BABAR Physics Results and Future Plans
David B. MacFarlaneSLUO Annual MeetingSeptember 26, 2005
Sep 26, 2005 BABAR Physics Results and Future Plans 2
INFN, Perugia & UnivINFN, Roma & Univ "La Sapienza"INFN, Torino & UnivINFN, Trieste & Univ
The Netherlands [1/4]NIKHEF, Amsterdam
Norway [1/3]U of Bergen
Russia [1/13]Budker Institute, Novosibirsk
Spain [2/3]IFAE-BarcelonaIFIC-Valencia
United Kingdom [11/75]U of BirminghamU of BristolBrunel UU of EdinburghU of LiverpoolImperial CollegeQueen Mary , U of LondonU of London, Royal Holloway U of ManchesterRutherford Appleton LaboratoryU of Warwick
USA[38/311]
California Institute of Technology
UC, IrvineUC, Los AngelesUC, RiversideUC, San DiegoUC, Santa BarbaraUC, Santa CruzU of CincinnatiU of ColoradoColorado StateHarvard UU of IowaIowa State ULBNLLLNLU of LouisvilleU of MarylandU of Massachusetts, AmherstMITU of MississippiMount Holyoke CollegeSUNY, AlbanyU of Notre DameOhio State UU of OregonU of PennsylvaniaPrairie View A&M UPrinceton USLACU of South Carolina
Stanford UU of TennesseeU of Texas at AustinU of Texas at DallasVanderbiltU of WisconsinYale
Canada [4/24]U of British ColumbiaMcGill UU de MontréalU of Victoria
China [1/5]Inst. of High Energy Physics,
Beijing
France [5/53]LAPP, AnnecyLAL Orsay
The BABAR Collaboration
11 Countries 80 Institutions623 Physicists
LPNHE des Universités Paris VI et VII
Ecole Polytechnique, Laboratoire Leprince-Ringuet
CEA, DAPNIA, CE-Saclay
Germany [5/24]Ruhr U BochumU DortmundTechnische U DresdenU HeidelbergU Rostock
Italy[12/99]
INFN, BariINFN, FerraraLab. Nazionali di Frascati dell'
INFNINFN, Genova & UnivINFN, Milano & UnivINFN, Napoli & UnivINFN, Padova & UnivINFN, Pisa & Univ & Scuola
Normale Superiore
Sep 26, 2005 BABAR Physics Results and Future Plans 3
BABAR Detector
DIRC PID)144 quartz
bars11000 PMs
1.5T solenoid
EMC6580 CsI(Tl) crystals
Drift Chamber40 layers
Instrumented Flux Return
iron / RPCs or LSTs (muon / neutral hadrons)
Silicon Vertex Tracker
5 layers, double sided strips
e
(3.1GeV)
e (9GeV)
Collaboration founded in 1993Detector commissioned in 1999
Sep 26, 2005 BABAR Physics Results and Future Plans 4
Integrated data sample to date
New milestoneat 300 fb-1 delivered
Sep 26, 2005 BABAR Physics Results and Future Plans 5
PEP-II Monthly Delivery
Run 4 Run 5
Safety stand-down
Sep 26, 2005 BABAR Physics Results and Future Plans 6
PEP-II Daily Average Delivery
Run 4 Run 5
Safety stand-down
Sep 26, 2005 BABAR Physics Results and Future Plans 7
Performance: Run 4
Actual
Prediction July 2003
Sep 26, 2005 BABAR Physics Results and Future Plans 8
Performance: Run 5
BABAR Running
56%
PEP MD3%
Tuning18%
Unsched down21%
Sched down2%
Power outage BPM
loss
Actual
Prediction Apr 2005
Sep 26, 2005 BABAR Physics Results and Future Plans 9
Projected data sample
Goal is 1.2x1034 by next spring
o 3300 mA LER on 1700 mA HER
4 month down in 2006 for IR vacuum, rf, and feedback system work
o Goal is to improve peak luminosity to 2x1034 by 2008
Delivered Luminosity Comparison
0
200
400
600
800
1000
1200
1400
Oct
-04
Fe
b-0
5
Jun
-05
Oct
-05
Fe
b-0
6
Jun
-06
Oct
-06
Fe
b-0
7
Jun
-07
Oct
-07
Fe
b-0
8
Jun
-08
Belle
BABAR
2006: Double data to 450 fb-1
2008: Double again to 1000 fb-1
LST installation
Sep 26, 2005 BABAR Physics Results and Future Plans 10
