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Charm and Decays Results from Babar and Belle Jens Sören Lange (University of Giessen) 43 th Rencontres de Moriond QCD and High Energy Interactions La Thuile. March 9, 2008
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Charm and Decays

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Charm and  Decays. Results from Babar and Belle Jens Sören Lange (University of Giessen) 43 th Rencontres de Moriond QCD and High Energy Interactions La Thuile. March 9, 2008. Outline. Charm Decays D sJ decays into D*K: D s1 (2536) into DK: D sJ (2700), D sJ (2860) - PowerPoint PPT Presentation
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Page 1: Charm and    Decays

Charm and DecaysResults from Babar and Belle

Jens Sören Lange(University of Giessen)

43th Rencontres de MoriondQCD and High Energy Interactions

La Thuile. March 9, 2008

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Outline

Charm Decays

● DsJ decays into D*K: Ds1(2536) into DK: DsJ(2700), DsJ(2860)

● Ds+ ! + , fDs

● Charmed baryons, c

Charm Decays

● DsJ decays into D*K: Ds1(2536) into DK: DsJ(2700), DsJ(2860)

● Ds+ ! + , fDs

● Charmed baryons, c

Decays

● Hadronic decayswith in final state

● Hadronic decayswith in final state

Decays

● Hadronic decayswith in final state

● Hadronic decayswith in final state

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Nucl. Instr. Meth. A479(2002)1

Integrated Luminosity 512.2 fb–1

Nucl. Instr. Meth. A479(2002)1

Integrated Luminosity 512.2 fb–1

Nucl. Instr. Meth A479(2002)117

Integrated Luminosity 773.7 fb–1

Nucl. Instr. Meth A479(2002)117

Integrated Luminosity 773.7 fb–1

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Charm Production at B Factories

● from B decays

~99% of all B mesons decay into charm final states

● from B decays

~99% of all B mesons decay into charm final states

● in continuum

cross section (~1.2 nb) is as high as B meson cross section (~1.1 nb)

● in continuum

cross section (~1.2 nb) is as high as B meson cross section (~1.1 nb)

D+

D–

D+

D–

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A brief history of DsJ states

• Babar observed Ds0

*+(2317)Ds+ o

Phys. Rev. Lett. 90(2003)242001

• Cleo observed Ds1

+(2460)Ds+*o

Phys. Rev. D 68(2003)032002

• Ds in final state> most probable assignment[c s] L=1 states

• ~100 MeV too low comparedto early quark modelsGodfrey, Isgur, PRD 32(1985)189

• Properties of other states in Ds system?

• Babar observed Ds0

*+(2317)Ds+ o

Phys. Rev. Lett. 90(2003)242001

• Cleo observed Ds1

+(2460)Ds+*o

Phys. Rev. D 68(2003)032002

• Ds in final state> most probable assignment[c s] L=1 states

• ~100 MeV too low comparedto early quark modelsGodfrey, Isgur, PRD 32(1985)189

• Properties of other states in Ds system?

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[c[cs] multipletss] multiplets

There are two 1+ states, mass difference m ' 76 MeV

! investigation of mixing

There are two 1+ states, mass difference m ' 76 MeV

! investigation of mixing

spin-orbit tensorspin-spin

L = 2…..

jq = sq + L, J = jq + sQ

L = 0 jq = 1/2 1-

0-

Ds*

Ds

mix?

0+

1+

1+

2+

JP

D*K threshold

D K thresholdDs0(2317)

Ds1(2460)

Ds1(2536)

DsJ(2573)jq = 3/2

jq = 1/2

L = 1

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DsJ decays

DsJ+

DsJ+

0

Ds+

D0

K+

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DsJ Decays into D*K

Ds1(2536)

DsJ Decays into D*K

Ds1(2536)

Ds1(2536)DsJ(2700)Ds ! Charmed Baryons c

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1st Observation of Ds1(2536) in B Decays

● B !D(*)D(*) K at Babar347 fb–1 , PRD-RC 77(2008)011102Ds1(2536)+ ! D*+Ks

0, D*0 K+

● Analysis of Ds1(2536) helicityfor quantum number confirmation

● JP=1+ in pure S-wavewould be flat

● JP=1– in pure P-waveand JP=1+ with S/D-wave admixturefit both well (2/n.d.f.=9.6/9 vs. 9.3/9)

