Transcript Recent Result at Belle - University of California, San Diego

Summary
of
Present Experimental Results
• CKM: f1(& b s), f2, f3,...
• Decays with Missing Energy
• b  d (s) Penguin
• etc.
Based on ICHEP06 results (highlights)
13-Sep-2006,
Y.Sakai (KEK)
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Integrated Luminosity
Integrated Luminosity (fb-1)
KEKB + PEP-II
KEKB
for Belle
reached on July 13, 2006
~ 1 Billion BB pairs
PEP-II
for BaBar
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2
sin2f1 & b g s Penguin tCPV
b
d
c J/
c
s
d KS
b
X
d
Belle : updated ~all modes with
BaBar: updated ~all modes with
s
s
s
d
f
KS
535M BB
_
347M BB
Improved analyses, more sub-decay modes, ..
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3
sin2f1 : b g ccs
_
535M BB
BJ/Ks
_
347M BB
_
(cc)K(*)0
B
_ 0 tag
B0 tag
BJ/KL
[hep-ex/0608039]
[hep-ex/0607107]
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sin2f1 : 2006 BaBar + Belle
0.674  0.026
< 4 % error : Precise measurement !
Av. C = -A = 0.012  0.022
Firm Reference Point for NP search
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5
cos2f1 : Solve ambiguity
[hep-ex/0608016]
B0gD*+D*-Ks
Time-dependent Dalitz analysis
(T.Browder, A. Datta et al. 2000)
 cos2b > 0
(94%CL, model-dependent)
B0gDh0 (h0 = p0 etc.)
Time-dependent Dalitz analysis
 cos2b > 0
Belle: 98.3%CL
[PRL 97,081801(06)]
BaBar 87% CL
[hep-ex/0607105]
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“Golden” mode: h’K0
h’K0
1st observation
b  s mode tCPV
h’Ks
h’KL
unbinned fit
SM
535M BB
5.6s
“sin2f1” = +0.64  0.10  0.04
A
= +0.01  0.07  0.05
[hep-ex/0608039]
_
347M BB
4.9s
“sin2f1” = +0.55  0.11  0.02
A
= +0.15  0.07  0.03
[hep-ex/0607100]
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“Golden” mode:
B0 g K+K-K0 Dalitz tCPV
0
fK
• Obtain CP parameters for 2-body and 3-body modes
simultaneously by time-dependent Dalitz fit
K+K-KSgp+pK+K-KSgp0p0
K+K-KL
_
347M BB
1516  65
K+K-K0 signal
[hep-ex/0607112]
MK+K-
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fK0 : tCPV in B0 g _K+K-K0
b measurement (not sin2b)
347M BB
[hep-ex/0607112]
Rejected
(within SM)
4.6s
535M BB
+0.50  0.21  0.05
fK0: sin2beff = +0.12 ± 0.31(stat) ± 0.10 (syst)
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2006: f1 with b g s Penguins
Smaller than bgccs
in all of 9 modes
Theory :
tends to
positive
shifts
Naïve average of all b g s modes
sin2beff = 0.52 ± 0.05
2.6 s deviation
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f2 Belle 2006: B0→p+p− decay
(tCPV)
535M BB
1464±65 signal events
p+p− yields
App  +0.55  0.08  0.05
Spp  -0.61 0.10  0.04
first error: stat., second: syst.
p+p− asymmetry
Large Direct CP violation (5.5s)
Large mixing-induced CPV
(5.6s)
background subtracted
[hep-ex/0608035]
confidence
level
contour
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BaBar 2006: tCPV in B0 g p+p_
347M BB
App  +0.16  0.11 0.03
Spp  -0.53  0.14  0.02
Evidence for CP violation (3.6s)
Direct CPV not yet observed
confidence
level
contour
[hep-ex/0607106]
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History of B0→p+p− decay
(C = -A)
2.3s diff.
