n*ews from cosy
DESCRIPTION
N*ews from COSY. May 2011 | Hans Ströher (Forschungszentrum Jülich, Germany). N*ews from COSY – Outline. COSY-facility Detection systems Selected recent results. N*ews from COSY – Storage Ring. Cooler and storage ring for (polarized) protons and deuterons p = 0.3 – 3.7 GeV/c - PowerPoint PPT PresentationTRANSCRIPT
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N*ews from COSY
May 2011 | Hans Ströher (Forschungszentrum Jülich, Germany)
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22. April 2023 Institut für Kernphysik (IKP) Folie 2
COSY-facility
Detection systems
Selected recent results
N*ews from COSY – Outline
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Cooler and storage ring for (polarized) protons and deuterons
p = 0.3 – 3.7 GeV/c
Phase space cooled internal & extracted beams
Injector cyclotron
N*ews from COSY – Storage Ring
e-CoolerCOSY
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Cooler and storage ring for (polarized) protons and deuterons
p = 0.3 – 3.7 GeV/c
Phase space cooled internal & extracted beams
Injector cyclotron
N*ews from COSY – Storage Ring
COSY
… the machine for spin physics with hadron beams
e-Cooler
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N*ews from COSY – Experiments
Hadron physics with hadronic probes
Experimental set-ups:
ANKE WASA EDM
TOF
NEW:
PAX
PAX
EDM
WASA
ANKE
TOF
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N*ews from COSY – Experiments
Hadron physics with hadronic probes
Experimental set-ups:
ANKE WASA EDM
TOF
NEW:
PAX
Future plan/project:srEDM
PAX
EDM
WASA
ANKE
TOF
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N*ews from COSY – Experiments
ANKE: forward magnetic spectrometer solid, gas-jet, polarized targets
double polarization experiments
TOF: large acceptance non-magnetic det. liquid hydrogen, deuterium targets
(non-)strange meson, hyperon prod.
WASA: ~4 electromagnetic calorimeter thin superconducting solenoid hydrogen, deuterium pellet target
symmetries and symmetry violation
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N*ews from COSY – Experiments
ANKE: forward magnetic spectrometer solid, gas-jet, polarized targets
double polarization experiments
TOF: large acceptance non-magnetic det. liquid hydrogen, deuterium targets
(non-)strange meson, hyperon prod.
WASA: ~4 electromagnetic calorimeter thin superconducting solenoid hydrogen, deuterium pellet target
symmetries and symmetry violation
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N*ews from COSY – Experiments
ANKE: forward magnetic spectrometer solid, gas-jet, polarized targets
double polarization experiments
TOF: large acceptance non-magnetic det. liquid hydrogen, deuterium targets
(non-)strange meson, hyperon prod.
WASA: ~4 electromagnetic calorimeter thin superconducting solenoid hydrogen, deuterium pellet target
symmetries and symmetry violation
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COSY
N N N N* [N N] X (= …)
NN fusion: p N(+) (N N*)+(+) d (+)
-resonance
Mostly: no resonance structure, since3(4)-body phase-space & strong FSI
invariant mass distributions
N*ews from COSY – General
HADES at GSI
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N N N N* [N N] X (= …)
Special cases, e.g. p p p p 00
WASA at CELSIUS
Roper
N*ews from COSY – General
COSY
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COSY
N N N N* N K Y (hyperons)
Isospin (-filter):
Konly N* resonances, e.g.N*(1650, 1675, 1680,1700,1710, 1720, 1840, 1875, 1900)
K both N* and * resonances, e.g.D*(1600, 1620, 1700, 1750, 1900)
Polarization (target, beam):
