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

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

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B hadron decays to open charm at B-factories

A.BożekIFJ 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(*)h0 for cos(2) , D*+D*- for sin), DK for 3/ semileptonic decays (Vcb) … 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

http://indico.cern.ch/conferenceDisplay.py?confId=a056809



















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Outline

• Charmed strange mesons in B decays - B0 DsJ

*(2317)+K-, B0 DsJ*(2460)+K-

- BD DsJ

- B D*- Ds*+

• Charm counting new measurement • Excited cu, cd states in B decays - B-D+ B-D*+(2010) - B0D0+ B0D*0(2010)+

• New Results for the GLW Method (D → fCP)

• B0D*+ factorization test


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Charmed strange mesons

• 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-wave cs mesons

with JP=0+ and JP=1+, respectively

BABAR: 91 fb-1 PRL 90, 242001

(2003)CLEO: 13.5 fb-1 PRD 68, 032002

(2003)Belle: 124M BB PRL 91, 262002

(2003)


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B0 DsJ*(2317)+K-, B0 DsJ

*(2460)+K-hep-ex/0507064

Update with 386M BB


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BD DsJ*(2317)+, DsJ

*(2317)+Ds+0

• DsJ*(2317) decay mode natural spin-parity

• DsJ*(2317) decay angular distribution spin 0

Belle: 274M BB

BELLE-CONF-0461 (2004)

0

Solid line:J = 02/d.o.f = 3/8

Dotted line:J = 12/d.o.f =

38/8

Natural spin-parity

JP = 0+


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BD DsJ (2460)+

No Ds decay for J=0

(b): DsJ(2460)+Ds+

(c): DsJ(2460)+Ds

*(2112)

+0 Ds*+

Ds+

Solid line:J = 1 S-wave

Ds*0

cos(Ds*0)

JP = 1+

Dashed line:J = 22/d.o.f =

89/8

Solid line:J = 12/d.o.f = 4/8

Belle: 274M BB

BELLE-CONF-0461 (2004)


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More Studies of DsJ(2317) and DsJ(2460)

First measurement of absolute BFs ee-- DD**

ee++BBrecoreco

BBsignalsignal

D*D*

XX

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)

Hep-ex/0605035


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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

Bf(B DsJK)~ Bf(B DsK)

Bf(B DsJD)<< Bf(B DsD)

Huge effort from Belle and Babar wasmade to explore DsJ features

But DsJ reamins mysterious

~10-5

~10-2~10-3

~10-5


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Partial reconstruction ( avoiding D+s subdecay uncertainties)

Soft photon reconstructioncrucial (0 veto, cluster shapeselections)

Phys.Rev. D71 (2005) 091104


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Full reconstruction ( D+s partial fraction dependent)

Ratio of full/partial rec. :

Phys.Rev. D71 (2005) 091104

Cleaner sample photon selection relaxed


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Charm counting puzzle (history)

Semileptonic branching ratio puzzle


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Flavor tagged charm production in B decays

PRD 70, 091106(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


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Charm counting in 2-d likelihood fit (mES, charmed hadron mass)

B−


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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 spectroscopy


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Phys. Rev. D 69, 112002 (2004)

Broad Scalar State – first observation


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Phys. Rev. D 69, 112002 (2004)

Narow D1 consistent with WA

Broad D’1 consistent with previousCleo result

consistent with WA


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hep-ex/0412072

Two body sample:Three body + quasi two body sample:

Consistent with previousCLEO & Bellemeasurment.


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hep-ex/0412072

Bound state must be handle


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hep-ex/0412072


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New Results for the GLW Method (D → fCP)

04.013.006.0

04.013.035.0

05.010.086.0

04.012.090.0

CP

CP

CP

CP

A

A

R

R

12.040.026.0

08.019.008.0

08.026.065.0

11.040.096.1

CP

CP

CP

CP

A

A

R

R

( ) ( ) 2 sin sin

( ) ( )CP CP

CP CPCP

CP

B BB D K B D K

B D K B D K

rAR

02( ) ( )

1 2 cos cos( )

CB B B

P PCP

CB D K B D K

B D Kr rR

•Theoretically clean

•B → D background

•Limited statistics

4 observables (ACP+-,RCP+-)

to determine rB, , B

KDCP0

KDCP0

New BaBar & Belle: D0 KS, KS

2/)()( 00 KDBKDB

232 M(BB)

131 CP+

148 CP-

Phys. Rev. D 73, 051106(R) (2006) Similar results were presented by Belle based on 272M(BB)

Phys. Rev. D, 051105(R) (2006)


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Factorization tests … hep-ex/0604009


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Summary

• Lot of interesting results from B open charm: DsJ properties studied using kinematical

constraint from B decays. Zoology of exited mesons D** studied. Test of QCD aproximation methods


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Backup slides


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B0 DsJ*(2317)+K-, B0 DsJ

*(2460)+K-

Documents

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