BABAR Status

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BABAR Status Plans

• David B. MacFarlane
• SLAC EPAC Meeting
• January 25, 2006

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Pillars of BABAR physics program

• Highly constrained and redundant set of precision
  tests of weak interactions in the Standard Model
• Searches for physics beyond the Standard Model in
  a well understood characterized environment

• Full program of flavor physics/CP violation
  measurements will provide a legacy of fundamental
  constraints on future New Physics discoveries

• Sensitivity to New Physics at LHC mass scales
  through rare decays and CP violation
• Discovery potential from large data sample across
  a whole range of beauty, charm, tau, two-photon,
  ISR physics

Challenging measurements at the edge of
sensitivity benefit enormously from operation of
both PEP-II KEK B Factories
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The BABAR Collaboration 11 Countries 80
Institutions 623 Physicists
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BABAR Belle physics results
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Integrated data sample to date
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PEP-II overall parameters and goals
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PEP-II overall parameters and goals
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Projected data sample growth
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Integrated Luminosity fb-1
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12
Lpeak 9x1033
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IFR upgrade with LSTs
Bottom top sextants installed summer
2004 Remaining sextants delayed until fall 2006
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Weak Interaction in Standard Model
Unitarity Triangle as a summary of Standard Model
b physics
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Classic indirect constraints
2008 5
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Weak Interaction in Standard Model
Unitarity Triangle as a summary of Standard Model
b physics
CKM elements quark masses are fundamental
constants emerging from EW symmetry breaking
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CPV in charmonium modes
Interference of b c tree decay with mixing
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CPV in charmless modes
Interference of suppressed b u tree decay with
mixing
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Remarkably good progress on gamma!
Interference of color-allowed and
color-suppressed tree decays
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Direct CP violation measurements
2008 2
2008 10o
2008 5-10o
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UT from sin2b indirect constraints
Overconstrained growing set of independent
measurements are consistent with CKM picture
Now looking for New Physics as correction to CKM
Paradigm change!
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UT from CP violation measurements alone
New B Factory milestone Comparable UT precision
from CPV in B decays alone
Overconstrained subsets of measurements can be
used to test for new physics
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CPV in Penguin Modes
Another implication of overconstrained redundant
approaches to same CKM parameter
Interference of suppressed b s Penguin decay
with mixing
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Potential New Physics contributions
Internal Penguin
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Revealing new physics
B Factory
LHC
Squark mass matrix (d sector)
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Summary after summer 2005 updates
Charmonium
s-Penguins
Summer 05 results
2.4s between CP violation in s-penguin vs sin2b
(cc)
No sign of Direct CP
About 0.5s loss vs Winter 2005 due to shift in
charmonium average
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BABAR CKM physics goals
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Global CKM fit 2008
95 contours
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Projections to summer 2008
Luminosity expectations
2004240 fb-1 20081.0 ab-1
Kg
f0KS KSp0 jKS hKS KKKS
5s discovery region if non-SM physics is 0.30
effect
2008
2004
Golden modes reach 5 sigma level
Projections are statistical errors only but
systematic errors at few percent level
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UT constraints in 2008
95 contours
now
Assumption no NP in trees almost any NP model
Significant constraint on all New Physics models
in LHC era
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Bounds on new physics in Bd mixing
Introduce new physics in mixing diagram
Mass scale being probed for unit
coupling L(now) 5 TeV L(2008) 10TeV
Model independent
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BABAR rare decay physics goals
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New CKM constraints in sight
2008 Possible discovery
Possible discovery 2007
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Complementarity with LHC
2008
today
Approx
2HDM
Constraints from B tn, B sg
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BABAR Physics Goals
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Lepton-flavor violation mSUGRA
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Summary Physics plans for BABAR

• Goal for 2005-2006 double current data set
• Delay in Run 5 can be overcome by summer 2006
  with extended running period, with substantial
  reduction in errors on CP violation asymmetries
  in rare decay modes
• Error on average of Penguin modes should reach
  0.06
• Goal for 2007-2008 double again to 1 ab-1
• Individual Penguin modes with errors in range
  0.06-0.12
• Suite of fundamental Standard Model measurements
  with substantially improved levels of precision
• Beyond 2008 might offer exciting opportunities if
  New Physics has been seen by B Factories LHC

• Sensitivity to New Physics through rare decays,
  CP violation, large data sample with a
  significant discovery potential
• Full program of flavor physics/CP violation
  measurements provide fundamental constraints on
  future New Physics discoveries

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• Backup Slides

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A day in the life of a B Factory
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PEP-II performance peak luminosity
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BABAR Detector
EMC 6580 CsI(Tl) crystals
1.5T solenoid
e (3.1GeV)
DIRC (PID) 144 quartz bars 11000 PMs
Drift Chamber 40 layers
e- (9GeV)
Silicon Vertex Tracker 5 layers, double sided
strips
Instrumented Flux Return Iron / Resistive Plate
Chambers or Limited Streamer Tubes (muon /
neutral hadrons)
Collaboration founded in 1993 Detector
commissioned in 1999
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DCH electronics upgrade

• Motivation
• Remove anticipated deadtime problem due to
  serialization and shipping of data from DCH to
  readout module
• Upgrade in two steps
• Phase 1 (summer 2004) L1 to 4kHz
• Reduce ADC payload (32?16 bytes) from front ends
  with no impact on dE/dx performance
• Phase 2 (Oct 2005) L1 to 5kHz
• Larger FPGA to allow feature extraction on DCH
  endplate
• New boards installed in Oct down, ready to
  activate FPGA code

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