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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
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SYSNO ASEP 0582480 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Článek ve WOS Title Measurement 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, ORCIDNumber of authors 360 Article number 251901 Source Title Physical Review Letters. - : American Physical Society - ISSN 0031-9007
Roč. 130, č. 25 (2023)Number of pages 8 s. Language eng - English Country US - United States Keywords calorimeter ; electromagnetic ; asymmetry ; quantum chromodynamics ; PHENIX Subject RIV BF - Elementary Particles and High Energy Physics OECD category Particles and field physics Method of publishing Open access Institutional support FZU-D - RVO:68378271 UT WOS 001026290400006 EID SCOPUS 85164137210 DOI 10.1103/PhysRevLett.130.251901 Annotation We 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. Workplace Institute of Physics Contact Kristina Potocká, potocka@fzu.cz, Tel.: 220 318 579 Year of Publishing 2024 Electronic address https://hdl.handle.net/11104/0350966
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