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Title: Nonperturbative-transverse-momentum effects and evolution in dihadron and direct photon-hadron angular correlations in p + p collisions at s = 510 GeV

Journal Article · · Physical Review. D.
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Dihadron and isolated direct photon-hadron angular correlations are measured in p þ ffiffiffi p collisions at s p ¼ 510 GeV. Correlations of charged hadrons of 0.7 < pT < 10 GeV=c with π0 mesons of 4 < pT < 15 GeV=c or isolated direct photons of 7 < pT < 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 pout perpendicular to the axis of the trigger particle, which is the high-pT direct photon or π0. Nonperturbative evolution effects are extracted from Gaussian fits to the away-side inclusivecharged- hadron yields for different trigger-particle transverse momenta (ptrig T ). The Gaussian widths and root mean square of pout are reported as a function of the interaction hard scale ptrig T to investigate possible transverse-momentum-dependent evolution differences between the π0-h and direct photon-h correlations and factorization breaking effects. The widths are found to decrease with ptrig T , 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 þ p collisions. This behavior is in contrast to Drell-Yan and semi-inclusive deep-inelastic scattering measurements.

Research Organization:
Brookhaven National Laboratory (BNL), Upton, NY (United States); Univ. of California, Berkeley, CA (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Nuclear Physics (NP); USDOE National Nuclear Security Administration (NNSA), Office of Defense Nuclear Nonproliferation
Contributing Organization:
PHENIX Collaboration
Grant/Contract Number:
SC0012704; NA0003180
OSTI ID:
1354635
Alternate ID(s):
OSTI ID: 1349774; OSTI ID: 1407967
Report Number(s):
BNL-113778-2017-JA; PRVDAQ
Journal Information:
Physical Review. D., Vol. 95, Issue 7; ISSN 2470-0010
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 11 works
Citation information provided by
Web of Science

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