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Measurement of Direct-Photon Cross Section and Double-Helicity Asymmetry at √s =510 GeV in p.sup.→./sup. + p.sup.→./sup. Collisions

  1. 1.
    SYSNO ASEP0582480
    Document TypeJ - Journal Article
    R&D Document TypeJournal Article
    Subsidiary JČlánek ve WOS
    TitleMeasurement of Direct-Photon Cross Section and Double-Helicity Asymmetry at √s =510 GeV in p + p Collisions
    Author(s) Abdulameer, N.J. (HU)
    Acharya, U. (US)
    Adare, A. (US)
    Vrba, Václav (FZU-D) RID, ORCID
    Number of authors360
    Article number251901
    Source TitlePhysical Review Letters. - : American Physical Society - ISSN 0031-9007
    Roč. 130, č. 25 (2023)
    Number of pages8 s.
    Languageeng - English
    CountryUS - United States
    Keywordscalorimeter ; electromagnetic ; asymmetry ; quantum chromodynamics ; PHENIX
    Subject RIVBF - Elementary Particles and High Energy Physics
    OECD categoryParticles and field physics
    Method of publishingOpen access
    Institutional supportFZU-D - RVO:68378271
    UT WOS001026290400006
    EID SCOPUS85164137210
    DOI10.1103/PhysRevLett.130.251901
    AnnotationWe present measurements of the cross section and double-helicity asymmetry ALL of direct-photon production in p→+p→ collisions at s=510  GeV. The measurements have been performed at midrapidity (|η|<0.25) with the PHENIX detector at the Relativistic Heavy Ion Collider. At relativistic energies, direct photons are dominantly produced from the initial quark-gluon hard scattering and do not interact via the strong force at leading order. Therefore, at s=510  GeV, where leading-order-effects dominate, these measurements provide clean and direct access to the gluon helicity in the polarized proton in the gluon-momentum-fraction range 0.02<x<0.08, with direct sensitivity to the sign of the gluon contribution.
    WorkplaceInstitute of Physics
    ContactKristina Potocká, potocka@fzu.cz, Tel.: 220 318 579
    Year of Publishing2024
    Electronic addresshttps://hdl.handle.net/11104/0350966
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