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

PHENIX Collaboration

Research output: Contribution to journalArticlepeer-review

5 Scopus citations

Abstract

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.

Original languageEnglish
Article number251901
JournalPhysical Review Letters
Volume130
Issue number25
DOIs
StatePublished - 23 Jun 2023
Externally publishedYes

ASJC Scopus subject areas

  • General Physics and Astronomy

Fingerprint

Dive into the research topics of 'Measurement of Direct-Photon Cross Section and Double-Helicity Asymmetry at s =510 GeV in p → + p → Collisions'. Together they form a unique fingerprint.

Cite this