3/20/03 SLAC- B DayMarcello A. Giorgi1 BABAR Future Marcello A. Giorgi at SLAC B DAY.

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3/20/03 SLAC- B Day Marcello A. Giorgi 1 BABAR Future Marcello A. Giorgi at SLAC B DAY
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Transcript of 3/20/03 SLAC- B DayMarcello A. Giorgi1 BABAR Future Marcello A. Giorgi at SLAC B DAY.

3/20/03 SLAC- B Day Marcello A. Giorgi 1

BABAR FutureBABAR Future

Marcello A. Giorgi

at

SLAC B DAY

3/20/03 SLAC- B Day Marcello A. Giorgi 2

Outline

• BaBar Collaboration• BaBar Mission• Present Achievements• What Next.......

3/20/03 SLAC- B Day Marcello A. Giorgi 3

USA [38/285]California Institute of TechnologyUC, IrvineUC, Los AngelesUC, RiversideUC, San DiegoUC, Santa BarbaraUC, Santa CruzU of CincinnatiU of ColoradoColorado StateFlorida A&MHarvardU 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 CarolinaStanford UU of TennesseeU of Texas at AlbanyU of Texas at DallasVanderbiltU of WisconsinYale

Canada [4/18]U of British ColumbiaMcGill UU de MontréalU of Victoria

China [1/5]Inst. of High Energy Physics, Beijing

France [5/52]LAPP, AnnecyLAL OrsayLPNHE des Universités Paris VI et VIIEcole Polytechnique, Laboratoire Leprince-RinguetCEA, DAPNIA, CE-Saclay

Germany [3/28]Ruhr U BochumTechnische U DresdenU Rostock

January 14, 2003

Italy [11/101]INFN, Bari&UINFN, Ferrara&ULab. Nazionali di Frascati dell' INFNINFN, Genova&UINFN, Milano&UINFN, Napoli&UINFN, Padova&UINFN, Pisa&U&ScuolaNormaleSuperioreINFN, Roma &U "La Sapienza"INFN, Torino&UINFN, Trieste&U

The Netherlands [1/2]NIKHEF, Amsterdam

Norway [1/3]U of Bergen

Russia [1/9]Budker Institute, Novosibirsk

United Kingdom [10/66]U of BirminghamU of BristolBrunel UU of EdinburghU of LiverpoolImperial CollegeQueen Mary , U of LondonU of London, Royal Holloway U of ManchesterRutherford Appleton Laboratory

The The BBAABBARAR CollaborationCollaboration

10 Countries 75 Institutions 569 Physicists

3/20/03 SLAC- B Day Marcello A. Giorgi 4

3/20/03 SLAC- B Day Marcello A. Giorgi 5

LUMINOSITY After a long run period July 1,2002 Babar & PEPII RUN 2

stopped. RUN 3 has started Nov.18,2002 and after the short winter shutdow (dec 23-jan 2) operation is continuing in 2003

RUN 1 & RUN 2 PEP has delivered 98.5 fb-1 BABAR recorded 83.9 fb-1 (on peak) 9.9 fb-1 (off peak)

RUN 3 PEP has delivered 16.12 fb-1

BABAR recorded 15.49 fb-1 (on peak) 1.16 fb-1 (off peak)

B pair collected (Runs 1+2+3) 112 Million

3/20/03 SLAC- B Day Marcello A. Giorgi 6

Jun 29

At the end of the present Run 3 (June 29) we expect more than 40 fb-1

3/20/03 SLAC- B Day Marcello A. Giorgi 7

BaBar Physics MissionNew environment: high luminosity asymmetric

collider1)Search for CP violation in B mesons decays largely predicted

by the Standard Model2)Test extensively at this low energy scale the Standard Model

by measuring precisely enough quantities to impose constraints on the Standard Model parameters

CP in b sector is FOUND !

