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

Journal Article · · Physical Review. D.
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Dihadron and isolated direct photon-hadron angular correlations are measured in p+p collisions at $$\sqrt{s}$$=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, where factorization is predicted to hold. The momentum widths are also studied as a function of center-of-mass energy by comparing to previous measurements at $$\sqrt{s}$$ =510 GeV. The nonperturbative jet widths also appear to increase with $$\sqrt{s}$$ at a similar xT, which is qualitatively consistent to similar measurements in Drell-Yan interactions. Future detailed global comparisons between measurements of processes where transverse-momentum-dependent factorization is predicted to hold and be broken will provide further insight into the role of color in hadronic interactions.

Research Organization:
Brookhaven National Laboratory (BNL), Upton, NY (United States); Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Nuclear Physics (NP)
Contributing Organization:
PHENIX Collaboration
Grant/Contract Number:
AC02-05CH11231; SC0012704
OSTI ID:
1478568
Alternate ID(s):
OSTI ID: 1478484; OSTI ID: 1582613
Report Number(s):
BNL-209309-2018-JAAM; PRVDAQ; 072004
Journal Information:
Physical Review. D., Journal Name: Physical Review. D. Vol. 98 Journal Issue: 7; ISSN 2470-0010
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 2 works
Citation information provided by
Web of Science

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