Transcript Slide 1

Belle/KEB status & plans
P5 meeting
SLAC 10/5/05
S.L. Olsen
U. of Hawai’i
φ1, φ2, φ3; penguins; new particles;…
+plans for Super-KEKB/Belle
The KEKB Collider (8 x 3.5 GeV, X angle)
L=(1.6 x 1034)/cm2/sec
Int(L dt)= 469 fb-1
On- resonance~420fb-1
KEKB Collider
Status of Asymmetric B Factories
Used this summer
KEKB
Ldt  2(t/14mo)
PEP-II
Normal injection
Continuous injection
661/pb/day
1182 pb/day
collaboration
Detector performance
Pt resolution (s in %)
M(p0) resolution (s in MeV)
(Bp+p-: s(DE)21MeV)
(Bp0p0: sM(p0)8MeV)
4.5MeV
0.3%
1 GeV/c
100MeV
1 GeV
Particle ID in Belle
~80%
~8%
SVD Occupancy
Present : layer 1 of SVD
~10%
~4%
~2%
~2%
~10% occupancy / 200 Krad.yr-1
SVD2
L~1.6x1034 → L~5x1034 cm-2s-1 ???
DAQ upgrades
w/o
Event Builder
Upgrade
Present
operation
Faster signal processing
with CMS chip in SVD
(Silcon vertex det.)
New pipelined data
Acquisition system (COPPER)
The B Factory Physics Program
1) Measure of Fundamental SM Params:
CKM elements & phases
2) Search for New Physics:
look for evidence of new particles in loops
3) Unanticipated new phenomena:
large s(e+e-cccc), X(3872),Y(3940),..
4) + lots of “bread & butter”
hc’, cc2’, D**,Sc*, t -physics, spin frag-fcn,…
Warning: I can only give a few small tastes from this rich & flavorful menu
sin21 from BfCP + BBfCP interf.
Sanda, Bigi & Carter:
Vcb
J/y
B0
KS
+
V*td
J/y
Vtb
B0
B0
Vtb
V*
td
KS
2
V*
td
Principle of CPV Measurement
(B0 or B0 ?)
J/y (r+)
fCP
t=0
B-B
B+B
KS (r-)
Dz
more B’s
more B’s
t  Dz/(cβγ)
= (1-2w)sin21
= (1-2w)sin21
_
2005: B0  J/y K0 w/386 M BB pairs
B0  J/y KS0
Nsig = 5264
Purity 98 %
CP odd
*2
M bc  Ebeam
- PJ*/2yKs
B0  J/y KL0
Nsig = 4792
Purity 60 %
CP even
CP side:s(Dt)0.5ps tag side:s(Dt)0.9ps
_
2005: B0  J/y K0
sin21= 0.652 ±0.039 (stat) ±0.020 (syst)
A = 0.010 ±0.026 (stat) ±0.036 (syst)
B0 tag
_
B0 tag
BG subtracted distributions
(good tag region)
previous result
sin21= 0.728
_  0.061
(152 M BB pairs)
consistent ~1.2s
1 measurement
1~70o ?
sin21
?
1~20o
1
2-fold ambiguity
21  p-21
_
(D0  KSp+p-)
Belle’s New Method for Direct measurement of 1
B0  D0h0
AB0D0h0(Dt) =
M(KSp-)
f-+
cos(DMDt/2)
M(KSp+)
-)
i2
M(K
p
1
S
-e hh0
f+M(KSp+)
sin(DMDt/2)
_
Reconstruction of B0  D[KSp+p-]h0
D0 p 0
Nsig = 157 ±24
purity : 59%
D0 w
Nsig = 67 ±10
purity : 86%
D0 h
D*0 p0, h
Nsig = 58 ±13
purity : 60%
Nsig = 27 ±11
purity : 52%
D*0  D0 p0
TOTAL
Nsig = 309 ±31
purity : 63%
Time-Dependent Dalitz fit results
Belle preliminary
Final state
1 (o)
D0 p0
11 ± 26
D0 w, h
28 ± 32
D*0 p0, h
25 ± 35
combined
16 ±21(stat) ±11(syst)
-30o < 1 < 62o
(95% C.L.)
