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

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

Moriond QCD, March 9, 2008

2

Charm DecaysTau Decays

Sören Lange

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


Decays




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Nucl. Instr. Meth. A479(2002)1

Integrated Luminosity 512.2 fb–1

Nucl. Instr. Meth. A479(2002)1


Nucl. Instr. Meth A479(2002)117


Nucl. Instr. Meth A479(2002)117



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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



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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



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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)



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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


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)



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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


(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+



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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?


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

DsJ(2700)?

DsJ(2860)


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Ds+!+

Ds+!+


● 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



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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?



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Charmed Baryons:Studies of the c system

Charmed Baryons:Studies of the c system

c c c 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



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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)


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+)


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



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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)



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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




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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


–



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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)



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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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Documents

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