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Physics at BABAR and Future Plans

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Best week. 4.200 fb-1. Best month. 16.02 fb-1. Best 30 days. 16.05 fb-1. BABAR logged. 229.3 fb-1 ... along planned path towards ever higher luminosity ... – PowerPoint PPT presentation

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Title: Physics at BABAR and Future Plans


1
Physics at BABAR and Future Plans
  • David B. MacFarlane
  • for the BABAR Collaboration
  • SLUO Annual Meeting

2
BABAR Collaboration
Gathering at SLAC, July 2002
10 Countries 77 Institutions 593 Physicists May
2004
3
B Factory Motivation 1987
  • Discovering origins of CP violation

4
CP Violation in the B System
  • CPV through interference of decay amplitudes

5
CP Violation in the B System
  • CPV through interference of decay amplitudes
  • CPV through interference of mixing diagram
  • CPV through interference between mixing and decay
    amplitudes

Directly related to CKM angles for single decay
amplitude
6
CKM Unitarity
Product of 1st and 3rd columns (1 of 6 relations)
7
Time-Dependent Asymmetry Measurements
Exclusive B Meson Reconstruction
Y(4S) produces coherent B pair t Dt
B-Flavor Tagging
8
Ongoing BABAR Physics Program
  • Comprehensively explore CP-violating asymmetries
    in B meson decays. Test the SM and search for
    CP-violating amplitudes from processes beyond the
    SM.
  • Systematically map out rare B decay processes,
    including all those with sensitivity to new
    physics.
  • Extract the magnitudes of CKM elements and other
    well-defined SM parameters.
  • New physics processes exist in context of SM
    physics
  • Requires detailed studies to elucidate the
    dynamics of processes and states involving heavy
    quarks.
  • Perform studies over a broad range of physics,
    such as t-lepton physics, QED studies,
    strong-interaction physics utilizing ISR
    processes, etc.

9
Ongoing BABAR Physics Program
  • Comprehensively explore CP-violating asymmetries
    in B meson decays. Test the SM and search for
    CP-violating amplitudes from processes beyond the
    SM.
  • Systematically map out rare B decay processes,
    including all those with sensitivity to new
    physics.
  • Extract the magnitudes of CKM elements and other
    well-defined SM parameters.
  • New physics processes exist in context of SM
    physics
  • Requires detailed studies to elucidate the
    dynamics of processes and states involving heavy
    quarks.
  • Perform studies over a broad range of physics,
    such as t-lepton physics, QED studies,
    strong-interaction physics utilizing ISR
    processes, etc.

Comprehensive Program
10
PEP-II Integrated Luminosity
PEP-II Records
Peak luminosity
9.21x1033 cm-2 s-1
Best shift
246.3 pb-1
Best day
710.5 pb-1
Best 7 days
4.291 fb-1
Best week
4.200 fb-1
Best month
16.02 fb-1
Best 30 days
16.05 fb-1
BABAR logged
229.3 fb-1
(as of July 4, 2004)
11
BABAR Running Well
Production Month
Double Trickle
12
PEP II Luminosity Projections
13
BABAR Publications
BABAR
Belle
lt2003
34
54
2003
47
28
2004 (July 1)
18
13
Total
99
95
Labeled according to internal circulation date
Expect 100th BABAR physics paper to be submitted
this week
14
a
g
b
Revealing SM Physics 2004
15
BABAR Result for sin2b
hCP -1
hCP 1
sin2b 0.723 ? 0.158
Summer 02
16
Standard Model Constraints
Indirect constraints vs direct measurement
At 95 CL
A.Hoecker et al.
17
a
g
b
18
Asymmetries for Penguins
19
BABAR Results for
BABAR 110 fb-1
Signal
Submitted to PRL
Summer 03
20
BABAR Results for
BABAR 110 fb-1
Total Continuum All bgk.
Total Continuum All bgk.
New Winter 04
21
Intriguing Hint?
If central value remains as is, this would become
5 sigma by 2005
22
Asymmetries for Penguins
Internal Penguin
23
a
g
b
24
Competing Amplitudes for B ? hh-
Internal Penguin
Tree-level bu
CKM suppressed
CKM suppressed
25
Observation of
BABAR 113 fb-1
signal
qq bkgd
rp0
Fischer discriminant
Signal BF x 10-6 s
Large!
Summer 03
26
Projections of Isospin Analysis
27
New Result on
Small!
BABAR 113 fb-1
  • Isospin analysis interference, NR contributions,
    I1 amplitudes neglected

New Winter 04
28
Analysis from CKMFitter Group
(no pp,rr)
Other ingredients in rr isospin analysis
29
a
g
b
30
Method for
Gronau-London-Wyler, 1991
Color-suppressed tree
Color-allowed tree
31
a
g
b
32
Decays to Common Final States
33
a
g
b
34
Fully Reconstructed B Sample
Old idea with new level of sensitivity
Reconstruct B mesons in 1000 modes
S/B0.3
Efficiency 0.4 or 4000 B mesons/fb-1 (charged
and neutral)
Require lepton p gt 1GeV/c
S/B2.5
35
Study of b u Enriched Sample
6.9
6.0
8.8
36
HQE Fit Results for Combined Moments
? used, ? unused in the nominal fit
mX moments
BABAR
El moments
Red line HQE fit Yellow band theory errors
c 2/ndf 20/15
37
Measurement Improvements
  • New BABAR result compares well with previous
    measurements
  • Vcb is now measured to 2

