BABAR Physics Results and Future Plans David B. MacFarlane SLUO Annual Meeting September 26, 2005

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


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


Integrated data sample to date

New milestoneat 300 fb-1 delivered


PEP-II Monthly Delivery

Run 4 Run 5

Safety stand-down


PEP-II Daily Average Delivery

Run 4 Run 5

Safety stand-down


Performance: Run 4

Actual

Prediction July 2003


Performance: Run 5

BABAR Running

56%

PEP MD3%

Tuning18%

Unsched down21%

Sched down2%

Power outage BPM

loss

Actual

Prediction Apr 2005


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


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


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


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


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



0 0/ SB J K

/J

0SK


Recoil B

Flavor tag:

eb ce

+ vertex separation = time

difference


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


0( / ) 0.652 0.039 0.020S J K

Belle update for LP05

386 pairsM BB

0 0/ + / onlyS LJ K J K


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


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


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


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


BABAR PUB-05/007

0 11 90% eff CL

BABAR PUB-04/048


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


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


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


UT from sin2 & indirect constraints

Paradigm change!

Now: looking for New Physics as

correction to CKM


UT from CP violation measurements alone

New B Factory milestone:

Comparable UT precision from CPV

alone


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


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?


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


How good are Standard Model predictions?

Present SM

uncertainty

Beneke, CKM05


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


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


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


Global CKM fit: 2008

( ) 6.5% ubV ( ) 5%sm (sin 2 ) 0.019 o( ) 6 o( ) 10

95% contours


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


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


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


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


IFR upgrade with LSTs

Bottom & top sextants installed summer 2004Remaining sextants wait until summer 2006


LSTs are fully operational

New LST sextantsEfficiency

curves from Run 5 data

Old RPC sextants

Documents

BABAR Physics Results and Future Plans David B. MacFarlane SLUO Annual Meeting September 26, 2005