1979•OSTI OAI (U.S. Department of Energy Office of Scientific and Technical Information)Requires access
Investigation of the reaction. pi. /sup -/p. -->. eta'n in the momentum region from 15 to 40 GeV/c
W.D. Apel, K.H. Augenstein, E. Bertolucci, Marco L. Vincelli, Sergey V. Donskov, R. A. Johnson, A.V. Inyakin, Vassili Kachanov, M. Quaglia, W. Kittenberger, R.N. Krasnokutskii, M. Krueger, G. Leder, A.A. Lednev, I. Mannelli, Yu.V. Mikhailov, Hubert Mueller, Y.D. Prokoshkin, G.M. Pierazzini, F. Sergiampietri, G. Sigurdsson, Angelo Scribano, D. Schinzel, H. Schneider, M. Steuer, R.S. Shuvalov
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Abstract
The cross sections of the reaction ..pi../sup -/p..-->..eta'(958)n, eta'--2..gamma.. were measured at the momenta 15, 20, 25, 30, and 40 GeV/c. The experiments were performed on the 70-GeV IHEP accelerator using the NICE 648-channel hodoscopic spectrometer. A total of 6000 eta' mesons were registered. The observed dip of the differential cross sections of the reactions ..pi..'p..-->..eta'n and ..pi../sup -/p..-->..etan as functions of t are identical. The ratio R(eta'/eta)/sub t/=0=0.55 +- 0.06 of the cross sections of these reactions yields the angle ..beta..=-(18.2 +- 1.4)/sup 0/ of the singlet-octet mixing of the pseudoscalar mesons.