We move now toward the second part of our mission

Precision measuremets B physics, rare B decaysTRY to open windows on new Physics beyond Standard

Model

3/20/03 SLAC- B Day Marcello A. Giorgi 8

Flavour mixing and CP,T,CPT

22*

12

1211

22*12

1211

22

i

MM

MMiMH

Let us remind the Effective Hamiltonian to describe system, where the mass eigenstates BH and BL are:

0_

0 BB

_

00/ ||| BqBpB LH

and 1212

*12

*12

2

2

iM

iM

p

q21

12

Hq

Hp

=

ff

ff

BTfBTfBTf

BTfxTfBTf

20*00

0*0

20

|||||||

||||||||

3/20/03 SLAC- B Day Marcello A. Giorgi 9

Flavour mixing and CP,T,CPT

m=mH-m L 2|M12| 0.5ps-

1

1/ 1.6 ps

=H-L |M12|Re (12/M12)

SM

1p

q CP and T Violation in mixing

42

2

105sin41 t

c

m

m

p

q

As in K sector where k=(p-q)/(p+q) ~O(10-3)

SM

3/20/03 SLAC- B Day Marcello A. Giorgi 10

Flavour mixing and CP,T,CPTCP an CPT conservation if H11=H22

2

22

im

iMz

2

2211 MMM

2

2211

t)),BB((Probt)),BB((Prob_

0_

000 0z

CP and CPT VIOLATION

3/20/03 SLAC- B Day Marcello A. Giorgi 11

Flavour mixing and CP,T,CPT

Time dependence:dN exp(–|t|/B) ( 1 ± D (S sin(mt) - Ccos(mt)) ) R

2

2

21

1

1

Im2

CS

CPV in Mixing DecayCPV direct

cp

cp

cp A

A

p

q___

D is the mis-tag dilution

R is the time resolution

0B

0B

CPfCP

mix

ing dec

ay

CPfA

CPfA

t

3/20/03 SLAC- B Day Marcello A. Giorgi 12

CP in the Standard Model

)(O

1A)i1(A

A21

1

)i(A21

1

VVV

VVV

VVV

V 4

23

22

32

tbtstd

cbcscd

ubusud

CP is explained in S.M. by the presence of a phase among the 4 parameters of the flavour mixing matrix CKM

In the above parametrization ,where is sin c , is the parameter contributing to

CP

3/20/03 SLAC- B Day Marcello A. Giorgi 13

O(2)

Representing unitarity relations as

Unitarity Triangles The unitarity condition of CKM matrix V V+=V+V=1 gives several relations between the matrix elements as

VudV*ub + VcdV*cb + VtdV*tb =0

(in this relation the 3 terms have the

same order of magnitude ~O(3) and it can be graphically represented as a triangle in a complex plane with sides of comparable length. Other relations have terms of different order of magnitudes.Ex:

VusV*ub + VcsV*cb + VtsV*tb =0

O(4) O(2)

Overconstrain and the 4 parameters of CKM , A

3/20/03 SLAC- B Day Marcello A. Giorgi 14

cp

cp

sin2 = 0.755 0.074 sin2 = 0.723 0.158

PRL 89 (2002) 201802

Measurement of sin2=0.741 0.067 0.034

3/20/03 SLAC- B Day Marcello A. Giorgi 15

Osaka -2002Rome- 2001

Amsterdam- 2002

CP discovery

in B sector

3/20/03 SLAC- B Day Marcello A. Giorgi 16

CP,T,CPT

A simultaneous fit to tagged and untagged data gives :m ,sin2 (consistent with previous analysis)|Acp/ Acp | (consistent with no direct CP violation (4.5%)

90% CL

3/20/03 SLAC- B Day Marcello A. Giorgi 17

CP,T,CPT

From dileptons

3/20/03 SLAC- B Day Marcello A. Giorgi 18

What next for Sin 2

We can improve the expt. error on sin2 with luminosity in time dependent asimmetry for channels as: bccs O(2) (golden as J/Ks) or

bccd O(3) (as D (*)

+ D(*)-) ,

where the leading term gives sin2

0.5 ab-1

0.5 ab-1

3/20/03 SLAC- B Day Marcello A. Giorgi 19

What next on sin2Measure sin2 also in K (bsss pure penguin)

B

K(*)

K± Ks

80 Million B pairs

3/20/03 SLAC- B Day Marcello A. Giorgi 20

Time dependent analysisResults:

Assuming C=0 (no direct CPV)

S=sin2=-0.26±0.51 stat.

On control sample Charged K

expected S=0 Found S=0.26 ±0.27 stat.

