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Recent Results on Flavor Physics from Belle Collaboration

Explore latest findings on heavy flavor physics, Unitarity Triangle, Time Dependent CP Violation, and new physics in B decays from Belle experiments at KEKB collider, providing a rich playground for frontier research.

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Recent Results on Flavor Physics from Belle Collaboration

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  1. Recent Results on Flavor Physics from Belle Akimasa Ishikawa on behalf of the Belle Collaboration (Tohoku University) Fourth Workshop on Theory, Phenomenology and Experiments in Flavour Physics

  2. Belle detector KEKB Belle and KEKB • KEKB • The World Highest Luminosity Collider • L = 2.1 * 1034 /cm2/sec • Asymmetric energy to boost B mesons • 8.0GeV e- × 3.5GeV e+ • Belle • designed to measure time dependent CPV • also multi-purpose 4p detector for other physics Fourth Workshop on Theory, Phenomenology and Experiments in Flavour Physics

  3. Integrated Luminosity • Belle has accumulated the world largest integrated luminosity of > 1ab-1! • ~0.77 Billion B meson pairs on Y(4S) • ~1.3 Billion charm pairs • ~0.9 Billion t pairs •  very good playground for heavy flavor physics! Fourth Workshop on Theory, Phenomenology and Experiments in Flavour Physics

  4. Disclaimer • Only recent results are shown so there are many important/your favorite analyses I cannot cover. Fourth Workshop on Theory, Phenomenology and Experiments in Flavour Physics

  5. B Physics Fourth Workshop on Theory, Phenomenology and Experiments in Flavour Physics

  6. Unitarity Triangle Fourth Workshop on Theory, Phenomenology and Experiments in Flavour Physics

  7. Time Dependent CPV • Time dependent CPV arises from interference of mixing and decay. • Final states should be accessible from both B0 and B0bar • In the SM • B0 (cc)K0 : S = - xCP sin2f1 , A = 0 • B0  p+ p - : S = sin2f2 (if tree only) Fourth Workshop on Theory, Phenomenology and Experiments in Flavour Physics

  8. 772 M BB PRL 108, 171802 (2012) B(cc)K0 samples for Final sin2f1 CP-even CP-odd Fourth Workshop on Theory, Phenomenology and Experiments in Flavour Physics

  9. Final sin 2f1 in B(cc)K0 sin2φ1 = 0.667 ± 0.023 ± 0.012 A= 0.006 ± 0.016 ± 0.012 _ B0 tagged B0 tagged Still statistically dominated  Belle II Most precise measurement! sin2φ1 = 0.642 ± 0.031 ± 0.017 A= 0.018 ± 0.021 ± 0.014 previous analysis CP-odd CP-even Fourth Workshop on Theory, Phenomenology and Experiments in Flavour Physics

  10. 772 M BB sin2f1 in BD+D- • SM predicts S = sin2f1 and A=0 • But penguin contribution is larger than B(cc)K0 • If new physics enhances the penguin amplitudes, S and A can be deviated from the SM values. • Reconstruction • B0 → D+D-→ (K-π-π+)(K+π-π-) → (K-π+π+)(KSπ-) 4.2s from no CPV PRD 85, 091106(R) (2012) Fourth Workshop on Theory, Phenomenology and Experiments in Flavour Physics

  11. 772 M BB Preliminary sin2f1 in BD*+D*- • Similar to BD+D- but needs angular analysis to decompose CP even/odd fraction (CP-odd) • First observation of Time Dependent CP violation in B to open charm decays Fourth Workshop on Theory, Phenomenology and Experiments in Flavour Physics

  12. 772 M BB sin2f1 in B0D*± D∓ • B0 can decay into both non-CP eigenstates D*+D- and D*-D+. • 5 TDCPV parameters • If relative hadronic phase can be neglectedS = - sin2f1 in the SM 4.0s from no CPV PRD 85, 091106(R) (2012) Fourth Workshop on Theory, Phenomenology and Experiments in Flavour Physics

  13. 772 M BB B → a1±π∓ arXiv:1205.5957 submitted to PRD. • Ba1p can be used to extract f2. • Signal extracted from a 4D(ΔE, F, m3π, H3π) fit Nsig. = 1445 ± 101 Br(B0→a1±(1260)π-)×Br(a1± → π+π-π±) = (11.1±1.0±1.4) × 10-6 Fourth Workshop on Theory, Phenomenology and Experiments in Flavour Physics

  14. f2eff in B → a1±π∓ ACP = −0.06 ±0.05 ±0.07 CCP = −0.01 ±0.11 ±0.09 SCP = −0.51 ±0.14 ±0.08 ΔC =+0.54 ±0.11 ±0.07 ΔS =−0.09 ±0.14 ±0.06 B0 B0 _ • first evidence of mixing-induced CPV in Ba1pwith 3.1σ • f2eff determined with a four - fold ambiguity : [-25.5˚, -9.1˚] [34.7˚, 55.3˚] [99.1˚, 115.5˚] → f2can be extracted using isospin analysis [M.Gronau and D.London, PRL 65 (1990) 3381] using SU(3) flavour symmetry [M.Gronau and J.Zupan, PRD 73 (2006) 057502] Fourth Workshop on Theory, Phenomenology and Experiments in Flavour Physics

  15. φ3 measurements from B→DK _ • Access φ3 via interference between B→DK and B→DK _ color allowed B-→D0K- ~ VcbVus* ~Aλ3 color suppressed B-→D0K- ~ VubVcs* ~Aλ3(ρ+iη) relative weak phase is φ3, relative strong phase is δB. Fourth Workshop on Theory, Phenomenology and Experiments in Flavour Physics