● B !D(*)D(*) K at Babar347 fb–1 , PRD-RC 77(2008)011102Ds1(2536)+ ! D*+Ks

0, D*0 K+

● Analysis of Ds1(2536) helicityfor quantum number confirmation

● JP=1+ in pure S-wavewould be flat

● JP=1– in pure P-waveand JP=1+ with S/D-wave admixturefit both well (2/n.d.f.=9.6/9 vs. 9.3/9)

1-

1+

2+,–disfavoured

PDG2007

Ds1(2536)DsJ(2700)Ds ! Charmed Baryons c

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Observation of Observation of DDs1s1(2536)(2536)→→DD++ππ––KK++

hep-ex/0709.4184 PRD 77(2008)032001

● Formerly known decay modes of Ds1(2536) ! D*+Ks

! D*0K+

! Ds +–

● Bellee+e-→Ds1(2536)X462 fb-1

Ds1(2536)→D+ – K+

3-body1st observation

Ds1(2536)→D*+Ks

2-bodyused for partial wave analysis

● Formerly known decay modes of Ds1(2536) ! D*+Ks

! D*0K+

! Ds +–

● Bellee+e-→Ds1(2536)X462 fb-1

Ds1(2536)→D+ – K+

3-body1st observation

Ds1(2536)→D*+Ks

2-bodyused for partial wave analysis

2-body

3-body

Ds1(2536)DsJ(2700)Ds ! Charmed Baryons c

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Partial Wave Analysis Partial Wave Analysis DDs1s1(2536)(2536)→→D*D*++KK00ss

● Mixing of jMixing of jqq=1/2 and j=1/2 and jqq=3/2 states=3/2 states● HQET prediction for P-wave cs states:

• 1+(jq=3/2)→D*K should be pure D-wave decay

• 1+(jq=1/2)→D*K should be pure S-wave decay

● If HQET not exact: mixing of S/D waves possible

(by LS interaction)

● Mixing of jMixing of jqq=1/2 and j=1/2 and jqq=3/2 states=3/2 states● HQET prediction for P-wave cs states:

• 1+(jq=3/2)→D*K should be pure D-wave decay

• 1+(jq=1/2)→D*K should be pure S-wave decay

● If HQET not exact: mixing of S/D waves possible

(by LS interaction)

Ds1(2536)DsJ(2700)Ds ! Charmed Baryons c

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Partial Wave Analysis Partial Wave Analysis DDs1s1(2536)(2536)→→D*D*++KK00ss

● Helicity formalism

● Fit results (syst. errors):

● S-wave dominates in Ds1(2536)→D*K(72 3 1)% might contradict HQET (c quark is not infinitely heavy)note: D-wave might be suppressed by centrifugal barrier

● Ds1(2460) and Ds1(2536) mix

● Helicity formalism

● Fit results (syst. errors):

● S-wave dominates in Ds1(2536)→D*K(72 3 1)% might contradict HQET (c quark is not infinitely heavy)note: D-wave might be suppressed by centrifugal barrier

● Ds1(2460) and Ds1(2536) mix

Ds1(2536)DsJ(2700)Ds ! Charmed Baryons c

hep-ex/0709.4184 PRD 77(2008)032001

3-dim analysisprojections shown

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DsJ Decays into DK

DsJ(2700), DsJ(2860)

DsJ Decays into DK

DsJ(2700), DsJ(2860)

Ds1(2536)DsJ(2700)Ds ! Charmed Baryons c

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DsJ(2700)

● Belle, 414 fb-1

● DsJ(2700)dominating resonance in this B decay

● Belle, 414 fb-1

● DsJ(2700)dominating resonance in this B decay

New DNew DsJsJ meson in B meson in B++→→DD00DD00KK++

arXiv:0707.3491

Phys. Rev. Lett. 100(2008)092001

M(D0D0)>3.85 GeV

Ds1(2536)DsJ(2700)Ds ! Charmed Baryons c

(4160) reflection

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● Helicity angle distribution ● J=1 preferred● 1→0–0– decay implies

L=1! negative parity

● DsJ(2700) JP=1– state could be:● radial excitation 23S1

predicted by potential models at m~2720 GeVClose, Swanson, PLB 647(2007)159

● chiral doublet state 1– to 1+ Ds1(2536) predicted from chiral symmetryat m=2721±10 MeVNowak, Rho, Zahed, Acta Phys. Polon. B35, 2377 (2004)

