New Resonances from B-New Resonances from B-factories factories

J. Brodzicka (KEK) for BelleJ. Brodzicka (KEK) for BelleKEKTH’07, TsukubaKEKTH’07, Tsukuba

A lot of states, a lot of production A lot of states, a lot of production processes…processes…

J. Brodzicka for Belle @ KEKTH’07J. Brodzicka for Belle @ KEKTH’07

•ee++ee-- annihilation i.e. double c annihilation i.e. double ccc

production eproduction e++ee--→J/→J/ψψXXcccc

•γγγγ collision e collision e++ee--→→γγγγ→→XXcccc→D→DDD

B-Factories are Charmonium B-Factories are Charmonium factoriesfactories

• B meson decays i.e. BB meson decays i.e. B→X→Xcccc KK((**))

• ee++ee-- radiative return (ISR) radiative return (ISR)

ee++ee--→→γγISRISRXXcccc →→γγISRISR J/ J/ψππψππ

J. Brodzicka for Belle @ KEKTH’07J. Brodzicka for Belle @ KEKTH’07

e+ J/ψ

X

e-

c γ * c c c

B X W

K(*)

b c u, d c

s u, d

e+

e-

ππ ππ

J/J/ψψ

γγISRISR γ*

X

cccc (-like) production mechanisms @ B-Factory (-like) production mechanisms @ B-Factory

e+ e+

e- e-

X D D

γ

γ

J. Brodzicka for Belle @ KEKTH’07J. Brodzicka for Belle @ KEKTH’07

A lot of data from KEK-B Factory…A lot of data from KEK-B Factory… Asymmetric e+e- collider Tsukuba

e+: 3.5 GeV e-: 8.0 GeV

CM energy: 10.58 GeV at (4S)

e+e- (4S) BB Advantages:

exclusive source of BB pairs useful kinematical constraints high signal-to-background ratio separation of B decay vertices

Record luminosity peak: 1.711034cm-2s-1

Integrated luminosity: ~750 fb-1

~ 780 * 106 BB

~ 960 * 106 cc Beauty and Charm Factory

Silicon Vertex Detector KL / Detector

SC Solenoid 1.5T

Central Drift Chamber

Aerogel Cherenkov

Counter

Electromagnetic Calorimeter

Time of Flight Counter

……recorded with the Belle detectorrecorded with the Belle detector J. Brodzicka for Belle @ KEKTH’07J. Brodzicka for Belle @ KEKTH’07

8 GeV e-

3.5 GeV e+

Particle identificationParticle identificationK/ separation Central Drift Chamber:

dE/dx Aerogel Cherenkov Counter Time of Flight Counter Electron identification Electromagnetic Calorimeter

KL and identification KL and muon detector

VertexingVertexing Silicon Vertex Detector

Event reconstructionEvent reconstructionCharged tracksCharged tracks Central Drift Chamber Silicon Vertex DetectorElectrons and photons Electromagnetic Calorimeter

• BB→X→Xcccc KK((**)) decays used:

• b→cW→ccs is dominant process (exclusive BF ~10-3) • background reduction is possible

• JP of parent B is known → JP of the child particles can be

determined from angular analysis • J=0, 1 states should dominate (if factorization assumed)

B decays as a charmonium-like B decays as a charmonium-like factoryfactory

J. Brodzicka for Belle @ KEKTH’07J. Brodzicka for Belle @ KEKTH’07

b c u, d c

s K(*)

u, d

B charmonium (-like)

W η, χc, J/ψ, ψ’… Good place for spectroscopy study!Cabbibo-favored

vertices

How to identify B meson signalHow to identify B meson signal

• We take advantage of e+e-→(4S) → BB kinematics m(4S)~ mB + mB no accompanying particles

→ EB=Ebeam=√s/2 in cms • kinematical variables used in B-Factories Mbc= √E2

beam- p2B

beam-constrained mass

(signal at mB~5.28GeV)

