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Experimental review of ADS and GLW methods

Experimental review of ADS and GLW methods. Pavel Krokovny KEK. Introduction Apparatus Methods Results Summary. Unitarity triangle. Using unitarity requirement :. sin2 φ 1 (β) is measured with a good accuracy at B-factories . Measurement of all the angles needed to test SM.

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Experimental review of ADS and GLW methods

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  1. Experimental review of ADS and GLW methods Pavel Krokovny KEK Introduction Apparatus Methods Results Summary

  2. Unitarity triangle Using unitarity requirement: sin2φ1(β) is measured with a goodaccuracy atB-factories. Measurement of all the angles needed to testSM.

  3. B+ D0K+ decay Need to use the decay whereVubcontribution interferes with another weak vertex. B– D0K–:B– D0K–: If D0 and D0decay into the same final state, Relative phase: (B– DK–), (B+ DK+) includesweak (γ/φ3) and strong (δ) phase. Amplitude ratio:

  4. 4 equations (3 independent: ), 3 unknowns Gronau-London-Wyler method [Phys. Lett. B 253 (1991) 483] [Phys. Lett. B 265 (1991) 172] СР eigenstateofD-meson is used (DCP). CP-even : D1K+K–, π+ π– CP-odd : D2 KS π0, KS ω, KS φ, KSη… СР-asymmetry: forD1  A1,2of different signs forD2 Additional constraint:

  5. GLW method (Belle)

  6. GLW method (Belle) B± DK± decay: Belle results (253 fb-1) hep-ex/0601032 B+ D1K+ B- D1K- B± D*K±, D*Dπ0 decay: B+ D2K+ B- D2K- GLW analyses alone do not constrain γ/φ3 significantly yet, but can be combined with other measurements and provide information on rB

  7. GLW method (BaBar) BaBar results (211 fb-1) Phys.Rev. D73, 051105 , Phys.Rev. D72, 071103 B± DK± decay: rB2=-0.12±0.08(stat)±0.03(syst) B± DK*±, K*±KSπ±decay: rB2=0.30±0.25

  8. Atwood-Dunietz-Soni method D. Atwood, I. Dunietz and A. Soni, PRL 78, 3357 (1997); PRD 63, 036005 (2001) Enhancement of СР-violationdue to use ofCabibbo-suppressedD decays B–D0K–- color allowed D0K+π– - doublyCabibbo-suppressed B–D0K–- color suppressed D0K+π– - Cabibbo-allowed Interfering amplitudes are comparable 

  9. B+ -> D0[K-p+] p+ Peaking background from B+ -> K+p- p+decay. Using D sidebands to subtract it. After subtraction the signal yield is events ADS method (Belle) B+ -> D0[K+p-] p+

  10. ADS method (Belle) Belle results (357 fb-1) hep-ex/0508048 Suppressed channel not visible yet: UsingrD=0.060±0.003, for maximum mixing (φ3=0, δ=180°): rB<0.18 (90% CL)

  11. ADS method (BaBar) B→ D*0K (D*0 →D0p0) B→ D*0K(D*0→D0g) B→ D0K PRD 72 (2005) 071104 Suppressed channel not visible Bondar & Gershon PRD70,091503(2004) rB<0.23 (90% CL) for BDK rB<0.16 for BD*K

  12. Constraints on rB (BaBar) 48o<g<73o GLW ADS combination For maximum mixing (g/φ3=0, δ=180°): rB<0.23@ 90% C.L. rB= D0 K D0K*+ DK*, GLW+ADS g[0,p]&(dD+dB)[0,2p] 1-CL 1s 2s 3s rB

  13. ADS method (BaBar) B->D[K+p-p0] Khep-ex/0607065 (ICHEP 06)

  14. ADS method (BaBar) B->D[K+p-p0] K hep-ex/0607065 (ICHEP 06) rDK<0.039 (95% CL) rB<0.185 (95% CL)

  15. Summary • The statistics is not enough for measure the φ3/g using ADS and GLW methods • However these approaches can provide constrain for rB and can be used combined with Dalitz analysis method • There are perspectives for improving the result with larger data set

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