● Helicity angle distribution ● J=1 preferred● 1→0–0– decay implies

L=1! negative parity

● DsJ(2700) JP=1– state could be:● radial excitation 23S1

predicted by potential models at m~2720 GeVClose, Swanson, PLB 647(2007)159

● chiral doublet state 1– to 1+ Ds1(2536) predicted from chiral symmetryat m=2721±10 MeVNowak, Rho, Zahed, Acta Phys. Polon. B35, 2377 (2004)

Quantum numbers of DQuantum numbers of DsJsJ(2700) (2700) →→DD00KK++

J=J=00 22//ndf=ndf=112112//55J=1J=1 22//ndf= ndf= 1111//5 5 J=2J=2 22//ndf=ndf=146/5146/5

D0

K+

Ds1(2536)DsJ(2700)Ds ! Charmed Baryons c

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DDsJsJ(2860) and D(2860) and DsJsJ(2700) at Babar and Belle(2700) at Babar and Belle

● Babar, 240 fb–1

in e+e– continuumPRL 97(2006)222001

● evidence for a new DsJ statem=2856.6±1.5±5.0 MeV=48±7±10 MeV

● Babar observes 3 structures● Ds2(2573)+● a broad structure peaking around 2.7 GeV

! DsJ(2700)?

● DsJ(2860)! not seen in Belle dataprobably in B decays suppressed by high spin?

● Babar, 240 fb–1

in e+e– continuumPRL 97(2006)222001

● evidence for a new DsJ statem=2856.6±1.5±5.0 MeV=48±7±10 MeV

● Babar observes 3 structures● Ds2(2573)+● a broad structure peaking around 2.7 GeV

! DsJ(2700)?

● DsJ(2860)! not seen in Belle dataprobably in B decays suppressed by high spin?

Ds1(2536)DsJ(2700)Ds ! Charmed Baryons c

Ds2(2573) DsJ(2700)? DsJ(2860)

DsJ(2700)?

DsJ(2860)

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Ds+!+

Ds+!+

Ds1(2536)DsJ(2700)Ds ! Charmed Baryons c

● Pure leptonic decay, mediated by single W boson● Br measurement allows determination of fDs

● Pure leptonic decay, mediated by single W boson● Br measurement allows determination of fDs

'1

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Ds+!+

● Babar, 230.2 fb–1

PRL 98(2007)141801489§55 events

● Belle, 548 fb-1 arXiv:0709.1340subm. to Phys. Rev. Lett.169§16§8 events

● Signal peaks inM()–M()=143.5 MeVormrecoil(DKX)=m=0

● Background shapeDs

+ ! e+

suppressed by factor (m/me)2 ~105

● Babar, 230.2 fb–1

PRL 98(2007)141801489§55 events

● Belle, 548 fb-1 arXiv:0709.1340subm. to Phys. Rev. Lett.169§16§8 events

● Signal peaks inM()–M()=143.5 MeVormrecoil(DKX)=m=0

● Background shapeDs

+ ! e+

suppressed by factor (m/me)2 ~105

Ds1(2536)DsJ(2700)Ds ! Charmed Baryons c

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Ds+!+ and fDs

● Comparison to theorysee Rosner, Stone, arXiv:0802.1043

● recent Lattice QCD calculationPhys. Rev. Lett. 100(2008)062002fDs=241§3 MeVa=0.09 fm, grid 283 x 96,incl. sea quarks

● indication for new physics?

● Comparison to theorysee Rosner, Stone, arXiv:0802.1043

● recent Lattice QCD calculationPhys. Rev. Lett. 100(2008)062002fDs=241§3 MeVa=0.09 fm, grid 283 x 96,incl. sea quarks

● indication for new physics?

