Nonperturbative-transverse-momentum effects and evolution in dihadron and direct photon-hadron angular correlations in $p$$+$$p$ collisions at $\sqrt{s}$=510 GeV

Abstract

Dihadron and isolated direct photon-hadron angular correlations are measured in $p$$+$$p$ collisions at $\sqrt{s}=510$ GeV. Correlations of charged hadrons of $0.7<p_T<10$ GeV/$c$ with ${\pi }^0$ mesons of $4<p_T<15$ GeV/$c$ or isolated direct photons of $7<p_T<15$ GeV/$c$ are used to study nonperturbative effects generated by initial-state partonic transverse momentum and final-state transverse momentum from fragmentation. The nonperturbative behavior is characterized by measuring the out-of-plane transverse momentum component $p_{\mathrm{out}}$ perpendicular to the axis of the trigger particle, which is the high-$p_T$ direct photon or ${\pi }^0$. Nonperturbative evolution effects are extracted from Gaussian fits to the away-side inclusive-charged-hadron yields for different trigger-particle transverse momenta ($p_T^{\mathrm{trig}}$). The Gaussian widths and root mean square of $p_{\mathrm{out}}$ are reported as a function of the interaction hard scale $p_T^{\mathrm{trig}}$ to investigate possible transverse-momentum-dependent evolution differences between the ${\pi }^0$-h${}^{\pm }$ and direct photon-h${}^{\pm }$ correlations and factorization breaking effects. The widths are found to decrease with $p_T^{\mathrm{trig}}$, which indicates that the Collins-Soper-Sterman soft factor is not driving the evolution with the hard scale in nearly back-to-back dihadron and direct photon-hadron production in $p$$+$$p$ collisions. This behavior is in contrast to Drell-Yan and semi-inclusive deep-inelastic scattering measurements.

467 authors, 20 pages, 15 figures, 1 table. Accepted for publication by Phys. Rev. D. Plain text data tables for the points plotted in figures for this and previous PHENIX publications are (or will be) publicly available at http://www.phenix.bnl.gov/papers.html

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• Nonperturbative transverse momentum broadening in dihadron angular correlations in $\sqrt{s_{NN}}=200$ GeV proton-nucleus collisions
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• Study of cold and hot nuclear matter effects on jets with direct photon triggered correlations from PHENIX
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• How hadron collider experiments contributed to the development of QCD: from hard-scattering to the perfect liquid
• Nonperturbative Transverse Momentum Effects in Dihadron and Direct Photon-Hadron Angular Correlations