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

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
김용균
Keywords
FINAL-STATE INTERACTIONS; SINGLE-SPIN ASYMMETRIES; P(P)OVER-BAR COLLISIONS; PROTON COLLISIONS; JET FRAGMENTATION; COLOR COHERENCE; HARD-SCATTERING; DRELL-YAN; PIONS; COLLINS
Issue Date
2017-04
Publisher
AMER PHYSICAL SOC
Citation
PHYSICAL REVIEW D, v. 95, no. 7, Article no. 072002
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.
URI
https://journals.aps.org/prd/abstract/10.1103/PhysRevD.95.072002https://repository.hanyang.ac.kr/handle/20.500.11754/113759
ISSN
2470-0010; 2470-0029
DOI
10.1103/PhysRevD.95.072002
Appears in Collections:
COLLEGE OF ENGINEERING[S](공과대학) > NUCLEAR ENGINEERING(원자력공학과) > Articles
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