ΔE=EB - Ebeam

cms energy difference

(signal peaks at 0)

• Resolution improvement Resolution improvement

((Ebeam is precisely known)is precisely known)

• Background separationBackground separation

J. Brodzicka for Belle @ KEKTH’07J. Brodzicka for Belle @ KEKTH’07

Mbc ΔE

Mbc

ΔE

Example: B0→ J/ψ KS

Reminder on X(3872)Reminder on X(3872) • X(3872)→J/ψπ+π- observed in B+→X(3872)K+ by Belle

• confirmed by BaBar, CDF, D0

J. Brodzicka for Belle @ KEKTH’07J. Brodzicka for Belle @ KEKTH’07

PRL91, 262001 (2003)

X(3872)→J/ψππ

Ψ(2S)→J/ψππ

117M

BB

M(J/ψπ+π-)

152M BBBF(B→KX)*BF(X→J/ψππ) = (1.3±0.2±0.1)*10-5

Properties of X(3872)Properties of X(3872)• mX=3871.2 ± 0.5MeV ≈ mD*0+mD0 (PDG06)

• narrow: Γ<2.3MeV• above DD threshold but no X→DD found PRL93, 051803

(2004)

• M(M(π+π-) is like ) is like ρρ(770), (770), so so X(3872)→J/ψρ?• Other decay modes: Other decay modes: J/ψγ, J/ψω

• Favored JFavored JPCPC= = 1++ (angular analysis by Belle/CDF, decay modes)

What is X(3872)?What is X(3872)?• cccc? ? Does not match any cDoes not match any ccc predicted by quark models predicted by quark models

• DD* molecule? mDD* molecule? mXX-(m-(mD*D*00+m+mDD00)= -0.6±0.6 MeV above/below )= -0.6±0.6 MeV above/below DD*? DD*?

• 4-quark? 4-quark? Would explain small width. Charged X should existWould explain small width. Charged X should exist

J. Brodzicka for Belle @ KEKTH’07J. Brodzicka for Belle @ KEKTH’07

M(π+π-)

Is X(3872) a cIs X(3872) a ccc state ? state ? J. Brodzicka for Belle @ KEKTH’07J. Brodzicka for Belle @ KEKTH’07

• Study of X(3872)→J/ψπ+π- in B+→XK+ and B0→XK0s (657M BB)

• control sample: B→ψ’K ψ’→J/ψππ to calibrate mass & resolution

• after Mbc and ΔE selection:

• similar properties of X(3872) from B+ and B0 decays (this disfavors some theoretical models)

X(3872)X(3872) in Bin B++ and B and B00 decays decaysJ. Brodzicka for Belle @ KEKTH’07J. Brodzicka for Belle @ KEKTH’07

BELLE-CONF-0711

B+→XK+ Ns=125±14 (12σ)

657M BB

M(J/ψπ+π-)

B0→XK0s

Ns=30±7 (6.5σ)

First observation!

M(J/ψπ+π-)

X(3872)X(3872)→DD*→DD* J. Brodzicka for Belle @ KEKTH’07J. Brodzicka for Belle @ KEKTH’07

• X(3872) is very close to D*0D0 threshold

• BaBar: B+→D*0D0K D*0 →D0π0,D0γ (383M BB)

• Belle: B+→D0D0 π0K (447M BB)

• mass ~4σ above M(X) for X→J/ψππ

• are there two states X(3872) and X(3875)?

hep-ex/0708.1565

PR

L97, 162002(2006)

M(X)=3875.1+0.7-0.5 ±0.5 MeV

Γ=3.0+1.9-1.4 ± 0.9 MeV

M(X)=3875.4 ± 0.7+0.4-1.7 ±0.9 MeV

N=24±6 (6.4σ)N=33±7 (4.9σ)

What is X(3872)?What is X(3872)?

