Search for New Physics Phases
in b g s Penguins
Time-dependent CP Violation (TCPV) Measurements
at BABAR and Belle
M. Hazumi (KEK)
FPCP2004, Oct. 4-9, Daegu, Korea
Outline
• TCPV in hadronic b g s penguins
– ICHEP04 results for B0gfK0, K+K-Ks, hKs, f0(980)Ks, wKs, Ksp0
- New results for B0 g KsKsKs from Belle
• TCPV in radiative b g s penguins
– ICHEP04 results for B0 g K*0g, K*0 g Ksp0
3-body decays
with no need for
angular analysis
- New results for B0 g Ksp0g (including K*0g) from Belle
• Summary
October 7, 2004
Masashi Hazumi (KEK)
FPCP2004
2
Related talks
• Theory in and beyond the Standard Model (SM)
 E. Kou, P. Ko, Y. Okada, …
• Basics of TCPV measurements
 K. Trabelsi
• Rare B decay reconstruction and background suppression
 Several speakers
• Future prospects
 Y. Kwon, T. Iijima
October 7, 2004
Masashi Hazumi (KEK)
FPCP2004
3
TCPV in hadronic b g s penguins
http://www.physics.purdue.edu/10E34/
•
•
TCPV in fKs already ranked as
observable
fKs not yet observed (needless to say, no TCPV measurement) as of June.2000
October 7, 2004
Masashi Hazumi (KEK)
FPCP2004
4
sin2f1 from bgs penguins at ICHEP04
sin2f1(bgsqq) = 0.43  0.08
CL = 3.410-4 (3.6s)
sin2f1(bgccs) = 0.726  0.037
My “optimistic” guess in 2000 underestimated the ability of B factories !
October 7, 2004
Masashi Hazumi (KEK)
FPCP2004
5
0
B
f
0
K
:
0
K
g Ks or KL
_
l2
l3
_
u
u
l1
(simplified explanation)
October 7, 2004
f ~ pure ss
(C  -A also used)
S  -CPsin2f1, A  0
if no new CPV phase
CP : CP eigenvalue
-1 for fKs
“sin2f1”
+1 for fKL
 -CP S
f • Small SM “tree pollution”
– CKM-suppressed: O(l2)
– OZI-suppressed: O(10-1)
• u-penguin (l4) also highly suppressed
Masashi Hazumi (KEK)
FPCP2004
6
_
227M BB
0
B

0
fK signals
_
275M BB
[hep-ex/0408072]
Plots for all signal events
Nsig: the total number of signal events in
the sample used for TCPV measurements
Ks g
p +p -
Nsig = 11412
Plots for signal-enhanced regions:
signals seen in the plots < Nsig;
Dt used for selection.
fKL:
f g K+KKL w/
EMC or IFR
October 7, 2004
Nsig = 13914
purity = 0.63
Nsig = 9818
purity = 0.17
Events/(50MeV/c)
fKs:
f g K+K-
[hep-ex/0409049]
Masashi Hazumi (KEK)
fKs:
f g K+K-
Ks g p+p-,
p0 p0
fKL:
f g K+KKL w/
ECL or KLM
Nsig=3615(stat)10(syst)
FPCP2004
sig + bkg_sum
bkg_sum
sig + B-bkg
B-bkg
7
TCPV
results for
_
227M BB

_
275M BB
[hep-ex/0408072]
“sin2f1” = +0.50 0.25 +0.07
-0.04
A
= 0.00 0.23 0.05
0
B
0
fK
[hep-ex/0409049]
“sin2f1” = +0.06 0.33 0.09
A = +0.08 0.22 0.09
fKs
S = 0.73
fit
Poor tags
fK0
(~0.9s @SM)
fKL
October 7, 2004
(~1.9s @SM)
Good tags
Masashi Hazumi (KEK)
FPCP2004
8
“sin2f1”
History of “sin2f1” with
0
fK
_
sin2f1 from ccs
BABAR
Belle
106
October 7, 2004
Masashi Hazumi (KEK)
FPCP2004
9
Checks: sin2f1
0
(B
[hep-ex/0409049]
 J/y KS/L)
Validation of new data sample (SVD2)_
SVD1: 152M BB
SVD1
S = 0.696  0.061 (stat)
A = 0.011  0.043 (stat)
Good tags
_
SVD2: 123M BB
SVD2
f K0
Good tags
Dt (ps)
S = 0.629  0.069 (stat)
A = 0.035  0.044 (stat)
4.5% (MC)
SVD1:
SVD2:
S = -0.68  0.46
S = +0.78  0.45

A = -0.02  0.28
A =+0.17  0.33
