Andrzej Bozek (IFJ PAN, Krak

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B hadron decays to open charm production in
B-factories
The 7th International Conference on Hyperons,
Charm And Beauty Hadrons, BEACH 2006, 2-8 July,
Lancaster

• A.Bozek
• 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)
, DD- for sin(2b/2F1), DK for F3/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
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Outline

• Charmed-strange Mesons B decays
• - B0? DsJ(2317)K-, B0? DsJ(2460)K-
• - B?D DsJ
• - B ?D- Ds
• Charm counting new measurement
• cu,cd meson excited states in
• - B-?Dp-p- B-?D(2010)p-p-
• - B0?D0pp- B0?D0(2010)pp-
• New Results for the GLW Method (D ? fCP)
• B0?Dwp- factorization test

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Charmed-strange Mesons
BABAR 91 fb-1 PRL 90, 242001 (2003)
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 DK 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 JP0 and JP1, respectively

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B0? DsJ(2317)K-, B0? DsJ(2460)K-
hep-ex/0507064
Update with 2.5 x data(), 386M BB
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B?D DsJ(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
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B?D DsJ (2460)
Belle 274M BB BELLE-CONF- 0461 (2004)

(b) DsJ(2460)?Ds ?
(c) DsJ(2460)?Ds (2112) ?0
Ds? Ds ?
No Ds ? decay for J0
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)
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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)
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More Studies of DsJ(2317) and DsJ(2460)
Pattern for DsJK does not extend to the DsJD
decays, with factor of 10 differences
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Phys.Rev. D71 (2005) 091104
Partial reconstruction ( avoiding Ds subdecay
uncertainties)
Soft foton reconstruction crucial (p0 veto,
cluster shape selections)
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Phys.Rev. D71 (2005) 091104
Full reconstruction ( Ds partial fraction
dependent)
Cleaner sample photon selection relaxed
Ratio of full/partial rec.
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Flavor tagged charm production in B decays
PRD 70, 091106(R)
Full reconstruction of one B in the event and the
charm hadron on the other side allows
flavor-specific charm counting
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Flavor tagged charm production in B decays
Charm counting in 2-d likelihood fit (mES,
charmed hadron mass)
B-
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Flavor tagged charm production in B decays
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cu,cd meson excited states D
In heavy quark limit, light quark angular
momentum Jq is conserved resulting in
spin-doublet spectroscopic
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Phys. Rev. D 69, 112002 (2004)

Scalar Broad State first observation
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Phys. Rev. D 69, 112002 (2004)
consistent with WA
Narow D1 consistent with WA
Broad D1 consistent with previous Cleo result
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hep-ex/0412072
Two body sample
Three body quasi two body sample
Consistent with prior CLEO Belle measurment.
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hep-ex/0412072
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hep-ex/0412072
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New Results for the GLW Method (D ? fCP)
Phys. Rev. D, 051105(R) (2006)
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)
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Factorization tests
hep-ex/0604009
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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