• 4-quark model: Xu [uc][uc] state decaying to D0D0π0 = X(3875)

Xd [dc][dc] state decaying to J/Ψπ+π- = X(3872)

Finding charged partner is critical

• Molecule model: X is D*0D0 bound state (mmXX ≈ m ≈ mD*D*00+ m+ mDD00) Favors DDFavors DDππ over J/ over J/ψππψππ

Line shape depends on the decay channelLine shape depends on the decay channel

• X(3872) properties still under investigation (mass, width, line shape, decay modes…)

J. Brodzicka for Belle @ KEKTH’07J. Brodzicka for Belle @ KEKTH’07

Maiani, Polosa et al.

hep-ph/0707.3354

Braaten et al.

hep-ph/0710.5482

u cuc

Xu=d c

dcXd=

Recently…Recently… J. Brodzicka for Belle @ KEKTH’07J. Brodzicka for Belle @ KEKTH’07

Observation of ZObservation of Z++(4430)(4430)→→ψψ’’ππ++

• Belle studied B0 →ψ’π+K- and B+→ψ’π+K0s (657M BB)

• ψ’→ e+e-, μ+μ- or J/ψπ+π- J/ψ →e+e-, μ+μ- • secondary particles combined to B→ψ’π+K candidates

• Mbc and ΔE selection: clear B→ψ’π+K signal

J. Brodzicka for Belle @ KEKTH’07J. Brodzicka for Belle @ KEKTH’07

hep-ex/0708.1790

Submitted to PRL

• in B→ψ’π+K Dalitz plot:

K*→π+K states and a clear band at M2(ψ’π+)~20GeV2

• K*veto applied to study of ψ’π+ (both K* regions excluded)

• M(ψ’π+) fit: Breit-Wigner + ph.space like function

prominent peak

(K* veto applied)

3-

body decays

non-B

background

Observation of ZObservation of Z++(4430)(4430)→→ψψ’’ππ++J. Brodzicka for Belle @ KEKTH’07J. Brodzicka for Belle @ KEKTH’07

M2 (

ψ’π

+)

M2(Kπ+)

K*(890)

K2*(1430)

???

M(ψ’π+)

M= 4433 ± 4 MeV Γ= 45+18-13 MeV

Z+(4430)

N =121±30 (6.5σ)

Z(4430) signal is robust: B generic MC studied → Z(4430) is not a reflection data subsets checked, K* veto changed interference between Kπ partial waves (S,P,D)

→ cannot produce such narrow peak in ψ’π+

BF(B→KZ)*BF(Z→ψ’π+) = (4.1 ±1.0±1.4 )*10-5

JP not determined, statistics too low

First candidate for a charged cc-like state! Must be exotic!

Z(4430) could be a tetraquark state [cu][cd] (Charged states naturally appear in 4-quark models)

Radial excitation of X(3872/5) family?

ZZ++(4430) (4430) →→ψψ’’ππ++J. Brodzicka for Belle @ KEKTH’07J. Brodzicka for Belle @ KEKTH’07

Z+(4430)

Maiani, Polosa et al.

hep-hp/0708.3997

M= 4433 ± 4 ± 2 MeV Γ= 45 MeV+18 +30–13 -13

Y(3940)Y(3940)→J/→J/ψωψω from Belle from Belle

• Study of BStudy of B→ → KJ/KJ/ψωψω (275M B(275M BBB))• J/J/ψψ→→ee, ee, μμμμ ω→πω→π++ππ--ππ00 • MMbcbc , , ΔΔE and M(E and M(ππ++ππ--ππ00) selection ) selection • M(M(ωωK)>1.6GeV: K* vetoK)>1.6GeV: K* veto

• Y is above DY is above DDD threshold but has large c threshold but has large ccc transition transition• Candidate for cCandidate for ccc-gluon hybrid? -gluon hybrid? (but hybrids predicted above 4GeV)(but hybrids predicted above 4GeV)

J. Brodzicka for Belle @ KEKTH’07J. Brodzicka for Belle @ KEKTH’07

PRL 94, 182002 (2005)

Y(3940) Y(3940)

