1. Tagir Aushev For the Belle Collaboration (EPFL, Lausanne ITEP, Moscow)
Measurements of φ1 and φ2
Tagir Aushev
For the Belle Collaboration
(EPFL, Lausanne
ITEP, Moscow)
B → KS p0 p0
B → KS KS
B → KS p0
B → D*+ D*-
B → a1 p, a1K, b1 p, b1 K...
U(4S) → BCP BCP
Moriond EW, 3 Mar 2008
Tagir Aushev (EPFL, ITEP)

2. CKM matrix & unitary triangle
relative
magnitudes
Moriond EW, 3 Mar 2008
Tagir Aushev (EPFL, ITEP)

3. CP Violation in the Standard Model
Triangle is well measured
φ1(b) mainly from
B0→J/Ψ KS “golden mode”
Smaller and smaller room
for the vertex position,
but it is still in
New decay modes are
examining to find a New
Physics
Moriond EW, 3 Mar 2008
Tagir Aushev (EPFL, ITEP)

4. TCPV measurement on B-factory
B’s are produced in a boosted frame
 t is measured from vertex positions
B’s are entangled
 flavor of B1 at time t2 is determined by B2 decay
Moriond EW, 3 Mar 2008
Tagir Aushev (EPFL, ITEP)

5. Belle & BaBar B-factories
Silicon Vertex Tracker
5-layer, double-sided strips
Drift Chamber
40-layer, small cell
DIRC (PID)
quartz Cherenkov detector
EM Calorimeter
CsI crystals
Flux Return
RPC and LST instrumented iron
1.5 T
Solenoid
8GeV (e-)  3.5GeV (e+)
Moriond EW, 3 Mar 2008
Tagir Aushev (EPFL, ITEP)

6. Tagir Aushev (EPFL, ITEP)
Current luminosities
BaBar collected 510 fb-1
Moriond EW, 3 Mar 2008
Tagir Aushev (EPFL, ITEP)

7. Tagir Aushev (EPFL, ITEP)
BD(0,+)D0
After evidence for DCPV in BD-D+ recently shown by Belle all BDD decays has a special interest
B.R. and charge asym for BD+D0 were updated by Belle:
B.R. = (3.85 ± 0.31 ± 0.38)·10-4
BaBar’06: (3.8 ± 0.6 ± 0.5)·10-4
A = 0.00 ± 0.08 ± 0.02
BaBar’06: ± 0.14 ± 0.02
Also an upper limit for BD0D0 :
hep-ex/
Moriond EW, 3 Mar 2008
Tagir Aushev (EPFL, ITEP)

8. Tagir Aushev (EPFL, ITEP)
TCPV in B0D*+D*–
B0D*+D*– is b ccd transition and so sensitive to sin2j1 just like the “Golden” B0cc K0 making it an important check
Series of papers were published by Belle and BaBar
Recently the results are updated with latest statistics
Belle result is the first time presented
Phys.Rev.D76:111102,2007 N=
Belle Preliminary
Moriond EW, 3 Mar 2008
Tagir Aushev (EPFL, ITEP)

9. Tagir Aushev (EPFL, ITEP)
Helicity of B0D*+D*–
Since it is a decay of S  VV CP-eigenstate depends on angular momentum of the VV system:
Separating the CP-odd fraction,
R, is done via a 1D angular
analysis
Belle Preliminary
BaBar: R =   0.008
Belle: R =   0.004
Moriond EW, 3 Mar 2008
Tagir Aushev (EPFL, ITEP)

10. Tagir Aushev (EPFL, ITEP)
TCPV in B0D*+D*–
Belle Preliminary
S=-sin2j1
A=-C
BaBar
-0.66 ± 0.19 ± 0.04
+0.02 ± 0.11 ± 0.02
Belle
-0.93 ± 0.24 ± 0.15
+0.16 ± 0.13 ± 0.02
Moriond EW, 3 Mar 2008
Tagir Aushev (EPFL, ITEP)

11. Searches for a New Physics
Penguin dominated B decays are sensitive to NP NP
s,d q SM
s,d q +
New Physics may introduces extra CP phase in the decay
Deviation of Time-dependent CP violation parameters from the SM expectation  Hint of New Physics
Moriond EW, 3 Mar 2008
Tagir Aushev (EPFL, ITEP)