3/20/03 SLAC- B Day Marcello A. Giorgi 21

BaBar (Br/10-6):

B04.7±0.6 ± 0.2 B 5.5 ± 1.0 ± 0.6 B <3.6

Towards sin2eff : S and C

0.02 0.34( ) 0.05( )

0.30 0.25( ) 0.04( )

S stat syst

C stat syst

B→

2 1 /

1 /

2effsin(

sin(

)1 2

)

i i

i i

P T e e

P T e e

ie

C

C

S

3/20/03 SLAC- B Day Marcello A. Giorgi 22

from 2

’’

0.050.340.2)2-sin(22sin eff

In a full isospin analysis one can measure and ’ from B and B decays with a 4-fold ambiguity

)Br()Br(2

)Br()Br()Br(cos

0

00210

Fix :BR() = 4.7x10-6, BR( ) = 4.1x10-

6

and assuming BR(x10-6

L = 0.5 ab-1L = 2.0 ab-1

fb-1

3/20/03 SLAC- B Day Marcello A. Giorgi 23

signal BR = 0.5e-6

best case: |eff – | < 190

with 10 fb-1

At present BR(B0→00) < 3.610-6 (81 /fb) |eff-| < 51o

0

0002

B

Bsin

Br

BrGrossman-Quinn bound:

2

No significant gainwith luminosity

Best case with this method

’’

sin2eff = 0.020.340.05with 2eff = 2

Bound on

3/20/03 SLAC- B Day Marcello A. Giorgi 24

Measuring with B+ D0 K

Take decay B± D01(D0

2)K ± where D01,2=(D0±D0)/2

B+ decay amplitudes can be written as:_

||____

0 ieAKDBA

ii eeAKDBA ||0

_

||__

0 ieAKDBA

ii eeAKDBA

||

__0

sin)sin(

_

0__

0

02,1

02,1

2,1

r

KDBKDB

KDBKDBA

sinsin221 rAAAcp and

__

Gronau,London and Wyler

3/20/03 SLAC- B Day Marcello A. Giorgi 25

Measuring with B+ D0 K+

)cos(2

1

)(

)( 2

0

11

rr

KDB

KDBn

)cos(2

1

)(

)( 2

0

22

rr

KDB

KDBn

)cos(2

1

)(

)( 2

0

22

rr

KDB

KDBp

)cos(2

1

)(

)( 2

0

11

rr

KDB

KDBp

02.029.002.1)(

)(

0

11

KDB

KDBn

)02.026.072.0()(

)(

0

11

KDB

KDBp

01.0100 1

Ldt

fbnnp iiii

actual detector: i=0.177“perfect” vertex detector: i=0.133 (no Bkg)N errors stat.

)1.0(

)(

)(

0

0

O

KDBA

KDBAr

3/20/03 SLAC- B Day Marcello A. Giorgi 26

New results with full statistics

To complete the measurements odd CP eigenstates are needed as Ks 0 and Cabibbo suppressed modes

3/20/03 SLAC- B Day Marcello A. Giorgi 27

from B+ D0 K+

sin2

input value(sin2

input value(sin2

0.5 ab-1

Fit: sin2

Toy MC: results for r=0.3

Fit with 2ab-1 (perfect):sin2sin2

3/20/03 SLAC- B Day Marcello A. Giorgi 28

Measuring Vub

Measure Br(bul) on the recoil of fully reconstructed B.

Close kinematics: P*l, Q2 and Mx available

Before lepton selection:

>3K events/fb-1, S/B=0.5After lepton selection:

~500 events/fb-1, S/B=1.3

Reco side

We are after thered part and one

want to go as close as the D mass

3/20/03 SLAC- B Day Marcello A. Giorgi 29

% error on Vub

0

0.05

0.1

0.15

0.2

0 2 4 6

Lumi(ab-1)

dV

ub

/Vu

b

% error on Vub

Current error

N.B. this estimate neglects the fact that the full fledged theorethical extraction becomes feasible only with enough statistics

Assuming a 5% theoretical error and a 5% experimental systematic error, here are the projections of the error as a function of the luminosity

The theoretical errorof 10% can be further

reduced at the 5%level using all information

P*l, Q2 and Mx

3/20/03 SLAC- B Day Marcello A. Giorgi 30

…and with higher and higher luminosity:

Rare B decays, for instance:Loop-mediated, FCNC: b sl+l-, b s , b sLeptonic: B , …

Unique possibility at B factories: fully reconstructed B tag 0.1% efficiency, very useful for channels with

missing energy ()Just began to exploit this possibility

3/20/03 SLAC- B Day Marcello A. Giorgi 31

...more..