M(M(ωωJ/J/ψψ))

N=58±11N=58±11

MM22((ωωK)K)

MM22(( ωω

J/J/ψψ

))

K*’sK*’s

M= 3943±11±13 M= 3943±11±13 MeVMeV

ГГ=87±22±26 MeV=87±22±26 MeV

BF(BF(BB→→KKYY)*BF(Y→J/)*BF(Y→J/ψωψω))

=(7.1±1.3±3.1)*10=(7.1±1.3±3.1)*10-5-5

• Similar study of BSimilar study of B→ → KJ/KJ/ψωψω (383M B(383M BBB) ) • But events weighted according to helicity But events weighted according to helicity distribution expected for distribution expected for ω→πω→π++ππ--ππ00 (~sin(~sin22θθ)) (projects the signal, reduces background)(projects the signal, reduces background)• Fit to acceptance corrected M(J/Fit to acceptance corrected M(J/ψωψω) )

• M= 3914 ±4 ±2 MeV M= 3914 ±4 ±2 MeV ГГ= 33 ±5 MeV = 33 ±5 MeV mass and width smaller mass and width smaller

than Y(3940) from than Y(3940) from BelleBelle

BF(BF(BB++→→KK++YY)*BF(Y→J/)*BF(Y→J/ψωψω)=(4.9±1.0±0.5)*10)=(4.9±1.0±0.5)*10-5-5

BF(BF(BB00→→KK00YY)*BF(Y→J/)*BF(Y→J/ψωψω)<3.9*10)<3.9*10-5-5

Y(3940) confirmed by BaBarY(3940) confirmed by BaBar J. Brodzicka for Belle @ KEKTH’07J. Brodzicka for Belle @ KEKTH’07

hep-ex/0711.2047

submitted to PRL

+12 – 8

M(M(J/J/ψωψω))

B+→K+ J/ψω B0→K0 J/ψω

M(M(J/J/ψωψω))

Mbc

ΔE

M(π+π-π0)

Double cDouble ccc production: e production: e++ee--→→J/J/ψψ(c(ccc))resres

• Factory of 0Factory of 0++++ and 0 and 0--++ charmonia charmonia• Method: reconstruct J/Method: reconstruct J/ψψ, , study recoil mass study recoil mass

MMrecoilrecoil(J/(J/ψψ) =) =√(E√(Ecmcm-E -E J/J/ψψ))22 -p -p22 J/J/ψψ

• Surprises: Surprises: below Dbelow DDD: c: ccc states with large x-sections states with large x-sections O(10-20fb)O(10-20fb) above Dabove DDD: : new state X(3940)new state X(3940)

• Method is limited: Method is limited: σσ~30MeV; remainder system not ~30MeV; remainder system not reconstructed reconstructed → its identification indirect→ its identification indirect

J. Brodzicka for Belle @ KEKTH’07J. Brodzicka for Belle @ KEKTH’07

PRL 98, 082001 (2007)

e+ J/ψ

X

e-

c γ * c c c

N=266N=266±63 (5±63 (5σσ))M=3936±14 MeV M=3936±14 MeV ΓΓ=39±26 MeV=39±26 MeV

one state or more?one state or more?357fb-1

BF(X(3940)BF(X(3940)J/J/ψψωω)<26%)<26% @90%CL@90%CL so X(3940) it’s not so X(3940) it’s not Y(3940)Y(3940)

Double cDouble ccc production: e production: e++ee--→→J/J/ψψ DD((**))DD((**))

• DD((**))DD((**)) resonances through e resonances through e++ee-- →→J/J/ψψ D D((**))DD((**))

• Reconstruct J/Reconstruct J/ψψ and one D and one D((**)) , study M , study Mrecoilrecoil(J/(J/ψψDD((**) ) ) )

• Associated DAssociated D((**)) seen as peak in M seen as peak in Mrecoilrecoil(J/(J/ψψDD((**))) )

