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{sup +}e{sup -} decay channels. The production cross sections of the mesons are presented as functions of rapidity y and transverse momentum p{sub T}. The nuclear mass number dependences (A dependences) are found to be A{sup 0.710{+-}}{sup 0.021(stat){+-}}{sup 0.037(syst)} for {omega} mesons and A{sup 0.937{+-}}{sup 0.049(stat){+-}}{sup 0.018(syst)} for {phi} mesons in the region of 0.9<y<1.7 and p{sub T}<0.75 GeV/c.
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