Ds1(2536)DsJ(2700)Ds ! Charmed Baryons c

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Charmed Baryons:Studies of the c system

Charmed Baryons:Studies of the c system

c c c c

Ds1(2536)DsJ(2700)Ds ! Charmed Baryons c

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A brief history of c charmed baryons

● c+K– + final state is used

for searches of double charm baryon ground states (ccq) weak decays

● However, Belle observed two new statesc(2980)+,0 ! c

+ Ks0 –

c(3077)+,0 ! c+ Ks

0 ● These are strong decays● Why is this surprising?

formerly only knowndecays c* ! c or c

● Here, the strange and the charm quark are observed in different hadrons

● c+K– + final state is used

for searches of double charm baryon ground states (ccq) weak decays

● However, Belle observed two new statesc(2980)+,0 ! c

+ Ks0 –

c(3077)+,0 ! c+ Ks

0 ● These are strong decays● Why is this surprising?

formerly only knowndecays c* ! c or c

● Here, the strange and the charm quark are observed in different hadrons

Belle, hep-ex/0606051 Phys.Rev.Lett. 97(2006)162001

Ds1(2536)DsJ(2700)Ds ! Charmed Baryons c

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Evidence for two new c states

● Babar 384 fb-1Phys. Rev. D 77(2008)012002

● Confirmation ofc(2980) and c(3077)

● Final state c K but require invariant mass

● Evidence for two new statesc(3055)+ ! c(2455)++ K–

6.4 (JP=1/2+)

and c(3122)+ ! c(2520)++ K–

3.6 (JP=3/2+)

● A new Puzzlewhy decay into c(isospin=1) K?usc ! uucus

● Babar 384 fb-1Phys. Rev. D 77(2008)012002

● Confirmation ofc(2980) and c(3077)

● Final state c K but require invariant mass

● Evidence for two new statesc(3055)+ ! c(2455)++ K–

6.4 (JP=1/2+)

and c(3122)+ ! c(2520)++ K–

3.6 (JP=3/2+)

● A new Puzzlewhy decay into c(isospin=1) K?usc ! uucus

Cut on c(2455)

Cut on c(2520)

Ds1(2536)DsJ(2700)Ds ! Charmed Baryons c

c(2980)c(3077)

c(3055)

c(3055)c(3122)

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Excited c Transistions

● Belle, 414 fb-1, hep-ex/0802.3968 subm. to Phys. Lett. B

● Is the c (2980) the first positive parity excitation of the c? (mass could be high enough)

● Or higher radial (n¸2) excitation?● New decay mode observed

c*(2980) ! c

*(2645) ● Single transitions give hints

for quantum number assignmente.g. c(2815)(3/2–) ! c is forbiddenc(2815)(3/2–) ! c(2645) ! c seen by Cleo

● This decay mode (assume S-wave) is predicted dominant for c1(½+)

● Belle, 414 fb-1, hep-ex/0802.3968 subm. to Phys. Lett. B

● Is the c (2980) the first positive parity excitation of the c? (mass could be high enough)

● Or higher radial (n¸2) excitation?● New decay mode observed

c*(2980) ! c

*(2645) ● Single transitions give hints

for quantum number assignmente.g. c(2815)(3/2–) ! c is forbiddenc(2815)(3/2–) ! c(2645) ! c seen by Cleo

● This decay mode (assume S-wave) is predicted dominant for c1(½+)

Ds1(2536)DsJ(2700)Ds ! Charmed Baryons c

c(2815)

c(2980)

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Indication of another c state

● BABARPRD-RC 77, 031101 (2008) 210 fb-1

in B decaysB– ! [K– c

+] c–

Dalitz analysis

● BABARPRD-RC 77, 031101 (2008) 210 fb-1

in B decaysB– ! [K– c

+] c–

Dalitz analysis

● c(2930) ?● Predicted density of states

in this mass region is high

● c(2930) ?● Predicted density of states

in this mass region is high

Ds1(2536)DsJ(2700)Ds ! Charmed Baryons c

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Hadronic Tau DecaysHadronic Tau Decays

Hadronic Decays with Hadronic Decays with

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Decays with final state

● Belle, hep-ex/0708.0733485 fb-1, 446x106 +–

Uncertainties on Br‘s improved by factor 4-6

● 3 pseudoscalar meson case:Wess-Zumino termmight increase Br by factor ¸10– ! K– 0 Br = (4.7§1.1§0.4) x 10–5

– ! – 0 Br = (1.39§0.03§0.07) x 10–3

● – ! – 0 also breaks G parity! suppressed by factor ~(md – mu)2

● Ongoing work(requires separation of resonant and non-resonant part)

● Belle, hep-ex/0708.0733485 fb-1, 446x106 +–

Uncertainties on Br‘s improved by factor 4-6

● 3 pseudoscalar meson case:Wess-Zumino termmight increase Br by factor ¸10– ! K– 0 Br = (4.7§1.1§0.4) x 10–5