  16. φ3 measurements from B→DK _ • Reconstruct D in final states accessible to both D0 and D0 • Tree-body decay as D→KSπ+π-, KSK+K- • GGSZ (Dalitz) method (Giri-Grossman-Soffer-Zupan) • D = Dsup, Doubly-Cabbibo-suppressed decay as Kπ • ADS method (Atwood-Dunietz-Soni) • D = DCP, CP eigenstates as K+K-, π+π-, KSπ0 • GLW method (Gronau-London-Wyler) • Charm mixing and CPV are negligible. Phys.Rev. D68 (2003) 054018 Phys.Rev.Lett. 78 (1997) 3257-3260 Phys.Lett. B265 (1991) 172-176 Phys.Lett. B253 (1991) 483-488 Y.Grossman, A.Soffer, J.Zupan [PRD 72, 031501 (2005)] Fourth Workshop on Theory, Phenomenology and Experiments in Flavour Physics

  17. 772M BB Submitted to PRD arXiv:1204.6561 Binned Dalitz (B-→[KSππ]DK-) • Avoid the modeling error by optimal binning of the Dalitz(KSππ) plot observable Dalitz plane +15.1 -14.9 φ3 = (77.3 ±4.1 ±4.3)˚ rB = 0.145 ± 0.030 ±0.010 ±0.011 δB = (129.9 ±15.0 ±3.8 ±4.7)˚ The 3rd errors come from binning in Dalitz plane provided by CLEO-c. Previous result Fourth Workshop on Theory, Phenomenology and Experiments in Flavour Physics

  18. ADS in neutral B ADS in charged B Suppressed B decay × Favored D decay × color suppression Favored B decay × Doubly Suppressed D decay amplitude ratio (rB)for the two paths is 0.1~0.2 ADS in neutral B Both paths are color suppressed. The amplitude ratio (rs) can be ~0.4  larger CPV and higher sensitivity to f3 are expected!! Fourth Workshop on Theory, Phenomenology and Experiments in Flavour Physics

  19. 772 M BB Submitted to PRD(RC) arXiv: 1205, 0422 ADS in B0→[Kπ]DK*0 B flavor is tagged by the charge of K from K*. (K* is reconstructed with charged K and π.) RDK*0 < 0.16 @95 % C.L. rS < 0.4 @ 95 % C.L. Most stringent limit on RDK*0 to date DK Signal Dπ BB continuum Fourth Workshop on Theory, Phenomenology and Experiments in Flavour Physics

  20. Charm Physics Fourth Workshop on Theory, Phenomenology and Experiments in Flavour Physics

  21. 976fb-1 preliminary D0-D0bar mixing • Large D0 mixing observed by Belle, Babar and CDF is one of the interesting results in charm physics. • Since D0 mixing (x and y) is small, decay rate can be expressed by • Exponential decay modulates with x and y very slowly • Measurement of life time difference btw flavor specific K+K- and p+p- and CP eigenstate K+p- can probe yCP • If CP is violated, lifetime asymmetry seen If CP conserved, Evidence for difference of CPV was observed by LHCb and CDF Fourth Workshop on Theory, Phenomenology and Experiments in Flavour Physics

  22. Proper Time Distributions • Simultaneous binned fit to KK, Kp and pp. Fourth Workshop on Theory, Phenomenology and Experiments in Flavour Physics

  23. Fit Result Preliminary • Measurement of yCP with a significance of 4.5s • 5.1s if only stat error considered • AG is consistent with null. Fourth Workshop on Theory, Phenomenology and Experiments in Flavour Physics

  24. 913fb-1 preliminary Ds Decay Constant fDs • Decay constant fDs can be extracted from measurements of branching fraction of pure leptonic decays. • Test of Lattice QCD. • SU(3) flavor breaking by taking ratio fDs/fD • To check B meson decay constant, since fDs/fD= fBs/fB is good approximation fDs Fourth Workshop on Theory, Phenomenology and Experiments in Flavour Physics

  25. Reconstruction of Unbiased Ds • Using a recoil mass technique, unbiased Ds is reconstructed. 2 Fourth Workshop on Theory, Phenomenology and Experiments in Flavour Physics

  26. Preliminary Ds ln mn • Leptonic decays are reconstructed by • Ds  mn : m and mn2 = 0 in • Ds  tn, t  enn, mnn, pn : • Single charged particle • Extra Energy in ECL EECL = 0 • Branching Fraction and Decay constant tn(enn) tn(mnn) tn(pn) Fourth Workshop on Theory, Phenomenology and Experiments in Flavour Physics

  27. fDs Comparison • Belle result is the most precise to date. • Experimental average is consistent with (and 1.8s away from) the most precise Lattice QCD result. Fourth Workshop on Theory, Phenomenology and Experiments in Flavour Physics

  28. Summary • Belle has accumulated the world largest integrated luminosity of more than 1ab-1. • With the data, recent results on B and charm are shown • f1 : B(cc)K0, DD, D*D, D*D* • f2 : Ba1p • f3 : BDK • D0 mixing • Decay constant of Ds meson • Still many analyses for final results are in pipeline. Stay tuned! • Belle II at Super-KEKB which is under construction will probe new physics with 50 times larger data. •  Thomas Kuhr’s talk Fourth Workshop on Theory, Phenomenology and Experiments in Flavour Physics

  29. backup Fourth Workshop on Theory, Phenomenology and Experiments in Flavour Physics

  30. 535M BB PRD 76, 091103(R) (2007) Previous sin2f1 in B(cc)K0 sin2φ1 = 0.642 ± 0.031 ± 0.017 A= 0.018 ± 0.021 ± 0.014 Fourth Workshop on Theory, Phenomenology and Experiments in Flavour Physics

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