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

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• Autor: A. Adare
• Autor: ...
• Autor: Mihael Makek; MBZ: 256122
• Autor: ...
• Autor: Nikola Vukman; MBZ: 362186
• Autor: ...
• Autor: L. Zou
• Kolaboracija: PHENIX Collaboration
• Autorova ustanova: Sveučilište u Zagrebu; Prirodoslovno-matematički fakultet; (Fizički odsjek)
• Znanstveno / umjetničko područje, polje i grana: PRIRODNE ZNANOSTI; Fizika

Sažetak (engleski)

Dihadron and isolated direct photon-hadron angular correlations are measured in p+p collisions at √s=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 + p collisions. This behavior is in contrast to Drell- Yan and semi-inclusive deep- inelastic scattering measurements.

• Ključne riječi (engleski): spin production asymmetries; deep-inelastic scattering; proton-proton collisions; final-state interactions; jet fragmentation; boson production; color coherence; hard-scattering; Drell-Yan; PHENIX
• Jezik: engleski
• Vrsta publikacije: Znanstveni rad - Izvorni znanstveni rad
• Status objave: Objavljen
• Vrsta recenzije: Recenziran - međunarodna recenzija
• Verzija publikacije: Objavljena verzija rada (izdavačev PDF)
• Naslov časopisa: Physical Review D
• Brojčani podaci: vol. 95, br. 7, 072002
• p-ISSN: 2470-0010
• e-ISSN: 2470-0029
• DOI: https://doi.org/10.1103/physrevd.95.072002
• URN:NBN: urn:nbn:hr:217:697198
• Datum objave publikacije: 2017
• URL dokumenta: https://journals.aps.org/prd/abstract/10.1103/PhysRevD.95.072002
• Vrsta resursa: Tekst
• Prava pristupa: Otvoreni pristup
• Javna napomena: © 2017 American Physical Society. Received 17 September 2016. Published 4 April 2017.
• Datum i vrijeme pohrane: 2020-02-28 20:12:17