1. Near threshold production of pseudoscalar mesons at the COSY-11 facility Paweł Moskal on behalf of the COSY-11 collaboration NSTAR 2007, Bonn 07.10.2007 Jagellonian University, Cracow, Poland Research Centre Jülich, Germany

2. D. Grzonka, K. Kilian, W.Oelert, J. Ritman, T. Sefzick, M. Wolke, P. Wüstner IKP & ZEL, Research Centre Jülich, Germany COSY-11 COLLABORATION E. Czerwiński, R. Czyżykiewicz, D. Gil, M. Janusz, L. Jarczyk, B. Kamys, P. Klaja, P. Moskal, C. Piskor-Ignatowicz, J. Przerwa, B. Rejdych, M. Silarski, J. Smyrski H.-H. Adam, A. Khoukaz, A. Täschner M. Siemaszko, W. Zipper A. Budzanowski IP, Jagellonian University, Cracow, Poland IKP, Westfälische Wilhems-Universität Münster, Germany I P, University of Silesia, Katowice, Poland INP, Cracow, Poland

4. COoler SYnchrotron COSY WASA polarised and unpolarised proton and deuteron beams stochastic and electron cooling momentum range: 600 – 3700 MeV/c meson production up to  (1020)

5. COoler SYnchrotron COSY

6. COSY-11 Clustertarget driftchambers scintillator

7. dipole beam K-K-K-K- p p K+K+K+K+ drift chambers S1 silicon pads + scintillator

10. COSY-11: C. Quentmeier et al., Phys. Lett. B 515 (2001) 276. COSY-11: P. Winter et al., Phys. Lett. B 635 (2006) 23. DISTO: F. Balestra et al., Phys. Rev. C 63 (2001) 024004. σ = dV ps |M| 2 |M| 2 ~ |M 0 | 2 |M FSI | 2

13. HYPERON PRODUCTION super cycle

14. σ = dV ps |M| 2 |M| 2 ~ |M 0 | 2 |M FSI | 2 dynamics  |M 0 | 2 interaction  σ (Q) COSY-11: T. Rożek et al., Phys. Lett. B 643 (2006) 251. COSY-11: P. Kowina et al., Eur. Phys. J. A 22 (2004) 293. COSY-11: S. Sewerin et al., Phys. Rev. Lett. 83 (1999) 682. COSY-11: J. Balewski et al., Eur. Phys. J. A 2 (1998) 1. COSY-11: J. Balewski et al., Phys. Lett. B 420 (1998) 211. COSY-11: J. Balewski et al., Phys. Lett. B 388 (1996) 859.

16. σ = dV ps |M| 2 |M| 2 ~ |M 0 | 2 |M FSI | 2 |M FSI | 2 ~ |M pp | 2 |M p1η | 2 |M p2η | 2 dynamics  |M 0 | 2 interaction  σ (Q) CELSIUS WASA/CELSIUS: H. Calen et al., Phys. Lett. B 366 (1996) 39. WASA/CELSIUS: H. Calen et al., Phys. Rev. Lett. 79 (1997) 2642. COSY COSY-11: A. Khoukaz et al., Eur. Phys. J. A 20 (2004) 345. COSY-11: P. M. et al., Phys. Rev. C 69 (2004) 025203. COSY-11: P. M. et al., Phys. Lett. B 482 (2000) 356. COSY-11: P. M. et al., Phys. Lett. B 474 (2000) 416. COSY-11: J. Smyrski et al., Phys. Lett. B 474 (2000) 182. COSY-11: P. M. et al., Phys. Rev. Lett. 80 (1998) 3202. SATURNE DISTO/SATURNE: F. Balestra et al., Phys. Lett. B 491 (2000) 29. SPES/SATURNE: F. Hibou et al., Phys Lett. B 438 (1998) 41. PINOT/SATURNE: E. Chiavassa et al., Phys. Lett. B 322 (1994) 270. SPES/SATURNE: A. M. Bergdold et al., Phys. Rev. D 48 (1993) R2969. SPES/SATURNE: R. Wurzinger et al., Phys. Lett. B 374 (1996) 283.

17. COSY-11: P. M. et al., Phys. Rev. C 69 (2004) 025203. EXPERIMENT Q = 15.5 MeV SIMULATION EXPERIMENT Q = 15.5 MeVEXPERIMENT Q = 4.5 MeV EXPERIMENT Q = 10 MeV

21.  - 3 He interaction dp  3 He  above 3 He-  threshold dp  3 He   3 He  o below 3 He-  threshold  d p  o "  pp p  - "  dp " DEUTERON BEAM COSY-11: J. Smyrski et al., Acta Phys. Slov. 56 (2006) 213 [nucl-ex/0603023] COSY-11: J. Smyrski et al., nucl-ex/0702043

22. Internal beam: ~ 3x10 10 deuterons Δf= 0.2 MHz  Δp = 1.7 MeV/c ΔQ = 0.4 MeV Frequency spectrum t P beam [MeV/c] Slow ramping 5 min 3099 3179 Q( dp  3He  ) [MeV] 9 0 -10

23. Missing mass  

24.  TOT (dp  3 He  ) COSY-11: J. Smyrski et al., nucl-ex/0702043

28. Test measurement of the p n → p n η Integrated Luminosity = 2 ·10 35 cm -2 p n → p n η’ Integrated Lumonosity from runs in 2004/2006 ≈ 100 · 10 35 cm -2 Analysis in progress COSY-11: P. M. et al., J. Phys. G 32 (2006) 629.