– ! – 0 Br = (1.39§0.03§0.07) x 10–3

● – ! – 0 also breaks G parity! suppressed by factor ~(md – mu)2

● Ongoing work(requires separation of resonant and non-resonant part)

Hadronic Decays with Hadronic Decays with

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peak in KKK-K+K-K-K+K-

● BABAR342 fb–1

Phys.Rev.Lett.100(2008)011801 ● – ! K+ K– K–

● Cabbibo suppressed (Vus~0.2)● Resonant is saturating

! excluding , upper limit Br < 2.5 x 10–6

● consistent with BellePhys. Lett B643(2006)5

● BABAR342 fb–1

Phys.Rev.Lett.100(2008)011801 ● – ! K+ K– K–

● Cabbibo suppressed (Vus~0.2)● Resonant is saturating

! excluding , upper limit Br < 2.5 x 10–6

● consistent with BellePhys. Lett B643(2006)5

Decays with final state

Hadronic Decays with Hadronic Decays with

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peak in KKK-K+K-

● BABAR342 fb–1

Phys.Rev.Lett.100(2008)011801 ● First measurement of

– ! K+ K– –

Br = (3.42§0.55§0.25) x 10-5

● OZI suppressed

● BABAR342 fb–1

Phys.Rev.Lett.100(2008)011801 ● First measurement of

– ! K+ K– –

Br = (3.42§0.55§0.25) x 10-5

● OZI suppressed

Decays with final state

Hadronic Decays with Hadronic Decays with

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Summary

● Results from Belle and Babar presented forDs1(2536), DsJ(2700), DsJ(2860), c**, Ds ! , fDs

Hadronic decays with and final states

Thank you for your attention.

● Results from Belle and Babar presented forDs1(2536), DsJ(2700), DsJ(2860), c**, Ds ! , fDs

Hadronic decays with and final states

Thank you for your attention.

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Backup SlidesBackup Slides

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Ds+ ! + analysis technique

● Analysis technique:● full reconstruction

e+ e– ! Ds* D,0 K,0Xwhere X=n and · 1

● Tag side:DK, with D ! K n, n=1,2,3

● Signal side:Ds

* ! Ds (reconstructed in the recoilagainst DKX)

● In the Ds sample● Require 1 ● Use Ds ! e e

as background shape(expected Br factor ~105 smaller)

● Analysis technique:● full reconstruction

e+ e– ! Ds* D,0 K,0Xwhere X=n and · 1

● Tag side:DK, with D ! K n, n=1,2,3

● Signal side:Ds

* ! Ds (reconstructed in the recoilagainst DKX)

● In the Ds sample● Require 1 ● Use Ds ! e e

as background shape(expected Br factor ~105 smaller)

32100 § 1490 inclusive Ds decays

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Ds+ ! + Reconstruction Method

Lau

ran

z W

idh

alm

, H

EP

HY

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Ds+ ! , Comparison of Analyses

Belle• Efficiency depends strongly on

number of pions

• p*(D)>2.0 GeV/c• p*(Ds)>3.0 GeV/c• p*(K) < 2.0 GeV/c

Elab()>150 MeV• Mass-constrained vertex fit

for Ds* and Ds

Belle• Efficiency depends strongly on

number of pions

• p*(D)>2.0 GeV/c• p*(Ds)>3.0 GeV/c• p*(K) < 2.0 GeV/c

Elab()>150 MeV• Mass-constrained vertex fit

for Ds* and Ds

Babar● Efficiency cancels in partial

width ratio (Ds

+!+)/ (Ds+!+)

● p*(+ )>1.2 GeV/c● *>38o

● |p(Ds*+)| cut

● E*>115 MeV

● cos(,D)<0.9

● Emiss* cut

Babar● Efficiency cancels in partial

width ratio (Ds

+!+)/ (Ds+!+)

● p*(+ )>1.2 GeV/c● *>38o

● |p(Ds*+)| cut

● E*>115 MeV

● cos(,D)<0.9

● Emiss* cut

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Ds+ ! , Comparison of Backgrounds