October 7, 2004
Masashi Hazumi (KEK)
many systematic
checks, all ok
FPCP2004
10
Other decay modes: B0 g X0Ks
CP
X0
K+K-
~+1
h
-1
X0
decay
h g rg,
hp+pr g p+ph g gg, p+p-p0
P
P’ T
T’








P’
f0(980) g p+p-




w
p0
w g p +p -p 0
p0 g gg








-1
•
•
•
Ks g p+p- for all modes
Ks g p0p0 only by BABAR for h Ks
d
T
l2 s
t
g
s
s
d
_
sss penguin
b
l2
t
g
_
sdd penguin
d
b
d
W-
l4
color-suppresed
T’
b
wKs only by Belle
W
u
s
u
s
s
d
l4
d
Masashi Hazumi (KEK)
FPCP2004
s
d
d
d
u
u
s
d
color-allowed
-
– not used for h g p+p-p0
October 7, 2004
P
b
W-
f0(980) +1
-1
W-
11
TCPV_results for B0  K+K-Ks_ (excluding fKs)
227M BB
275M BB
[hep-ex/0408076]
[hep-ex/0409049]
+0.17
“sin2f1” = +0.55 0.22 0.04 0.11 “sin2f1” = +0.49 0.18 0.04 -0.00
A
= -0.08 0.12 0.07
A
= -0.10 0.14 0.06
f(CP=+1)=0.890.080.06
f(CP=+1)=1.030.150.05
Nsig = 39928
purity = 0.56
(~0.7s @SM)
October 7, 2004
Raw Asymmetry
Nsig = 45228
(~0.9s @SM)
Masashi Hazumi (KEK)
S = 0.73
fit
Good tags
FPCP2004
12
0 g hKs
TCPV
results
for
B
_
_
227M BB
275M BB
[hep-ex/0408090]
“sin2f1” = +0.27 0.14 0.03
A
= +0.21 0.10 0.03
“sin2f1” = +0.65 0.18 0.04
A = -0.19 0.11 0.05
Nsig = 51227
purity = 0.61
October 7, 2004
Raw Asymmetry
Nsig = 81938
(~3.1s @SM)
[hep-ex/0409049]
Masashi Hazumi (KEK)
S = 0.73 (~0.4s @SM)
fit
Good tags
FPCP2004
13
0 g f (980)Ks
TCPV
results
for
B
0_
_
209M BB
275M BB
[hep-ex/0408095]
+0.23
“sin2f1” = +0.95 -0.32 0.10
A
= +0.24 0.31 0.15
“sin2f1” = -0.47 0.41 0.08
A = -0.39 0.27 0.08
Nsig = 9414
purity = 0.53
October 7, 2004
Raw Asymmetry
Nsig = 15219
(~0.7s @SM)
[hep-ex/0409049]
Masashi Hazumi (KEK)
S = 0.73
fit
Good tags (~2.9s @SM)
FPCP2004
14
TCPV results for B0 g wKs
_
275M BB
[hep-ex/0409049]
+0.13
Nsig = 317 (7.3s)
purity = 0.56
October 7, 2004
Raw Asymmetry
“sin2f1” = +0.75 0.64 -0.16
A = +0.26 0.48 0.15
Masashi Hazumi (KEK)
(~0.0s @SM)
Good tags
FPCP2004
15
Vertex reconstruction for B0 g Ksp0
p+ p-
Ks trajectory
B vertex
IP profile
g
g
Reconstruct B  Ks p0(g) vertex using Ks
trajectory and boost trajectory or IP profile
Sufficient resolution obtained
Validated with J/y Ks
(without using J/y)
S  J /y K S   +0.68  0.10
Good tags
A  J /y K S   +0.02  0.04
October 7, 2004
Masashi Hazumi (KEK)
FPCP2004
16
TCPV
results for
_
227M BB
B0
_
275M BB
[hep-ex/0408062]
+0.30
“sin2f1” = +0.35 -0.33 0.04
A
= -0.06 0.18 0.06
[hep-ex/0409049]
Nsig = 16816
purity = 0.55
high LR
Raw Asymmetry
* mmiss (not mES)
(~1.2s @SM)
7713 w/ vtx
(high+low LR)
“sin2f1” = +0.30 0.59 0.11
A = -0.12 0.20 0.07
Nsig = 30023
(192 w/ vtx)
October 7, 2004
g
Ksp0
Masashi Hazumi (KEK)
low
LR
Nsig = 8318
purity = 0.17
S = 0.73
(~0.7s @SM)
fit
Good tags & high LR
FPCP2004
17
sin2f1 from bgs penguins at ICHEP04
sin2f1(bgsqq) = 0.43  0.08
CL = 3.410-4 (3.6s)
sin2f1(bgccs) = 0.726  0.037
More decay modes are very welcome to elucidate the deviation
October 7, 2004
Masashi Hazumi (KEK)
FPCP2004
18
TCPV in B0 g P0Q0X0
T. Gershon and M. H., Phys. Lett. B 596 (2004) 163
B0
J=0
P0
L
Q0
L’
X0
• P0, Q0, X0 are CP-eigenstate spin-0 neutral particles.
