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Physics at COSY-Jülich
December 2010 | Hans Ströher (Forschungszentrum Jülich, Univ. Cologne)
Baryons´10, Osaka (Japan), December 7-11, 2010
21. April 2023 Institut für Kernphysik (IKP) Folie 2
Cooler and storage ring for (polarized) protons and deuterons
p = 0.3 – 3.7 GeV/c
Phase space cooled internal & extracted beams
Injector cyclotron
COSY
COSY – COoler SYnchrotron
… the machine forhadron spin physics
21. April 2023 Institut für Kernphysik (IKP) Folie 3
ANKE
TOF
WASA
COSY – Experimental Facilities
Hadron physics with hadronic probes
Experimental set-ups:
ANKE WASA EDM
TOF
NEW:
PAX
PAX
EDM
… the machine forhadron spin physics
21. April 2023 Institut für Kernphysik (IKP) Folie 4
Recent results:
Nucleon-nucleon programDi-proton final states S. Dymov (Friday, Dec. 10)
Strangeness program und (+,0,-) production
Symmetries program0, , ´ decays S. Schadmand (Friday, Dec. 10)ABC effect
Nuclear program production
Polarized (Anti-)protonsSpin transferSpin filtering (at COSY, AD/CERN)
Future Plans:
Electric Dipole Moment (EDM) search
Overview
21. April 2023 Institut für Kernphysik (IKP) Folie 5
Di-proton: {pp} in 1S0 state (Epp < 3 MeV)
(i)Inverse photodisintegration: pp {pp}s
(ii)Deuteron breakup: dp {pp}s n (polarized beam)
(iii)Deuteron breakup: dp {pp}s 0 (polarized beam)
(iv)Pion production: pN {pp}s (polarized beam and target)
(v)Deuteron breakup: dp {pp}s n (polarized beam and target)
Recent Results – Di-protons (ANKE)
New!
New!
LEC
21. April 2023 Institut für Kernphysik (IKP) Folie 6
Recent Results – Strangeness (ANKE)
Hyperon production in nucleon-nucleon collisions
(i) production: pp K+ p
(ii) 0 production: pp K+ p 0
(iii) Y production: pp K+ p (1405)/0(1385)
(iv) + production: pp K+ n +
(v) - production: pn K+ p -
Eur. Phys. J. A 46 (2010)
Phys. Rev. C 81 (2010)
(b)
New!
21. April 2023 Institut für Kernphysik (IKP) Folie 7
Recent Results – Nuclear (ANKE)
Nuclear -production: p A X (K+K-) X
Transparency ratio R mass dependence: A(0.58 +- 0.03)
Momentum dependence of R
Models indicate in-medium -width an order-of-magnitude larger than free
Phys. Lett. B(2010) in print
RNew!< p> =
1.1 GeV/c
Model-dependent analyses(Paryev; Oset et al.)
New!
21. April 2023 Institut für Kernphysik (IKP) Folie 8
Symmetry in 0, and ´decays:
(i)Isospin symmetry 3
(ii)Box anomaly +-
(iii)Transition form factor e+e- and e+e- e+e-
(iv)CPV e+e- +-
(v)Standard Model 0 e+e-
Recent Results – Symmetries (WASA)
Phys. Lett. B677 (2009)
New! New!
21. April 2023 Institut für Kernphysik (IKP) Folie 9
ABC-effect (-puzzle):
low 2-mass enhancement in isoscalar channel
connected with isoscalar NN-pair
correlated with excitation ?
pn d 00 ; dd 00 --- Resonant structure: What is it?
… also have data on pd, dd 3He n, pp {pp}s , pd pd
Recent Results – ABC (WASA)
New!New!
21. April 2023 Institut für Kernphysik (IKP) Folie 10
Recent Results – Polarization (PAX)
How to produce a beam of polarized anti-protons ?
Test of spin-flip (spin transfer lepton hadron)
COSY experiment: depolarization of a polarized proton beam by unpolarized electrons (of detuned e-cooler)
cross section much too small to provide a viable tool for polarizing anti-protons method of choice: spin-filtering
< 107 b !!