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 environmento Sensitivity to New Physics at LHC mass scales
through rare decays and CP violationo Discovery potential from large data sample across
a whole range of beauty, charm, tau, two-photon, ISR physics
o Full program of flavor physics/CP violation measurements will provide a legacy of fundamental constraints on future New Physics discoveries
Challenging measurements at the edge of sensitivity benefit enormously from operation of both PEP-II &
KEK B Factories
Sep 26, 2005 BABAR Physics Results and Future Plans 11
Weak Interaction in Standard Model
Apex at
,
0 0B - B mixing
) B and ( b c
( ) b u
0,1 0,0
1
2
3
Unitarity Triangle as a summary of Standard Model
b physics
us ubud
cs cbcd
ts tbtd
V V VV V V V
V V V
+ phases
Radiative penguin decays
CP violation
* * *Unitarity: 0ub cb tbud cd tdV V V V V V
Sep 26, 2005 BABAR Physics Results and Future Plans 12
CP violation in B decays
2
wk sti iA e e
1AB f CPV through
interference of decay amplitudes
stwk
( ) ( )f or 0 and 0
B f B f
2
1 2( ) wk sti iB f A A e e
st
B f
1A
2A
wkB fwk
2
1 2( ) wk sti iB f A A e e
Sep 26, 2005 BABAR Physics Results and Future Plans 13
0 0/ SCPV in B J K
Interference of b c tree decay with mixing
CPV in charmonium modes
0- 0B Bmixing ( )b u
,
)B and ( b c 0,1 0,0
1
2
3
0Bb
db
d t
tWW 0B
0Bc
b
d
W/J
d
c
s 0K
Sep 26, 2005 BABAR Physics Results and Future Plans 14
Sep 26, 2005 BABAR Physics Results and Future Plans 15
0 0/ SB J K
/J
0SK
Sep 26, 2005 BABAR Physics Results and Future Plans 16
Recoil B
Flavor tag:
eb ce
+ vertex separation = time
difference
Sep 26, 2005 BABAR Physics Results and Future Plans 17
sin2 results from charmonium modes
BABAR PUB-04/038Update for ICHEP04
sin2 0 722 0.040 0.023/ 0.950 0.031 0.013
.A A
0( ) ( odd) modesScc K CP
1205 on peak or 227 pairs7730 CP events (tagged signal)
f b M BB
BBAABBARARBBAABBARAR
0
0
( ) +( )
S
L
cc Kcc K
0( ) ( even) modesLcc K CP
BBAABBARARBBAABBARAR
0( / ) 0.652 0.039 0.020S J K
Belle update for LP05
386 pairsM BB
0 0/ + / onlyS LJ K J K
Sep 26, 2005 BABAR Physics Results and Future Plans 18
BABAR & Belle physics results
Journal Papers BABAR Belle
<2003 32 54
2003 39 28
2004 52 35
Sept 2005 51 32
Total 174 149
Conference Contributions
BABAR Belle
Papers submitted to ICHEP04
72 63
Abstracts submitted to LP05
75 73
Sep 26, 2005 BABAR Physics Results and Future Plans 19
Observation of Y(4260)J/+- in ISR
o Signal 123±23 events; >8σ statistical significance
o Mass (4258±8) MeV; just above DSDS threshold
o Total width (88±23) MeV
0.80.7( ) ( ) (5.5 1.0 )eVY e e B Y J
(2S)
hep-ex/0506081
LP05
232 fb-1
Joins growing list of not
understood heavy mass
states
Sep 26, 2005 BABAR Physics Results and Future Plans 20
0 , , ,
CPV in B
Interference of suppressed b u tree decay with
mixing
CPV in charmless modes
0- 0B Bmixing
( )b u
,
)B and ( b c 0,1 0,0
1
2
3
0Bb
db
d t
tWW 0B
0Bub
d
W
d
u
d
3rd component:
sizable Penguin diagram
0Bu
b
d
W
d
ud
g, ,u c t
Sep 26, 2005 BABAR Physics Results and Future Plans 21
New approach from BABAR: B Extraction of similar to , but with advantage of smaller Penguin pollution:
00 00
0
| | | |, f ound small: small
| | | | peng
A AA A
Potentially could be mixed , but is f ound to be almost pure 1
CPCP
0.080 33 0.24 0.140 03 0.18 0 09
long
long
S .
