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BABAR Status & Plans. David B. MacFarlane SLAC EPAC Meeting January 25, 2006. Pillars of BABAR physics program. Highly constrained and redundant set of precision tests of weak interactions in the Standard Model

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Babar status plans

BABAR Status & Plans

David B. MacFarlane

SLAC EPAC Meeting

January 25, 2006


Pillars of babar physics program
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

BABAR Status and Plans


The BABAR Collaboration

11 Countries

80 Institutions

623 Physicists

BABAR Status and Plans


Babar belle physics results
BABAR & Belle physics results

BABAR Status and Plans


Integrated data sample to date

96% efficiency over the entire history of BABAR

BABAR, Run 5

Integrated data sample to date

BABAR Status and Plans


Pep ii overall parameters and goals

More than 3x design

More than 5x design

PEP-II overall parameters and goals

BABAR Status and Plans


Pep ii overall parameters and goals1

40%

30%

10%

Factor 2!

PEP-II overall parameters and goals

BABAR Status and Plans


Projected data sample growth

Double again from 2006 to 2008

ICHEP08

  • PEP-II: IR-2 vacuum, 2xrf stations, BPM work, feedback systems

  • BABAR: LST installation

Double from 2004 to 2006

ICHEP06

4-month down for LCLS, PEP-II & BABAR

Projected data sample growth

20

Integrated Luminosity [fb-1]

17

12

Lpeak = 9x1033

BABAR Status and Plans


Ifr upgrade with lsts
IFR upgrade with LSTs

Bottom & top sextants installed summer 2004

Remaining sextants delayed until fall 2006

BABAR Status and Plans


Weak interaction in standard model

+ phases

Weak Interaction in Standard Model

Unitarity Triangle as a summary of Standard Model b physics

BABAR Status and Plans


Classic indirect constraints
Classic indirect constraints

2008: ~5%

BABAR Status and Plans


Weak interaction in standard model1

+ phases

CP violation

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

BABAR Status and Plans


Cpv in charmonium modes
CPV in charmonium modes

Interference of b®c tree decay with mixing

BABAR Status and Plans


Cpv in charmless modes

3rd component: sizable Penguin diagram

CPV in charmless modes

Interference of suppressed

b®u tree decay with mixing

BABAR Status and Plans


Remarkably good progress on gamma

Effect depends on ratio of two diagrams

Suppressed

Remarkably good progress on gamma!

Interference of color-allowed and color-suppressed tree decays

BABAR Status and Plans


Direct cp violation measurements
Direct CP violation measurements

2008: ~2%

2008: 10o

2008: 5-10o

BABAR Status and Plans


Ut from sin2 b indirect constraints
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!

BABAR Status and Plans


Ut from cp violation measurements alone
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

BABAR Status and Plans


Cpv in penguin modes
CPV in Penguin Modes

Another implication of overconstrained: redundant approaches to same CKM parameter

Interference of suppressed

b®s Penguin decay with mixing

BABAR Status and Plans


Potential new physics contributions

New physics in loops?

SUSY contribution with new phases

Potential New Physics contributions

“Internal Penguin”

BABAR Status and Plans


Revealing new physics
Revealing new physics

B Factory

LHC

Squark mass matrix (d sector)

BABAR Status and Plans


Summary after summer 2005 updates
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

BABAR Status and Plans


Babar ckm physics goals
BABAR CKM physics goals

BABAR Status and Plans


Global ckm fit 2008

95% contours

Global CKM fit: 2008

BABAR Status and Plans


Projections to summer 2008
Projections to summer 2008

Luminosity expectations:

2004=240 fb-1

2008=1.0 ab-1

K*g

f0KS

KSp0

jKS

h’KS

KKKS

5s discovery region if non-SM

physics is 0.30 effect

2004

2008

Golden modes reach 5 sigma level

Projections are statistical errors only;

but systematic errors at few percent level

BABAR Status and Plans


Ut constraints in 2008

2008

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

BABAR Status and Plans


Bounds on new physics in b d mixing

now

2008

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

BABAR Status and Plans


Babar rare decay physics goals
BABAR rare decay physics goals

BABAR Status and Plans


New ckm constraints in sight

W,H

New CKM constraints in sight

2008: Possible discovery

Possible discovery: 2007

BABAR Status and Plans


Complementarity with lhc
Complementarity with LHC

2008

today

Approx…

2HDM

Constraints from B® tn, B® sg

BABAR Status and Plans


Babar physics goals
BABAR Physics Goals

BABAR Status and Plans


Lepton flavor violation msugra

tanb = 55

Inverted hierarchy

s-t is LSP

allowed

Br(teg) < 1x10-8

2x10-8

5x10-8

11x10-8

2008 limit

Current BABAR limit

Lepton-flavor violation & mSUGRA

BABAR Status and Plans


Summary physics plans for babar
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

BABAR Status and Plans



A day in the life of a b factory
A day in the life of a B Factory

BABAR Status and Plans


Pep ii performance peak luminosity
PEP-II performance: peak luminosity

BABAR Status and Plans


Babar detector

Upgrades

Upgrades

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

BABAR Status and Plans


Dch electronics upgrade
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

BABAR Status and Plans



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