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Charmonium and Charm Spectroscopy at the e + e - B-Factories. FPCP 2006, Vancouver April 10, 2006 Helmut Marsiske , SLAC. Outline. Note Microsoft convention: underline  overbar. Charmonium-candidate States X(3872), X(3940), Y(3940) Y(4260), Z(3930)

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charmonium and charm spectroscopy at the e e b factories

Charmonium and Charm Spectroscopy at the e+e- B-Factories

FPCP 2006, Vancouver

April 10, 2006

Helmut Marsiske, SLAC

outline
Outline

Note Microsoft convention:

underline  overbar

  • Charmonium-candidate States
    • X(3872), X(3940), Y(3940)

Y(4260), Z(3930)

  • Charmed-strange Mesons
    • DsJ*(2317), DsJ(2460)
  • Charmed Baryons
    • Λc(2940), Ξcx(2980), Ξcx(3077)

Tetraquarks,

D*D molecules,

ccg hybrids, etc.

No (charmed)

Pentaquarks

@ B-factories

Helmut Marsiske, SLAC Charm/onium Spectroscopy

charm onium production at babar belle and cleo
Continuum production: √s ≤ 10.58 GeV

e+e-cc (ISR, double charmonium)

two-photon

Production in B decay: √s ≈ 5.28 GeV

bc transition

B(cc)K(*)

Charm/onium Productionat BABAR, Belle, and CLEO
  • Very large data samples
    • 450-700M cc events,
    • 380-590M BB events

Detectors with excellent tracking, vertexing, e.m. calorimetry, and particle ID

Helmut Marsiske, SLAC Charm/onium Spectroscopy

x 3872 j
X(3872)+-J/

Belle: 152M BB

PRL 91, 262001 (2003)

  • Observed in B-decay

Belle: 275M BB

hep-ex/0505038

BABAR: 232M BB

PRD 73, 011101 (2006)

N=61.2±15.3

(6.1 σ)

N=49.1±8.4

B± only

Solid hist.:

mES sidebands

B± and B0

Helmut Marsiske, SLAC Charm/onium Spectroscopy

inclusive search for b k x 3872
Inclusive Search for BK X(3872)

BABAR: 232M BB

PRL 96, 052002 (2006)

  • BB sample with one B fully reconstructed
  • Two-body decay of other B  monochromatic line in the kaon momentum spectrum in the B-meson center-of-mass (CM) frame

No charged X(3872) observed

Helmut Marsiske, SLAC Charm/onium Spectroscopy

x 3872 j c x 1
X(3872)J/  C(X)=+1

BABAR: 287M BB

Preliminary

N=19.4±5.7

(3.4 σ)

Belle: 275M BB

hep-ex/0505037

#B’s in 64MeV bins of M(J/)

N=13.6±4.4

(4.0 σ)

S=1.3

Helmut Marsiske, SLAC Charm/onium Spectroscopy

invariant mass spectrum in x 3872 j
+- Invariant Mass Spectrumin X(3872)+-J/

Belle: 275M BB

hep-ex/0505038

  • C(X)=+1  IG(JPC)[+-]= 1+(1--)  0
    • Expect +- invariant mass spectrum to peak near the upper kinematic boundary
  • [+-] - J/ in relative S-wave or P-wave
    • M(+-) centrifugal suppression
      • S-wave: JPC(X)= 0++, 1++, 2++
      • P-wave: JPC(X)= 0-+, 1-+, 2-+
  • P(X(3872))=+1 preferred

Shaded: X(3872) sidebands

S-wave

P-wave

2/d.o.f = 43.1/39

2/d.o.f = 71.0/39

Helmut Marsiske, SLAC Charm/onium Spectroscopy

x 3872 isospin
X(3872) Isospin

BABAR: 234M BB

PRD 71, 031501 (2005)

  • Isospin=1 for C=+1 +-J/ final state, but no charged partners X±(3872)

 Initial state X0(3872) isospin=0  X(3872)+-J/ isospin-violating decay

  • Isospin-allowed decay X(3872)+- 0 J/ suppressed by kinematics
    • C(X)=+1  IG(JPC)[+- 0]= 0-(1--)  

Belle: 275M BB

hep-ex/0505037

Helmut Marsiske, SLAC Charm/onium Spectroscopy

b k x 3872 x 3872 j decay angular distributions
BK X(3872), X(3872)+-J/ Decay Angular Distributions

c2/dof = 11/9

ql

|cosql|

K

c2/dof = 5/9

c

|cosc|

Belle: 275M BB

hep-ex/0505038

  • Exclude JPC = 0-+, 0++ with 2/d.o.f = 34.2/9, 31.0/9
  • Consistent with JPC = 1++
  • Inconclusive for JPC = 2++

