cp violation measurements at b factories – present and future –
DESCRIPTION
Present CKM angles New CP -violating phase Future: Super e + e - B factories. CP Violation Measurements at B Factories – present and future –. Masashi Hazumi (KEK) June 22, 2004 SUSY04, Tsukuba, Japan. - PowerPoint PPT PresentationTRANSCRIPT
CP Violation Measurements at CP Violation Measurements at BB Factories – present and future – Factories – present and future –
Masashi Hazumi (KEK)
June 22, 2004SUSY04, Tsukuba, Japan
• Present– CKM angles
– New CP-violating phase
• Future: – Super e+e B factories
June 17-23, 2004 SUSY04, Tsukuba, Japan Masashi Hazumi (KEK) 3
Time-dependent Time-dependent CPCP violation violation“double-slit experiment” with particles and antiparticles“double-slit experiment” with particles and antiparticles
(Bigi-Carter-Sanda 1981) Large O(1) CP violation Very small hadronic uncertainty (~1% or less) !
b c
d
csd
J/KS
b
d cJ/KS
bcsddt
t
+
Quantum interference between two diagrams
June 17-23, 2004 SUSY04, Tsukuba, Japan Masashi Hazumi (KEK) 4
Time-dependent Time-dependent CPCP violation violation“double-slit experiment” with particles and antiparticles“double-slit experiment” with particles and antiparticles
CP
(Bigi-Carter-Sanda 1981) Large O(1) CP violation Very small hadronic uncertainty (~1% or less) !
June 17-23, 2004 SUSY04, Tsukuba, Japan Masashi Hazumi (KEK) 5
Measurement PrincipleMeasurement Principle
high-luminosity e+e collider with asymmetric beam energy (~108 B mesons) precise position measurement of B-meson decay vertices (z resolution~100m)
seemingly a crazy idea in 1980s 2 B factories (KEK, SLAC) in operation since 1999
e e+e: 8.0 GeV e+: 3.5 GeV
BCP
z
Btag
(4S) ~ 0.425
CP eigenstateCP eigenstate
z cB ~ 200 m
Flavor tagFlavor tag tz
c
10.58GeV/c2
(9.1/3.0 GeV at PEPII/BaBar)
O(1)ps
June 17-23, 2004 SUSY04, Tsukuba, Japan Masashi Hazumi (KEK) 6
History ofHistory ofLuminosity FrontierLuminosity Frontier
June 17-23, 2004 SUSY04, Tsukuba, Japan Masashi Hazumi (KEK) 7
11: Time-dependent : Time-dependent CPCP violation in violation in BB00 JJ// KKs etc.s etc.
June 17-23, 2004 SUSY04, Tsukuba, Japan Masashi Hazumi (KEK) 8
sin2sin211 history history
sin21
7%precision
June 17-23, 2004 SUSY04, Tsukuba, Japan Masashi Hazumi (KEK) 9
BB factories studying top quarks factories studying top quarks
Top-quark physics Direct production, Mass, width etc. CDF/D0Off-diagonal couplings, phase BaBar/Belle
tbtstd
cbcscd
ubusud
CKM
VVV
VVV
VVV
V
June 17-23, 2004 SUSY04, Tsukuba, Japan Masashi Hazumi (KEK) 10
1()
(0,0)(0,1)
_ _(, )
3()
2()
B0 J/ KS(L), (2S) KS,
c1 KS, c KS
B0 +b ul with several approaches(excl. & incl.) _
BB mixing (md)
B D(*)l
B DCPK
B D(*)
B0
Unitarity Triangle determination at BaUnitarity Triangle determination at BaBar & BelleBar & Belle
B0
B D(Ks)
June 17-23, 2004 SUSY04, Tsukuba, Japan Masashi Hazumi (KEK) 11
)]}Δcos()Δsin([1{4
);(0
0|
0 tmtmτ
etfB dd
B
/τt|
CP
B
ASP
)]}Δcos()Δsin([1{4
);(0
0|0
tmtmτ
etfB dd
B
/τt|
CP
B
ASP
C A is also used
(S, A) = (0.8, 0.0)
(S, A) = (0.8, 0.6)
Decay rate with direct Decay rate with direct CPCP violation violation
B0 + :direct CP violation may be large
)0;()0;(
)0;()0;(00
00
tBtB
tBtB
A
+
June 17-23, 2004 SUSY04, Tsukuba, Japan Masashi Hazumi (KEK) 12
S
A
BB00 ++ : Significance of : Significance of CPCP violation violation 140fb1
Feldman-Cousins Analysis
(5.21) Observation of CP violation
hep-ex/0401029,
accepted by PRL
3.2 for A=0 and any S
2) Evidence for direct CP violation
June 17-23, 2004 SUSY04, Tsukuba, Japan Masashi Hazumi (KEK) 13
Constraint on Constraint on 22 and and Belle140fb1
90 ≤ 2 ≤ 146 (95.5% CL)
2 (
deg.
