Measuring the parton content of the photon at the DESY ep collider HERA

Journal Article · Sun Jan 01 04:00:00 EST 1989 · Phys. Rev. D; (United States)

DOI:https://doi.org/10.1103/PhysRevD.39.169· OSTI ID:6537405

Drees, M; Godbole, R M

We discuss the possibility to measure the parton, and especially gluon, content of the photon at the forthcoming DESY ep collider HERA. We first reemphasize that the production of two jets with high transverse momentum p/sub T/ is dominated by events where the photon is resolved into quarks and gluons for p/sub T/approx. <40 GeV. We then show that these ''resolved'' contributions, and in particular those that are initiated by a gluon from the photon, are especially important at large jet rapidities. Rapidity distributions also allow us to isolate the direct photon-gluon fusion contributions to bb-bar production. This makes it possible to use this process to determine the gluon content of the proton. However, a direct measurement of the gluon content of the photon will only be possible if the spectator jet from the photon can be detected. We find that this jet typically has an energy of 10--12 GeV and estimate its opening angle to be around 15/sup 0/, which should allow for its detection.

• Research Organization: Physics Department, University of Wisconsin, Madison, Wisconsin 53706
• OSTI ID: 6537405
• Journal Information: Phys. Rev. D; (United States), Journal Name: Phys. Rev. D; (United States) Vol. 39:1; ISSN PRVDA
• Country of Publication: United States
• Language: English

Related Subjects

645101* -- High Energy Physics-- Particle Interactions &amp; Properties-Experimental-- Electromagnetic Interactions &amp; Properties
645400 -- High Energy Physics-- Field Theory
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
ACCELERATORS
ANGULAR DISTRIBUTION
COMPOSITE MODELS
CROSS SECTIONS
CYCLIC ACCELERATORS
DESY
DISTRIBUTION
ELECTRON-NUCLEON INTERACTIONS
ELECTRON-PROTON INTERACTIONS
ELEMENTARY PARTICLES
ENERGY RANGE
FIELD THEORIES
FUNCTIONS
GEV RANGE
GEV RANGE 10-100
GLUONS
HERA STORAGE RING
INTERACTIONS
JET MODEL
LEPTON-BARYON INTERACTIONS
LEPTON-HADRON INTERACTIONS
LEPTON-NUCLEON INTERACTIONS
LINEAR MOMENTUM
MASSLESS PARTICLES
MATHEMATICAL MODELS
PARTICLE IDENTIFICATION
PARTICLE INTERACTIONS
PARTICLE MODELS
PARTICLE PROPERTIES
PARTICLE RAPIDITY
PARTON MODEL
PARTONS
PERTURBATION THEORY
PHOTONS
POSTULATED PARTICLES
QUANTUM CHROMODYNAMICS
QUANTUM FIELD THEORY
QUARKS
STORAGE RINGS
STRUCTURE FUNCTIONS
SYNCHROTRONS
TRANSVERSE MOMENTUM