Red: X(3872)sidebands

Angles in the

X(3872)rest frame

J.L. Rosner,

PRD 70, 094023 (2004)

Helmut Marsiske, SLAC Charm/onium Spectroscopy

x 3872 d 0 d 0 0 d 0 d 0
X(3872)D0D00 (D0D*0)

N=12.5±3.9

(>5)

Preliminary

Belle: ~270M BB

MoriondQCD06

M(D0D00) in B signal region:

|ΔE|<10 MeV;

shaded: |ΔE| sidebands

M(D0D0p0) ≈ M(X)

JPC=2++ D-wave required  very unlikely so close to threshold

No DD decay for JP=1+

Decay into 3 pseudoscalars excludes JP=0+

Everything consistent with I=0, JPC=1++ for X(3872)

Helmut Marsiske, SLAC Charm/onium Spectroscopy

x 0 3940
X0(3940)

Belle: 375 fb-1

hep-ex/0507019

  • Observed in the recoil against J/ in cc continuum events together with three known C=+1 cc states: c , c0 , c (2S)

N=266±63

(5.0 σ)

Possible interpretation:

X(3940) = c(3S)

DD

threshold

JPC=0-+ for c(3S)

Helmut Marsiske, SLAC Charm/onium Spectroscopy

Surprisingly large J/-(cc) cross section for NRQCD

x 0 3940 d d
X0(3940)D*D

Mrec(J/yD)=M(D)

Mrec(J/yD)=M(D*)

Belle: 375 fb-1

hep-ex/0507019

  • Above D(*)D threshold  search for DD and D*D decay [constrain recoil against (J/ D)]

Shaded: D sidebands

DD

No DD decay for JPC=0-+

D*- D P-wave for JPC=0-+

N=24.5±6.9

(5.0 σ)

D*D

No large decay into J/ :

Helmut Marsiske, SLAC Charm/onium Spectroscopy

y 3940 j c y 1
Y(3940)J/ C(Y)=+1

Belle: 275M BB

PRL 94, 182002 (2005)

  • Large threshold enhancement observed in B-decay
    • If interpreted as S-wave resonance
    • Unlikely decay mode for cc state above D(*)D threshold
  • Different from X(3940)?

#B’s in bins of M(J/)

N=58±11

(>8 σ)

Helmut Marsiske, SLAC Charm/onium Spectroscopy

z 3930 d 0 d 0 d d
Z(3930)D0D0, D+D-

Belle: 395 fb-1

PRL 96, 082003 (2006)

  • Observed in two-photon interactions  C=+1

N=64±18

(5.3 σ)

Solid line:

J = 2, =2

2/d.o.f= 1.9/9

Dashed line:

no signal

Dashed line:

J = 0

2/d.o.f= 23.4/9

Solid hists.: Dsidebands

|cos*|: D angle w.r.t. beam axis in  CM

Likely 23P2 cc state: c2(2P)

Helmut Marsiske, SLAC Charm/onium Spectroscopy

y 4260 j
Y(4260)+-J/

(2S)

BABAR: 233 fb-1

PRL 95, 142001 (2005)

  • Observed in ISR events  JPC = 1--
  • Indication in B-decay  needs confirmation

Assuming single resonance

N=123±23

(>8 σ)

BABAR: 232 fb-1

PRD 73, 012005 (2006)

Peak cross section:

σ(e+e-Y)=(51±12) pb

BABAR: 232M BB

PRD 73, 011101 (2006)

Helmut Marsiske, SLAC Charm/onium Spectroscopy

confirmation of y 4260 in cleo c scan s 3 77 4 26 gev
Confirmation of Y(4260) in CLEO-c Scan √s=3.77 - 4.26 GeV

CLEO-c: 13.2 pb-1

hep-ex/0602034

  • Enhanced cross section for e+e-J/ @ √s=4.26 GeV

NB: BABAR +-J/

peak cross section: (51±12) pb

N=37

(11 σ)

N=8

(5.1 σ)

No sign of (4040)=(3S) decay to+-J/

 Y(4260)= (4S) assignment less likely

Helmut Marsiske, SLAC Charm/onium Spectroscopy

more confirmation of y 4260 from cleo iii
More Confirmation of Y(4260)from CLEO-III

CLEO-III: 13.3 fb-1

Preliminary

  • ISR production of +-J/ events in CLEO-III data near √s=10.58 GeV

Note: CLEO-III

efficiency is ~1.7

times BABAR.

Boost? Detector??