Belle• MC studies show• Non-Ds decays ~18%• Leptonic decays ~7%

( ! )• Semileptonic Ds decays ~3.6%

with undetected low p hadrons• Hadronic Ds decays <2%

Belle• MC studies show• Non-Ds decays ~18%• Leptonic decays ~7%

( ! )• Semileptonic Ds decays ~3.6%

with undetected low p hadrons• Hadronic Ds decays <2%

Babar● e+ e– ! f anti-f

with no charmor incorrect tag ~42%

• Leptonic decays ~26%( ! )

• Pure leptonic D! or Ds! missing the signal chain~20%

• Other backgrounds• charged misidentified as

~1%• incorrectly chosen

candidate ~10%

Babar● e+ e– ! f anti-f

with no charmor incorrect tag ~42%

• Leptonic decays ~26%( ! )

• Pure leptonic D! or Ds! missing the signal chain~20%

• Other backgrounds• charged misidentified as

~1%• incorrectly chosen

candidate ~10%

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fD

● fD+=222.6§16.7 +2.8–3.4 MeV

CLEOfor 47§7 D+!+ eventsPhys. Rev. Lett. 95(2005)251801

● Lattice fD+=208§4 MeV

● fD+=222.6§16.7 +2.8–3.4 MeV

CLEOfor 47§7 D+!+ eventsPhys. Rev. Lett. 95(2005)251801

● Lattice fD+=208§4 MeV

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fB – Lattice QCD vs. Experiment

● BellePhys.Rev.Lett. 97 (2006)251802 hep-ex/0604018v3414 fb-1

● Br(B- ! – tau) = (1.79 +0.56

–0.49(stat) +0.46

–0.51(syst))*10–4

● This implies that fB = 0.229 +0.036

–0.031(stat) +0.034

–0.037(syst) GeV

● BellePhys.Rev.Lett. 97 (2006)251802 hep-ex/0604018v3414 fb-1

● Br(B- ! – tau) = (1.79 +0.56

–0.49(stat) +0.46

–0.51(syst))*10–4

● This implies that fB = 0.229 +0.036

–0.031(stat) +0.034

–0.037(syst) GeV

● The B meson decay constant from unquenched lattice QCDHPQCD CollaborationAlan Gray et al. Phys.Rev.Lett. 95(2005)212001hep-lat/0507015

● The B meson decay constant from unquenched lattice QCDHPQCD CollaborationAlan Gray et al. Phys.Rev.Lett. 95(2005)212001hep-lat/0507015

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Status of Charmed BaryonsR. MizukarXiv:0712.0310

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Charmed Baryon 5/2 States

● Rosner et al.hep-ph/0612332

● L ' 300 MeV

● Rosner et al.hep-ph/0612332

● L ' 300 MeV 2880!D0p

2940!D0p

3122307730552980

c(2880)+ ! c(2455)0,+++,−

5/2+

5/2-

Belle

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Possible transitions in c system

● hep-ph/0610283Chen and Chui

● L is orbital momentumof light quark

● hep-ph/0610283Chen and Chui

● L is orbital momentumof light quark

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G. Marchiori, NOW 2006

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D**

• assume heavy quark symmetrymcharm

• light quark couples to L first

• thenL=1 states are 2 doublets

jq=1/2broad (decay by S wave)

jq=3/2narrow (decay by D wave)

• assume heavy quark symmetrymcharm

• light quark couples to L first

• thenL=1 states are 2 doublets

jq=1/2broad (decay by S wave)

jq=3/2narrow (decay by D wave)

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D**

• BELLE observes the two broad D** (jq=1/2) L=1 statesPhys. Rev. D69(2004)11200265.4 Mill. BB

• mass widthD*0(J=0) 2308171528 MeV 276211860 MeV D´1(J=1) 2427262015 MeV 384+107

-752470 MeV

• BELLE observes the two broad D** (jq=1/2) L=1 statesPhys. Rev. D69(2004)11200265.4 Mill. BB

• mass widthD*0(J=0) 2308171528 MeV 276211860 MeV D´1(J=1) 2427262015 MeV 384+107

-752470 MeV

D2* can decay to D and D*

D+K+

D*+Do+

DoK+

DoK++

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Confirmation of new DsJ States

• BELLE confirmed bothand observed DsJ

+(2460)Ds+ Phys. Rev. Lett. 92(2004)012002

• seen in both production mechanisms• e+ecc• B decay > important for determination of quantum number

• BELLE confirmed bothand observed DsJ

+(2460)Ds+ Phys. Rev. Lett. 92(2004)012002

• seen in both production mechanisms• e+ecc• B decay > important for determination of quantum number

not Ds* !