Implications of Time-dependent Dalitz analysis
Consistent with B0J/yK* results
cos21 = 0.87 ±0.75, hep-ex/0504046
1~70o ?
sin21
(^_^)
?
1~20o
1
2-fold ambiguity
resolved !
Disfavored
>2s
Experimental Situation for Bp+ p- in 2004
Belle 152 M BB
with 372±32 B0→p+p− events
Spp  -1.00  0.21 0.07
App  +0.58  0.15  0.07
PRL 93, 021601 (2004)
BABAR 227M BB
with 467±33 B0→p+p− events
Spp  -0.30  0.17  0.03
App  +0.09  0.15  0.04
hep-ex/0501071
5.2s CPV,
First evidence for DCPV (3.2σ)
Also ~3.2s difference between Belle and BaBar
B0 tagged
B0 tagged
4s signal for Direct CPV
App  +0.56  0.12  0.06
Spp  -0.67  0.16  0.06
p+p− A
CP
p+p− Yield
2005 results: Bkg subtracted Bp+ p- projections
DE-Mbc 2D fits to individual
time intervals
0  2  19
&
Dt (ps)
71  2  180
App
2005: Status of Bp+ p-
Belle
275M
Spp
BABAR 227M
~2.3s difference between
- App
Belle and BABAR
(Cpp )
Spp
Belle’s measurement of ACP(Bp0 p0 )
Br(p 0p 0 )  (2.3+-00..45+-00..23 ) 10-6
ACP (p 0p 0 )  +0.44+-00..53
52  0.17
275M
BBbar
pairs
hep-ex/0408101
published in PRL
CPV in B0 r+rSimilar to Bp+p-, but in principle more complicated …
B  VV: not a single CP eigenstate
r+  p+p0: wide resonance, two p0’s in the final state.
Three miracles:
fL ~ 100%  CP  +1
Br(pp)NR and int. small
B(r0r0) << B(r+r-), B(r+r0)
(26  6 ) x 10-6 (HFAG Winter05)
A+-/ 2
2q
small Penguin pollution (q )
A00
< 1.1
30  6
A+0
B0 r+r- signal
275M BB
continuum
bc
signal
bu
B = 24.4 2.2
 3.8
4.1
x 10-6
Mpp
Helicity
continuum
continuum
signal
r pp
0.029
fL= 0.951  0.033

0.039
0.031
[Belle-CONF-0545]
2005: Belle Results on CPV in Br+rPreliminary (274  106 BB pairs)
q=1
q=-1
Low quality
tag
High quality
tag
Results:
Arr  0.00  0.30( stat ) +-00..10
09 ( syst )
S rr  0.09  0.42( stat )  0.08( syst )
No CPV φ2 is near 900
Belle Constraints on 2 (α)
Bpp [hep-ex/0502035] & rr combined
Brr only
2  87  17
59  2  115
2  93
at 90% CL
+12
-11
75  2  113 at 90% CL
3 () measurement
Vud Vub*  (a)
2
Vtd Vtb*
3()
Simple mixing CPV
 3 (with Bd )
1(b)
*
Vcd Vcb
Tree
b
+
d
B
u
Vub
W

Vcs
O(l3)

Vus
u
c
s
u
D0
fCOM
K+
b
B
+
d
u
Tree
W
Vcb
O(l3)
Interference of bc and bu diagrams
s
u
K+
c
_
D0
u
fCOM
Belle method for 3: Dalitz
3) fCOM = D0  KSp+pB+:
m-2
r
D0
m
D0
2
-
m+2
B-:
obtain
from
tagged D0
(D*+ D0p+)
sample
m+2
r
r
|A2|
= |A |
1
CPV: Asymmetry in Dalitz dist.: m+=m(Ksp+), m-=m(Ksp-)
BD(*) K(*), DKS p+p-
275M BB
209
signal
D0K
58
signal
D*0K
[D0p0]
36
D0K*
signal
[hep-ex/0411049]
[hep-ex/0504013]
3 Results (Belle and BaBar)
[hep-ex/0411049,0504013]
3 = 63 
[hep-ex/0504039]
15
13
deg.
