Polarization effects of supersymmetric QCD in large-p/sub T/ direct photon production

Journal Article · Sun Apr 01 04:00:00 EST 1984 · Phys. Rev. D; (United States)

DOI:https://doi.org/10.1103/PhysRevD.29.1362· OSTI ID:6897459

Antoniadis, I; Contogouris, A P; Tanaka, H

The linear polarization P (approx. perpendicular minus parallel to the scattering plane) of large-p/sub T/ direct photons from unpolarized hadrons is considered. Contrary to standard QCD, where O(1) P vanishes, and to O(..cap alpha../sub s/) P is very small and changes sign at angle theta/sub c.m./ = 90/sup 0/, it is shown that supersymmetric theories (involving scalar quarks and light gluinos), already to O(1), imply a substantial and positive P through a wide range of angles including theta/sub c.m./ = 90/sup 0/. As an illustration, P is calculated for p-barp..--> gamma..+X at collider energy (..sqrt..s = 540 GeV) and p/sub T/> or approx. =30 GeV, with scalar-quark mass 20 GeV; we find Papprox.8--3 %, decreasing as p/sub T/ increases. The significance of the results as a test of the short-distance structure of supersymmetric QCD (valence part of the scalar-quark distribution) is discussed. The distribution of a top quark with mass 35 GeV is also determined, and its contribution to P is found to be very small.

• Research Organization: Centre de Physique Theorique de l'Ecole Polytechnique, 91128 Palaiseau Cedex, France
• OSTI ID: 6897459
• Journal Information: Phys. Rev. D; (United States), Journal Name: Phys. Rev. D; (United States) Vol. 29:7; ISSN PRVDA
• Country of Publication: United States
• Language: English

Related Subjects

645202 -- High Energy Physics-- Particle Interactions & Properties-Theoretical-- Electromagnetic Interactions & Properties
645204 -- High Energy Physics-- Particle Interactions & Properties-Theoretical-- Strong Interactions & Properties
645400* -- High Energy Physics-- Field Theory
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
ANGULAR DISTRIBUTION
CROSS SECTIONS
DIFFERENTIAL CROSS SECTIONS
DISTRIBUTION
ELEMENTARY PARTICLES
FIELD THEORIES
GLUONS
HADRON-HADRON INTERACTIONS
INTERACTIONS
LINEAR MOMENTUM
MASSLESS PARTICLES
PARTICLE INTERACTIONS
PARTICLE PRODUCTION
PHOTONS
POLARIZATION
POSTULATED PARTICLES
QUANTUM CHROMODYNAMICS
QUANTUM FIELD THEORY
QUARKS
SUPERSYMMETRY
SYMMETRY
TRANSVERSE MOMENTUM