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DsJ quantum numbers

• observation in B decays enables helicity analysis (fixed initial state)

• observation in B decays enables helicity analysis (fixed initial state)

JP=0+

JP=1-

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Compare D and Ds systems

• should be similar (except smaller mass splitting jq=1/23/2 due to s quark mass)

• why are the Ds jq=1/2 states narrow (and the D states broad) ?isospin violation (from I=0 to I=1)

• but measured DsJ masses >100 MeV lower than potential model

• should be similar (except smaller mass splitting jq=1/23/2 due to s quark mass)

• why are the Ds jq=1/2 states narrow (and the D states broad) ?isospin violation (from I=0 to I=1)

• but measured DsJ masses >100 MeV lower than potential model

Theory

Experiment

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Mixing for Ds12460 from CLEO

● Exp. knowledge on the mixing: • from BF’s ratio of Ds1(2460) radiative decays:

D*sγ/Dsγ=0.31±0.14

• switch from |jq> to |2S+1LJ > basis • tan2(θ+θ0)=0.8±0.4 where tan2θ0=2 (no-mixing case)

● Exp. knowledge on the mixing: • from BF’s ratio of Ds1(2460) radiative decays:

D*sγ/Dsγ=0.31±0.14

• switch from |jq> to |2S+1LJ > basis • tan2(θ+θ0)=0.8±0.4 where tan2θ0=2 (no-mixing case)

θ θ0

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L. Cremaldi

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c Fragmentation

● 1st indication of different fragmentation of charmed mesons (cq) and charmed baryons (cqq)

● BabarPRD 75, 012003 (2007)9.5 fb-1 off-resonance

● BellePhys. Rev. D73(2006) 03200215 fb-1 off-resonance

● 1st indication of different fragmentation of charmed mesons (cq) and charmed baryons (cqq)

● BabarPRD 75, 012003 (2007)9.5 fb-1 off-resonance

● BellePhys. Rev. D73(2006) 03200215 fb-1 off-resonance

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Brief History of Ds and DsJ

● Ds(1968), CLEO, 1983● Ds*(2112), Mark3, 1987● Ds*(2536), ARGUS, 1989

(even before indication in N)● DsJ

+(2317) ! Ds

+ 0 Babar 03, 91 fb–1

Phys.Rev.Lett.90(2003)242001continuum

● DsJ+(2463)

! Ds*(2112) 0

CLEO 03,Phys.Rev. D68(2003)032002continuum 13.5 fb only

● Ds(1968), CLEO, 1983● Ds*(2112), Mark3, 1987● Ds*(2536), ARGUS, 1989

(even before indication in N)● DsJ

+(2317) ! Ds

+ 0 Babar 03, 91 fb–1

Phys.Rev.Lett.90(2003)242001continuum

● DsJ+(2463)

! Ds*(2112) 0

CLEO 03,Phys.Rev. D68(2003)032002continuum 13.5 fb only

● BABARPhys.Rev.D69:031101,2004DsJ(2463) ! Ds 0

● BellePhys.Rev.Lett. 91(2003)262002in B decays! helicity study

● Belle 86.9 fbDsJ(2463)+ ! Ds+ ! Ds

+ + -(OZI suppressed)Phys.Rev.Lett. 92(2004)012002

● BABARPhys.Rev.D69:031101,2004DsJ(2463) ! Ds 0

● BellePhys.Rev.Lett. 91(2003)262002in B decays! helicity study

● Belle 86.9 fbDsJ(2463)+ ! Ds+ ! Ds

+ + -(OZI suppressed)Phys.Rev.Lett. 92(2004)012002

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Partial Wave Analysis of Partial Wave Analysis of DDs1s1(2536)(2536)→→D*D*++KK00s s (resonant)

hep-ex/0709.4184 PRD 77(2008)032001

● Prediction for 1+ state in the helicity formalism● ρ helicity density matrix

angles , , ρ00 longitudinal polarization z=√RΛ exp(iξ)=A10/A00

A10=(S+D/√2)/√3 A00=(S-√2D)/√3) D/S= √2(z-1)/(1+2z)

