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Wasa- at - COSY. New Results on the ABC-Resonance Structure. Mikhail Bashkanov. Content. Resonance in Isospin decomposition , Open channels Resonance in elastic scattering . Two-pion production. “ s ”. N*. D(1600). N*. D. D. D. D. T p < 1.5 GeV.

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Presentation Transcript
slide1

Wasa-at-COSY

New Results on the ABC-Resonance Structure

Mikhail Bashkanov

content
Content
  • Resonance in
  • Isospin decomposition
    • ,
  • Open channels
  • Resonance in elastic scattering
two pion production
Two-pion production

“s”

N*

D(1600)

N*

D

D

D

D

Tp< 1.5 GeV

slide5

Total cross section pn d00

“ABC resonance”

70 MeV



NN*(1440)

P. Adlarson et. al Phys. Rev. Lett. 106:242302, 2011

quantum numbers of the structure

1+

3+

Quantum numbers of the structure

pn d*  ∆∆d 00

Antisymmetrization: Jp=1+or 3+ : if LΔΔ=0

1+ excluded by ().3+ assigned

pn  d 00

I=0

I=0,1

I=0

I=0,2

m for different energies
M for different energies

t-channel 

“ABC effect”

status of theoretical description

Δ

π

p

d

π

n

Δ

Status ofTheoretical Description
  • pn  R DD  dp0p0

I(Jp) = 0(3+)

slide11

Total cross section pN d

P. Adlarson et. al Phys. Lett. B721 (2013) 229

isospin violation
Isospin violation

00

+-

pn pp 0
pn  pp-0

Conventional process +ABC



Conventional process

Preliminary

ABC “expected”

prediction for the open channels
Prediction for the open channels

M. Albaladejo, E. Oset nucl-th:1304.7698

kinematics

dpnp + psp

Kinematics

neutron

Proton spectator

proton

3 resonance in np

p

p

n

n

3+Resonance in np

p

n

L=2

p

n

L=4

total pn cross section
Total pncross-section

Devlin et al, PRD8, 136 (73)

LisowskI et al, PRL49, 255(82)

SAID

SAID + resonance

expectations

p

p

n

n

Expectations

SAID with resonance

SAID

expectation

p

p

n

n

Expectation

SAID with resonance

SAID

SAID with resonance

reality

p

p

n

n

Reality

SAID with resonance

SAID

SAID with resonance

pn vector analysing power
pn Vector AnalysingPower

Very Preliminary

SAID with resonance

SAID

SAID with resonance

conclusion
Conclusion
  • d*-resonance is seen in
  • Other open channels need to be analyzed (, )
  • pn-elastic scattering exhibits fast phase motion
    • Good hints for a resonance in elastic channel
  • A discovery of a new resonance?
    • Dibaryon: , ,
beam polarization
Beam polarization

Polarization 2

0

Polarization 1

2

pn vector analysing power1
pn Vector AnalysingPower

Very Preliminary

SAID

SAID with resonance

SAID with resonance

isospin decomposition
Isospin Decomposition

N*(1440)



[(1600)]

Skorodko at al., Phys. Lett. B679 (2009) 30

beam polarization1
Beam polarization

Polarization 2

0

Polarization 1

2

slide38

Total cross section pp d+0

Shimizu et al.

F. Kren et al.

isospin violation1
Isospin violation

00

+-