• Tagged processes: J/Tagged processes: J/ψψDDDD , , J/J/ψψDDDD** , J/ , J/ψψD*D*DD** (all >5 (all >5σσ))

J. Brodzicka for Belle @ KEKTH’07J. Brodzicka for Belle @ KEKTH’07

hep-ex/0708.3812

submitted to PRL

693fb-1

Mrec(J/ψD)

Mrec(J/ψD*)

DD D*D* D*D*ππ

DD D*D*

Double cDouble ccc production: e production: e++ee--→→J/J/ψψ DD((**))DD((**))

• Constrain MConstrain Mrecoilrecoil(J/(J/ψψDD((**))) from the peak regions ) from the peak regions

to the nominal mass of to the nominal mass of associated Dassociated D((**)) • Tagged & constrained: eTagged & constrained: e++ee--→J/→J/ψψ D D((**))DD((**))

so Mso Mrecoilrecoil(J/(J/ψψ) = M(D) = M(D((**))DD((**))))

J. Brodzicka for Belle @ KEKTH’07J. Brodzicka for Belle @ KEKTH’07

•M(DM(DDD) is not non-resonant ) is not non-resonant •one broad resonance or one broad resonance or more?more?•fit unstable, significance lowfit unstable, significance low•remains inconclusiveremains inconclusive

ee→J/ee→J/ψψ DDDD

Mrec(J/ψD)

M(DM(DDD))

DD D*D* D*D*ππ

• X(3940)X(3940)→D→DDD** visible in inclusive M visible in inclusive Mrecoilrecoil(J/(J/ψψDD))

• X(4160) X(4160) →D*→D*DD** one more particle one more particle (C=+1 so it’s not (C=+1 so it’s not ψψ(4160))(4160))

• Possible assignments: Possible assignments: ηηcc(3S) (3S) ηηcc(4S)(4S)

ee→J/ee→J/ψψ DD**D*D*

X(4160) 5.5X(4160) 5.5σσ

M(D*M(D*DD*)*)

ee→J/ee→J/ψψ DDD*D*

X(3940) 6.0X(3940) 6.0σσ

M(D*M(D*DD))

X(3940) and X(4160)X(3940) and X(4160) J. Brodzicka for Belle @ KEKTH’07J. Brodzicka for Belle @ KEKTH’07

N = 52

M =3942 ± 6 MeV

=37 ± 12 MeV

+7–6

+26 –15

+24 –16 N = 24

M = 4156 ± 15 MeV

= 139 ± 21 MeV

+25–20

+111 – 61

+12 – 8

Mrec(J/ψD) DD D*D* D*D*ππ DD D*D* Mrec(J/ψD*)

Y family from ISR studiesY family from ISR studies J. Brodzicka for Belle @ KEKTH’07J. Brodzicka for Belle @ KEKTH’07

PRL 95, 142001 (2005)

for 232fb-1

M = 4259 ± 8 MeV

= 88 ± 23 MeV

(Y→ee)*B(Y→J/→J/ψππψππ)=5.5± 1.0 eV

+2–6

+6 –4

+0.8 –0.7

PRL 98, 212001 (2007)

for 298fb-1

Y(4350)Y(4350)→→ψψ’’ππππ

Y(4260)Y(4260)→J/→J/ψππψππ

CLEO PRD74, 091104 (2006)CLEO-c PRL 96, 162003 (2006)for 13pb-1@4.26GeV

YY→J/→J/ψππψππ via ISR via ISR

• ISR gives access to JISR gives access to JPCPC=1=1---- states states• Study of eStudy of e++ee--→J/→J/ψπψπ++ππ- - γγISRISR (548 fb(548 fb-1-1))

• Selection: J/Selection: J/ψψ→ee, →ee, μμμμ + + ππππ; no extra tracks; no extra tracks• ISR photon is not detected ISR photon is not detected • Missing mass used to identify processMissing mass used to identify process• In M(In M(J/J/ψππψππ): ): ψψ’ signal and ’ signal and twotwo clusters clusters

of events of events

J. Brodzicka for Belle @ KEKTH’07J. Brodzicka for Belle @ KEKTH’07

PRL 99, 182004 (2007)

e+

e-

ππ ππ

J/J/ψψ

γγISRISR γ*

X

ΨΨ’’