btw. Belle
and BaBar
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f2 constraints from B0→p+p− decay
inputs
B(p+p0) = (5.75 0.42)
B(p+p-) = (5.20 0.25)  10-6
B(p0p0) = (1.30 0.21)
A(p0p0) = +0.35 0.33
S(p+p-) = -0.59  0.09
A(p+p-) = +0.39  0.07
No stringent constraint
obtained
with pp system alone
 need rr and rp
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f2: B0 rr CPV
Similar to p+p-, but more complicated …
B  VV: not CP eigenstate in general
r+  p+p0: wide resonance
Two lucky cards !
fL ~ 100%  CP  +1
B(r0r0) << B(r+r-), B(r+r0)
< 1.1
30  6
26  6 x10-6 (HFAG)
small Penguin effect (q )
2q
A+-/ 2
A00
A+0
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BaBar2006: tCPV in B g r+rB(B0g r+r-)=(23.5±2.2±4.1)x10-6
_
348M BB
[hep-ex/0607098]
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BaBar2006: B g rr (cont.)
• B0 g r0r0 branching fraction: indication at 3.0s
_
348M BB
[hep-ex/0607097]
• B+ g r+r0 branching fraction
[hep-ex/0607092]
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f2 constraints from B0→r+r− decay
New r0r0 branching fraction
Isospin triangle now closed (new r+r0)
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B0 r+p- tCPV
B0 r+p- : not CP eigenstate, same diagram as p+pMixing CPV with 4 amplitudes (complicated)
[BaBar PRL 91,201802(’03); Belle PRL94,121801(’05)]
B0 p+p-p0 : Dalitz
A(r ip j) = Aij =eif2 T ij + P ij
P00 = -(P+-+P-+)/2
fi (s+, s-) : form factors
(Breit-Wigner)
s-= m(p-p0)2
A3p= f+ A+-+ f- A-++ f0 A00
r+p-
Fit to Dt, Dalitz dist.
 f2 w/o discrete ambiguity !
[Synyder, Quin, PRD48,2139(‘93)]
r+p-
r-p+
s+=m(p+p0)2
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2006: B g (rp)0 Dalitz analysis
26 parameters fit (r+p-, r-p+, r0p0)
_
347M BB
[hep-ex/0608002]
1-CL
449M BB [hep-ex/0609003]
[2004 (16 parameters ignoring r0p0) ]
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f2 from B g rp
Dalitz analysis + isospin (pentagon) analysis
• 26(Dalitz) + 5[Br(rp), Br(r+p0), Br(r0p+), A(r+p0), and A(r0p+)]
1-CL
449M BB
a/f2 =
+12
[83-23]
(1s)
f2 (degrees)
[hep-ex/0609003]
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f2 Summary
a/f2 =
+13
[99- 8 ]
a/f2 =
+11
[93- 9 ]
[Belle rp Dalitz/Isospin not included]
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f3 Measurements
B gDK
1) fCOM = DCP Gronau-Wyler-London [PLB 253,483; 265,172(’91)]
_
D0/D0 p+p-/ K+K- (CP=+1) , KSp0/h/f/w..(CP= -1)
[PRL 91,171801(’03)]
2) fCOM = DDCSD Atwood-Dunietz-Soni
_
ex) B+ D0[K-p+] K+ & D0[K-p+] K+
3) fCOM = D0  KSp+p-
B gD(*)+p/r-
Bondar, GGSZ [PRD 68,054018(’03)]
tCPV Dunietz
[PLB 427, 179(’98)]
RD sin(2f1+f3 ± d)
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[hep-ex/0607104]
2f3
+15
-18
B+
rB
B-
Belle: 53
_
347M BB
 3  9 (386M)
[PRD73,112009(06)]
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Comparison: Belle/BaBar
DK+
2f3
D*K+
B-
B+
rB
B+
B-
contours do not include
Dalitz model errors
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f3 Summary
g/f3 =
+22
[71-30]
New BaBar DK Daliitz
results not included
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UT sides: Vcb , Vub , Vtd
Vcb
Moment analysis: pl, Mx with b  sg
Kinetic ~ 1S scheme
Vub
Inclusive: theoretical framework
BLNP [PRD72:073006 (05)]
DGE [JHEP 0601:097 (06)]
BLL [PRD64:113004 (01)]
Exclusive: new measurements
Form factors (LQCD, Sum rule..)