C . .
Moriond EW05
0 (232 pairs) B M BB 0 (232 pairs) B M BB
Signal: 617 52 events0.0210.978 0.014 0.029longf
BBAABBARARBBAABBARAR
BABAR PUB-05/007
0 11 90% eff CL
BABAR PUB-04/048
Sep 26, 2005 BABAR Physics Results and Future Plans 22
Summary of constraints on
Mirror solutions
disfavored
o
From combined , , results:
10103 9
o indirect constraint
13fi t: 98 19
CKM
BABAR onlyBABAR onlyBABAR onlyBABAR only
Object lesson: with data in hand, clever analysis ideas will
emerge
Sep 26, 2005 BABAR Physics Results and Future Plans 23
Unexpectedly good progress on gamma!
0 , ,CP DCS: CPV in B D K D K
Interference of color-allowed and color-suppressed tree
decays
0- 0B Bmixing
( )b u
,
)B and ( b c 0,1 0,0
1
2
3
Bcb
u
W
(*)0Du
u
s(*)K
B
cb
u
W(*)0D
u
u
s (*)K
Effect depends on ratio of two diagrams
Sep 26, 2005 BABAR Physics Results and Future Plans 24
Dalitz plot analysis for gammaIdea: Increase B decay interference through D decay Dalitz plot
(*)0 0 SB D K K
Object lesson: with data in hand, clever analysis ideas will
emerge
o I ndirect constraint:
757 13
o
From combined analysis:
2351 18
Sep 26, 2005 BABAR Physics Results and Future Plans 25
UT from sin2 & indirect constraints
Paradigm change!
Now: looking for New Physics as
correction to CKM
Sep 26, 2005 BABAR Physics Results and Future Plans 26
UT from CP violation measurements alone
New B Factory milestone:
Comparable UT precision from CPV
alone
Sep 26, 2005 BABAR Physics Results and Future Plans 27
0 0 0 , , S SCPV in B K K
Interference of suppressed b s Penguin decay with
mixing
CPV in Penguin Modes
0- 0B Bmixing ( )b u
,
)B and ( b c 0,1 0,0
1
2
3
0Bb
db
d t
tWW 0B
0Bs
b
d
W
0Kd
ss
g, ,u c t
Sep 26, 2005 BABAR Physics Results and Future Plans 28
Potential New Physics contributions
0B
b ss
sd
d
W
g
, ,u c t
“Internal Penguin”
0SK
0B
0SK
0 0 B K
0 0 B K
0SK
0B
b
s
s
sd d
0SK
0B
b
s
s
sd d
SUSY contribution with new phases
New physics in loops?
Sep 26, 2005 BABAR Physics Results and Future Plans 29
CPV in charmonium & s-penguin modes
No sign of Direct CP
3.7 between CP violation in s-
penguin vs sin2 (cc)
Charmonium
s-Penguins
Good consistency between B Factory
experiments
Winter 05 results
Sep 26, 2005 BABAR Physics Results and Future Plans 30
How good are Standard Model predictions?