K+, p, asymmetries, polarization
N*ews from COSY – General
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p p p p p K p K++ Y Y00
(Y(Y00 = = 00))
TOFTOF
N*ews from COSY – Results (I)
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N*ews from COSY – pp pK+ (0)
Reaction: pp p K+ (p -)
3 beam energies: pp = 2.95 GeV/c (Q = 204, Q = 124 MeV); 3.06 GeV/c (239, 162 MeV); 3.20 GeV/c (284, 207 MeV)
Primary and secondary V-shape; charged multiplicity jump; ToF
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N*ews from COSY – pp pK+ (0)
Reaction: pp p K+ (p -)
3 beam energies: pp = 2.95 GeV/c (Q = 204, Q = 124 MeV); 3.06 GeV/c (239, 162 MeV); 3.20 GeV/c (284, 207 MeV)
Primary and secondary V-shape; charged multiplicity jump; ToF
Result: (1) COSY-TOF collaboration, EPJ A 46, 27 – 44 (2010)
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N*ews from COSY – pp pK+ (0)
Reaction: pp p K+ (p -)
3 beam energies: pp = 2.95 GeV/c (Q = 204, Q = 124 MeV); 3.06 GeV/c (239, 162 MeV); 3.20 GeV/c (284, 207 MeV)
Primary and secondary V-shape; charged multiplicity jump; ToF
Result: (2) case (239 MeV):
complete coverage
cms frame:cos(= 0 symmetric
Jackson-frames
helicity-frames
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N*ews from COSY – pp pK+ (0)
Reaction: pp p K+ (p -)
3 beam energies: pp = 2.95 GeV/c (Q = 204, Q = 124 MeV); 3.06 GeV/c (239, 162 MeV); 3.20 GeV/c (284, 207 MeV)
Primary and secondary V-shape; charged multiplicity jump; ToF
Result: (3) helicity-frames:
strong evidence for:
N*(1650)S11
N*(1710)P11 and/or N*(1720)P13
unlikely:
N*(1675)D15
N*(1680)F15
N*(1700)D13
p K+p
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N*ews from COSY – pp pK+ (0)
Reaction: pp p K+ (p -)
3 beam energies: pp = 2.95 GeV/c (Q = 204 MeV); 3.20 GeV/c (284 MeV) 3.30 GeV/c (316 MeV)
Primary and secondary V-shape; charged multiplicity jump; ToF
Result: (3) COSY-TOF collaboration, PL B 688, 142 (2010)
Dalitz-plot analysis
Importance of N*(1650)compared to N*(1710) N*(1720)
2.85 GeV/c … TOF (2006)
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N*ews from COSY – pp pK+ (0)
Reaction: pp p K+ (p -)
3 beam energies: pp = 2.95 GeV/c (Q = 204, Q = 124 MeV); 3.06 GeV/c (239, 162 MeV); 3.20 GeV/c (284, 207 MeV)
Primary and secondary V-shape; charged multiplicity jump; ToF
Result: (4) 0case (162 MeV):
complete coveragesmall statistics
cms frameJackson-frameshelicity-frames
differences to
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N*ews from COSY – pp pK+ (0)
Next: additional high-statistics data PWA
(i) upgraded detector (STT) (ii) polarized proton beam (2.95 GeV/c)
pb = 2.95 GeV/cP = (61 +- 2) %
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N*ews from COSY – pp pK+ (0)
Next: additional high-statistics data PWA
(i) upgraded detector (STT) (ii) polarized proton beam (2.95 GeV/c)
PAC39 (May 2011) allocated 9 weeks to finalize physics program;after that TOF will be decomissioned in 2012.
pb = 2.95 GeV/cP = (61 +- 2) %
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p p p p n K n K++ ++
ANKE, ANKE, COSY-11COSY-11
HIRESHIRES
N*ews from COSY – Results (II)
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N*ews from COSY – pp n K+ +
Reaction: pp K+ n X (COSY-11)pp K+ X ; (K+p) X ; (K++) X (ANKE)pp K+ X (HIRES)
Result: (1) COSY-11 collaboration, PL B 643, 251 (2006)ANKE collaboration, PR C81, 045208 (2010)HIRES collaboration, PL B 692, 10 (2011)
Disappointing expt´l situation, but:
very high X-sectionclearly excluded
no * ++ (1620) contribution needed
[µb]
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p p p p p p p p
(Resonances?)(Resonances?)