(Non-trivial constraint)
Current status
CPV angles only:
η=0.321±0.027
r=0.193±0.57
consistent with
constraints from
measmts of lengths
of sides only:
η=0.342±0.022
r=0.216±0.036
Simplistic(?)
summation: 1+ 2+ 3  182o  ~20o
SM with KM ansatz works
remarkably well for tree-level
processes
Next step: use bs penguins
Example:
no KM phase
*
Vtd
, h’, K+K-
+
Vtd*
SM:
, h’, K+K-
B
B
eff
sin21 = sin21 from
1
1
_
BJ/y KS (bc c s)
unless there are other, non-SM particles in the loop
How New Physics contributes to bs
B 0  K 0
b
d
W+
New physics in loops?
u , c ,t
g
B0
s 
s
s K0
d S
b
d
s
KS0
d
Many new phases are
possible in SUSY
B 0  h K 0
h
B0

s
B0
“Internal Penguin”
s
h
KS0
b
s
s
B0
d
h
s
KS0
d
Belle 2005:
Significant CP Violation in a bs penguin mode!!
>>all systematically below sin(2b)
Many bs modes were studied:
>>QCD corrections :
sin2b(penguin)>sin2b(tree)
recent QCD factorization estimates :
[Beneke, hep-ph/0505075]
[Cheng,Chua,Soni, hep-ph/0506268]
sin2φ1(penguin)-sin2φ1(tree)
sin21(penguin) = 0.50  0.06
(HFAG’s “naïve average”)
0.4-
EW
penguins
(loops with virtual
t’s, W’s, & Z’s)
B Kl +l - K*l +l -
1st measurement of AFB(BK* l l)
Interference btw  and Z
AFB (Kl +l -) = 0.09  0.14 (stat)
AFB(K*l +l - ) = 0.56  0.13 (stat)
already rules out some new physics scenarios
First Observation of bd 
signal
qq
K*
other B
_
Addresses the same physics issue as Bs- Bs mixing
(future Tevatron RunII goal).
Implications of Belle’s observation of bd 
BR(B  ( r / w )  )
BR(B  K  )

Vtd
Vts
2
Same physics as Bs mixing
68%CL
95%CL
Full UT fit
r
bonuses:
new mesons, many puzzles!
hc’
Z(3931)
cc2’?
X(3872)
Y(3940)
e+e-cccc
not seen in s(e+e-hadrons)
at Ecm =4.26 GeV
Y(4260)
Y(4260)
hc”??
M(wJ/y) MeV
KEKB near term
• During the recent summer shutdown (2005)
– one more RF station for ARES cavity (a klystron, low level
control …) in HER (to be named as D5E)
• Increase of the HER beam current by about 150mA
• One RF station costs about 2 Oku-yen.
– new movable masks in LER: Cu head
– solenoids for electron cloud
• Upgrade the 50 power supplies for solenoid coils (3A -> 5A)
• test of thin coils inside quadrupole magnets
– 3.5  3.27 (lower?) bucket spacing?
• Crab cavity (Jan 2006)
– A crab cavity for the purpose of raising the beam-beam
parameters is scheduled to be installed in each ring at the
beginning of 2006.
Comparison of Specific Luminosity
3.5 bucket spacing
3.77 bucket spacing
Crab crossing in Jan 2006
Crab crossing may boost the beam-beam parameter up to 0.19 !
y
(Strong-weak simulation)
K. Ohmi
Head-on (crab)
◊
◊
◊
◊
◊
(Strong-strong simulation)
crossing angle 22 mrad
Superconducting crab cavities are
under development, will be installed in
KEKB in early 2006.