) (deg.)
CL=0.683 (1)
CL=0.955 (2)
CL=0.9973 (3)
sin21 = 0.736
(deg.)
2 (deg.)
|P|/(|T|+|P|)
95.5% C.L. volume|P/T| = 0.45 (more stringent bound for |P/T|<0.45)
June 17-23, 2004 SUSY04, Tsukuba, Japan Masashi Hazumi (KEK) 14
BB00
SlongClong
• Larger branching fraction than – (30 4 5) 106
• Small penguin pollution• 3 helicity states
– mixture of CP even and odd– Longitudinal fraction = 0.990.03
• Constraints on with isospin analysis– interference, non-resonant contributions, I=1
amplitudes neglected– Main systematics: CPV in B backgrounds
Preliminary
2 region for
June 17-23, 2004 SUSY04, Tsukuba, Japan Masashi Hazumi (KEK) 15
33 withwith a new method a new method
b
u
u
s
c
u
Vub*
Vcs
B
b
u
u
s
c
u
Vcb*
Vus
B
D0
D 0
K
K
Ks
Ks
B+:
B-:
Dalitz analysis with BD0[Ks+-] K
interference
m+=m(Ks+), m=m(Ks) CPV: Asymmetry in Dalitz dist.:
r
r
A1
A2
|A2|
|A1|r =
Giri, Grossman, Soffer, Zupan, PRD68, 054018 (2003)
June 17-23, 2004 SUSY04, Tsukuba, Japan Masashi Hazumi (KEK) 16
Dalitz analysis with Dalitz analysis with BB DD(( Ks Ks) K) K(*)(*)
73 events
M2(Ks) [GeV2 ]
M2 (
Ks
) [G
eV2 ]
B+
K*+
73 events
M2(Ks) [GeV2 ]
M2 (
Ks
) [
GeV
2 ]
B
K*
Fit to Dalitz distr. obtain , r
B DK
Most powerful method now !!
BB++ D D00KK++ && D* D*00KK++ combinedcombined
φ3=77 (stat) 13(syst) 11(model)
[26 <φ3 < 126 (95.5% CL)]
+1719
Preliminary
B DK
June 17-23, 2004 SUSY04, Tsukuba, Japan Masashi Hazumi (KEK) 17
Constraints on Unitarity TriangleConstraints on Unitarity Triangle
2
_
3=95%CL3=95%CL
June 17-23, 2004 SUSY04, Tsukuba, Japan Masashi Hazumi (KEK) 18
One phase to rule them all .. ?One phase to rule them all .. ?
• Beautiful agreements so far!– Triumph of Kobayashi-Maskawa model of CP violation
– More precise measurements needed for 2, 3• At least 1ab1 to do first precise measurements
• Difficulty in Baryogenesis• Many CP-violating phases in physics beyond the SM
b s (3rd 2nd )should be explored !
• Present constraints mainly with transitions between – 3rd 1st generations– 2nd 1st generations
June 17-23, 2004 SUSY04, Tsukuba, Japan Masashi Hazumi (KEK) 19
Search for a new Search for a new CPCP-violating phase-violating phase
June 17-23, 2004 SUSY04, Tsukuba, Japan Masashi Hazumi (KEK) 20
__Hint of new physics ?: CPV in Hint of new physics ?: CPV in bbssssss
CP violation “same” as J/Kswithin the Standard ModelPenguin~O(2), Tree~O(4)deviation = O(1)%
Breakthrough to New Physics with loop (penguin) diagrams
Penguin diagram
virtual particle (top quark, and more ?)
Estimations on hadronic uncertaintiesGrossman, 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 !)