• J = 0 for B0  total angular momentum of the P0Q0X0 system should also be 0.
 L’ = L.
• CP(P0Q0X0) = CP(P0)CP(Q0)CP(X0)(-1)L+L’ = CP(P0)CP(Q0)CP(X0)
• Therefore, P0Q0X0 is a CP eigenstate although it is a 3-body state !
P0, Q0, X0 can be all different  large variety
October 7, 2004
Masashi Hazumi (KEK)
FPCP2004
19
October 7, 2004
Masashi Hazumi (KEK)
FPCP2004
20
October 7, 2004
Masashi Hazumi (KEK)
FPCP2004
21
0
B
g KsKsKs (CP-even state)
_
b
B0
d
• No up quark in the final state  “pure” penguin
• First observation by Belle (Nsig ~ 12 @ 78fb-1)
_
s
d Ks
_
d
s Ks
_
s Ks
d
– Rather clean signal
– Room for improvement: Nsig can be larger
• BaBar confirmed the signal with higher statistics at
ICHEP04 (hep-ex/0408065)
– Br = (6.5 0.8 0.8) x 10-6
October 7, 2004
Masashi Hazumi (KEK)
FPCP2004
22
TCPV in
0
B
g KsKsKs from Belle
(~2.8s @SM)
“sin2f1” = -1.26 0.68 0.18
A = +0.54 0.34 0.08
New!
w/ VTX w/o VTX
total
Nsig
3 (p+p-
96
32
128
72
2 (p+p- & (p0p0
21
18
39
16
117
50
167
88
total
October 7, 2004
Masashi Hazumi (KEK)
Poor tags
Good tags
FPCP2004
23
sin2f1 from bgs penguins at FPCP04
WA
sin2f1(bgsqq) =
0.39  0.11 (Belle)
0.42  0.10 (BABAR)
World Average (WA)
sin2f1(bgsqq)= 0.41  0.07
sin2f1(bgccs) = 0.726  0.037
CL = 1.2 10-4 (3.8s)
October 7, 2004
Masashi Hazumi (KEK)
FPCP2004
24
TCPV in radiative b g s penguins
SM: g  polarized
B0 & B0 opposite
|S| ≈ 2(ms/mb)sin 2f1 ≈ 3%
A ~ 1%
New Physics  Large S, A
[e.g. Atwood,Gronau,Soni]
* New phase not necessary;
new amplitude that makes g
“more flavor-nonspecific” is sufficient.
gg
Masashi Hazumi (KEK)
p+ p-
B vertex
B0  K*[Ksp0]g
Analysis Technique: similar to B0  Ksp0
October 7, 2004
Ks track
FPCP2004
IP profile
g
25
B  K*[Ksp0]g TCPV
[hep-ex/0405082]
-
124M BB
[hep-ex/0409049]
Nsig=57 9
purity 0.65
275M BB
S=0
fit
Nsig=105 14
Good tags
S = +0.25 0.63 0.14
A = +0.57 0.32 0.09
S = -0.79  0.63
0.50 0.09
A fixed at zero
First step for new
eraHazumi
of b(KEK)
 sg FPCP2004
!
Masashi
October 7, 2004
26
Generalized AGS (AGHS)
D. Atwood, T. Gershon, M. H. and A. Soni, hep-ph/0410036
• Effective Hamiltonian
• Decay amplitudes : F can be a state with more than one particle
October 7, 2004
Masashi Hazumi (KEK)
FPCP2004
27
0
B
g
0
Ksp g
1
• Decay amplitudes described with Dalitz variables (s1, z)
– QCD respects both C and P, i.e. f(s1, z) remains the same.
