molecular charmonium . a new spectroscopy ?
DESCRIPTION
II Russian-Spanish Congress Particle and Nuclear Physics at all Scales and Cosmology. Molecular Charmonium . A new Spectroscopy ?. F. Fernandez D.R. Entem , P.G. Ortega Nuclear Physics Group and IUFFyM University of Salamanca. - PowerPoint PPT PresentationTRANSCRIPT
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Molecular Charmonium. A new Spectroscopy?
II Russian-Spanish Congress Particle and Nuclear Physics at all Scales and
Cosmology
F. Fernandez D.R. Entem, P.G. OrtegaNuclear Physics Group and IUFFyM
University of Salamanca
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The group of the Universtity of Salamanca
Heavy hadron spectroscopy Fernandez, Entem, Segovia, Ortega
B Weak DecaysFeanandez, Entem, Hernandez, Segovia
Effective-field theoriesEntem, Fernandez
Neutrino nucleus scattering (Hernandez)
Tetraquarks, hypernuclei Valcarce, Fernandez- Carames
II Russian-Spanish Congress Particle and Nuclear Physics at all Scales and
Cosmology
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Outline
Motivation Experimental scenarioThe constituent quark modelThe coupled channels formalismThe meson-meson sectorThe baryon meson sectorSummary
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Charmonium before B-factories
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Charmonium before B-factories
1980 – 2002 : no new charmonium states 5
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B-factories
@ KEK @ SLAC
Data taking : 2000 – 2010
e+e– → (4S)Ecms ~ 10.6 GeV
6
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Charmonium after B-factories
7
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N.Brambilla et al. Eur. Phys.J. C71, 1534(2011)
X(3872)
Z(4430)
Y(4260)
G(3900)
Zb(10610), Zb(10650)Zc(3900), Zc(4025)
8
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Some examples
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Quantum numbers compatibles with JPC=1++ and JPC=2-+ (ruled out by the recent LHCb data )
Width: Γ< 2,3 MeV
Mass: → below D0D*0 mass threshold
23871 61 0 16 0 19M , , , MeV / c
0
1
2
3872 1 0 0 4 0 33872
3872 2 2 13872
( X ( ) J / )R , , ,( X ( ) J / )
( X ( ) ( S ))R .( X ( ) J / )
X(3872)
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X(3872) gamma decay
3872X( ) J / J /
3872X( ) DD* J /
3872 2X( ) DD* ( S )
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The XYZ near 3940 MeV
Babar M=3914±4.1
JPC=?JPC=1++ JPC=2++
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7.7 σ
M(ωJ/ψ)
fit with no BW term
BW + background
N = 55 ±14+2–14 events
γγ X(3915) ωJ/ψ
M = 3914 ±3± 2 MeV/c2 Γ = 23 ± 10+2
–8 MeV
γe–
e+
J/e+
e–
γω
X
J = 0, 2 only
• 2σ difference with Z(3930) mass• good agreement with BaBar’s Y(3940) mass seen in ωJ/ψ
for JP = 0+ × B(X(3915)ωJ/ψ) = (69 ± 16+7–18) eV
ωJ/ψ partial width ~ 1 MeV Quite large for conventional charmonium
X(3915)
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Γ
cc
e+
e–e+
1– –s=E2
cm-2EEcm
DD-
G(3900) JPC=1- -
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_
(5S) (1S)+- (5S) (2S)+- (5S) (3S)+-
(5S) hb(1P)+- (5S) hb(2P)+-
phsp
note different scales
phspno non-res.contribution
M[ hb(1P) π ] M[ hb(2P) π ]
Two peaks are observedin all modes!
Belle: PRL108, 232001 (2012)
Zb(10610) and Zb(10650)
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(3S)hb(2P)
hb(1P)(2S)
(1S)
b(2S)
b(1S)
(4S)
(10860)
(11020)
9.50
9.75
10.00
10.25
10.50
10.75
11.00
Mas
s, G
eV/c
2 2M(B)
260
430
290 6
1
2
partial (keV)
–
+
Zb+
JPC = 0-+ 1-- 1-+
Z b(10610) and Z b
(10650)
should be multiquark states
Zb(10610) and Zb(10650)
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Zb(10610) and Zb(10650)
B*B*πBB*π
PhSp
PhSp
Zb(10650)alone
Zb(10650)+PhSp
Zb(10610) +Zb(10650)
Zb(10610)+PhSp
Zb(10610) +Zb(10650) +PhSp
8Zb(10610) Zb(10650)
6.8
BB*π data fits (almost) equally well to a sum of Zb(10610) and Zb(10650) or to a sum of Zb(10610) and non-resonant.