June 17-23, 2004 SUSY04, Tsukuba, Japan Masashi Hazumi (KEK) 21
More b More b s penguin anomalies s penguin anomalies
• Polarization in BVV decays
• Relations among BK branching fractions– Talk by A. Buras
• Large B ’Xs branching fraction
0
1O( )1
m2
≠0.43±0.10 (Belle, K*0)0.65±0.07 (BaBar, K*0)0.46±0.12 (BaBar, K*)0.95±0.11 (Belle, 0)0.96±0.16 (BaBar, 0K*)0.97±0.08 (BaBar, 0)
June 17-23, 2004 SUSY04, Tsukuba, Japan Masashi Hazumi (KEK) 22
BB00 Ks, KKs, K++KKKs, Ks, ’Ks’Ks Fit sin21
B0 KS B0 KKKS B0 ’KS
fS
A
09.011.050.096.0
07.029.015.0
18.000.005.026.051.0
04.016.017.0
05.027.043.0
04.016.001.0
[PRL 91, 261602 (2003)]
“sin21” 3.5 away from SM !
June 17-23, 2004 SUSY04, Tsukuba, Japan Masashi Hazumi (KEK) 23
BB00 ’Ks, K’Ks, K++KKKs, fKs, fKs, Ks,
B0 K+KKs [hep-ex/0406005]
B0 f0(980)[]Ks
B0 ’Ks (81fb1)[PRL91, 161801 (2003)]
Sf0KsCf0Ks
+0.560.51
3rd error from quasi two-body approximation
SKKKsCKKKsCP-even fraction = 0.98 0.15 0.04
[hep-ex/0406040]
S’KsC’Ks
Preliminary
Preliminary
June 17-23, 2004 SUSY04, Tsukuba, Japan Masashi Hazumi (KEK) 24
BB00 KKSS and and KKLL
SK0CK0
Signal yields are for all regions,histograms are for signal-enhanced regions.
+0.080.06
Preliminary
June 17-23, 2004 SUSY04, Tsukuba, Japan Masashi Hazumi (KEK) 25
Vertexing for BVertexing for B00 Ks Ks00, Ks, Ks00
Reconstruct B Ks 0() vertex using Ks trajectory and boost trajectory
Ks
+
-
0B
0B
0
e+e-
boosted (4s)
z
June 17-23, 2004 SUSY04, Tsukuba, Japan Masashi Hazumi (KEK) 26
B decay vertex with KsB decay vertex with Ks
B0 K*0( Ks0) [hep-ex/0405082]
SK*0CK*0
113fb1
B0 Ks0 [hep-ex/0403001]
SKsCKs
+0.380.47+0.270.38
events(68% w/ vtx)
Preliminary
Preliminary
June 17-23, 2004 SUSY04, Tsukuba, Japan Masashi Hazumi (KEK) 27
b b s vs. b s vs. b c c
PDG2004
“SM” precision meas.
K0: Av = 0.14±0.33 (2.6 away from SM)
[Belle/Babar 2.3 away]
All b s (2.4 away from SM)
June 17-23, 2004 SUSY04, Tsukuba, Japan Masashi Hazumi (KEK) 28
SSKsKs history history
?
New results coming soon !Stay tuned.
BaBar
Belle
Standard Model
June 17-23, 2004 SUSY04, Tsukuba, Japan Masashi Hazumi (KEK) 29
Integrated luminosity nowIntegrated luminosity now
KEKB/Belle> 100 fb-1 this year (~6 months) !
PEPII/BaBar
June 17-23, 2004 SUSY04, Tsukuba, Japan Masashi Hazumi (KEK) 30
Integrated luminosity in the near futureIntegrated luminosity in the near future
Oide’s scenario for KEKB Seeman’s scenario for PEPII• April 2004: 2.3A x 1.4 A y*=11 mm 1555
bunches L=8.4E33• July 2004: 2.5A x 1.6 A y*=10 mm 1600
bunches L=10E33• June 2005: 3.3A x 1.8 A y*=9 mm 1700
bunches L=15E33• July 2006: 3.9A x 2.0 A y*=8 mm 1715
bunches L=20E33• July 2007: 4.5A x 2.2 A y*=8 mm 1715
bunches L=24E33• With good integration reliability and trickle
injection:• 100 fb-1 more integrated by Summer 2004.• 500 fb-1 total integrated by Fall 2006.• About 1.0 to 1.3 ab-1 integrated by Fall 2009.
June 17-23, 2004 SUSY04, Tsukuba, Japan Masashi Hazumi (KEK) 31
Super eSuper e++ee BB factories factories
June 17-23, 2004 SUSY04, Tsukuba, Japan Masashi Hazumi (KEK) 32
Major upgrade plansMajor upgrade plans
SuperKEKB SuperBaBar
Peak lumi.
(cm-2s-1)
5 x 1035 1 x 1036
upgrade in ~2008 > 2010
Status LoI (Feb.04) ~530pages !!
