Transverse momentum distributions and yields for π ± , K ± , p and p in p + p collisions at √ s = 200 and 62.4 GeV at midrapidity are measured by the PHENIX experiment at the Relativistic Heavy Ion Collider (RHIC). These data provide important baseline spectra for comparisons with identified particle spectra in heavy ion collisions at RHIC. We present the inverse slope parameter Tinv, mean transverse momentum pT and yield per unit rapidity dN/dy at each energy, and compare them to other measurements at different √ s in p + p and p + p collisions. We also present the scaling properties such as mT scaling, xT scaling on the pT spectra between different energies. To discuss the mechanism of the particle production in p + p collisions, the measured spectra are compared to nextto-leading-order or next-to-leading-logarithmic perturbative quantum chromodynamics calculations.

The PHENIX experiment at the Relativistic Heavy Ion Collider has measured the invariant differential cross section for production of K 0 S , ω, η ′ , and φ mesons in p + p collisions at √ s = 200 GeV. Measurements of ω and φ production in different decay channels give consistent results. New results for the ω are in agreement with previously published data and extend the measured pT coverage. The spectral shapes of all hadron transverse momentum distributions measured by PHENIX are well described by a Tsallis distribution functional form with only two parameters, n and T , determining the high-pT and characterizing the low-pT regions of the spectra, respectively. The values of these parameters are very similar for all analyzed meson spectra, but with a lower parameter T extracted for protons. The integrated invariant cross sections calculated from the fitted distributions are found to be consistent with existing measurements and with statistical model predictions.

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