Author/Authors :
M. Wurzinger، نويسنده , , R Siebert، نويسنده , , R Jahn، نويسنده , , A Kozela، نويسنده , , T von Oepen، نويسنده , , F Roudot، نويسنده , , J Bisplinghoff، نويسنده , , M.-A Duval، نويسنده , , J Ernst، نويسنده , , R Frascaria، نويسنده , , F Hinterberger، نويسنده , , R Joosten، نويسنده , , C Lippert، نويسنده , , F Plouin، نويسنده , , W Spang، نويسنده , , E Warde، نويسنده ,
Abstract :
The production of η′ (958) and φ (1020) mesons has been studied very close to threshold in the inclusive p d → 3He X reaction. The complicated phase space acceptance problem caused by rapidly changing kinematics close to threshold has been carefully treated. The measured averaged squared amplitudes |f|2 at threshold are 0.9 and 2.4 nb/sr for the η′ and φ meso Our results are in remarkable agreement with predictions of a two-step model, which uses existing π− p → n X data as input. However the ratio of φ to ω production seems at variance with naïve expectations based on the Okubo-Zweig-Iizuka rule.
Keywords :
? meson , Two-step model , ?? meson , Near threshold f.s.i. , OZI rule , View the MathML source content of the proton , Threshold excitation curve
