFIC-Valencia
United Kingdom
U of Birmingham Brunel U U of Edinburgh U of Liverpool Imperial College Queen Mary , U of London U of London, Royal Holloway U of Manchester Rutherford Appleton Laboratory U of Warwick
[10/43]
November 10, 2007
BaBar Physics
13#
A look at the timeline of BaBar’s physics publications
351 papers published/submitted 70 papers in 2007 & 24 in 2008 130 abstract at ICHEP2008
>200 Ph.D. Thesis
70 60 50 BaBar 40 30 20 10 0 2000 2001 2002 2003 2004 2005 2006 2007 2008 Belle LEP/4 Tev/2 CLEO
>300 Postdocs so far
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The whole of BaBar Data
BaBar collects ~97% of PEP II delivery
Partial composition of the data
~ 0.5 x10
9
BB
~ 0.5 x10
9
cc
~ 0.5 x10
Run 7:The U Run
9
9
-
1.5 10 e e q q ISR
With ~ 30/fb on 3S & ~ 14/fb on 2S ~ 1.2 10 U (3S)
8 8
~ 1.0 10 U (2S) ~ 5 10 U (3S) pp U (1S)
6 7
~ 5 10 U (2S) pp U (1S)
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The physics reach of the BaBar Data
Just about any physics that is accessible at The Principal Mission
s 10 GeV
•CP breaking in B decays •Test the CKM paradigm •Search for New Physics in SM suppressed decays
CP Studies with B’s
New unexplained States: X,Y,Z’s
& B Physics
Charm Physics D0 Mixing, New States,FDs Lepton Flavor Violation Tau physics Continuum e+e- hadrons ISR: e+e- hadrons from threshold to ~5 GeV
Measuring the hadronic part of photon vacuum polarization
16#
A list of topics on BaBar’s “core” physics program The ultimate job on CKM – until the SuperB era The no-stoneunturned search for New Physics A major effort underway to perform these measurements
~ 2/3 of the core measurements performed with <1/2 of the full dataset
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Expansion of the “Core” physics: The Physics Reach of the data at Upsilon Resonances •Sensitivity to New Physics effects:
Invisible width of U(1S):
Significant enhancement possible due coupling to: light dark matter (such as motivated by the INTEGRAL anomaly) exotic light higgs(e.g. CP-odd higgs in NMSSM)
Related channels
•Lepton Universality:
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Conservative estimates of Physics sensitivies
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The Physics Reach of the data at Upsilon Resonances (cont.)
•Bottomonium spectroscopy: an unfinished program
The data set is comparable to the largest set on charmonium decays58 Million at BES
The measurements are of significant interest to tests of LQCD and potential models Observe as-yet unseen new states and transitions including: singlet states- e.g. hb & hb & suppressed M1 transitions
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The Analysis-Computing strategy
The task at hand More than 100 core physics measurements currently ~250 ongoing analyses
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Analysis-Computing program: A few analysis realities 2/3 of BaBar’s core physics measurements have been performed with less than ½ of the full data set. Nearly all core physics channels are covered with active analysts.
We have had a large peak in analysis activity in the past few months:
A large set of physics results from the 4S data on the core channels will be presented at summer 2008 conferences Our goal is to present preliminary results on some of the key elements of 3S physics at ICHEP 2008.
We already know that at least 20 of the 4S “core” physics measurements will use the fully reprocessed data set.
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Analysis-Computing planning
Detailed assessments of the physics goals, required resources, timing, and manpower were done in the past two years: Generated documents on BaBar Physics Reach and a plan for analysis-computing Beyond 2008
The core of the plan: an Intense-Analysis Period (2009-2011) to perform the “core” measurements
Conclusion of a series of workshops on potential benefits of full reprocessing. Detailed study of computing resources needed to carry-out the program. A study of the BaBar computing manpower needs & its time profile.
23#
Analysis-Computing program: Data Processing:
Current status
In 2007, completed a special processing (TrkFixup) of runs 1-6 & the associated simulation. This constitutes the main data for 4S analyses planned for summer 2008 conferences. After a series of workshops in 2007, we developed the final BaBar reconstruction code (release 24)- and began the validation program. The release-24 was used in processing the 3S, 2S and the scan. We are now reprocessing all 4S data aiming for early fall completion.
24#
Final processing and reprocessing of the data:
Analysis-Computing program
We have planned for a period of ~2 (perhaps 3) years of intense analysis activity following the end of the data taking. The key element of the program is the continuing availability of the computing resources (hardware and manpower) at SLAC & the 5Tier-A centers. This strategy is consistent with BaBar physics goals and the manpower realities of the experiment: The key players in the analyses effort are the current postdocs and graduate students, whose life span in the experiment is the next 2-3 year. The success of this program depends on keeping a coherent and well coordinated effort- as it has been throughout the life of the experiment. A strong SLAC centered analysis effort is crucial.
The intense-Analysis Activity has already begun
We expect the analysis life of the experiment to go on for another 2 to 3 years beyond this period- the plan assume SLAC centered computing resources beyond 2010.
25#
With the early termination of Run 7 on the 4S, the 1/ab phase of BaBar is now set at ~0.5/ab:
Summary remarks
Even so, an enormous amount of physics still to come from the analysis of the 4S data- although less than the goal of the collaboration for the full data set with the upgraded detector. The majority of our core physics measurements will be updated in an intense-analysis period of 2 (or 3) yrs- already started.
The Run 7 data on Upsilon resonances expands the physics reach of the program with unique opportunities in the quarkonium spectroscopy and searches for effects of New Physics.
Our first discovery: The bottomonium ground state: hb
The collaboration is healthy with a strong base of students and postdocs- more than 130 Ph.D. thesis in the pipeline. Planning for longer term (beyond 2010) is underway.
Strong support for the Intense-Analysis Period is vital to the program.
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