– Also
– Thus
October 7, 2004
Masashi Hazumi (KEK)
FPCP2004
28
0
B
g
0
Ksp g
2
• TCPV
for any angular momentum between Ks and p0
Cf. In the SM, S = -(2ms/mb)sin2f1
October 7, 2004
Masashi Hazumi (KEK)
FPCP2004
29
Revisiting
0
B
g Vg
• TCPV formula
V = C eigenvalue of V
October 7, 2004
Masashi Hazumi (KEK)
FPCP2004
30
TCPV in B0 g Ksp0g (incl. K*gKsp0) from Belle
Statistical errors reduced !
S = -0.58 +0.46
-0.38 0.11
0.6 < M(Ksp0) < 1.8GeV/c2
use all including K* region
A = +0.03 0.34 0.11
Poor tags
New!
Good tags
Nsig = 10514
purity = 0.50
Cf. excluding
K* mass region
S = -0.39
+0.63
-0.52 stat)
A = +0.10 0.51 stat)
0.6 < M(Ksp0) < 0.8 or 1.0 < M(Ksp0) < 1.8GeV/c2
October 7, 2004
Masashi Hazumi (KEK)
FPCP2004
31
Summary
• TCPV in hadronic b g s transitions
–
–
–
–
New results for B0 g KsKsKs from Belle.
3.8s deviation from the SM with all results combined.
More data, more modes are very welcome.
Important to know DSSM precisely if measured deviation is not
so large (which is most likely) exp. 1034  1043 (Tony’s request)
th. 10%  10 ppb (my request)
• TCPV in radiative b g s transitions
– Generalized AGS oscillation
• Cinternal determines the asymmetry, not CP
• All P0Q0 states can be combined
– New results for B0 g Ksp0g (incl. K*g) from Belle
– Very promising approach to search for NP
October 7, 2004
Masashi Hazumi (KEK)
FPCP2004
32
Backup slides
October 7, 2004
Masashi Hazumi (KEK)
FPCP2004
33
TCPV in hadronic b g s penguins
• B g fKs as a simple and clean example
Dominant diagrams within the Standard Model (SM) similar diagrams for B0
+
(C  -A also used)
• SM “tree pollution”
– CKM-suppressed: O(l2)
– OZI-suppressed: O(10-1)
S  -CPsin2f1 if no new
A0
CPV phase
CP : CP eigenvalue of the final state;e.g. -1 for fKs
October 7, 2004
Masashi Hazumi (KEK)
FPCP2004
34
TCPV in hadronic b g s penguins
virtual particle (top quark, and more ?)
CP violation “same” as J/yKs
within the Standard Model (SM)
Penguin~O(l2), Tree~O(l4)
deviation = O(1)%
Penguin diagram
Estimations of hadronic uncertainties
Grossman, Isidori, Worah, PRD58, 057504 (1998)
London, Soni, PLB407, 61 (1997)
Grossman, Ligeti, Nir, Quinn, PRD68, 015004 (2003)
Gronau, Grossman, Rosner, PLB579, 331 (2004)
(not a complete list, sorry !)
Nice probe to search for new CP-violating phases
October 7, 2004
Masashi Hazumi (KEK)
FPCP2004
35
S term with new physics phase
• No guarantee that -2CP S < sin2f1
• Each decay mode has different “tree pollution within the SM”.
• Large |A| may also be possible, but strong phase difference is not guaranteed.
October 7, 2004
Masashi Hazumi (KEK)
FPCP2004
36
TCPV in hadronic b g s penguins
• One of the most important topics in HEP now
(and in the future)
– e.g. SUSY GUT  “Atmospheric neutrinos can
make beauty strange.”
