Squark contributions to photon structure functions and positivity constraints

Journal Article · Sat Oct 01 00:00:00 EDT 2011 · Physical Review. D, Particles Fields

DOI:https://doi.org/10.1103/PHYSREVD.84.074031· OSTI ID:21607789

Kitadono, Yoshio; Yoshida, Yutaka; Sahara, Ryo; Uematsu, Tsuneo ^[1]

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1. High Energy Accelerator Research Organization (KEK), 1-1 Oh-ho, Tsukuba, Ibaraki 305-0801 (Japan)

Photon structure functions in supersymmetric QCD are investigated in terms of the parton model where squark contributions are evaluated. We calculate the eight virtual photon structure functions by taking the discontinuity of the squark massive one-loop diagrams of the photon-photon forward amplitude. The model-independent positivity constraints derived from the Cauchy-Schwarz inequalities are satisfied by the squark parton model calculation and actually the two equality relations hold for the squark contribution. We also show that our polarized photon structure function g{sub 1}{sup {gamma}} for the real photon leads to the vanishing first moment sum rule, and the constraint |g{sub 1}{sup {gamma}}|{<=}F{sub 1}{sup {gamma}} is satisfied by the real photon. We also discuss a squark signature in the structure function W{sub TT}{sup {tau}}.

• OSTI ID: 21607789
• Journal Information: Physical Review. D, Particles Fields, Vol. 84, Issue 7; Other Information: DOI: 10.1103/PhysRevD.84.074031; (c) 2011 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA); ISSN 0556-2821
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
AMPLITUDES
LIMITING VALUES
PHOTONS
QUANTUM CHROMODYNAMICS
QUARKS
SPARTICLES
STRUCTURE FUNCTIONS
SUM RULES
SUPERSYMMETRY
BOSONS
ELEMENTARY PARTICLES
EQUATIONS
FERMIONS
FIELD THEORIES
FUNCTIONS
MASSLESS PARTICLES
POSTULATED PARTICLES
QUANTUM FIELD THEORY
SYMMETRY