BLINDBILD

Resonance Multiplets in the Two-Baryon System --- Dibaryons Revisited

MesonNet Meeting Prague, June 17 - 19, 2013

Heinz Clement

Fachbereich Physik

CERN Courier September 2011

H. Clement 2Resonances in the Two-Baryon System

Two-Baryon ScenarioTwo-Baryon Scenario Known knowns:Known knowns:

33SS11 deuteron groundstate: deuteron groundstate: I (JI (JPP) = 0 (1) = 0 (1++)) 11SS00 virtual state (NN FSI): virtual state (NN FSI): I (JI (JPP) = 1 (0) = 1 (0++))

Known unknowns:Known unknowns: Are there six-quark bags (genuine dibaryons)?Are there six-quark bags (genuine dibaryons)? Are there in general resonant states (molecular, dynamic) at all?Are there in general resonant states (molecular, dynamic) at all?

Recent experimental findings:Recent experimental findings: 11DD2 2 resonance near the resonance near the N threshold: N threshold: I (JI (JPP) = 1 (2) = 1 (2++)) ABC resonance structure much below the ABC resonance structure much below the threshold: threshold: I (JI (JPP) = 0 (3) = 0 (3++))

Are there more states?Are there more states? Model predictionsModel predictions Dyson‘s multipletDyson‘s multiplet

H. Clement 3Resonances in the Two-Baryon System

The The 11DD22 Resonance Resonance Best seen in pp Best seen in pp d d,,

but also in pp but also in pp pn pn as well as pp and as well as pp and d scattering d scattering (phaseshift analyses)(phaseshift analyses)tot(d pp) Argand plot

I (JP) = 1 (2+)M = 2144 MeV = m + mN – 26 MeV = 110 MeV

R.A. Arndt et al., PRC 48 (1993) 1926 50 (1994) 1796 56 (1997) 635N. Hoshizaki, PRC 45 (1992) R1424 Prog. Theor. Phys. 89 (1993) 245 251 563 569

Alternative dynamic description: Diss. C.A. Mosbacher, Bonn 1998

H. Clement 4Resonances in the Two-Baryon System

The ABC Resonance I (JThe ABC Resonance I (JPP) ) = 0 (3= 0 (3++))

“ABC resonance”

intr50 MeV

70 MeV≤1/3

Phys.Rev.Lett.106, 242302 (2011)

M 2370 MeV 2m – 90 MeV

See talkM.

Bashkanov

H. Clement 5Resonances in the Two-Baryon System

pn pn R R d d

Δ

Δd

π

πp

n

I (JP) = 0 (3+)

M, i f , F(q)

M

Md

d*

model

Phys.Rev.Lett.106, 242302 (2011)

ABC effect

H. Clement 6Resonances in the Two-Baryon System

(pN (pN d d ))

I = 0 + 1

I = 0

I = 1(pn (pn d d ))

½ ½ (pp (pp d d ))

(pn (pn d d ))

COSY Annual Report 2012Phys. Lett. B721 (2013) 229

H. Clement 8Resonances in the Two-Baryon System

Status of the ABC Status of the ABC ResonanceResonance

decay channel branching statusdecay channel branching status------------------------------------------------------------------------------------------------------------------------------------------------d d 15 % 15 % observedobservedd d 25 % observed 25 % observedpppp 7 % observed 7 % observednpnp (12 %, predicted (12 %, predicted**) data ) data analysis WASAanalysis WASAnpnp (31 %, predicted (31 %, predicted**) data ) data analysis HADESanalysis HADESnp (10 %, predicted) data np (10 %, predicted) data analysis WASAanalysis WASA

* Fäldt & Wilkin, PLB 701 (2011) 619* Fäldt & Wilkin, PLB 701 (2011) 619 Albaladejo & Oset, arXiv:1304.7698 Albaladejo & Oset, arXiv:1304.7698 [nucl-theor][nucl-theor]

See talkM.

Bashkanov

first results very encouraging!

H. Clement 9Resonances in the Two-Baryon System

Experiment Bag Model QDCSM ChQM Experiment Bag Model QDCSM ChQM

SU(6) SU(6) Mulders et al. Goldman, Ping et al. Huang, Shen Mulders et al. Goldman, Ping et al. Huang, Shen et al. Dysonet al. Dyson PRD 21 (1980) 2653 PRC 79 (2009) 024001 PRD 21 (1980) 2653 PRC 79 (2009) 024001 Mod.Phys.Lett.A25(2010)2155 PRL 13 (1964) 815Mod.Phys.Lett.A25(2010)2155 PRL 13 (1964) 815

Comparison to predictions Comparison to predictions from Quark Modelsfrom Quark Models

1+ 0+

2+

3+

I = 0 1 0 1 0 1 0 1I = 0 1 0 1 0 1 0 1 0 1 0 1

E

……

……

H. Clement 10Resonances in the Two-Baryon System

… … inevitable dibaryon: unique inevitable dibaryon: unique symmetry!symmetry!

