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B hadron decays to open charm production in B-factories

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The 7th International Conference on Hyperons, Charm And Beauty Hadrons, BEACH 2006, 2-8 July, Lancaster. B hadron decays to open charm production in B-factories. A.Bożek IFJ Kraków on behalf of the Belle Collaboration.

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B hadron decays to open charm production in B-factories
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  1. The 7th International Conference on Hyperons, Charm And Beauty Hadrons, BEACH 2006, 2-8 July, Lancaster B hadron decays to open charm production in B-factories A.Bożek IFJ Kraków on behalf of the Belle Collaboration B decays to open charm covers huge varieties of physics subjects starting from determination of CKM matrix parameters eg. D(*)h0 for cos(2b/2F1) , D*+D*- for sin(2b/2F1), DK forF3/g (most promising Dalitz analysis but also GLW or ADS),semileptonic decays (Vcb) … All presented in different talks, still a lot of subjects remain. Eg. Charm spectroscopy (B remain a clean framework for new particles), B  D X and B  D X branching fractions, QCD test framework… Subjective and not complete sample of results Andrzej Bożek (IFJ PAN, Kraków) B hadron decays to open charm production in B-factoriesBEACH 2006

  2. Outline • Charmed-strange Mesons B decays - B0 DsJ*(2317)+K-, B0 DsJ*(2460)+K- - BDDsJ - B D*-Ds*+ • Charm counting new measurement • cu,cd meson excited states in … - B-D+p-p-B-D*+(2010)p-p- - B0D0p+p-B0D*0(2010)p+p- • New Results for the GLW Method (D → fCP) • B0D*+wp-factorization test Andrzej Bożek (IFJ PAN, Kraków) B hadron decays to open charm production in B-factoriesBEACH 2006

  3. BABAR: 91 fb-1 PRL 90, 242001 (2003) Charmed-strange Mesons CLEO: 13.5 fb-1 PRD 68, 032002 (2003) Belle: 124M BB PRL 91, 262002 (2003) • DsJ*(2317) and DsJ(2460) first • observed by BABAR and CLEO in cc continuum events, and by Belle in B-decay • Both masses unexpectedly low: below DK and D*K threshold, respectively • Only isospin-violating or electromagnetic decays kinematically allowed  narrow widths • Decay pattern and decay angular distributions consistent with interpretation as P-wavecs mesons with JP=0+ and JP=1+, respectively Andrzej Bożek (IFJ PAN, Kraków) B hadron decays to open charm production in B-factoriesBEACH 2006

  4. B0 DsJ*(2317)+K-, B0 DsJ*(2460)+K- hep-ex/0507064 Update with ~2.5 x data(*), 386M BB Andrzej Bożek (IFJ PAN, Kraków) B hadron decays to open charm production in B-factoriesBEACH 2006

  5. 0 BDDsJ*(2317)+,DsJ*(2317)+Ds+0 Belle: 274M BB BELLE-CONF- 0461 (2004) • DsJ*(2317) decay mode  natural spin-parity • DsJ*(2317) decay angular distribution  spin 0 Dotted line: J = 1 2/d.o.f = 38/8 Natural spin- parity  JP = 0+ Solid line: J = 0 2/d.o.f = 3/8 Andrzej Bożek (IFJ PAN, Kraków) B hadron decays to open charm production in B-factoriesBEACH 2006

  6. Belle: 274M BB BELLE-CONF- 0461 (2004) BDDsJ(2460)+ (b): DsJ(2460)+Ds+ (c): DsJ(2460)+Ds *(2112) +0 Ds*+ Ds+ No Ds  decay for J=0 Ds*0 Dashed line: J = 2 2/d.o.f = 89/8 Solid line: J = 1 S-wave Solid line: J = 1 2/d.o.f = 4/8 JP = 1+ cos(Ds*0) Andrzej Bożek (IFJ PAN, Kraków) B hadron decays to open charm production in B-factoriesBEACH 2006

  7. p e- D* Breco e+ Bsignal D* X More Studies of DsJ(2317) and DsJ(2460) Hep-ex/0605035 First measurement of absolute BFs Look for resonance structure in B recoil Combine with previous measurements of partial rates to obtain absolute BFs: = 0.70 +- 0.15 (Unknown where other .30±.15 goes) Andrzej Bożek (IFJ PAN, Kraków) B hadron decays to open charm production in B-factoriesBEACH 2006