Phys. Lett. B674 (2009)99 (90)% CL
21. April 2023 Institut für Kernphysik (IKP) Folie 11
PAX
Plans – Polarized Antiprotons (PAX)
Spin-filtering: repeated interaction of the beam with a polarized target
„low-ß section“
Protons (FILTEX COSY), anti-protons (CERN/AD)
ANKEABS,BRP
21. April 2023 Institut für Kernphysik (IKP) Folie 12
Cooler and storage ring for (polarized) protons and deuterons
p = 0.3 – 3.7 GeV/c
Phase space cooled internal & extracted beams
Injector cyclotron
COSY
COSY – COoler SYnchrotron
… an ideal starting pointfor a srEDM search
21. April 2023 Institut für Kernphysik (IKP) Folie 13
Future plans – EDM
Upper limits for eEDM, µEDM, nEDM, …; new measurements …
NEW: Search for hadronic EDMs of charged particles (p, d,3He) with polarized beams in a storage ring
Why another EDM-experiment ?
New approach
Potentially highly competitive sensitivity (<10-29 e cm)
Neutron and proton: complementarity (CQM)
dn = 4/3 dd – 1/3 du
dp = 4/3 du – 1/3 dd
(If finite dn was found what is dp ?)
Deuteron is more than proton and neutron
dd = dn + dp + dNN
21. April 2023 Institut für Kernphysik (IKP) Folie 14
EDM at COSY – Method (I)
Spin precession in an electromagnetic field
Particles in storage ring with spin along momentum (frozen spin)
Observation of a transversal spin- component in a radial E-field ( d x E ):
ImpulsSpin
21. April 2023 Institut für Kernphysik (IKP) Folie 15
EDM at COSY – Method (II)
Proton: (a = 1.79)
B = 0:
„Magic“ momentum:
purely electrostatic ring !
21. April 2023 Institut für Kernphysik (IKP) Folie 16
EDM at COSY – Method (II)
Proton: (a = 1.79)
magic momentum: pp = 0.701 GeV/c
no magnetic field: BV = 0 T
radial E-field: ER ~ 17 MV/m
ring bending radius : RB ~ 25 m
BNL proposal: two beams, (approved) simultaneously
rotating in the sameradial electric field: cw and ccw
ring circumference:~ 240 mCourtesy: Storage Ring EDM Collaboration
http://www.bnl.gov/edm
21. April 2023 Institut für Kernphysik (IKP) Folie 17
EDM at COSY – Method (III)
Deuteron: (a = - 0.14)
No „magic“ momentum! combination of a dipole B-Feld and a radial E-Feld such, that the increased orbit compensates the trailing spin relative to the momentum:
22
2
1 a
aBcE
21. April 2023 Institut für Kernphysik (IKP) Folie 18
EDM at COSY – Options
the size of such a ring would be larger than COSY !
the size of such a ring would be similar to COSY
MagicpEDM
Ring withRB = 25 m
No magicpEDM
1.
2.
21. April 2023 Institut für Kernphysik (IKP) Folie 19
EDM at COSY – Options
the size of such a ring would easily fit into center of COSY
3.
21. April 2023 Institut für Kernphysik (IKP) Folie 20
EDM at COSY – Options
size of ring fits into center of COSY or into existing building
Furthermore: use COSY as injector and cooler
3.
21. April 2023 Institut für Kernphysik (IKP) Folie 21
EDM at COSY – Precursor Experiment
Sibirian Snake
RF Snake RF
RF Snake RF
21. April 2023 Institut für Kernphysik (IKP) Folie 22
EDM at COSY – Workshop
21. April 2023 Institut für Kernphysik (IKP) Folie 23
COSY-Jülich
… has an exciting symmetries and spin physics program
… prepares for ways to produce polarized antiproton beams
… provides test beams for FAIR/HESR/PANDA
… is the place for a (p,d 3He)-EDM search
Thank you for your attention !
Summary
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