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

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Adare , A , Kim , D J , Krizek , F , Novitzky , N , Rak , J & PHENIX Collaboration 2017 , ' Nonperturbative-transverse-momentum effects and evolution in dihadron and direct photon-hadron angular correlations in p plus p collisions at root s=510 GeV ' , Physical Review D , vol. 95 , no. 7 , 072002 . https://doi.org/10.1103/PhysRevD.95.072002

Title: Nonperturbative-transverse-momentum effects and evolution in dihadron and direct photon-hadron angular correlations in p plus p collisions at root s=510 GeV
Author: Adare, A.; Kim, D. J.; Krizek, F.; Novitzky, N.; Rak, J.; PHENIX Collaboration
Other contributor: University of Helsinki, Helsinki Institute of Physics
University of Helsinki, Helsinki Institute of Physics
University of Helsinki, Helsinki Institute of Physics
University of Helsinki, Helsinki Institute of Physics
Date: 2017-04-04
Language: eng
Number of pages: 19
Belongs to series: Physical Review D
ISSN: 2470-0010
DOI: https://doi.org/10.1103/PhysRevD.95.072002
URI: http://hdl.handle.net/10138/307867
Abstract: Dihadron and isolated direct photon-hadron angular correlations are measured in p + p collisions at root 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(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)(trig)). The Gaussian widths and root mean square of p(out) are reported as a function of the interaction hard scale p(T)(trig) to investigate possible transverse-momentum-dependent evolution differences between the pi(0)-h(+/-) and direct photon-h(+/-) correlations and factorization breaking effects. The widths are found to decrease with p(T)(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.
Subject: SPIN PRODUCTION ASYMMETRIES
DEEP-INELASTIC SCATTERING
PROTON-PROTON COLLISIONS
FINAL-STATE INTERACTIONS
P(P)OVER-BAR COLLISIONS
JET FRAGMENTATION
BOSON PRODUCTION
COLOR COHERENCE
HARD-SCATTERING
DRELL-YAN
114 Physical sciences
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