Jet properties from dihadron correlations inp+pcollisions ats=200 GeV
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Abstract
The properties of jets produced in $p+p$ collisions at $\sqrt{s}=200\text{ }\text{ }\mathrm{GeV}$ are measured using the method of two-particle correlations. The trigger particle is a leading particle from a large transverse momentum jet while the associated particle comes from either the same jet or the away-side jet. Analysis of the angular width of the near-side peak in the correlation function determines the jet-fragmentation transverse momentum ${j}_{\mathrm{T}}$. The extracted value, $\sqrt{⟨{j}_{\mathrm{T}}^{2}⟩}=585\ifmmode\pm\else\textpm\fi{}6(\mathrm{stat})\ifmmode\pm\else\textpm\fi{}15(\mathrm{sys})\text{ }\text{ }\mathrm{MeV}/c$, is constant with respect to the trigger particle transverse momentum, and comparable to the previous lower $\sqrt{s}$ measurements. The width of the away-side peak is shown to be a convolution of ${j}_{\mathrm{T}}$ with the fragmentation variable, $z$, and the partonic transverse momentum, ${k}_{\mathrm{T}}$. The $⟨z⟩$ is determined through a combined analysis of the measured ${\ensuremath{\pi}}^{0}$ inclusive and associated spectra using jet-fragmentation functions measured in ${e}^{+}{e}^{\ensuremath{-}}$ collisions. The final extracted values of ${k}_{\mathrm{T}}$ are then determined to also be independent of the trigger particle transverse momentum, over the range measured, with value of $\sqrt{⟨{k}_{\mathrm{T}}^{2}⟩}=2.68\ifmmode\pm\else\textpm\fi{}0.07(\mathrm{stat})\ifmmode\pm\else\textpm\fi{}0.34(\mathrm{sys})\text{ }\text{ }\mathrm{GeV}/c$.
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