  8. More Studies of DsJ(2317) and DsJ(2460) Pattern for DsJK does not extend to the DsJD decays, with factor of 10 differences Andrzej Bożek (IFJ PAN, Kraków) B hadron decays to open charm production in B-factoriesBEACH 2006

  9. Phys.Rev. D71 (2005) 091104 Partial reconstruction ( avoiding D+s subdecay uncertainties) Soft foton reconstruction crucial (p0 veto, cluster shape selections) Andrzej Bożek (IFJ PAN, Kraków) B hadron decays to open charm production in B-factoriesBEACH 2006

  10. Phys.Rev. D71 (2005) 091104 Full reconstruction ( D+s partial fraction dependent) Cleaner sample photon selection relaxed Ratio of full/partial rec. : Andrzej Bożek (IFJ PAN, Kraków) B hadron decays to open charm production in B-factoriesBEACH 2006

  11. b→cW*- : dominant, correlated c production, rate close to 100% • W- decays: anti-correlated c production, lower rate PRD 70, 091106(R) Flavor tagged charm production in B decays Full reconstruction of one B in the event and the charm hadron on the other side allows flavor-specific charm counting Andrzej Bożek (IFJ PAN, Kraków) B hadron decays to open charm production in B-factoriesBEACH 2006

  12. Flavor tagged charm production in B decays Charm counting in 2-d likelihood fit (mES, charmed hadron mass) B− Andrzej Bożek (IFJ PAN, Kraków) B hadron decays to open charm production in B-factoriesBEACH 2006

  13. Flavor tagged charm production in B decays Andrzej Bożek (IFJ PAN, Kraków) B hadron decays to open charm production in B-factoriesBEACH 2006

  14. cu,cd meson excited states: D** In heavy quark limit, light quark angular momentum Jq is conserved resulting in spin-doublet spectroscopic Andrzej Bożek (IFJ PAN, Kraków) B hadron decays to open charm production in B-factoriesBEACH 2006

  15. Phys. Rev. D 69, 112002 (2004) Scalar Broad State – first observation Andrzej Bożek (IFJ PAN, Kraków) B hadron decays to open charm production in B-factoriesBEACH 2006

  16. Phys. Rev. D 69, 112002 (2004) consistent with WA Narow D1 consistent with WA Broad D’1 consistent with previous Cleo result Andrzej Bożek (IFJ PAN, Kraków) B hadron decays to open charm production in B-factoriesBEACH 2006

  17. hep-ex/0412072 Three body + quasi two body sample: Two body sample: Consistent with prior CLEO & Belle measurment. Andrzej Bożek (IFJ PAN, Kraków) B hadron decays to open charm production in B-factoriesBEACH 2006

  18. Bound state must be handle hep-ex/0412072 Andrzej Bożek (IFJ PAN, Kraków) B hadron decays to open charm production in B-factoriesBEACH 2006

  19. hep-ex/0412072 Andrzej Bożek (IFJ PAN, Kraków) B hadron decays to open charm production in B-factoriesBEACH 2006

  20. Phys. Rev. D, 051105(R) (2006) New Results for the GLW Method (D → fCP) 232 M(BB) 4 observables (ACP+-,RCP+-) to determine rB, g, dB 131 CP+ • Theoretically clean • B → Dp background • Limited statistics 148 CP- New from BaBar: D0 KSw, KSf Phys. Rev. D 73, 051106(R) (2006) Similar results were presented by Belle based on 272M(BB) Andrzej Bożek (IFJ PAN, Kraków) B hadron decays to open charm production in B-factoriesBEACH 2006

  21. Factorization tests … hep-ex/0604009 Andrzej Bożek (IFJ PAN, Kraków) B hadron decays to open charm production in B-factoriesBEACH 2006

  22. Summary • Lot of interesting results from B charm: Dsj properties studied using kinematical constraint from B decays. Exited mesons D** zoology studied. Test for QCD aproximation methods Andrzej Bożek (IFJ PAN, Kraków) B hadron decays to open charm production in B-factoriesBEACH 2006