BABAR Future
Plans
Marcello A. Giorgi
on behalf of BaBar Collaboration
FPCP 2003- PARIS
Ecole Polytechnique 06/05/03
FPCP2003
Marcello A. Giorgi
1
Canada
[4/18]
China
[1/5]
France
[5/55]
Germany
[3/30]
Italy
[11/101]
The Netherlands Norway
[1/2]
[1/3]
IFR
USA
[38/290]
United Kingdom
[10/66]
The BABAR
Collaboration
DIRC
10 Countries
75 Institutions
579 Physicists
DCH
EMC
SVT
Ecole Polytechnique 06/05/03
FPCP2003
Russia
[1/9]
BABAR
COIL
Marcello A. Giorgi
2
BaBar Physics Mission
New environment: high luminosity asymmetric
collider
1)Search for CP violation in B meson decays largely predicted by
the Standard Model
2)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 !
TRY to open windows on new Physics beyond Standard Model
Rare B decays, Charm study, Tau rare decays
Ecole Polytechnique 06/05/03
FPCP2003
Marcello A. Giorgi
3
CP,T,CPT
(FY03)
A simultaneous fit to tagged and untagged data gives :
Dm ,sin2b (consistent with previous analysis)
|Acp/ Acp | (consistent with no direct CP violation (4.5%)
(Wrong tag with K due to DCS allowed. DG/D m, z, l, |q/p| left free!)
90% CL
z2
M  i 2G
Dm  i 2 DG
From dileptons
Measurement of sin2b=0.741  0.067  0.034
Ecole Polytechnique 06/05/03
FPCP2003
Marcello A. Giorgi
4
BaBar achievements on CP
dN exp(–|Dt|/tB) ( 1 ± D (S sin(DmDt) - Ccos(DmDt)) )  R
A simultaneous fit to tagged and untagged data gives :
Dm ,sin2b (consistent with previous analysis)
|Acp/ Acp | (consistent with no direct CP violation (4.5%)
(Wrong tag with K due to DCS allowed. DG/D m, z, l, |q/p| left free!)
Measurement of sin2b=0.741  0.067  0.034
sin2eff from B0  +-
S   0.02  0.34( stat )  0.05( syst )
C   0.30  0.25( stat )  0.04( syst )
eff= +is a strong phase
BABA
R
Belle
2 2
Bell
e1
cf. Gronau and Rosner, Phys. Rev. D65,
093012 (2002)
Ecole Polytechnique 06/05/03
FPCP2003
With no informations about penguin pollution:
Measure S and Cfrom both sinDmDt and
cosDmDt terms .
•Compare with predicted S and Cvalues
for given , b, |P/T|, and .
Assume for instance:
9721+30,b26 |P/T|=0.28, /2<</2
Marcello A. Giorgi
5
Not only B Physics in BABAR !
A new state decaying into D+s(1970) and 0 has
been discovered by us and recently confirmed by
CLEO!
D+s 0
D+sK+K- + 0
D+sK+K- +
Ecole Polytechnique 06/05/03
FPCP2003
Marcello A. Giorgi
6
Luminosity: Present and Future
So far in Run 3: On peak 30.91 fb-1
Off peak 2.57 fb-1
Summer 2002 and FY2002
Winter 2003:
Run 1 + Run 2
On peak 83.9 fb-1
Off peak 9.6 fb-1
92 M BB pairs
Summer 2003:
Run 3
add 40 fb-1
By end 2006:
500 fb-1
FY2003
Longer
term
By the end of the decade:
12 ab-1
Ecole Polytechnique 06/05/03
FPCP2003
Marcello A. Giorgi
7
PEP-II Upgrade Plans
<2005
>2005
LER energy
HER energy
LER current
HER current
by*
bx*
X emittance
Estimated sy*
Bunch spacing
Number of bunches
Collision angle
Beam pipe radius
Now
3.1
9.0
1.8
1.0
12.5
35
50
5
1.89
921
head-on
2.5
Projected
3.1
9.0
2.4
1.4
9.0
35
50
4.3
1.89
1130
head-on
2.5
Upgrade
3.1?
9.0?
3.3
1.5
5.0
35
50
3
1.26
1700
3.25
2.5
Luminosity
51033
81033
21034
Ecole Polytechnique 06/05/03
FPCP2003
Marcello A. Giorgi
GeV
GeV
A
A
mm
cm
nm-rad
mm
m
mrads
cm
cm2 sec1
8
2x10 34 Interaction Region
with a ±3.25 mrad Xangle
30
QF2
QF5
1
3.