• Experimental techniques well established
– Basics of TCPV measurements
– Basics of rare B decay reconstruction and
background reduction
October 7, 2004
Masashi Hazumi (KEK)
FPCP2004
37
0
B
f K0
→
0
fK
: CPV Result
S = 0.73
fit
Good tags
- 0.96  0.50 +-00..09
11
- 0.15  0.29  0.07
Poor tags
Good tags
- 0.15  0.29  0.07
fKS + fKL : S (fK0) = +0.06  0.33  0.09
A (fK0) = +0.08  0.22  0.09
2003 Result
S( fK S )  -0.96  0.50 +-00..09
11
A (fKS )  -0.15  0.29  0.07
~2s away from SM
October 7, 2004
Masashi Hazumi (KEK)
FPCP2004
38
SVD1/2 Data Checks
combined fit
SVD2 only
SVD1 only
Good tags
Good tags
SVD1:
4.5%
S = -0.68  0.46

A = -0.02  0.28
October 7, 2004
SVD2:
S = +0.78  0.45
A =+0.17  0.33
Masashi Hazumi (KEK)
FPCP2004
many systematic
checks, all ok
39
fKS/KL Results
fKS only
fKL only
S = 0.00  0.33
A = 0.06  0.22
-S =2.3  2.0
A = 0.6  1.2
Combined fit
October 7, 2004
Masashi Hazumi (KEK)
FPCP2004
40
0
B
 f KS : Mass & Helicity
f Helicity
Mass
bkg
October 7, 2004
Masashi Hazumi (KEK)
FPCP2004
41
0
B
 f K : Validations
Control sample
Lifetime fit w/ B  fK /KS
B  fK
tB+ = 1.67
October 7, 2004
+0.12
–0.11
Asymmetry fit w/ fK
B f KS
S(fK) = –0.03 0.20
tB0 = 1.59 +0.20
–0.19
Masashi Hazumi (KEK)
A(fK) = +0.22 0.15
FPCP2004
42
History of b  sqq CPV
October 7, 2004
Masashi Hazumi (KEK)
FPCP2004
43
B0K+K-KS : CP = 1 Mixture
Since B0  K+K-KS is 3-body decay,
the final state is a mixture of CP = 1.
How can we determine the mixing fraction?
CP = 1 fraction is equal to that of l=even/odd
CP = +1
J=0
B0
CP = +1
K+
J=0
decay
KS
l
Masashi Hazumi (KEK)
CP = (-1)l
l
K-
October 7, 2004
J=0
J=0
FPCP2004
44
B0K+K-KS : CP = 1 Mixture – cont’d
l-even fraction in |K0K0> can be
determined by |KSKS> system
CP = +1
l = even
Using isospin symmetry,
l = odd
100 + 0 %
- 15
October 7, 2004
Masashi Hazumi (KEK)
FPCP2004
CP even
45
Analysis of B 0  K+K–K S (I)
227 106 B pairs
Excluding f : dominant contribution (85%) of inclusive BR  much more statistics than fKS
Unknown a priori CP content: CP-even fraction must be determined experimentally
Angular moments analysis (main result):
Study  [K+K–] helicity angle distribution
| AB0 K +K -K 0 (cos  ) |2 
S
and:

P  P (cos  )
0,1,2
As2  2 P0 - 5 / 2 P2
Ap2  5 / 2 P2
Average moments computed from sum of
background-corrected signal weights, returned by
ML fit (“sPlot” technique [Pivk-Le Diberder, physics/0402083])
As2
fCP -even  2
 0.89  0.08  0.06
As + Ap2
Isospin analysis (cross check) [Belle, PRD 69, 012001 (2004)]
fCP -even
2(B +  K +KS0KS0 )

 0.75  0.11
(B0  K +K -K 0 )
ICHEP’04, Beijing, Aug 16-22, 2004
(statistical error only)
A. Höcker – sin2 in Loop-Dominated Decays with BABAR
46
0
B

+
K K Ks
• Large branching fraction
• color-allowed b g u may be a problem
• Mixture of CP-even and CP-odd; determined
experimentally.