Vtd /Vts
< 2% precision
~7.5% precision
~4% precision
Tevatron Dms measuremets
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CKM Global Fit
2005 Summer
2006 Summer
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_
Decays w/ “Missing E(>2n)”
B    n
SM :
B decay constant  Lattice QCD
BSM : sensitive to New Physics from H
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B  n : Exp. Challenge
n
n
B-
Y(4S)
B+
_ 2 neutrinos appear
Always >
in B   n decay
Majority : 1 track +invisible
449M BB
N= 680k
eff.= 0.29%
purity = 57%
+
Tag-side: Full reconstruction
B+  D(*)0 + p + / r + / a1+ / DS(*)+
Charged B
D0p 0 / D0g
Ds+g
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B  n : Signal Extraction
EECL : extra neutral energy
Signal +
background
449M BB hep-ex/0604018
submitted to PRL
5  decay modes
Observe 17.2 +4.3
- 5.7 events
significance = 3.5σ
B (B+ +n) =
(1.79  0.56
0.49 
0.39
-4
)
x10
0.46
1st Evidence of B decay
_ 2 n !!
with >
Background
Bn
Signal
Big step for future
in hunting NP
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B  n :BaBar
BF(B++n)
= (0.88 +0.68 0.11) x10-4
-0.67
-4
BR< 1.80 10 @ 90%CL
_
334M BB
Semi-lep tag only
Combined
(1.36  0.48)x10-4

[hep-ex/0608019]
|Vub| = (4.39±0.33)×10-3 (HFAG)
fB = 0.200±0.038 GeV
fB = 0.216±0.022 GeV (HPQCD)
PRL 95, 212001 (2005)
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Constraints on H mass
Use known fB and |Vub |
Ratio to the SM BF.
mB2
rH  (1 - 2 tan 2 b )
mH
excluded
rH=1.130.51
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B  K(*)nn : Motivation
_
b s with 2 neutrinos
SM: B(BK* nn) ~1.3 x 10-5
B (BK nn) ~4 x 10-6
(Buchalla, Hiller, Isidori)
_
_
PRD 63, 014015
DAMA NaI
3s
Region
• New Physics in Loop
• Light Dark Mater (M~1GeV)
No sensitivity in Direct search
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B0  K*0nn : Result
_
Similar exp. technique as B  +n
[hep-ex/0608047]
Full-rec. tag & K + nothing
535M BB
460K tags
+3.1
-2.6
(1.7σ stat. significance)
Yield  4.7
Sideband = 19
MC expectation = 18.73.3
_
cf: BaBar 85M BB
B (B+K+nn ) < 5.2 x 10-5
[PRL 94,101801(05)]
Hope to see Signal in (near?) Future
_
BNM2006
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b d Penguin : b_ dg
[PRL96,221601(06)]
347M BB
386M BB
LP05 5.5s
37.2 signals
Signals
Established !
B+r+g
B0r0g
[hep-ex/0607099]
MES(GeV/c2)
Vtd/Vts
New Physics !
BNM2006
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b d Penguin : B KK
W
Vtb
b
t

Vts/d d
g
d,u
2004/5
K0
s
s K0/+
d,u
Evidence
449M BB
5.3s
37
_
350M BB
Observation !
