Andrzej Bożek (IFJ PAN, Kraków) B hadron decays to open charm production in B-factories BEACH 2006 1 B hadron decays to open charm at B-factories A.Bożek.

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Presentation transcript:

Andrzej Bożek (IFJ PAN, Kraków) B hadron decays to open charm production in B-factories BEACH B hadron decays to open charm at B-factories A.Bożek IFJ Kraków on behalf of the Belle Collaboration The 7th International Conference on Hyperons, Charm And Beauty Hadrons, BEACH 2006, 2-8 July, Lancaster B decays to open charm covers huge range of physics starting from determination of CKM matrix parameters eg. D ( * ) h 0 for cos(2   ), D*+D*- for sin   ), DK for  3 /  semileptonic decays (V cb ) … All these were presented in different talks. However, many topics remain e.g. Charm spectroscopy (B remain a clean environment for finding new particles ), B  D X and B  D X branching fractions and testing the QCD framework… Subjective and not complete sample of results

Andrzej Bożek (IFJ PAN, Kraków) B hadron decays to open charm production in B-factories BEACH Outline Charmed strange mesons in B decays - B 0  D sJ * (2317) + K -, B 0  D sJ * (2460) + K - - B  D D sJ - B  D* - D s * + Charm counting new measurement Excited cu, cd states in B decays - B -  D +     B -  D* + (2010)     - B 0  D 0  +   B 0  D* 0 (2010)  +   New Results for the GLW Method (D → f CP ) B 0  D* +   factorization test

Andrzej Bożek (IFJ PAN, Kraków) B hadron decays to open charm production in B-factories BEACH Charmed strange mesons D sJ * (2317) and D sJ (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-wave cs mesons with J P =0 + and J P =1 +, respectively BABAR: 91 fb -1 PRL 90, (2003) CLEO: 13.5 fb -1 PRD 68, (2003) Belle: 124M BB PRL 91, (2003)

Andrzej Bożek (IFJ PAN, Kraków) B hadron decays to open charm production in B-factories BEACH B 0  D sJ * (2317) + K -, B 0  D sJ * (2460) + K - hep-ex/ Update with 386M BB

Andrzej Bożek (IFJ PAN, Kraków) B hadron decays to open charm production in B-factories BEACH B  D D sJ * (2317) +, D sJ * (2317) +  D s +  0 D sJ * (2317) decay mode  natural spin-parity D sJ * (2317) decay angular distribution  spin 0 Belle: 274M BB BELLE-CONF (2004) 00 Solid line: J = 0  2 / d.o.f = 3/8 Dotted line: J = 1  2 / d.o.f = 38/8 Natural spin- parity  J P = 0 +

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

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

Andrzej Bożek (IFJ PAN, Kraków) B hadron decays to open charm production in B-factories BEACH More Studies of DsJ(2317) and DsJ(2460) Pattern for D sJ K does not extend to the D sJ D decays, with factor of 10 differences Bf(B  D sJ K)~ Bf(B  D s K) Bf(B  D sJ D)<< Bf(B  D s D) Huge effort from Belle and Babar was made to explore D sJ features But D sJ reamins mysterious ~10 -5 ~10 -2 ~10 -3 ~10 -5

Andrzej Bożek (IFJ PAN, Kraków) B hadron decays to open charm production in B-factories BEACH Partial reconstruction ( avoiding D + s subdecay uncertainties) Soft photon reconstruction crucial (  0 veto, cluster shape selections) Phys.Rev. D71 (2005)

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

Andrzej Bożek (IFJ PAN, Kraków) B hadron decays to open charm production in B-factories BEACH Charm counting puzzle (history) Semileptonic branching ratio puzzle

Andrzej Bożek (IFJ PAN, Kraków) B hadron decays to open charm production in B-factories BEACH Flavor tagged charm production in B decays PRD 70, (R) b → cW*- : dominant, correlated c production, rate close to 100% W- decays: anti-correlated c production, lower rate 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-factories BEACH Flavor tagged charm production in B decays Charm counting in 2-d likelihood fit (m ES, charmed hadron mass) B−B−

Andrzej Bożek (IFJ PAN, Kraków) B hadron decays to open charm production in B-factories BEACH Flavor tagged charm production in B decays

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

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

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

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

Andrzej Bożek (IFJ PAN, Kraków) B hadron decays to open charm production in B-factories BEACH hep-ex/ Bound state must be handle

Andrzej Bożek (IFJ PAN, Kraków) B hadron decays to open charm production in B-factories BEACH hep-ex/

Andrzej Bożek (IFJ PAN, Kraków) B hadron decays to open charm production in B-factories BEACH New Results for the GLW Method (D → f CP ) Theoretically clean B → D  background Limited statistics 4 observables (A CP+-,R CP+- ) to determine r B, ,  B New BaBar & Belle: D 0  K S , K S  232 M(BB) 131 CP+ 148 CP- Phys. Rev. D 73, (R) (2006) Similar results were presented by Belle based on 272M(BB) Phys. Rev. D, (R) (2006)

Andrzej Bożek (IFJ PAN, Kraków) B hadron decays to open charm production in B-factories BEACH Factorization tests … hep-ex/

Andrzej Bożek (IFJ PAN, Kraków) B hadron decays to open charm production in B-factories BEACH Summary Lot of interesting results from B  open charm: D sJ properties studied using kinematical constraint from B decays. Zoology of exited mesons D** studied. Test of QCD aproximation methods

Andrzej Bożek (IFJ PAN, Kraków) B hadron decays to open charm production in B-factories BEACH Backup slides

Andrzej Bożek (IFJ PAN, Kraków) B hadron decays to open charm production in B-factories BEACH B 0  D sJ * (2317) + K -, B 0  D sJ * (2460) + K -