LoI 1 year from now ?
KEK SLAC
http://belle.kek.jp/superb/loi/physics part to be submitted to hep-ex soon
June 17-23, 2004 SUSY04, Tsukuba, Japan Masashi Hazumi (KEK) 33
Present situation: lucky for Super Present situation: lucky for Super BB factory ! factory !
• We know that– Standard Model (incl. Kobayashi-Maskawa mechanism) is the effective low ene
rgy description of Nature.
– However most likely New Physics lies in O(1) TeV region.• LHC will start within a few years and (hopefully) discover new elementary particles.
– Flavor-Changing-Neutral-Currents (FCNC) suppressed• New Physics w/o suppression mechanism excluded up to 103 TeV. New Physics
Flavor Problem
• Different mechanism different flavor structure in B decays (tau, charm as well)
Comprehensive studies of B decays with the luminosity upgrade will be quite effective and essential.
June 17-23, 2004 SUSY04, Tsukuba, Japan Masashi Hazumi (KEK) 34
BB00 ( (cccc))KKs vs. s vs. KKss
2716 signals
6811 signals
1999-2003 data set (158fb-1) in 1 week
L=5 1035 cm2s1
June 17-23, 2004 SUSY04, Tsukuba, Japan Masashi Hazumi (KEK) 35
One Snowmass year operation (5 abOne Snowmass year operation (5 ab-1-1))
J/Ks
KsS[Ks]input = +0.24
S Sf – SJ/Ks
[~ O(2) in SM]
SuperKEKB LoI
June 17-23, 2004 SUSY04, Tsukuba, Japan Masashi Hazumi (KEK) 36
3-body 3-body CPCP eigenstateseigenstatesT. Gershon and M. Hazumi, hep-ph/0402097
X0
P0
0 Ks KL ’ f0 a0
0 000 00Ks 00KL 00 00’ 00 f0 00a0
Ks KsKs0 KsKsKs KsKsKL KsKs KsKs’ KsKsf0 KsKsa0
KL KLKL0 KLKLKs KLKLKL KLKL KLKL’ KLKLf0 KLKLa0
0 Ks KL ’ f0 a0
’ ’’0 ’’Ks ’’KL ’’ ’’ ’ ’’f0 ’’a0
f0 f0f00 f0f0Ks f0f0KL f0f0 f0f0’ f0f0f0 f0f0a0
a0 a0a0 a0a0Ks a0a0KL a0a0 a0a0’ a0a0 f0 a0a0a0
• Any final state with 3 spin-0 CP-eigenstate neutral particles is a CP eigenstate.• Many modes are available.• B0 KsKsKs most promising
– branching ratio already observed (Belle 78fb-1)– Pure b sss– Small background
June 17-23, 2004 SUSY04, Tsukuba, Japan Masashi Hazumi (KEK) 37
BB KK : ultra-clean mode: ultra-clean modeM. Hazumi, PLB583, 285 (2004)
Belle 78 fb-1 (7 events)PRL91, 241802 (2003)
• Interference between B c( )K and 3-body b s process
• CP violation in the SM ~0, can be ~0.4 if new physics enters b s• Ultra-clean mode to reconstruct, almost no background
Sensitivity to new phase: K vs. Ks
June 17-23, 2004 SUSY04, Tsukuba, Japan Masashi Hazumi (KEK) 38
Distinguish different new physics models !Distinguish different new physics models !
Different SUSY breaking scenarios can be distinguished !
T. Goto, Y.Okada, Y.Shimizu,T.Shindou, M.Tanaka, hep-ph/0306093+ SuperKEKB LoI
June 17-23, 2004 SUSY04, Tsukuba, Japan Masashi Hazumi (KEK) 39
More tests of SUSY breaking scenariosMore tests of SUSY breaking scenariosSuperKEKB LoI
• S(Ks)• S(K*)• Br(b s)• A(b s)
• AFB(b sll)
• Br( )
50ab-1
“DNA identification”of new physics
June 17-23, 2004 SUSY04, Tsukuba, Japan Masashi Hazumi (KEK) 40
CKM Unitarity Triangle (in)consistencyCKM Unitarity Triangle (in)consistency
5 ab1Two cases at
June 17-23, 2004 SUSY04, Tsukuba, Japan Masashi Hazumi (KEK) 41
CKM Unitarity Triangle (in)consistencyCKM Unitarity Triangle (in)consistency
50 ab1Two cases at
June 17-23, 2004 SUSY04, Tsukuba, Japan Masashi Hazumi (KEK) 42
•B → D
(BD)/(BD)at B factory with50 ab-1
““B-meson beam” with full reconstructionB-meson beam” with full reconstruction
Υ(4S)e- (8GeV) e+(3.5Gev)
B
B
Interesting decays•B → ul•B → •B → D•etc
full tagging
Unique at (4S)Need large statistics
0.2~1% for B+
(efficiency dependson purity).