Y(4260)Y(4260)

YY→J/→J/ψππψππ via ISR via ISR • Fit to M(Fit to M(J/J/ψππψππ) with ) with two interfering Breit-Wignerstwo interfering Breit-Wigners • Two solutions Two solutions (destructive/constructive interference)(destructive/constructive interference)

• Y(4260)Y(4260) confirmed confirmed • Y(4008)Y(4008) broad state? Re-scattering from DD*? broad state? Re-scattering from DD*?

Coupled-channel effect? Non-resonant component?Coupled-channel effect? Non-resonant component?

J. Brodzicka for Belle @ KEKTH’07J. Brodzicka for Belle @ KEKTH’07

PRL 99, 182004 (2007)

Y(4260)Y(4260)

Y(4008)Y(4008)

J/J/ψππψππ from ISR studiesfrom ISR studies • Using ISR we can measure hadronic x-sections Using ISR we can measure hadronic x-sections

in wide energy range in wide energy range • Model independent measurementModel independent measurement• M(J/M(J/ψππψππ)): background subtracted, corrected for efficiency : background subtracted, corrected for efficiency

and luminosity → and luminosity → Cross-section for Cross-section for ee++ee--→J/→J/ψπψπ++ππ- -

J. Brodzicka for Belle @ KEKTH’07J. Brodzicka for Belle @ KEKTH’07

YY→→ψψ’’ππππ via ISR via ISR

• Belle studied eBelle studied e++ee--→→ψψ’’ππ++ππ- - γγISRISR (673 fb(673 fb-1-1))

• ψψ’’→J/→J/ψππψππ,, J/ J/ψψ→ee, →ee, μμμμ + + ππππ; no extra tracks; no extra tracks• γγISRISR not detected not detected• Very low backgroundVery low background• Two significant peaks observed in M(Two significant peaks observed in M(ψψ’’ππππ)) • One close to Babar’s Y(4360) but more narrowOne close to Babar’s Y(4360) but more narrow

J. Brodzicka for Belle @ KEKTH’07J. Brodzicka for Belle @ KEKTH’07

PRL 99, 142002 (2007)

Y(4360) newY(4360) new

YY→→ψψ’’ππππ via ISR via ISR • M(M(ψψ’’ππππ)) fitted with fitted with two coherent Breit-Wignertwo coherent Breit-Wigner functions functions• Two solutions Two solutions (for destructive/constructive interference)(for destructive/constructive interference)

J. Brodzicka for Belle @ KEKTH’07J. Brodzicka for Belle @ KEKTH’07

Y(4360)Y(4360)

Y(4660)Y(4660)

PRL 99, 142002 (2007)

ee++ee--→J/→J/ψψKKKK via via ISR ISR

• Belle studies eBelle studies e++ee--→J/→J/ψψKKKK γ γISRISR (673fb(673fb-1-1))

• First observation of eFirst observation of e++ee--→J/→J/ψψKK++KK-- γ γISRISR

and evidence for eand evidence for e++ee--→J/→J/ψψKsKsKsKs γ γISRISR• M(M(J/J/ψψKK) inconclusiveKK) inconclusive

J. Brodzicka for Belle @ KEKTH’07J. Brodzicka for Belle @ KEKTH’07

hep-ex/0709.2565

to appear in PRD

1 1 - -- - Y states via ISR Y states via ISR

• ll

J. Brodzicka for Belle @ KEKTH’07J. Brodzicka for Belle @ KEKTH’07

J/

J/

’

Y(4260)Y(4260)Y(4008)Y(4008)

Y(4660)Y(4660)Y(4360) Y(4360)

