Nuclear mass number dependence of inclusive production of omega and phi mesons in 12 GeV p + A collisions
T. Tabaru, H. En'yo, R. Muto, M. Naruki, S. Yokkaichi, J. Chiba, M. Ieiri, O. Sasaki, M. Sekimoto, K. H. Tanaka, H. Funahashi, Y. Fukao, M. Kitaguchi, M. Ishino, H. Kanda, S. Mihara, T. Miyashita, K. Miwa, T. Murakami, T. Nakura, F. Sakuma, M. Togawa, S. Yamada, Y. Yoshimura, H. Hamagaki, K. Ozawa
Abstract
The inclusive production of omega and phi mesons is studied in the backward region of the interaction of 12 GeV protons with polyethylene, carbon, and copper targets. The mesons are measured in e+ e- decay channels. The production cross sections of the mesons are presented as functions of rapidity y and transverse momentum pT. The nuclear mass number dependences (A dependences) are found to be A0.710 +/- 0.021(stat) +/- 0.037(syst) for omega mesons and A0.937 +/- 0.049(stat) +/- 0.018(syst) for phi mesons in the region of 0.9 < y < 1.7 and pT < 0.75 GeV/c.
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