June 17-23, 2004 SUSY04, Tsukuba, Japan Masashi Hazumi (KEK) 43
Summary of physics reachSummary of physics reach
June 17-23, 2004 SUSY04, Tsukuba, Japan Masashi Hazumi (KEK) 44
Summary of Summary of BB physics at present physics at present
• BaBar/PEPII and Belle/KEKB doing extremely good
• sin21 now measured with 7% accuracy
• CP violatioin in B0 observed
• First constraint on 3
• Tantalizing hint of new physics in b s CP asymmetries… and many more new observations for tomorrow ! (recall it is just a few years from the first obs. of B0 Ks
New ideas for measurements proposed constantly !
June 17-23, 2004 SUSY04, Tsukuba, Japan Masashi Hazumi (KEK) 45
Summary for the future Summary for the future BB physics physics
• ~1ab-1 by ~2007: Exciting time will continue !– 2, 3 measurements first precise tests of the triangle
– Observation of direct CP violation (B0 , K+, etc.)
– (with luck) Observation of a new CP-violating phase
• Super B factory in the LHC era– play a key role to elucidate the new physics flavor problem.
– LHC results will serve as important inputs (similar to Tevatron)
June 17-23, 2004 SUSY04, Tsukuba, Japan Masashi Hazumi (KEK) 46
SUSY2014 ?SUSY2014 ?
Yankee Stadium
June 17-23, 2004 SUSY04, Tsukuba, Japan Masashi Hazumi (KEK) 47
Backup SlidesBackup Slides
June 17-23, 2004 SUSY04, Tsukuba, Japan Masashi Hazumi (KEK) 48
Measurement PrincipleMeasurement Principle
~1 ps
June 17-23, 2004 SUSY04, Tsukuba, Japan Masashi Hazumi (KEK) 49
CPCP violation in violation in BB00
A = +0.58 0.15(stat) 0.07(syst)S = 1.00 0.21(stat) 0.07(syst)
0.86 < LR 1.0
140fb1
hep-ex/0401029,
accepted by PRL
June 17-23, 2004 SUSY04, Tsukuba, Japan Masashi Hazumi (KEK) 50
S
A
BB00 ++ : Significance of : Significance of CPCP violation violationBelle140fb1
Feldman-Cousins Analysis
(5.21) Observation of CP violation
3.2 for A=0 and any S
2) Evidence for direct CP violation
3.3 for “superweak” case
June 17-23, 2004 SUSY04, Tsukuba, Japan Masashi Hazumi (KEK) 51
History of History of AA and and SS
Belle
BaBar
Difference at 2.2 level
BaBar/Belle average
A= 0.46 0.13
June 17-23, 2004 SUSY04, Tsukuba, Japan Masashi Hazumi (KEK) 52
BB00 Ks, KKs, K++KKKs, Ks, ’Ks’Ks B0→KS
KK
B0→KKKS
(KK)
B0→’KS
Nsig(KS)=68(64%)
Nsig(KKKS)=
Nsig(’KS)=244(58%)
CP=even 103 16%
∫L dt = 140 fb-1
106 ev
361 ev
421 ev
199(55%)
[PRL 91, 261602 (2003)]
June 17-23, 2004 SUSY04, Tsukuba, Japan Masashi Hazumi (KEK) 53
““B-meson beam” with full reconstructionB-meson beam” with full reconstruction
5 ab1 50 ab1
Observation of B+ D Observation of B+ K
12 5
June 17-23, 2004 SUSY04, Tsukuba, Japan Masashi Hazumi (KEK) 54
Doable with mass spectrum ?Doable with mass spectrum ?
Very hard to distinguish different SUSY breaking scenarios from mass spectrum alone (at LHC)
quite similar
June 17-23, 2004 SUSY04, Tsukuba, Japan Masashi Hazumi (KEK) 55
MissionMission
• Test of Kobayashi-Maskawa model of CP violation– Time-dependent CP violation
– Unitarity Triangle determination
– Direct CP violation
• Study rare B decays to find a hint of new physics– “Penguin” decays
• Many other topics– new resonances
– charm physics
– tau physics