Do Y states decay to Do Y states decay to DD((**))DD((**)) ? ?• All Y states above DAll Y states above DDD, should decay to D, should decay to D((**))DD((**))

• Y states do not match well to peaks in hadronic x-Y states do not match well to peaks in hadronic x-sectionssections

• This means large partial widths to This means large partial widths to ψππψππ (unlike for (unlike for ordinary cordinary ccc))

J. Brodzicka for Belle @ KEKTH’07J. Brodzicka for Belle @ KEKTH’07

PRL 98, 092001 (2007)

hep-ex/0708.0082

to appear in PRD(RC)

σσ(n

b)

(nb)

D*D*DD**

D*D*DD

DDDD Y(4260)Y(4260) Y(4360)Y(4360) Y(4660)Y(4660)

ψψ(4040) (4040) ψψ(4160) (4160) ψψ(4415)(4415)

Look for YLook for Ybb : b : bbb counterpart of counterpart of Y(4260)Y(4260)

• If bIf bbb follows the pattern in c follows the pattern in ccc , , YYbb should exist: should exist: YYbb→Y(nS)→Y(nS)ππππ

• Proposal: study of Proposal: study of YY(5S) data (5S) data • Belle collected 21.7 fbBelle collected 21.7 fb-1-1 at √s~10.87GeV at √s~10.87GeV• Only one energy point. At Y(5S) or nearby? Only one energy point. At Y(5S) or nearby? Let’s call it “Y(5S)” Let’s call it “Y(5S)” • ““Y(5S)”→YY(5S)”→Y(nS)(nS)ππ++ππ- - Y Y(nS)(nS)→→μμ++μμ--

• ΔΔM= M(M= M(YY(mS)(mS)))-M(-M(YY(nS)(nS))=)=M(M(μμππμμππ)-M()-M(μμμμ) m>n) m>n

J. Brodzicka for Belle @ KEKTH’07J. Brodzicka for Belle @ KEKTH’07

hep-ex/0710.2577

Hou, PRD74, 017504 (2006) Hou, PRD74, 017504 (2006)

“Y(5S)”→Y(2S)ππ

“Y(5S)”→Y(1S)ππ

Y(1S)

Y(2S)

Y(3S)“Y(5S)”→Y(3S)ππ

“Y(5S)”→Y(2S)ππ

“Y(5S)”→Y(1S)ππ

Huge Huge Y(5S)→Y(nS)Y(5S)→Y(nS)ππππ Do we see Do we see YYbb??

assuming Y(5S)@10.87GeVassuming Y(5S)@10.87GeV σ σ=0.302±0.015nb =0.302±0.015nb Large!Large!

• Large Y(5S)Large Y(5S)→Y(nS)→Y(nS)ππππ partial widths! partial widths! For other b For other bbb: : O(keV) O(keV)

• Do not agree with hypothesis for pure bDo not agree with hypothesis for pure bbb state state• Is it YIs it Ybb? Mixture of Y(5S) and Y? Mixture of Y(5S) and Ybb??• Energy scan around Y(5S) needed Energy scan around Y(5S) needed

J. Brodzicka for Belle @ KEKTH’07J. Brodzicka for Belle @ KEKTH’07

Process Yield Process Yield σσ(pb) (pb) BF(%) BF(%) ГГ(MeV) (MeV)

““Y(5S)”→Y(1S)Y(5S)”→Y(1S)ππππ 325 325±20 1.6±20 1.6±0.1±0.1 0.53±0.03±0.05 ±0.1±0.1 0.53±0.03±0.05 0.590.59±0.04±0.09±0.04±0.09““Y(5S)”→Y(2S)Y(5S)”→Y(2S)ππππ 186±15 2.3±0.2±0.3 0.78±0.06±0.11 186±15 2.3±0.2±0.3 0.78±0.06±0.11 0.850.85±0.07±0.16 ±0.07±0.16 ““Y(5S)”→Y(3S)Y(5S)”→Y(3S)ππππ 10±4 1.4±0.5±0.2 0.48±0.18±0.07 10±4 1.4±0.5±0.2 0.48±0.18±0.07 0.520.52±0.20±0.10 ±0.20±0.10

YYss: strange version of Y(4260)?: strange version of Y(4260)?