QD4
20
G
eV
Extra
focusing
QD1
QD1
Centimeters
10
9 GeV
0
9 GeV
-10
QD1
QD1
Extra
focusing
-20
1
3.
-30
-7.5
G
QD4
eV
-5
2 cm radius and 1 cm radius beam pipes
QF5
QF2
-2.5
0
2.5
5
7.5
Meters
M. Sullivan
Jun. 14, 2000
The 1 cm radius beam pipe intercepts about 5 kW of
power from the LER and nearly the same amount
from HER
Minimum amount of material in the detector beampipe
This conflicts with having enough SR shielding (usually a thin coating of Au)
to keep detector occupancy at acceptable levels
Minimum radius for the beam pipe
This must be balanced with the requested thickness of the beam pipe. The
smaller the beam pipe the more power it must be able to handle (kW).
Ecole Polytechnique 06/05/03
FPCP2003
Marcello A. Giorgi
9
(>FY03)
What next for Sin 2b
We can improve the
expt. error on sin2b
with luminosity in time
dependent asymmetry
for channels as:
bccs O(l2) (golden
mode as J/yKs) or
0.5 ab-1
bccd O(l3) (such as
D (*)+ D(*)-) ,
where the leading
term gives sin2b
Ecole Polytechnique 06/05/03
FPCP2003
0.5 ab-1
Marcello A. Giorgi
10
What next for Sin 2b
(>FY03)
Pure penguin process
B
FKs
NEW PHYSICS ?
New quanta in the loop?
The present value with 80 /fb is:
S=sin2b=-0.19-0.50+0.52 stat.±0.09syst.
But also B
h’ K and B
KKK
How to go from eff to  ?
channel with isospin analysis?
r with Dalitz plot analysis?
Ecole Polytechnique 06/05/03
FPCP2003
Marcello A. Giorgi
11
Integrated luminosity vs physics
2002
2006
BaBar
 2009 ?
t  m
0.1
Continuous
improvement
0.5
1.0
2.0
10.  Ldt ab 1 
Vub Vcb sin 2 b sin 2 
X s l + l  , K *l + l 
X s , K *
t , m
r  
sin 2b +  
Ecole Polytechnique 06/05/03
FPCP2003
Marcello A. Giorgi
12
Some comments about comparison with
Hadron machine expts.
CKM parameters
BABAR/Belle
2 ab-1
Sin2b(charmonium)
0.015stat/0.018syst
Sin2b (penguins bsss)
0.10 stat
in 2S eff(B0 +
0.06 stat
eff –  ( B0 0 0 )
<10°
Sin(2b) (B0 D*00 )
0.15
 (B DK)
7°
|Vub|
1.4%+ Th. Unc.(now at best 10%)
BTeV/LHC-B
107 s
0.025/0.014
---0.024/0.056
------<10°/<19°
----
Of course Bs mixing and decay can be studied well at hadron
machines ( and a lot of good physics from Bs see talk of
R.Fleisher at this conference.
Ecole Polytechnique 06/05/03
FPCP2003
Marcello A. Giorgi
13
Rare decays - Summary
Channel
BF
bs
3.3±0.3 10-4
BK*
B r ()
510-5
210-6
25K
----
bsm+m
bse+eBK*m+m
BK*e+e-
6.0±1.5 10-6
3.6K
bs
BK*
4.1±0.9 10-5
5.010-6
Bt
Bm
510-5
510-7
2.0±1 10-6
BTeV/LHC-B (107 s)
----
2.2K/4.5K
----------
BABAR/BELLE (2 ab-1)
44.0K
6.8K(Btagged)
24.0K
1.2K
1.2K
1.4K
0.5K
0.6K
Asymmetries!
30
6
70
35
Limit< 10-8
tm
Rates…
Fully
reconstructed
B on the other
side are used
The so called
B beam
option
Bfactory and hadron machine measurements are complementary !
Ecole Polytechnique 06/05/03
FPCP2003
Marcello A. Giorgi
14
What about Detector?
SVT!
BABAR is a VERY good detector: very difficult to improve it!! (On IFR barrel is the only
major intervention needed)
SVT is 98% efficient. No degradation due to irradiation has been observed so far
SVT so far tested
for rad hardness up
to 4 Mrad (OK!) rad
tests are going on.
