f- meson production in pN collisions close to threshold Yoshikazu Maeda On behalf of the ANKE collaboration Research Center Jülich, Germany and Research Center for Nuclear Physics, Osaka Univ. ppgppf PRL96,242301(2006) pngdf To be published in PRL nucl-ex/0607001

Physics case OZI rule Rf/w= sf / sw = tan2 Dq = 4.2×10-3 J.Ellis et al Phys. Let. B353(1995)319-328 pp annihilation at LEAR Rf/w ≈ 100×ROZI gSpin triplet dominance C.Amster, Rev.Mod.Phys.70(1998) A.I. Titov et al Phys. Rev. C59(1999)999

f/w-meson production in NN collisions New data pngdf g Isospin-spin singlet state of Rf/w 　　　　　　　　　　　　　　　　　　　　　　　　Production mechanisms. pp collision at =83 MeV 　 Rf/w≈7×ROZI (DISTO,TOF) Higher partial wave! F. Balesta et al., Phys. Rev. C63(2001) 024004 S.Abd El-Samad et al.,Phys Lett. B522,(2001)16

COSY-ANKE COSY beam COoler SYnchrotron ppgppf 2.83 GeV (76 MeV), Feb02 2.70 GeV (35 MeV), Apr02 2.65 GeV,(19 MeV), Jan04 pngdf 2.65 GeV, Feb04 COSY beam Apparatus for Studies of Nucleon and Kaon Ejectiles S. Barsov et al., Nucl. Instr. Meth. A462(2001)364 COoler SYnchrotron proton,deuteron unpolarized, polarized beam P = 0.294-3.7 GeV/c

Particle identification TOF Missing mass 　 ppgpK+K- p 　 pdgdK+K- p

Missing mass distribution pp gpK+K- X pd gdK+K- X

Invariant mass distribution for ppgppf

Invariant mass distribution for pngdf Spectator model e (pn) = S1/2[df] – mf - md

Total cross section for f-meson production in pN collisions

Differential distribution ppgppf pngdf

f/w-cross section ratio Better data for pngdw! WASA at COSY ppgppf F. Balestra et al., Phys. Rev. C63(2001) 024004 Rs(pn) ~ Rt(pp) ppgppw F.Hibou et al.,Phys. Rev. Lett. 83,(1999)492 S.Abd El-Samad et al.,Phys Lett. B522,(2001)16 pngdf S. Barsov et al., Eur. Phys. J. A21, 521 (2004)

Summary f – meson production in pp channel at 19, 35 and 76 MeV. 3P1g1S0 s R(pp) = 8 ROZI First data of s(pngdf) at e = 0 – 80 MeV. s (pn)/s(pp) f meson p-wave Rs(pn) ~ Rt(pp)

Luminosity +-5% Target density measurement by frequency shift of COSY pd scattering (elastic+inelastic) Glauber model calculation by Yuri N. Uzikov d Systematical uncertainty 15% +-5%

meson production r(ppz)j r(dz) ? Since Vector meson? PS meson r(ppm) << r(dm)

v meson production in pN collisions close to threshold

2.65 GeV FSI(pp), W(vtK+K-)= a cos2qk + b sin2qk Phase space distribution for non-resonant K+K- production 2.65 GeV

a cos2qk + b sin2qk