October 7, 2004
Masashi Hazumi (KEK)
FPCP2004
47
Available decay modes (P0 = Q0 only)
October 7, 2004
Masashi Hazumi (KEK)
FPCP2004
48
f0(980)KS :p+p- Mass didtribution
r
Non-f0 components
are determined from
the M(p+p-)
distribution
October 7, 2004
fx
[
f(f0KS) = 91%
f(p+p-KS) = 2.3%
fr0KS) = 4.8%
f(fxKS) = 1.6%
Masashi Hazumi (KEK)
FPCP2004
49
Systematic errors on S
KKKS: effective sin2f1  0.17 for CP-even fraction
Ks p0
K*g
w Ks
h’ Ks
f0 Ks
f K0
K+K-Ks
VTX
0.02
0.06
0.01
0.01
0.02
0.01
0.01
flavor tag
0.01
0.02
0.04
0.01
0.01
0.01
<0.01
resolution
0.05
0.05
0.07
0.03
0.03
0.04
0.03
fit bias
0.03
0.03
+0.01
-0.10
0.01
0.03
0.01
0.01
signal
fraction
physics
parameters
0.07
0.02
0.10
0.02
0.05
+0.08
-0.06
0.02
0.02
0.01
0.01
<0.01
0.01
<0.01
<0.01
background
Dt shape
0.04
0.03
0.02
<0.01
0.04
0.01
<0.01
tag side
interference
<0.01
<0.01
0.01
<0.01
<0.01
<0.01
<0.01
TOTAL
0.11
0.10
+0.13
-0.16
0.04
0.08
0.09
0.04
October 7, 2004
Masashi Hazumi (KEK)
FPCP2004
50
m132
B0KsKsKs peaking background rejection
6p
B0c0Ks KsKsKs
bccs
VETOed
B0D0CPKs KsKsKs
Dalitz plot
m122
October 7, 2004
Masashi Hazumi (KEK)
B0f0(980)Ks KsKsKs
bs
kept
(P*(Ks1)< P*(Ks2)< P*(Ks3)
FPCP2004
51
0
B
g KsKsKs vertex reconstruction
3(p+p-) [3 tight]
3(p+p-)
[2 tight,1 loose]
2(p+p-) 1(p0p0)
October 7, 2004
vertex eff.
(SVD1)
vertex eff.
(SVD2)
77%
83%
86%
87%
62%
74%
Masashi Hazumi (KEK)
FPCP2004
52
0
B
October 7, 2004
g KsKsKs signals
Masashi Hazumi (KEK)
FPCP2004
53
B0 g KsKsKs proper time distribution
October 7, 2004
Masashi Hazumi (KEK)
FPCP2004
54
B0 g KsKsKs systematic error
Signal fraction
Possible fit bias
Vertexing
Background Dt shape
Dt resolution function
Tag-side interference
Flavor tagging
Physics parameters
Total
October 7, 2004
Masashi Hazumi (KEK)
S
A
0.103
0.030
0.021
0.078
0.119
0.019
0.040
0.006
0.18
0.033
0.018
0.047
0.011
0.041
0017
0.008
0.005
0.08
FPCP2004
55
Belle sin2f1 from bgs penguins
at FPCP04
October 7, 2004
Masashi Hazumi (KEK)
FPCP2004
56
TCPV in B0 g P0Q0g
• We consider B0 g P0Q0g and also B0 g P+P-g
• JPC = 1-- for g: in general different from spin-0 X0
• New physics effects are also different; important to check
correlations between radiative and hadronic b g s
• If P0Q0 or P+P- from resonance, AGS oscillation may take
place (see next slide about the AGS oscillation)
– B0 g K*0 g, K*0 gKsp0
– B0 g r0g, r0 g p+p-
October 7, 2004
Masashi Hazumi (KEK)
FPCP2004
57
Review of AGS oscillation
D. Atwood, M. Gronau and A. Soni, Phys. Rev. Lett. 79, 185 (1997)
• In the Standard Model (SM), TCPV in B0 g Vg ~ 0
– V represents CP-eigenstate vector particle
– g is polarized; either gL and gR
• New Physics (NP) may introduce sizable inteference
– e.g. LR-symmetric models allow Asym ~ S sin(Dmt), S ~ 0.5
October 7, 2004
Masashi Hazumi (KEK)
FPCP2004
58
News from Belle at ICHEP04 in Beijing
• Ksp0 invariant spectrum for B0 g Ksp0g (talk by K.F.Chen)
Nice improvement expected by including
all mass regions.
Cf. present Belle result (hep-ex/0409049)
SK*g = -0.79 +0.63 0.10
-0.50
• 5s observation of B g hKg (hep-ex/0408120)
First observation of
one of (many) useful
decay modes
October 7, 2004
Masashi Hazumi (KEK)
FPCP2004
59
0
B
g
+
ppg
• p+p- is a CP eigenstate (CP-even)
– Therefore C = (-1)J; sign of TCPV depends on J !
• C transformation changes the sign of the Dalitz variable z
– This is another way to understand the J dependence
g(s1,z) = +g(s1,-z) for odd J
= -g(s1,-z) for even J
October 7, 2004
Masashi Hazumi (KEK)
results for B gVg restored
FPCP2004
60