Partial SVT
replacement is
considered by
2005. Almost 50%
of modules built as
spare.
Ecole Polytechnique 06/05/03
FPCP2003
Marcello A. Giorgi
15
IFR Barrel Upgrade
Many RPCs die since 1999.
Fraction effectively dead is now
almost 40%
Muon selectors losing efficiency
Decision taken to increase the
thickness of the absorber and
to replace the bakelite RPC
with a more robust detector
(Limited StreamerTube).
INTALLATION 2004 &2005
Ecole Polytechnique 06/05/03
FPCP2003
Marcello A. Giorgi
16
Summary
FY2003-
Decision taken to rebuild the IFR Barrel with a new
technology (LST)
Preliminary measurements of pure penguin processes for
sin2b, measurements of Vub, B->DK, B->r.
FUTURE –
In 2005 install IFR Barrel and Spare modules of
SVT, to replace the heavily irradiated on horizontal plane.
Approach the precision measurement with 0.5/ab of integrated
luminosity . Towards more than 1.0/ab explore possible openings
for new physics.
Study of CP asymmetries but also rare decays in b, c and tau
sectors.
Ecole Polytechnique 06/05/03
FPCP2003
Marcello A. Giorgi
17
AND for MORE....
10
Ecole Polytechnique 06/05/03
FPCP2003
Marcello A. Giorgi
36
18
BACKUP
SLIDES
Ecole Polytechnique 06/05/03
FPCP2003
Marcello A. Giorgi
19
Some comments about comparison with
Hadron machine expts.
Lumi(10 33)
Bfactories
10
BTeV
0.2
LHC-B
0.15
The extraction of  from 
s bb(nb)
1.1
bb(107/year)
s bb /s qq
11
3 10-1
100000
20000
1 10-3
5 105
75000
5 10-3
effective
is possible using Bfactory data.
0 reconstruction is an essential ingredient!
Bfactory allow the rchannel analysis (0are involved! )
Ecole Polytechnique 06/05/03
FPCP2003
Marcello A. Giorgi
20
Time dependent rate,flavor mixing and CP,T,CPT
CPV in Mixing Decay
CPV direct
Time dependent rate:
dN exp(–|Dt|/tB) ( 1 ± D (S sin(DmDt) - Ccos(DmDt)) )  R
___
q A cp
l  hcp
p Acp
S
2 Im l
1+ l
2
C
R is the time resolution
z2
M  i 2G
Dm  i 2 DG
Ecole Polytechnique 06/05/03
FPCP2003
1+ l
2
B0
mixing
D is the mis-tag dilution
1 l
2
A fC P
CP
AfCP
B0
z0 CP & CPT violation
Marcello A. Giorgi
f CP
Dt
21
(FY03)


S
2 Im l
1+ l
2
C
CP,T,CPT
1 l
2
1+ l
2
b
From dileptons
Measurement of sin2b=0.741  0.067  0.034
Ecole Polytechnique 06/05/03
FPCP2003
Marcello A. Giorgi
22
sin2eff
from B0  +-
9721+30,b26
|P/T|=0.28,
Tree
and Penguinamplitudes
/2<</2
contribute to this channel
eff= +is a strong phase
In absence of informations about
penguin pollution:
• Measure S and Cfrom both
sinDmDt and cosDmDt terms .
• Compare with predicted S and
Cvalues for given , b, |P/T|,
Belle 2
and . Assume for instance:
30 
  (97 +
 21 )
b  26 
BABAR
Belle 1
P / T  0.28


2
< <

2
cf. Gronau and Rosner, Phys. Rev. D65, 093012 (2002)
Ecole Polytechnique 06/05/03
FPCP2003
Marcello A. Giorgi
23
BACKUP
Ecole Polytechnique 06/05/03
FPCP2003
Marcello A. Giorgi
24
PEPII – “adiabatic” scenario
1200
30
Yearly Integrated Luminosity [fb-1]
Cumulative Integrated Luminosity [fb-1]
25
Peak Luminosity [10**33]
800
20
600
15
Peak Luminosity [10**33]
Integrated Luminosity ( fb-1)
1000
0.5 ab-1
400
10
200
5
0
0
1999
2000
2001
2002
2003
2004
2005
2006
2007
2008
2009
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
Year
2006
Ecole Polytechnique 06/05/03
FPCP2003
Marcello A. Giorgi
1.6 x 1034
25