H. Clement 11Resonances in the Two-Baryon System

I(JI(JPP) = 0(3) = 0(3++) state: ) state: totally symmetric in space, spin & colortotally symmetric in space, spin & color antisymmetric in isospinantisymmetric in isospin accessed via accessed via as as doorwaydoorway ? ?

… … inevitable dibaryoninevitable dibaryon

N N d*

N N

H. Clement 12Resonances in the Two-Baryon System

Dyson‘s Multiplet Dyson‘s Multiplet PredictionPrediction

H. Clement 13Resonances in the Two-Baryon System

State I J Asymptotic Configuration mState I J Asymptotic Configuration mtheortheor [MeV] m [MeV] mexpexp [MeV] [MeV] expexp [MeV] [MeV] ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------

DD0101 0 1 Deuteron 1876 0 1 Deuteron 1876 1876 1876 DD1010 1 0 virtual 1 0 virtual 11SS00 1876 1876 1878 1878

DD1212 1 2 NN( 1 2 NN(11DD22) ) N N NN NN 2160 2144 2160 2144 110 110

DD2121 2 1 2 1 N N NN NN 2160 ? 2160 ? ? ?

DD0303 0 3 NN( 0 3 NN(33DD33) ) NN NN 2350 2370 2350 2370 70 70

DD3030 3 0 3 0 NN NN 2350 ? 2350 ? ? ?

------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------

Dyson‘s PredictionDyson‘s Prediction

H. Clement 14Resonances in the Two-Baryon System

State I J Asymptotic Configuration mState I J Asymptotic Configuration mtheortheor [MeV] m [MeV] mexpexp [MeV] [MeV] expexp [MeV] [MeV] ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------

DD0101 0 1 Deuteron 1876 0 1 Deuteron 1876 1876 1876 DD1010 1 0 virtual 1 0 virtual 11SS00 1876 1876 1878 1878

DD1212 1 2 NN( 1 2 NN(11DD22) ) N N NN NN 2160 2144 2160 2144 110 110

DD2121 2 1 2 1 N N NN NN 2160 ? 2160 ? ? ?

DD0303 0 3 NN( 0 3 NN(33DD33) ) NN NN 2350 2370 2350 2370 70 70

DD3030 3 0 3 0 NN NN 2350 ? 2350 ? ? ?

------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------

Dyson‘s PredictionDyson‘s Prediction

H. Clement 15Resonances in the Two-Baryon System

A hint for DA hint for D2121 I(J I(JPP) = ) = 2(12(1++) ?) ?

Pionic Double Charge Exchange in Nuclei:Pionic Double Charge Exchange in Nuclei: non-analog transitions:non-analog transitions:

A. Wirzba et al., PRC 40 (1989) 2745M.B. Johnson, L.S. Kisslinger, PLB 168 (1986) 26

intermediate system:

(N)I=2, JP=1+

M 2150 MeV

90 MeV

J. Draeger et al., PRC 62 (2000) 064615

H. Clement 16Resonances in the Two-Baryon System

ConclusionsConclusions

1+ 0+

2+

3+

I =I = 0 1 2 3 0 1 2 3

E

0+

1+

Non-Strange Two-Baryon Non-Strange Two-Baryon SpectrumSpectrum

3 established states: 3 established states: 33SS11 deuteron deuteron groundstategroundstate 11SS00 virtual state virtual state 11DD22 resonance resonance ((N)N) 1 new - 1 new - possibly exoticpossibly exotic - candidate: - candidate: ABC resonance ABC resonance Are there more states?Are there more states?

NN-decoupled states with I = 2, 3?NN-decoupled states with I = 2, 3? Search in pp Search in pp pppp

and in pp and in pp pppp

Dyson‘s prediction

H. Clement 17Resonances in the Two-Baryon System

ExperimentExperiment Bag Model QDCSM ChQM Bag Model QDCSM ChQM

SU(6) SU(6) Mulders et al. Goldman, Ping et al. Huang, Shen Mulders et al. Goldman, Ping et al. Huang, Shen et al. Dysonet al. Dyson PRD 21 (1980) 2653 PRC 79 (2009) 024001 PRD 21 (1980) 2653 PRC 79 (2009) 024001 Mod.Phys.Lett.A25(2010)2155 PRL 13 (1964) 815Mod.Phys.Lett.A25(2010)2155 PRL 13 (1964) 815

Comparison to predictions Comparison to predictions from Quark Modelsfrom Quark Models

1+ 0+

2+

3+

I = 0 1 0 1 0 1 0 1I = 0 1 0 1 0 1 0 1 0 1 0 1

E

……