K. Hosoyama, et al
Lumiinosity projections for KEKB
Lpeak = 1.61034 cm-2s-1
Ltot = 469fb-1
world records !
~1010 BB/year !!
& similar number
of t+t-
Major upgrade of
KEKB & Belle detector
(>1yr shutdown)
crab
cavities
Lpeak (cm-2s-1) 1.6x1034
Lint
469 fb-1
5x1034
~1 ab-1
5x1035
~10 ab-1
SuperKEKB: 2010
Interaction Region
Crab crossing
q=30mrad.
by*=3mm
New QCS
New Beam pipe
More RF power
Ante-chamber & solenoid coils
to reduce photo-electron clouds
Damping ring
Linac upgrade
Bkg & TRG rate in future
x20 Bkg
KEKB SuperB
Luminosity
~1
50
HER curr. (A)
LER curr. (A)
vacuum (10-7Pa)
1.2
1.6
~1.5
4.1
9.4
5
Bkg increase
-
x 20
TRG rate (kHz)
0.4
14
phys. origin
Bkg origin
0.2
0.2
10
4
(1034cm-2sec-1)
x10 Bkg
KEKB
Bkg
SVD
CDC PID / ECL KLM
Shynchrotoron radiation
Beam-gas scattering (inc. intra-beam scattering)
Radiative Bhabha
Belle tracking with 20x background
Bkg x 20
now
4 Higher background ( 20)
Issues:
- radiation damage and occupancy
- fake hits and pile-up noise in the EM
4 Higher event rate ( 10)
- higher rate trigger, DAQ and computing
4 Require special features
- low p m identification f smm recon. eff.
- hermeticity f n “reconstruction”
Belle Upgrade for Super-B
SC solenoid
1.5T
m / KL detection
14/15 lyr. RPC+Fe
CsI(Tl) 16X0
g pure CsI (endcap)
Aerogel Cherenkov counter
+ TOF counter
“TOP” or DIRC
g tile scintillator
Tracking + dE/dx
small cell + He/C2H5
gremove inner lyrs.
fast gas+Si r<20 cm
New readout
and
computing
systems
Si vtx. det.
4 lyr. DSSD
g 2 pixel/striplet lyrs.
+ 4 lyr. DSSD
CKM Unitarity Triangle at
1(trees)
1(penguins)
(indiv. Modes)
50 ab-1
AFB(BK l+ l-)[q2] at Super Belle
• Assume 1 year of running at 5x1035/nb/sec
•  5/ab integrated luminosity, 10 billion B
mesons!!
– At present, ~0.46/ab
DA9/A9~11%, DA10/A10~13%
– A7 fixed to SM value
AFB K*ll with 5/ab
Donut : B(BXsll)
with140/fb + 100/fb
Belle Toy MC with 5/ab
Determine location of the zero crossing
C10NP
C9NP
Possible schedule for Super B
J-PARC 1 construction
Construct.
fund
ILC construction
T2K
SuperKEKB const.
Operation
fund
Crab cavity
KEKB
machine
“Minor” upgrade
Belle
2004
05
SuperKEKB
>1000fb-1
KEKB
06
07
08
“Major” upgrade
09
Calendar year
10
11
12
budget for Super B
J-PARC construction
ends here
A “balanced” world program for HEP
n experiments,
gm-2, mge, etc.
LHC, ILC
n mass and mixing,
CPV, and LFV
Mass spectrum,
interactions
New
physics
Quark sector
t LFV,
t CPV
Flavor mixing,
CP phases
Super B factory,
LHCb, K experiments etc.
Final comment
The most important single contributing
element to whatever success Belle & KEKB
has had to date has been the stimulating
& energizing competition with BaBar and
PEP-II.
Belle & KEKB people sincerely hope this
very productive competition will continue.
Backup Slides
.“Observation”
One more nail in the
Superweak coffin.
of Direct CP violation in BK- p+
0 K
Evidence for BK
_
(hadronic bd s s processes)
Belle@250 fb-1
Measurements of B K0 K0 CPV
at Super B will be possible.
Super KEKB parameters