N≈12

(4.9 σ)

Helmut Marsiske, SLAC Charm/onium Spectroscopy

no indication for y 4260 in other isr produced final states
No Indication for Y(4260) in Other ISR-produced Final States

(3770)

DD(3900)

(4040)

(4160)

Shaded: D

sidebands

M(K+K-)

(4415)

Y(4260)

Shaded:  sidebands

BABAR: 232 fb-1

To.b.subm.to PRD

BABAR: 289 fb-1

To.b.subm.to PRL

Preliminary

Preliminary

BABAR: 232 fb-1

PRD 73, 012005 (2006)

Helmut Marsiske, SLAC Charm/onium Spectroscopy

charmonium candidate states
Charmonium-candidate States

Tetraquarks, D*D molecules,

ccg hybrids, etc.

Helmut Marsiske, SLAC Charm/onium Spectroscopy

update on charmed strange mesons d sj 2317 and d sj 2460
Update on Charmed-strange MesonsDsJ*(2317)+ and DsJ(2460)+

BABAR: 232 fb-1

Submitted to PRD

  • Comprehensive study of decays to Ds+ plus one or two ±, 0, or ’s
    • Decay pattern if JP=0+ and JP=1+, respectively

Preliminary

Ds+0 only decay

mode observed

for DsJ*(2317)+

NB: all “Seen” modes are also “Allowed”

Helmut Marsiske, SLAC Charm/onium Spectroscopy

d sj 2317 d s 0
No indication of neutral or doubly-charged partner near 2317 MeV  I=0DsJ*(2317)+Ds+0

BABAR: 232 fb-1

Submitted to PRD

N=3180±80

Preliminary

Ds*(2112)

signal

Preliminary

Ds*(2112)

reflection

Dark shade:

DsJ(2460) reflection

Circles: Ds

sidebands

Helmut Marsiske, SLAC Charm/onium Spectroscopy

b d d sj 2317 d sj 2317 d s 0
BDDsJ*(2317)+,DsJ*(2317)+Ds+0

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

Helmut Marsiske, SLAC Charm/onium Spectroscopy

d sj 2460 d s d s 2112 0
DsJ(2460)+Ds+  / Ds*(2112)+0

Ds*+Ds+

DsJ(2460)+Ds+

Preliminary

Preliminary

N=560±40

Open points:

Ds sidebands

Light shade:

Ds*(2112)

reflection

Dark shade:

DsJ*(2317)

reflection

N=920±60

Open points:

Ds sidebands

BABAR: 232 fb-1

Submitted to PRD

Preliminary

Helmut Marsiske, SLAC Charm/onium Spectroscopy

b d d sj 2460
BDDsJ(2460)+

Belle: 274M BB

BELLE-CONF-0461 (2004)

(b): DsJ(2460)+Ds+

(c): DsJ(2460)+Ds *(2112) +0

Ds*+

Ds+

No Ds  decay for J=0

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)

Helmut Marsiske, SLAC Charm/onium Spectroscopy

d sj 2460 d s
No indication of DsJ*(2317)+

Also observe Ds1(2536)+

DsJ(2460)+Ds++-

BABAR: 232 fb-1

Submitted to PRD

N=6±3

Preliminary

DsJ*(2317)

N=193±22

N=123±15

Ds1(2536)

DsJ(2460)

Preliminary

Preliminary

Helmut Marsiske, SLAC Charm/onium Spectroscopy

d sj 2460 absolute branching fractions bfs
DsJ(2460)+ Absolute Branching Fractions (BFs)

p

e-

D*

Breco

e+

Bsignal

D*

X

BABAR: 230M BB

To.b.subm.to PRL

  • BB sample with one B fully reconstructed  study decays of other BD(*)+,0 X
    • Observe DsJ(2460) signals in the recoil mass, mX

Helmut Marsiske, SLAC Charm/onium Spectroscopy

d sj 2460 absolute bfs cont
DsJ(2460)+ Absolute BFs, cont.

BABAR: 122M BB

PRL 93, 181801 (2004)

  • Combine with previously measured, exclusive product BFs BD(*) DsJ(2460)+, DsJ(2460)+Ds+ / Ds*(2112)+0to obtain absolute BFs:
  • Sum of known BFs: 0.70±0.15

Preliminary

(Ds*+ Ds+)

Helmut Marsiske, SLAC Charm/onium Spectroscopy

charmed strange mesons
Charmed-strange Mesons

cs P-wave,

tetraquarks,

etc.