38
Perspective 2006
Ready for next steps in precision SM physics
39
Perspective 2006
  • A Change of Paradigm?

40
Opportunities for Super B Factory
  • Current program of PEP-II/BABAR and KEKB/Belle
    could attain 1-2 ab-1 by end of the decade
  • Data samples will be almost 10x larger than now
    and 50-200x times larger than CLEO
  • With such a large increase in sensitivity to rare
    decays, expect that there is a significant
    discovery potential
  • Rich program of flavor physics/CP violation to be
    pursued
  • Even larger samples may offer opportunity to
    search for new physics in CP violation and rare
    decays
  • High-luminosity asymmetric ee- colliders with
    luminosities 1035-1036 cm-2s-1 and up to 10
    ab-1/year Super B Factory
  • Emphasis on discovery potential and
    complementarity in an era when LHC is operating,
    along with LHCb and BTeV (?)
  • Complementary flavor physics if LHC discovers
    SUSY, etc discovery window if no new physics
    seen?

41
Roadmap Process within BABAR
  • Defining of physics case for Super B Factory
  • Emphasize sensitivity to new physics in CP
    violation rare decays
  • Emphasize need capability for precision SM
    measurements
  • Requirements of viable project plans
  • Peer review, approval and funding process
  • Collider options and upgrade capabilities
  • Detector capabilities requirements in light of
    projected backgrounds
  • Integrated scenarios for collider and detector
    construction, with implications for time to first
    data
  • Projections of physics reach in light of
    competition other opportunities
  • Projections of samples and sensitivities
    analysis of physics reach

42
Parameters for High-Luminosity B Factory
Luminosity 2-3x1034 1.5x1035 2.5x1035 7x1035 Units
e 3.1 3.1 3.5 8.0 GeV
e- 9.0 9.0 8.0 3.5 GeV
I 4.5 8.7 11.0 6.8 A
I- 2.0 3.0 4.8 15.5 A
b(y) 7 3.6 3.0 1.5 mm
b(x) 30 30 25 15 cm
Bunch length 7.5 4 3.4 1.7 mm
bunches 1700 1700 3450 6900
Crossing angle 0 0 11 15 mrad
Tune shifts (x/y) 8/8 11/11 11/11 11/11 x100
rf frequency 476 476 476 952 MHz
Site power 40 75 85 100 MW
LER vacuum
HER vacuum, IR
952 MHz rf
J.Seeman
43
Upgrade Plan Initial 5x1035 Project
LER replacement
HER replacement
952 MHz rf
SVT striplets
Silicon outer tracker
Rad Hard EMC
DRC replacement
5.0
7.0 x 1035
2.5
44
Upgrade Plan Ultimate Reach
LER replacement
HER replacement
952 MHz rf
SVT striplets
Thin pixels
Silicon outer tracker
Rad Hard EMC
DRC replacement
5.0
7.0 x 1035
2.5
45
Possible Timeline for Super B Program
Construction of upgrades to L 5-7x1035
Super B Operation
Super-B Program
RD, Design, Proposals and Approvals
2001
2003
2010
2008
2006
2005
2012
2011
Construction
Installation
LOI
CDR
Commission
P5
Planned PEP-II Program
(June 30, 2003)
(End 2006)
(PEP-II ultimate)
46
Searching for New Physics
PEP-II, KEKB
Super B-Factory 10/2011
5x1035 rising to 7x1035
f0KS KSp0 jKS hKS KKKS
Error on sine amplitude
Discovery region if non-SM physics is 20 effect
47
Conclusions
  • BABAR and PEP-II continuing along planned path
    towards ever higher luminosity
  • Accumulating data with high efficiency,
    exploiting great strides by PEP-II addressing
    known detector computing issues
  • Expect to accumulate 0.5 ab-1 in calendar 2006,
    representing a doubling of current data sample
  • Strong physics case for doubling the data sample
    again by end of decade, achieving 1-2 ab-1
  • BABAR has accumulated one of the great data
    samples in particle physics
  • Physics is being vigorously exploited, both
    across a broad range of important problems, and
    broadly within the Collaboration
  • Expect many new and updated results at ICHEP04,
    including results that use our full data sample
    from Run 4

48
Conclusions
  • Have made good progress as a physics community in
    defining a longer-term roadmap
  • Builds on ideas of Super B Factories from
    Snowmass 2001 and subsequent workshops
  • Builds on proven track record of high-luminosity
    storage rings and general purpose ee- detectors
  • Builds on our present knowledge of CP violation
    and rare B decays expect that case will only
    strengthen as we achieve planned luminosity
    improvements over the next few years
  • Outlines now exist of the detector and collider
    requirements and goals for a major upgrade to
    existing facilities
  • Next Steps RD, conceptual design development,
    sharpening physics arguments
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