12. Tagir Aushev (EPFL, ITEP)
TCPV in B0 → KS00 :bsqq
Nsig = 307±32 X
SM expectation
LR>0.9, good tag
>2 s from the SM
S=-sin2j1
Belle /-0.49+/-0.09
BaBar /-0.71+/-0.08
Average /-0.41
Belle Preliminary
A=-C
Belle /-0.24+/-0.06
BaBar /-0.52+/-0.13
Average /-0.22
Phys.Rev.D76:071101,2007
Moriond EW, 3 Mar 2008
Tagir Aushev (EPFL, ITEP)

13. Tagir Aushev (EPFL, ITEP)
TCPV in B0→KS π0
Nsig = 459 ± 29
B.R.= (10.3±0.7±0.6)·10-6
S=sin2j1
Phys.Rev.D76:091103,2007
Belle /-0.35+/-0.08
BaBar /-0.23+/-0.03
Belle /-0.14+/-0.05
BaBar /-0.15+/-0.03
Phys.Rev.D77:012003,2008
A=-C
Moriond EW, 3 Mar 2008
Tagir Aushev (EPFL, ITEP)

14. Tagir Aushev (EPFL, ITEP)
Measurements of φ2
j2(a) was measured in pp, rp and rr systems
The same matrix elements are also involved to the B decays to axial vectors a1, b1 …
Some of them can be used only with much larger statistics
~90o±10o
Moriond EW, 3 Mar 2008
Tagir Aushev (EPFL, ITEP)

15. Measurement B  a1 Belle Preliminary
First time-dep CP asymmetry in B → a1+
PRL 98, (2007)
BaBar
608 ± 53 B0→a1 (461 ± 53 flav.-tagged)
Belle Preliminary
Moriond EW, 3 Mar 2008
Tagir Aushev (EPFL, ITEP)

16. Tagir Aushev (EPFL, ITEP)
B→r0r0
Latest result from Belle:
Moriond EW, 3 Mar 2008
Tagir Aushev (EPFL, ITEP)

17. B decays to light mesons
B→b10π+: (6.7±1.7±1.0)·10-6
B→a10π+: (20.4±4.7±3.4)·10-6
B→b10K+: (9.1±1.7±1.0)·10-6
B→a1+K0: (34.9±5.0±4.4)·10-6
B→b1-π+: (10.9±1.2±0.9)·10-6
B→a1-π0: (13.2±2.7±2.1)·10-6
B→b1-K+: (7.4±1.0±1.0)·10-6
B→a1-K+: (16.3±2.9±2.3)·10-6
PRL 99:261801, 2007
PRL 100:051803, 2008
PRL 99:241803, 2007
No charge asym’s found
Moriond EW, 3 Mar 2008
Tagir Aushev (EPFL, ITEP)

18. CP Violating Decays of the(4S)
J/KS
11
21
CP1
CP1
J/KL
11
21
Y(4S)
CKS
C1KS
(2S)KS B0 _
CP violation !!
Moriond EW, 3 Mar 2008
Tagir Aushev (EPFL, ITEP)

19. Partial reconstruction
Full reconstruction + - KS
J/ + -
J/c
Signal MC
J/(ll)KS
J/(any)KS
Y(4S) _ B0
About 40 times higher eff. than full reconstruction method
1.1(0.6) inclusive-J/(c) events in 535 million Y(4S) decays
Moriond EW, 3 Mar 2008
Tagir Aushev (EPFL, ITEP)

20. Results with 535M Y(4S) decays
Control sample
B D(*)- and D*-
B0 c KS and J/ KS
Nsig=35 ±16 events
B0 J/ KS
B0 J/(c) KS
Nsig= events
+3.6
With 30 billion Y(4S) (30ab-1),
such decays will be observed
with 5 significance
Br(Y(4S)B0B0J/KS+J/(c)KS)  4x107 (90%C.L.)
SM prediction : 1.4x10-7
Moriond EW, 3 Mar 2008
Tagir Aushev (EPFL, ITEP)

21. Tagir Aushev (EPFL, ITEP)
Summary
CP violations was measured in various B decays
Both mixing-induced & direct CPV observed
Excellent agreement with Standard Model
Small room for New Physics remains in flavour sector
Next order of the statistics is needed to give an answer for the New Physics existence
Moriond EW, 3 Mar 2008
Tagir Aushev (EPFL, ITEP)