DsJ(2460) absolute

branching fractions (BFs)

BABAR: 232 fb-1

Preliminary

BABAR: 230M BB

Preliminary

Belle: 274M BB

BELLE-CONF-0461 (2004)

Helmut Marsiske, SLAC Charm/onium Spectroscopy

new charmed baryon c 2940
New Charmed Baryon: Λc(2940)+

Λc(2880)

Λc(2940)

Shaded: D0 sidebands

Blue: D0p

BABAR: 287 fb-1

Submitted to PRL

  • Observed in cc continuum events in the decay mode D0p (D0K-+, K-++-)
  • First observation of Λc(2880)+D0p
  • No structure in D+p
    • No doubly-charged partner for either state

Preliminary

N=2280±310

(>7 σ)

N=3020

±220

Helmut Marsiske, SLAC Charm/onium Spectroscopy

two new charmed strange baryons cx 2980 and cx 3077
Two New Charmed-Strange Baryons: Ξcx(2980)+ and Ξcx(3077)+

Belle: 462 fb-1

MoriondQCD06

  • Observed in cc continuum events in the decay mode Λc+K-+ (Λc+pK-+)

Preliminary

No structure in right-

sign Λc+ sidebands or

wrong-sign Λc+K+-,

Λc+K-- modes

No indication of

doubly-charmed

Ξcc(3520) (SELEX)

Helmut Marsiske, SLAC Charm/onium Spectroscopy

summary charmed baryons
Summary: Charmed Baryons

Belle: 462 fb-1

MoriondQCD06

BABAR: 287 fb-1

Preliminary

  • Three new states
  • New decay mode

Helmut Marsiske, SLAC Charm/onium Spectroscopy

summary charmed strange mesons
Summary: Charmed-strange Mesons
  • Consistent with cs P-wave states
    • Masses unexpectedly low

Belle: 274M BB

BELLE-CONF-0461 (2004)

BABAR: 232 fb-1

Preliminary

BABAR: 230M BB

Preliminary

DsJ(2460) absolute

branching fractions (BFs)

Helmut Marsiske, SLAC Charm/onium Spectroscopy

summary charmonium candidate states
Summary: Charmonium-candidate States

Helmut Marsiske, SLAC Charm/onium Spectroscopy

backup slides
Backup slides

Helmut Marsiske, SLAC Charm/onium Spectroscopy

charmonium candidate states1
Charmonium-candidate States

Tetraquarks, D*D molecules,

ccg hybrids, etc.

Helmut Marsiske, SLAC Charm/onium Spectroscopy

searches for x 3872 j in other processes
Searches for X(3872)+-J/ in other processes
  • No ISR production  JPC  1--
  • No quasi-real two-photon production  JPC 0-+, 0++, 2++

BABAR: 89 fb-1

PRD 71, 052001 (2005)

CLEO: 15.1 fb-1

PRL 94, 032004 (2005)

Helmut Marsiske, SLAC Charm/onium Spectroscopy

invariant mass spectrum in x 3872 j cont
+- Invariant Mass Spectrumin X(3872)+-J/ , cont.

CDF II: 360 pb-1

hep-ex/0512074

  • C(X)=+1  IG(JPC)[+-]= 1+(1--)  0
  • [+-] - J/ in relative S-wave or P-wave
      • S-wave: JPC(X)= 0++, 1++, 2++
      • P-wave: JPC(X)= 0-+, 1-+, 2-+, 3-+

1260±130 X(3872) candidates

Unable to distinguish

S-wave (P=+1) and

P-wave (P=-1)

Helmut Marsiske, SLAC Charm/onium Spectroscopy

x 0 3872 in b and b 0 decays
X0(3872) in B±and B0 Decays

BABAR: 232M BB

PRD 73, 011101 (2006)

  • Charge-specific branching fractions
  • Mass difference

N=8.3±4.5

(2.5 σ)

B0 only

Helmut Marsiske, SLAC Charm/onium Spectroscopy

x 3872 in b and b 0 decays
X±(3872) in B±and B0 Decays
  • Charge-specific branching fractions

BABAR: 232M BB

PRD 73, 011101 (2006)

Helmut Marsiske, SLAC Charm/onium Spectroscopy

x 3872 j1
X(3872)J/+-

JPC= 1 

y(2S),y(3770), …

  • Belle: discovery
    • Unexpected discovery mode for charmonium state above open-charm threshold
  • BABAR: search for X(3872)J/+- in Initial State Radiation (ISR) Events
  • ISR  e+e- collisions with a continuum of center-of-mass (CM) energies below the (4S)
    • Search final state

PRL 91, 262001 (2003)

Helmut Marsiske, SLAC Charm/onium Spectroscopy

no evidence for y 4260 in r scan
No evidence for Y(4260) in R-scan

Y(4260)

R

√s (GeV)

  • Dip in R at √s=4.26GeV

R≈3 and

σ=(14.2±0.6)nb

Y(4260) decay mode 

conventional charmonium

interpretation does not fit well

Factors >10 and >20 larger

than J/+- partial width

of (2S) and (3770), resp.