• Y(2175)→ f0(980) φ from BaBar

(confirmed by BESII)

J. Brodzicka for Belle @ KEKTH’07J. Brodzicka for Belle @ KEKTH’07

confirmed by BESII

PRD74, 091103 (R) (2006) PRD74, 091103 (R) (2006)

• Only C=+1 states produced Only C=+1 states produced • ee→ee→γγ→γγ→DDDD studied studied (395fb(395fb-1-1))

• Peak Peak observed M(DD)~3.93GeV observed M(DD)~3.93GeV • N=64N=64±±18 M=392918 M=3929±5±2MeV ±5±2MeV ГГ=29±10±2MeV=29±10±2MeV• ГГγγγγ*BF(Z*BF(Z→→DDDD)=)=0.180.18± 0.05±0.03 keV (for J=2)± 0.05±0.03 keV (for J=2)• Spin-2 favored over spin-0 by helicity distribution Spin-2 favored over spin-0 by helicity distribution • Z(3930) isZ(3930) is χχ’’c2 c2 candidiate candidiate

Z(3930) from Z(3930) from γγγγ J. Brodzicka for Belle @ KEKTH’07J. Brodzicka for Belle @ KEKTH’07

PRL 96, 082003 (2006)

J=2J=2

J=0J=0

Z(3930Z(3930))

e+ e+

e- e-

X D D

γ

γ

A lot of XYZ states…A lot of XYZ states…

• llll

J. Brodzicka for Belle @ KEKTH’07J. Brodzicka for Belle @ KEKTH’07

cccc (-like) state of art (-like) state of art • We added a few new states…We added a few new states…• Are they cAre they ccc? Do we understand them? ? Do we understand them?

J. Brodzicka for Belle @ KEKTH’07J. Brodzicka for Belle @ KEKTH’07

ηc(4S)

Y(3360), Y(3660)

SummarySummary

• Do we see new charmonium spectroscopy Do we see new charmonium spectroscopy @4GeV?@4GeV?

• There are good candidates for hybrids, There are good candidates for hybrids, multiquarks multiquarks

Y(3940) X(3872) Z(4430) Y-family…Y(3940) X(3872) Z(4430) Y-family…• XYZ spectroscopy in s and b quark sectors? Yb, XYZ spectroscopy in s and b quark sectors? Yb,

Ys?Ys?

J. Brodzicka for Belle @ KEKTH’07J. Brodzicka for Belle @ KEKTH’07

Lots of pieces…Lots of pieces…J. Brodzicka for Belle @ KEKTH’07J. Brodzicka for Belle @ KEKTH’07

Y(4360)

Y(4

660)

Y(4260)

Y(4

008)

X(3872)

X(416

0

)

Z(4430) Y(3940)

Are the

y al

l fro

m the

sam

e pu

zzle

?

BackupBackup

J. Brodzicka for Belle @ KEKTH’07J. Brodzicka for Belle @ KEKTH’07

Yb counterpart ?Yb counterpart ? J. Brodzicka for Belle @ KEKTH’07J. Brodzicka for Belle @ KEKTH’07

• M(M(ππππ) and cos) and cosθθhel hel studiedstudied

Brown-Cahn (CLEO) model Brown-Cahn (CLEO) model (grey) (grey)

generic phase space (open)generic phase space (open)

Double cDouble ccc production: production: e+e-e+e-→→J/J/ψψ(c(ccc))resres

• ..

J. Brodzicka for Belle @ KEKTH’07J. Brodzicka for Belle @ KEKTH’07

D D*

D

J/ψ

e+

e-

Y(3940) hybrid?Y(3940) hybrid?

• B B

J. Brodzicka for Belle @ KEKTH’07J. Brodzicka for Belle @ KEKTH’07