Abstract
Results on phi meson production in inelastic p + p collisions at CERN SPS energies are presented. They are derived from data collected by the NA61/SHINE fixed target experiment, by means of invariant mass spectra fits in the phi rightarrow K^+ K^- decay channel. They include the first ever measured double differential spectra of phi mesons as a function of rapidity y and transverse momentum p_{text {T}} for proton beam momenta of 80 , hbox {GeV}/c and 158 , hbox {GeV}/c, as well as single differential spectra of y or p_{text {T}} for beam momentum of 40 , hbox {GeV}/c. The corresponding total phi yields per inelastic p + p event are obtained. These results are compared with existing data on phi meson production in p + p collisions. The comparison shows consistency but superior accuracy of the present measurements. The emission of phi mesons in p + p reactions is confronted with that occurring in mathrm{Pb} + mathrm{Pb} collisions, and the experimental results are compared with model predictions. It appears that none of the considered models can properly describe all the experimental observations.
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