B*B*π signal is well fit to just Zb(10650) signal alone
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B(*)B* channels dominate Zb decays !
with Zb0 w/o Zb
0
with Zb0 w/o Zb
0
arXiv:1308.2646
Zb(10610) and Zb(10650)
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Zc(3900)
BESIII, PRL110,252001(2013)
Belle, PRL110,252002(2013)
hep-ex/1304.3036 CLEO-c
Charged object. Cannot be conventional c
harmonium
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ΛC(2940)+
20
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X(3250)
PRD 86 091102 (2012)
Taken from Gruenberger Proc Rencontres de Moriond QCD 2012)21
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Non conventional charmonium
Picture from Piilone Charm 2012
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Molecular hypothesis
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The Constituent Quark Model
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The constituent quark model
02 2
0ln20
s
qq reduced mass
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• N-N interaction– F. Fernández, A. Valcarce, U. Straub, A. Faessler. J. Phys. G19, 2013 (1993)– A. Valcarce, A. Faessler, F. Fernández. Physics Letters B345, 367 (1995)– D.R. Entem, F. Fernández, A. Valcarce. Phys. Rev. C62 034002 (2000)– B. Juliá-Diaz, J. Haidenbauer, A. Valcarce, and F. Fernández. Physical Review C 65,
034001, (2002)
• Baryon spectrum– H. Garcilazo, A. Valcarce, F. Fernández. Phys. Rev. C 64, 058201, (2001)– H. Garcilazo, A. Valcarce, F. Fernández. Phys. Rev. C 63, 035207 (2001)
• Meson spectrum.– J. Vijande, F. Fernández, A. Valcarce. J. Phys. G31, (2005)– J. Segovia, A. M. Yasser, D. R. Entem, F. Fernandez Phys. Rev D. 78 114033 (2008)
• .Reports– A. Valcarce, H. Garcilazo, F. Fernandez, P.Gonzalez Rep. Prog. Phys. 68 965 (2005)– J. Segovia, D. R. Entem, F. Fernandez, Int. Jour. Mod. Phys. E (to be published)
The constituent quark model
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Results for the 1- - sector
PRD 78 114033 (2008)
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Other XYZ states
No candidates for :
X(3872), X(3915) G(3900) Y(3940) Y(4260)
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Beyond the constituent quark model
Do we need to go beyond the naive constituent quark model to describe charmonium spectroscopy?
One possibility: Molecular state:loosely bound state of a pair of mesons.The dominant binding mechanismshould be pion exchange
Two quark states can mix with two meson with the same quantum numbers
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Coupling: Pair Creation Model
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Coupled channels:
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Coupled channels:
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Coupled channels:
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Hidden Charm Meson Sector
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Results: JPC=1++ sector
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Results: JPC=1++ sector
J. Phys. G 40 085107 (2013)
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0
1
2
3872 1 0 0 4 0 0 5233872
3872 2 2 113872
13
( X ( ) J / )R , , ,( X ( ) J / )
( X ( ) ( S ))R .( X (
,
,) J / )
Theory
Results: JPC=1++ sector
J. Phys. G 40 085107 (2013)
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Results: JPC=0++ sector
J. Phys. G 40 085107 (2013)
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Results: JPC=1-- sector
23900 3943 17 12M(G( )) Mev / c
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Results
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B(*) B(*) Molecules
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Charmed Baryon Sector
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The Baryon Meson system
43
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The Baryon Meson system
44
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D(*) N and D(*) Δ States
45
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D(*)N and D(*)Δ Decays Widths
46
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JP isospin state M (MeV)/c2 Eb (MeV) (MeV)
3/2- 0 D*N 2940,06 -8.02 20.761/2- 2 D*Δ 3232,70 -6.47 110.895/2- 1 D*Δ 3226,05 -13.12 107.5
Some selected states
47
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JP Isospin state M (MeV)/c2 Eb (MeV) (MeV)
3/2- 0 D*N 2940,06 -8.02 20.761/2- 2 D*Δ 3232,70 -6.47 110.895/2- 1 D*Δ 3226,05 -13.12 107.5
2939 8 1 3 1 0, , ( stat ) , ( sys ) 17 5 5 2 5 9. . ( stat ) . ( sys )
State M (MeV)/c2 (MeV)
Λc (2940)+
X(3250)
3245 20 108 6
Λc (2940)+ → D*N (I) JP = (0) 3/2-
X(3250) → D*Δ (I) JP = (1) 5/2- or (I) JP = (2) 3/2-48
Some selected states
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Λb partner of Λc (2940)+
Λb(2940)+
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Summary
We have study the influence of molecular structures in heavy meson and baryon phenomenology
We have used a constituent quark model to study both the meson and the molecular sectors
The model describe the X(3872) and other XYZ states as D D* resonances coupled to two quark states
We have extended our calculation to the baryon- meson sector
Without change the parameters we found a ND* bound states with JP=3/2- which can be identify with the Λc(2940)+ state
The recently reported Xc(3250) can also be explained as a D*Δ molecule
As final conclusion molecular structures may play an important role in the description of the meson and baryon espectra
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End
Thanks for your attention
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Back slides
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Results for XYZ states: Z(3930)
PRL 96 (06) 082003
• Observed by Belle Collab.• produced in
Helicity angle distribution favours J=2
( (3930)) .18 0.05 0 ..03B Z DD keV
3929 5 2 .29.9 10 2 .
M MeVMeV
DD
Our results 2 (2 )c
M=3968 MeV. =49.1 MeV.
( (3930)) 0.15 .B Z DD keV
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M=(4156 15)MeV/c2
=(139 21)MeV
+25−20
+111 −61
5.5 X(4160)
D*reconstructed D*tag
Results for XYZ states: X(4160)
M=4166 MeV/c2
=122.9 MeV
Our results
((D*D*) =52.3 MeV)
2 (2 )c
e+e− J/ D*D*observed by Belle in
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Coupling formalism with T matrix
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Coupling elements
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Results for XYZ states