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Identified hadron compositions in p+p and Au+Au collisions at high transverse momenta at $\sqrt{s_{_{NN}}} = 200$ GeV
- Source :
- Physical Review Letters, Physical Review Letters, American Physical Society, 2012, 108, pp.072302. ⟨10.1103/PhysRevLett.108.072302⟩
- Publication Year :
- 2011
- Publisher :
- arXiv, 2011.
-
Abstract
- We report transverse momentum ($p_{T} \leq15$ GeV/$c$) spectra of $\pi^{\pm}$, $K^{\pm}$, $p$, $\bar{p}$, $K_{S}^{0}$, and $\rho^{0}$ at mid-rapidity in p+p and Au+Au collisions at $\sqrt{s_{_{NN}}}$ = 200 GeV. Perturbative QCD calculations are consistent with $\pi^{\pm}$ spectra in p+p collisions but do not reproduce $K$ and $p(\bar{p})$ 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 $p_{T}{}^{>}_{\sim}8$ GeV/$c$ are measured to be similar to the p+p results, despite the expected Casimir effect for parton energy loss.<br />Comment: 6 pages, 3 figures, published at PRL
Details
- ISSN :
- 00319007 and 10797114
- Database :
- OpenAIRE
- Journal :
- Physical Review Letters, Physical Review Letters, American Physical Society, 2012, 108, pp.072302. ⟨10.1103/PhysRevLett.108.072302⟩
- Accession number :
- edsair.doi.dedup.....30737421a8451d50ba3e5c62c55e6d70
- Full Text :
- https://doi.org/10.48550/arxiv.1110.0579