Present SM
uncertainty
Beneke, CKM05
Sep 26, 2005 BABAR Physics Results and Future Plans 31
New three-body mode: B KSKSKS
88±10 signal events
3
3
0.380 71 0.040.320.280.34 0.050.25
S
S
KCP
K
S .
C
BABAR PUB-04/052
4S
0B0
B
0SK
0
SKee
tagB
yx
Beam constrain
t
Aspen05
Sep 26, 2005 BABAR Physics Results and Future Plans 32
After summer 2005 updates
: 237 million pairsBelle: 386 million pairs
BABAR BBBB
No sign of Direct CP
2.4 between CP violation in s-
penguin vs sin2 (cc)
Summer 05 results
About 0.5 loss from shift in charmonium
average
Charmonium
s-Penguins
Sep 26, 2005 BABAR Physics Results and Future Plans 33
0.00
0.05
0.10
0.15
0.20
0.25
0.30
0.35
0.40Ja
n-03
Jul-
03
Jan-
04
Jul-
04
Jan-
05
Jul-
05
Jan-
06
Jul-
06
Jan-
07
Jul-
07
Jan-
08
Jul-
08
Jan-
09
Jul-
09
Err
or
on
sin
e am
pli
tud
eSnapshot: Summer 2008
K*
5 discovery region if non-SM physics is 0.30 effect
2004=240 fb-1
2006=450 fb-1
2008=1 ab-1
Golden modes reach 5
sigma level
Projections are statistical errors only; but systematic errors at few percent
level
Luminosity expectation
s:
20082004
( ) 0.30S f0KS
KS0
KS
’KS
KKKS
Sep 26, 2005 BABAR Physics Results and Future Plans 34
Global CKM fit: 2008
( ) 6.5% ubV ( ) 5%sm (sin 2 ) 0.019 o( ) 6 o( ) 10
95% contours
Sep 26, 2005 BABAR Physics Results and Future Plans 35
now 2008
UT constraints in 2008
Assumption: no NP in trees [almost any NP model]
68% contours
Significant constraint on all New Physics models in LHC era
( ) 8% ubV ( ) 6.5% ubV
Sep 26, 2005 BABAR Physics Results and Future Plans 36
Bounds on new physics
now
2008
Model independent
If translated in terms of probed new
physics mass scale
(now) ~ 5 TeV(2008) ~
10TeV
0/ sin2
d d d
d
SM
B B B
S BCP
M C M
A J K
Introduce new physics in mixing
diagram
Sep 26, 2005 BABAR Physics Results and Future Plans 37
Summary: Physics plans for BABAR Goal for 2005-2006: double current data set
o 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
o Error on average of Penguin modes should reach 0.06 Goal for 2007-2008: double again to ~1 ab-1
o Individual Penguin modes with errors in range 0.06-0.12o 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
o Sensitivity to New Physics through rare decays, CP violation, & large data sample with a significant discovery potential
o Full program of flavor physics/CP violation measurements provide fundamental constraints on future New Physics discoveries
Backup
Sep 26, 2005 BABAR Physics Results and Future Plans 39
DCH electronics upgrade Motivation:
o Reduce deadtime due to serialization and shipping of data from DIOM to ROM
Upgrade in two steps:o Phase 1 (summer 2004)
• Ship only 1/2 waveform information (3216 bytes) from frontends
• No change observed with datao Phase 2 (Oct 2005)
• Larger FPGA for feature extraction before transmission hardware change
• New boards in production
Sep 26, 2005 BABAR Physics Results and Future Plans 40
IFR upgrade with LSTs
Bottom & top sextants installed summer 2004Remaining sextants wait until summer 2006
Sep 26, 2005 BABAR Physics Results and Future Plans 41
LSTs are fully operational
New LST sextantsEfficiency
curves from Run 5 data
Old RPC sextants
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