Measurement of Direct-Photon Cross Section and Double-Helicity Asymmetry at √s=510 GeV in (p)over-right-arrow + (p)over-right-arrow Collisions
Autor
Abdulameer, N. J.
Acharya, U.
Adare, A.
Aidala, C.
Ajitanand, N. N.
Akiba, Y.
Akimoto, R.
Gallus, P.
Slunecka, Miloslav
Tomasek, Michal
Virius, Miloslav
Vrba, Vaclav
Datum vydání
2023Publikováno v
Physical Review LettersRočník / Číslo vydání
130 (25)ISBN / ISSN
ISSN: 0031-9007Metadata
Zobrazit celý záznamKolekce
Tato publikace má vydavatelskou verzi s DOI 10.1103/PhysRevLett.130.251901
Abstrakt
We present measurements of the cross section and double-helicity asymmetry ALL of direct-photon production in p ⃗ + p ⃗ collisions at ffis ffi p = 510 GeV. The measurements have been performed at midrapidity (I & eta;I < 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 ffiffistrong force at leading order. Therefore, at p 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.
Klíčová slova
BNL, RHIC, PHENIX, Double-Helicity, SQUARE ROOTs=510 GeV, Collisions
Trvalý odkaz
https://hdl.handle.net/20.500.14178/2347Licence
Licence pro užití plného textu výsledku: Creative Commons Uveďte původ 4.0 International