+9.6
-8.3
5.3s
6.0s
23
+6.5
-5.4
7.3s
MES(GeV/c2)
[hep-ex/0608036]
[hep-ex/0608049]
BNM2006
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b d Penguin : B KSKS tCPV
_
347M BB
[hep-ex/0608036]
BNM2006
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B < 7.9 x 10 -8
at 90% CL for B+
( twice B0)
DE(GeV)
Prediction: few 10-8
B+  p + l +l – and
B0  p 0 l + l l =e or  (and e -  )
DE(GeV)
b d Penguin : B  p l+ l-
MES(GeV/c2)
Rather clean
 Promising in future
MES(GeV/c2)
[209/fb] [hep-ex/0607048]
BNM2006
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b s Penguin : Radiative
Signals: well established (BF~SM)
New approach for NP
B KSp0g tCPV
449M BB
Yield = 176+/- 18
M(Ks p 0)
< 1.8 GeV
_
232M BB
(-C)
[hep-ex/0608017]
BNM2006
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b s Penguin : EW
AFB(K*l+l- ) of l+l-
B
K*
positive AFB
J/
386M BB
’
[PRL 96, 251801(06)]
First Atempt  Important step for future !
BNM2006
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Summary
Belle + BaBar : > 1000 fb-1 data !
• sin2f1:<4% precision; Dsin2f1(b s)<0 ? “2.6s”
• f2, f3: 10~30o, |Vub| ~7.5% ( new measurements)
• First Evidence of B decay with _>2 n
Milestone for Future NP search with 
• b d Penguin: established
explore NP effect
• b d EW Penguin: new approaches for NP
• B hh Puzzles being weakened ...
•  LFV decays: reaching NP era
: (lot more… not shown here)
More data, New ideas for New excitements !
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B  hh
~All BF & ACP : updated at ICHEP06
[227M]
[449M]
[535/449M]
BF: FSR effects are taken into account (PHOTOS,QED)
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Rn & Rc Puzzle
[Buras et al., Eur.Phys.J.C45:701(06)
Rc
Rn
HFAG Rn= (K+p-) /2(K0p0) = 0.99  0.07
Rc= 2(K+p0) /(K0p+) = 1.11  0.07
Puzzle
~ gone
BNM2006
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ACP : K+p- & K+p0
535M BB
B+K+π0
B0K+π0
B
B
K+p-
0
B-
B+
A(K+p-)  A(K+p0)
~4.6s
Sum rule
[Gronau, Rosner 2005]
A(K+p0)+A(K0p0)
= A(K+p-) + A(K0p+)
K+p0
ACP
BNM2006
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LKLK+
Summary of LFV  decays
BNM2006
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BNM2006
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“Golden” mode: fK0
fK0
fgK+KfgKSKL
307  21
fKS signal
New !
unbinned fit
SM
535M BB
“sin2f1” = +0.50  0.21  0.05
A
= +0.07  0.15  0.06
114  17
fKL signal
(bkg subtracted)
BNM2006
48
B0 r+p- Direct CPV
(from Dalitz tCPV analysis)
A- +
Belle
BaBar
A+ BNM2006
49
Comparison: Belle/BaBar
DK+
D*K+
D*K+
contours do not include
Dalitz model errors
BNM2006
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Vcb Inclusive: Global Fit
BNM2006
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Vub Inclusive
BNM2006
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Vub Exclusive
_
227M BB
[B.Kowalski]
BNM2006
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Vub Exclusive: Summary
[B.Kowalski]
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B   n, e  n
_
229M BB
Use hadronic tags: B fully
reconstructed as B to D(*) X
Limits (@ 90% CL)
<7.9 x10-6 for en (SM ~ 10-12)
<6.2 x10-6 for  n (SM ~ 10-7)
[Belle: <
B0
 ll g
2.0x10-6 @140/fb]
Lepton momentum in B frame (GeV/)
[hep-ex/0607110]
_
292M BB
Limits (at 90% CL)
BR(Beeg)< 0.7 x 10-7
BR(Bg)< 3.4 x 10-7
[hep-ex/0607058]
SM predictions of order 10-10
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