AI Article Synopsis
- The study focuses on the transverse momentum spectra of various particles in proton-proton (p+p) and gold-gold (Au+Au) collisions at a specific energy level.
- Perturbative QCD calculations align with the pion spectra in p+p collisions but fail to accurately predict the spectra for kaons and protons/antiprotons.
- The decreasing ratios of antiparticles to particles observed with increasing transverse momentum suggest differing contributions from quark and gluon jets in high-energy interactions, with similar hadron abundances in Au+Au as in p+p despite expectations of parton energy loss effects.
Article Abstract
We report transverse momentum (p(T)≤15 GeV/c) spectra of π(±), K(±), p, p[over ¯], K(S)(0), and ρ(0) at midrapidity in p+p and Au+Au collisions at √S(NN)=200 GeV. Perturbative QCD calculations are consistent with π(±) spectra in p+p collisions but do not reproduce K and p(p[over ¯]) spectra. The observed decreasing antiparticle-to-particle ratios with increasing p(T) provide experimental evidence for varying quark and gluon jet contributions to high-p(T) hadron yields. The relative hadron abundances in Au+Au at p(T)≳8 GeV/c are measured to be similar to the p+p results, despite the expected Casimir effect for parton energy loss.
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| http://dx.doi.org/10.1103/PhysRevLett.108.072302 | DOI Listing |
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