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Measurements of φ 1 and φ 2

Measurements of φ 1 and φ 2. B → K S p 0 p 0 B → K S K S B → K S p 0 B → D *+ D *- B → a 1 p , a 1 K, b 1 p , b 1 K... U (4S) → B CP B CP. Tagir Aushev For the Belle Collaboration (EPFL, Lausanne ITEP, Moscow). CKM matrix & unitary triangle. relative

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Measurements of φ 1 and φ 2

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  1. Tagir Aushev (EPFL, ITEP) Measurements of φ1 and φ2 • B → KS p0 p0 • B → KS KS • B → KSp0 • B → D*+ D*- • B → a1p, a1K, b1p, b1 K... • U(4S) → BCP BCP Tagir Aushev For the Belle Collaboration (EPFL, Lausanne ITEP, Moscow)

  2. Tagir Aushev (EPFL, ITEP) CKM matrix & unitary triangle relative magnitudes

  3. Tagir Aushev (EPFL, ITEP) CP Violationin 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

  4. Tagir Aushev (EPFL, ITEP) TCPV measurement on B-factory B’s are produced in a boosted frame tis measured from vertex positions B’s are entangled flavor of B1 at time t2 is determined by B2 decay

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

  6. Tagir Aushev (EPFL, ITEP) Current luminosities BaBar collected 510 fb-1

  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+D0were 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: -0.13 ± 0.14 ± 0.02 Also an upper limit forBD0D0 : B.R.<0.43·10-4@90%C.L. hep-ex/0802.2988

  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 K0making 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=545 +- 29 Belle Preliminary

  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 = 0.143  0.034  0.008 Belle: R = 0.116  0.042  0.004

  10. Tagir Aushev (EPFL, ITEP) TCPV in B0D*+D*– Belle Preliminary

  11. Tagir Aushev (EPFL, ITEP) s,d q q s,d q q NP SM Searches for a New Physics • Penguin dominated B decays are sensitive to NP + • New Physics may introducesextra CP phasein the decay • Deviation of Time-dependent CP violation parameters from the SM expectationHint of New Physics

  12. Tagir Aushev (EPFL, ITEP) LR>0.9, good tag X SM expectation TCPV in B0 → KS00:bsqq Nsig = 307±32 >2 s from the SM S=-sin2j1 Belle +0.43+/-0.49+/-0.09 BaBar +0.72+/-0.71+/-0.08 Average +0.52+/-0.41 Belle Preliminary A=-C Belle -0.17+/-0.24+/-0.06 BaBar -0.23+/-0.52+/-0.13 Average -0.18+/-0.22 Phys.Rev.D76:071101,2007

  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 +0.33+/-0.35+/-0.08 BaBar +0.40+/-0.23+/-0.03 Belle -0.05+/-0.14+/-0.05 BaBar -0.24+/-0.15+/-0.03 Phys.Rev.D77:012003,2008 A=-C

  14. Tagir Aushev (EPFL, ITEP) ~90o±10o 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

  15. Tagir Aushev (EPFL, ITEP) 608 ± 53 B0→a1(461 ± 53 flav.-tagged) BaBar PRL 98, 181803 (2007) Measurement B  a1 First time-dep CP asymmetry in B → a1+ Belle Preliminary

  16. Tagir Aushev (EPFL, ITEP) B→r0r0 Latest result from Belle:

  17. Tagir Aushev (EPFL, ITEP) B decays to light mesons PRL 99:261801, 2007 PRL 100:051803, 2008 PRL 99:241803, 2007 No charge asym’s found

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

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

  20. Tagir Aushev (EPFL, ITEP) +3.6 Nsig=-1.5 -2.8 events 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 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

  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

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