Nonperturbative transverse-momentum-dependent effects in dihadron and direct photon-hadron angular correlations in p+p collisions at √s=200 GeV

0519342 - FZÚ 2020 RIV US eng J - Journal Article
Aidala, C. - Akiba, Y. - Alfred, M. - Vrba, Václav … Total 293 authors
Nonperturbative transverse-momentum-dependent effects in dihadron and direct photon-hadron angular correlations in p+p collisions at √s=200 GeV.
Physical Review D. Roč. 98, č. 7 (2018), s. 1-13, č. článku 072004. ISSN 2470-0010. E-ISSN 2470-0029
Institutional support: RVO:68378271
Keywords : factorization: (violation) * dihadron: angular correlation * initial state: (transverse momentum) * final state: (transverse momentum) * 510 GeV
OECD category: Particles and field physics
Impact factor: 4.368, year: 2018
Method of publishing: Open access

Dihadron and isolated direct photon-hadron angular correlations are measured in p+p collisions at s=200  GeV. The correlations are sensitive to nonperturbative initial-state and final-state transverse momenta kT and jT in the azimuthal nearly back-to-back region Δϕ∼π. To have sensitivity to small transverse momentum scales, nonperturbative momentum widths of pout, the out-of-plane transverse-momentum component perpendicular to the trigger particle, are measured. In this region, the evolution of pout can be studied when several different hard scales are measured. These widths are used to investigate possible effects from transverse-momentum-dependent factorization breaking. When accounting for the longitudinal-momentum fraction of the away-side hadron with respect to the near-side trigger particle, the widths are found to increase with the hard scale this is qualitatively similar to the observed behavior in Drell-Yan and semi-inclusive deep-inelastic scattering interactions.

Permanent Link: http://hdl.handle.net/11104/0304337