Helmut Marsiske, SLAC Charm/onium Spectroscopy

indication of y 4260 j in b decay
Indication of Y(4260) J/+-in B decay
  • Search for
    • 3.1σ significance, assuming mass and width from ISR analysis; needs confirmation

PRD 73, 011101 (2006)

232M BB

Helmut Marsiske, SLAC Charm/onium Spectroscopy

invariant mass spectrum in y 4260 j
+- Invariant Mass Spectrum in Y(4260)+-J/
  • C(Y)= -1 IG(JPC)[+-]= 0+(0++, 2++)

BABAR: 233 fb-1

PRL 95, 142001 (2005)

CLEO-c: 13.2 pb-1

hep-ex/0602034

Submitted to PRL

Solid hist: +- phase

spacefor (+-) - J/

S-wave

Solid hist: +- spectrum

likein (2S)+-J/

#Y’s in bins of M(+-)

+- invariant mass spectrum inconclusive

Helmut Marsiske, SLAC Charm/onium Spectroscopy

other y 4260 decay modes
Other Y(4260) Decay Modes?

BABAR: 232 fb-1

PRD 73, 012005 (2006)

Helmut Marsiske, SLAC Charm/onium Spectroscopy

discovery of x 3872 j
Discovery of X(3872)J/+-

157M BBbar

y(2S)

Events/10 MeV/c2

M(J/yp+p-) - M(J/y) (GeV/c2)

  • Belle:
    • Confirmed by CDF, D0, and BABAR
  • X(3872) properties
    • Mass at DD* threshold
    • Narrow width
    • JPC=1++ favored
    • m(+-) consistent with 
    • No evidence for charged partner X±(3872)

PRL 91, 262001 (2003)

157M BB

Helmut Marsiske, SLAC Charm/onium Spectroscopy

x 3872
X(3872)

Helmut Marsiske, SLAC Charm/onium Spectroscopy

x 38721
X(3872)
  • Some DD molecule predictions:

Helmut Marsiske, SLAC Charm/onium Spectroscopy

charmed strange mesons1
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 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-wavecs mesons with JP=0+ and JP=1+, respectively

Helmut Marsiske, SLAC Charm/onium Spectroscopy

charmed strange mesons2
Charmed-strange Mesons

Helmut Marsiske, SLAC Charm/onium Spectroscopy

summary of d sj 2317 and d sj 2460 branching ratio results
Summary of DsJ*(2317)+ and DsJ(2460)+ Branching Ratio Results

BABAR: 232 fb-1

Submitted to PRD

Helmut Marsiske, SLAC Charm/onium Spectroscopy

d sj 2460 absolute branching fractions bfs1
DsJ(2460)+ Absolute Branching Fractions (BFs)

BABAR: 230M BB

To.b.subm.to PRL

Helmut Marsiske, SLAC Charm/onium Spectroscopy

charmonium system
Below DD threshold

Large

PDG:

Above DD threshold

Small

CLEO:

Surprise

Mass, width, and decay mode  conventional charmonium interpretation does not fit well

Charmonium System

Helmut Marsiske, SLAC Charm/onium Spectroscopy

charmed baryons
Charmed Baryons
  • All nine JP=1/2+ ground states (L=0, Jqq=0,1) observed
  • All but one of six JP=3/2+ ground states (L=0, Jqq=1) observed
  • Growing number of excited states (L=1)
  • No confirmed doubly- charmed baryons yet

Helmut Marsiske, SLAC Charm/onium Spectroscopy

summary
Summary
  • Charmonium-candidate States
    • X(3872): I=0, JPC=1++
    • X(3940): c(3S), JPC=0-+ ?
    • Y(3940): I=0, C=+1
    • Z(3930): c2(2P), JPC=2++
    • Y(4260): I=0, JPC=1- -
  • Charmed-strange Mesons (cs P-wave states)
    • DsJ*(2317): I=0, JP=0+
    • DsJ(2460): JP=1+
  • Charmed Baryons
    • Λc(2940)+D0p
    • Ξcx(2980)+, Ξcx(3077)+ Λc+K-+

 New Charmed Baryon States

Helmut Marsiske, SLAC Charm/onium Spectroscopy

cleo c scan preliminary
CLEO-c scan (Preliminary)

Helmut Marsiske, SLAC Charm/onium Spectroscopy

workplace
Workplace

Helmut Marsiske, SLAC Charm/onium Spectroscopy