TOFTOF
N*ews from COSY – Results (III)
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N*ews from COSY – pp pp
Reaction: pp p p - X
3 beam energies: pp = 2.95 GeV/c (Q = 92 MeV); 3.06 GeV/c (128 MeV) 3.20 GeV/c (173 MeV)
4 charged particles; ToF; missing 0
Result: (1) COSY-TOF collaboration, EPJ A 44, 7 (2010)
via missing mass
„… no obvious indication of -production viaN* resonances found …“
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p p p p {pp} {pp}ss
(((1232))(1232))
ANKEANKE
N*ews from COSY – Results (IV)
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N*ews from COSY – pp {pp}s
Reaction: pp pp X (X = , 0)
6 beam energies: Tp = 353 … 800 MeV
2 protons, Epp < 3MeV 1S0 (Diproton); lab < 20°
Result: (1) ANKE collaboration, J.Phys. G 37, 105005 (2010)
missing mass analysis
0 dominating;clear -contribution
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N*ews from COSY – pp {pp}s
Reaction: pp pp X (X = , 0)
6 beam energies: Tp = 353 … 800 MeV
2 protons, Epp < 3MeV 1S0 (Diproton);lab < 20°
Result: (2) energy dependence shows resonantbehavior;
comparison withpn d
-resonanceshifted, smaller width
(note: no M1 possible)
WASA/Promise result (Uppsala) – covers much larger angular range
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p n p n d d 0000
(ABC-Effect)(ABC-Effect)
WASAWASA
N*ews from COSY – Results (V)
May 18,2011 - Session II-C (15:20)T. Tolba; „Double pion production in pp-interactions at Tp = 1.4 GeV“
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N*ews from COSY – pp pp 00
pp ppππ
high energiesnear threshold
pp→pN*(1440)
p π π ∆ (1232) π
p π
pp→∆ ∆(1232)
p π p π
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N*ews from COSY – pn d 00
Reaction: pd d 00 pspectator ; d and 00 detected
3 beam energies: Tp = 1.0, 1.2, 1.4 GeV; Fermi momentum
Effective energy ranges: 2.22 – 2.36; 2.33 – 2.44; 2.42 – 2.56 GeV
Result: (1) WASA-Collaboration, submitted PRL (2011)
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N*ews from COSY – pn d 00
Reaction: pd d 00 pspectator ; d and 00 detected
3 beam energies: Tp = 1.0, 1.2, 1.4 GeV; Fermi momentum
Effective energy ranges: 2.22 – 2.36; 2.33 – 2.44; 2.42 – 2.56 GeV
Result: (2)
Maximum (2.38 GeV) Off-peak (2.50 GeV)
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N*ews from COSY – pn d 00
Reaction: pd d 00 pspectator ; d and 00 detected
3 beam energies: Tp = 1.0, 1.2, 1.4 GeV; Fermi momentum
Effective energy ranges: 2.22 – 2.36; 2.33 – 2.44; 2.42 – 2.56 GeV
Result: (2)
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N*ews from COSY – pn d 00
Reaction: pd d 00 pspectator ; d and 00 detected
3 beam energies: Tp = 1.0, 1.2, 1.4 GeV; Fermi momentum
Effective energy ranges: 2.22 – 2.36; 2.33 – 2.44; 2.42 – 2.56 GeV
Result: (3)
What is this?
independently normalized
Mass ~ M() - 80 MeV
Width ~ ¼ of ()
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N*ews from COSY – pn d 00
Reaction: pd d 00 pspectator ; d and 00 detected
3 beam energies: Tp = 1.0, 1.2, 1.4 GeV; Fermi momentum
Effective energy ranges: 2.22 – 2.36; 2.33 – 2.44; 2.42 – 2.56 GeV
Result: (3)
Roper-contribution (R N)
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N*ews from COSY – pn d 00
Reaction: pd d 00 pspectator ; d and 00 detected
3 beam energies: Tp = 1.0, 1.2, 1.4 GeV; Fermi momentum
Effective energy ranges: 2.22 – 2.36; 2.33 – 2.44; 2.42 – 2.56 GeV
Result: (3)
t-channel -contribution (from pp d +0 via isospin)
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N*ews from COSY – pn d 00
Reaction: pd d 00 pspectator ; d and 00 detected
3 beam energies: Tp = 1.0, 1.2, 1.4 GeV; Fermi momentum
Effective energy ranges: 2.22 – 2.36; 2.33 – 2.44; 2.42 – 2.56 GeV
Result: (3)
s-channel resonance at M = 2.37 GeV and = 68 MeV
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N*ews from COSY – pn d 00
Reaction: pd d 00 pspectator ; d and 00 detected
3 beam energies: Tp = 1.0, 1.2, 1.4 GeV; Fermi momentum
Effective energy ranges: 2.22 – 2.36; 2.33 – 2.44; 2.42 – 2.56 GeV
Result: (4)
Next: (i) pn pn 00, (ii) pol. d-beam (i.e. np d00), (iii) pn elastic
J=1
J=3
pn R(3+) d00
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N*ews from COSY – Summary
Part of the ongoing COSY program devoted to N* physics(NN- and NY-interaction (ANKE, TOF), symmetries (WASA), …)
Hyperon production at TOF extension to pol. beams PWA
ABC-resonance at WASA nature (s-channel resonance?)
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N*ews from COSY – Summary
Part of the ongoing COSY program devoted to N* physics(NN- and NY-interaction (ANKE, TOF), symmetries (WASA), …)
Hyperon production at TOF extension to pol. beams PWA
ABC-resonance at WASA nature (s-channel resonance?)
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N*ews from COSY – Information
pp pp m