Charm and Tau PhysicsSearch for mixing and CP violation in D

meson decays, …Rare decays, including LFV

3/20/03 SLAC- B Day Marcello A. Giorgi 32

Integrated luminosity vs physics

2sin

1 abLdt1.0 0.1 .105.0 0.2

BaBar2006 2009 ?

Physicsexamples:choosebenchmarks

cbub VV 2sin 2sin llKllX s

*, *, KX s

,

2002

3/20/03 SLAC- B Day Marcello A. Giorgi 33

From task force on Long Term Upgrades

Some Highlights:

BABAR is a VERY good detector: very difficult to improve it!! (IFR is the only intervention needed)

Only a few channels are systematically limited below 1 ab-1 ; many topics would benefit from 2-3 ab-1 or more

We need to integrate higher luminosity, well beyond 0.5 ab-1, to better constrain the Unitarity triangle, to study rare decays and try to open windows on New Physics.

More resources to PEPII would be beneficial for Physics

3/20/03 SLAC- B Day Marcello A. Giorgi 34

SVT•SVT has been un-cabled,taken to the clean room, split in two halves and removed from the B1 magnets•Once the SVT was exposed electrical tests and visual inspections were performed. We discovered the reason for some of the failures of the 9 non functioning readout sections,some modules fixed! Now only 4 out of 208 sections are not readable. SVT so far tested

for rad hardness up to 4 Mrad (OK!) rad tests are going on.Partial SVT replacement of modules already built,tested and soon ready in Pisa and UCSB is considered by 2005

3/20/03 SLAC- B Day Marcello A. Giorgi 35

Absorber Segmentation

7 layers 2 cm

1 layer 7 cm

2 layers 9 cm

2 layers 13 cm

2 layers 10cm

total 85 cm

New Forward EndCap

Terminology: 19 slots and 15 RPC layers

RPC belt

Slot18/195 brass layers(slot 8,10,12,14,16)

3/20/03 SLAC- B Day Marcello A. Giorgi 36

Barrel IFR Upgrade

The problem: dying RPCs.

Muon selectors losing efficiency impacting physics

Decreasing efficiencySome RPC completely off

Decreasing efficiencySome RPC completely off

3/20/03 SLAC- B Day Marcello A. Giorgi 37

IFR Barrel Upgrade

• Decision on technology made during Dec Collaboration Meeting.

• Project based on LST will be ready (WBS) by end of may 2’’3 and will be reviewd in June.

• Access for replacement of current RPCs is mechanically complex: significant engineering needed. Expect to upgrade in 2004 and 2005 to avoid an extremely long shutdown.

3/20/03 SLAC- B Day Marcello A. Giorgi 38

PEPII – “adiabatic” scenario

0

200

400

600

800

1000

1200

Year

Inte

gra

ted L

um

inosity ( fb-1

)

0

5

10

15

20

25

30

Peak L

um

inosity [10**

33]

Yearly Integrated Luminosity [fb-1]

Cumulative Integrated Luminosity [fb-1]

Peak Luminosity [10**33]

Yearly Integrated Luminosity [fb-1] 3 23 41 39 62,6 66,1 120,1 151 160,1 217 216

Cumulative Integrated Luminosity [fb-1] 3 26 67 106 168,6 234,7 354,8 505,8 665,9 882,9 1098,9

Peak Luminosity [10**33] 1 2 4,4 5 7,5 10 13 16 20 22 25

1999 2000 2001 2002 2003 2004 2005 2006 2007 2008 2009

0.5 ab-1

20061.6 x 1034

3/20/03 SLAC- B Day Marcello A. Giorgi 39

PEP-II Integrated Luminosity for Run 2002-2003 J. Seeman Dec 20, 2002

Year Month Days Peak to Peak Integrated Cumulative Positron Electron Beta y* Beta x* Number Comments

Average luminosity luminosity integrated current current bunches

Luminosity xE33 per period luminosity (mA) (mA) (cm) (cm)

