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Near threshold production of pseudoscalar mesons at the COSY-11 facility
Paweł Moskalon behalf of the COSY-11 collaboration
NSTAR 2007, Bonn 07.10.2007
Jagellonian University, Cracow, Poland Research Centre Jülich, Germany
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
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)
COoler SYnchrotron COSY
COSY-11Clustertarget
driftchambers
scintillator
scintillator
dipoledipole
beambeam
KK--
ppppKK++drift chambersdrift chambers
S1S1
silicon pads + scintillatorsilicon pads + scintillator
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 = dVps |M|2F
1
|M|2 ~ |M0|2 |MFSI|2
HYPERON PRODUCTION
super cycle
σ = dVps |M|2F
1
|M|2 ~ |M0|2 |MFSI|2
dynamics |M0|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.
σ = dVps |M|2F
1
|M|2 ~ |M0|2 |MFSI|2
|MFSI|2 ~ |Mpp|2 |Mp1η|2 |Mp2η|2
dynamics |M0|2
interaction σ (Q)
CELSIUSWASA/CELSIUS: H. Calen et al., Phys. Lett. B 366 (1996) 39.WASA/CELSIUS: H. Calen et al., Phys. Rev. Lett. 79 (1997) 2642.
COSYCOSY-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.
SATURNEDISTO/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.
•COSY-11: P. M. et al., Phys. Rev. C 69 (2004) 025203.
EXPERIMENT Q = 15.5 MeV SIMULATION SIMULATION
EXPERIMENT Q = 15.5 MeV EXPERIMENT Q = 4.5 MeVEXPERIMENT Q = 10 MeV
- 3He interaction
• dp 3He above 3He- threshold
• dp 3He 3He o below 3He- 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
Internal beam: ~ 3x1010 deuterons
Δf= 0.2 MHz Δp = 1.7 MeV/cΔQ = 0.4 MeV
Frequency spectrum
t
Pbeam
[MeV/c]
Slow ramping
5 min
3099
3179
Q(dp3He ) [MeV]
9
0
-10
Missing mass
TOT (dp 3He)
COSY-11: J. Smyrski et al., nucl-ex/0702043
Test measurement of the p n → p n η
Integrated Luminosity = 2 ·1035 cm-2
p n → p n η’ Integrated Lumonosity from runs in 2004/2006 ≈ 100 · 1035 cm-2
Analysis in progress
•COSY-11: P. M. et al., J. Phys. G 32 (2006) 629.