● Prediction for 1+ state in the helicity formalism● ρ helicity density matrix

angles , , ρ00 longitudinal polarization z=√RΛ exp(iξ)=A10/A00

A10=(S+D/√2)/√3 A00=(S-√2D)/√3) D/S= √2(z-1)/(1+2z)

Ds1(2536)DsJ(2700)Ds ! Charmed Baryons c

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Fit to angular distribution of Fit to angular distribution of DDs1s1(2536)(2536)→→D*D*++KK00ss

● fbck: background fraction in M(D*+Ks) signal region: ~9%● ε(α,β,γ)/<ε> → efficiency correction

● fbck: background fraction in M(D*+Ks) signal region: ~9%● ε(α,β,γ)/<ε> → efficiency correction

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● b →ccs tree process, i.e. cs→D0K+ and cc→D0D0 final states● Signal identification ΔE=EB-Ebeam

cms energy difference Mbc= √(E2

beam-p2B)

beam-constrained mass● S=399±40 for 449MBB events● Dalitz plot different

from 3-body phasespace

● b →ccs tree process, i.e. cs→D0K+ and cc→D0D0 final states● Signal identification ΔE=EB-Ebeam

cms energy difference Mbc= √(E2

beam-p2B)

beam-constrained mass● S=399±40 for 449MBB events● Dalitz plot different

from 3-body phasespace

New DNew DsJsJ meson in meson in BB++→→DD00DD00KK++

ΔΔEE MMbcbc

hep-ex/0707.3491 hep-ex/0707.3491

(submitted to PRL)(submitted to PRL)

(4160)(3770)

new DsJ

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Chiral effective theory with heavy quark symmetry

● Matsuki, Morii, SudohPhys.Lett. B659(2008)593, arXiv:0710.0325 

● influenced by earlier work Bardeen et al., Phys.Rev. D68(2003)054024

● k: quantum number of spinor operator● might explain lower masses DsJ(2317) and DsJ(2460)

● Matsuki, Morii, SudohPhys.Lett. B659(2008)593, arXiv:0710.0325 

● influenced by earlier work Bardeen et al., Phys.Rev. D68(2003)054024

● k: quantum number of spinor operator● might explain lower masses DsJ(2317) and DsJ(2460)

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Mixing in the D system

● D1’-D1 mixing angle measured from B→D*ππ Dalitz plotBelle Phys. Rev. D69(2004)11200259 fb-1

● Mixing angle between axialvector 1+ states D1’ and D1

=(-0.10±0.03±0.02±0.02 rad)

● Note: here one broad and and narrow state(in Ds system both 1+ states are narrow)

● D1’-D1 mixing angle measured from B→D*ππ Dalitz plotBelle Phys. Rev. D69(2004)11200259 fb-1

● Mixing angle between axialvector 1+ states D1’ and D1

=(-0.10±0.03±0.02±0.02 rad)

● Note: here one broad and and narrow state(in Ds system both 1+ states are narrow)

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Mass splitting of c* states (u vs. d quark)

Belle, hep-ex/0802.3968, subm. to Phys. Lett. BBelle, hep-ex/0802.3968, subm. to Phys. Lett. B

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HOWTO measured an absolute Ds Br ?

● Example e+e- ! Ds*+ Ds1–, hep-ex/0701053

with Ds1– ! anti-D* K

● 2 tags● Tag #1: full reco of Ds1

– and from Ds* ! Ds= proportional to yield of reconstructed anti-D* modes

● Tag #2: full reco of Ds*+ through only (Ds*+ ! Ds+ )and observation of K from Ds1 ! anti-D* Kproportional to Br of Ds+

● Efficiency corrected ratio of the 2 measured signal yields= ratio of well known anti-D* Br and the searched-for Br of Ds+

● For efficiency: MC

● Example e+e- ! Ds*+ Ds1–, hep-ex/0701053

with Ds1– ! anti-D* K

● 2 tags● Tag #1: full reco of Ds1

– and from Ds* ! Ds= proportional to yield of reconstructed anti-D* modes

● Tag #2: full reco of Ds*+ through only (Ds*+ ! Ds+ )and observation of K from Ds1 ! anti-D* Kproportional to Br of Ds+

● Efficiency corrected ratio of the 2 measured signal yields= ratio of well known anti-D* Br and the searched-for Br of Ds+

● For efficiency: MC

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DsJ Spectroscopy

E. Prencipe, MENU2007

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Event Selection I

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Event Selection II

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