Ratio (at end) fb-1 fb-1

2002 November 15 0,20 2,1 0,3 0,3 1100 650 1,20 50 642 Completed

2002 December 22 0,30 3,2 1,5 1,8 Nearly finished

2003 January 27 0,40 4,5 3,6 5,4 1800 1000 1,20 50 800 Run

2003 February 28 0,46 5,0 5,3 10,7 Run

2003 March 31 0,46 5,5 6,5 17,1 2200 1100 1,00 47 950 Run

2003 April 30 0,46 6,0 6,9 24,0 Run

2003 May 31 0,46 6,5 7,7 31,7 Run

2003 June 30 0,43 7,0 7,5 39,2 Run

2003 July 31 0,43 7,5 8,3 47,6 2500 1300 0,90 45 1050 Run

2003 Aug-Sept 61 0,00 0,0 0,0 47,6 Down

2003 October 31 0,25 3,0 1,0 48,6 Start up

2003 November 30 0,35 6,0 4,1 52,6 2300 1200 0,95 47 1000 Run

2003 December 22 0,46 8,0 6,1 58,8 2500 1320 0,90 45 1100 Run

3/20/03 SLAC- B Day Marcello A. Giorgi 40

PEP-II Eight Year Run Plan for FY2003 Thru FY2010 J. Seeman January 13, 2003

Year Months Days Average Peak Integrated Cumulative e+ e- Beta y* Beta x* Emit B-B tune Num Cont. MD Comments

to peak luminosity luminosity integrated current current horiz shift Bunch Inj. time + large

lumin. xE33 per period luminosity (mA) (mA) (cm) (cm) (nm) (vert/horiz) factor factor upgrades

ratio (at end) fb-1 fb-1 +/-

Start 0,5 4,4 103,0 1675 975 12,5 50 25/50 0.035/0.07 762 1,00 0,95

2003 Jan-July 200 0,5 7,53 46,4 149,4 2400 1250 10 50 30/50 0.044/0.073 1180 1,00 0,90

2003 Aug-Sept 60 0 0 0,0 149,4 HER8

2003 Oct-Dec 80 0,4 7,53 10,4 159,8

2004 Jan-June 170 0,55 11,4 72,3 232,0 2700 1500 9 50 30/45 0.053/0.076 1400 1,05 0,90

2004 July-Sept 90 0 0 0,0 232,0 LER4, IFR

2004 Oct-Dec 80 0,4 11,4 15,8 247,8

2005 Jan-June 170 0,55 15,4 107,2 355,0 3300 1600 8 50 35/50 0.056/0.074 1450 1,10 0,90

2005 July-Dec 180 0 0 0,0 355,0 HER9,SVT,IFR

2006 Jan-Mar 80 0,4 15,4 21,3 376,3 +cross'g angle

2006 Apr-July 120 0,5 19,1 97,7 474,0 3600 1760 7 50 32/47 0.056/0.077 1650 1,15 0,95

2006 Aug-Sept 60 0 0 0,0 474,0 HER10

2006 Oct-Dec 80 0,4 19,1 26,4 500,4

2007 Jan-July 200 0,55 20,4 205,1 705,4 3600 1980 7 50 35/54 0.057/0.078 1550 1,15 0,95

2007 Aug-Sept 60 0 0 0,0 705,4 LER5

2007 Oct-Dec 80 0,45 20,4 31,7 737,2

2008 Jan-July 200 0,6 25 274,0 1011,1 4500 2000 6,5 50 35/50 0.057/0.082 1700 1,20 0,97

2008 Aug-Sept 60 0 0 0,0 1011,1

2008 Oct-Dec 80 0,45 25 38,9 1050,0

2009 Jan-July 200 0,6 25 311,0 1361,0 4500 2000 6,5 50 35/50 0.057/0.082 1700 1,20 1,00

2009 Aug-Sept 60 0 0 0,0 1361,0

2009 Oct-Dec 80 0,45 25 38,9 1399,9

2010 Jan-July 200 0,6 25 311,0 1711,0 4500 1980 6,5 50 35/50 0.057/0.082 1700 1,20 1,00

End total 2590 1711,0

3/20/03 SLAC- B Day Marcello A. Giorgi 41

A very promising physics program

• We have a and ambitious physics program until the end of this decade based on increase of of PEP II luminosity with a more aggressive scenario if the integrated luminosity would go well beyond 1/ab by the end of the decade.

3/20/03 SLAC- B Day Marcello A. Giorgi 42

What after 2010

In B physics beyond 1- 2/ab?A lot of measurements but....

...........10 36??

Possibly yes!

3/20/03 SLAC- B Day Marcello A. Giorgi 43

BACKUP

3/20/03 SLAC- B Day Marcello A. Giorgi 44

Towards sin2: B0

3433413N

Acp

0.080.080.22 ( ) 0.07( )CPA stat syst

0.180.19

0.250.25

0.45 ( ) 0.09( )

0.16 ( ) 0.07( )

C stat syst

S stat syst