Beyond leading-order perturbative QCD corrections to. gamma gamma -->. M/sup +/M/sup -/ (M =. pi. ,K)

Journal Article · Thu Jan 01 04:00:00 EST 1987 · Phys. Rev. D; (United States)

DOI:https://doi.org/10.1103/PhysRevD.35.80· OSTI ID:6812554

Niic-acute-accent, B

Next-to-leading-order perturbative QCD predictions are obtained for the two-photon exclusive channels ..gamma gamma -->..M/sup +/M/sup -/ (M = ..pi..,K) at large momentum transfer. The calculation is carried out in the Feynman gauge. The dimensional-regularization method is used to control both ultraviolet and infrared divergences. The model meson distribution amplitude Phi/sub M/proportionaldelta(x-(1/2)) is utilized as a candidate form for the nonperturbative dynamical input. In order to reduce the effect of the particular choice of Phi/sub M/, similarity between ..gamma gamma -->..M/sup +/M/sup -/ and ..gamma../sup */..-->..M/sup +/M/sup -/ (timelike meson electromagnetic form factor) is employed. In the modified minimal-subtraction (MS-bar) scheme definition of ..cap alpha../sub s/, renormalized at W/sub ..gamma..//sub ..gamma../ (total center-of-mass energy of the ..gamma gamma.. system), and with the present estimates of ..lambda../sub M//sub S-bar/ (--150 MeV), it is found that next-to-leading-order corrections become sufficiently small (<25%) only for W/sub ..gamma..//sub ..gamma../>10 GeV, which is much larger than the highest W/sub ..gamma..//sub ..gamma../ for which experimental data exist.

• Research Organization: Newman Laboratory of Nuclear Studies, Cornell University, Ithaca, New York 14853
• OSTI ID: 6812554
• Journal Information: Phys. Rev. D; (United States), Journal Name: Phys. Rev. D; (United States) Vol. 35:1; ISSN PRVDA
• Country of Publication: United States
• Language: English

Related Subjects

645202* -- High Energy Physics-- Particle Interactions &amp; Properties-Theoretical-- Electromagnetic Interactions &amp; Properties
645400 -- High Energy Physics-- Field Theory
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
AMPLITUDES
ANNIHILATION
BASIC INTERACTIONS
BOSONS
DIAGRAMS
ELECTROMAGNETIC FORM FACTORS
ELECTROMAGNETIC INTERACTIONS
ELEMENTARY PARTICLES
EXCLUSIVE INTERACTIONS
FEYNMAN DIAGRAM
FIELD THEORIES
FORM FACTORS
FUNCTIONS
HADRONS
HELICITY
INFRARED DIVERGENCES
INTERACTIONS
KAONS
MESONS
MOMENTUM TRANSFER
PAIR PRODUCTION
PARTICLE INTERACTIONS
PARTICLE PROPERTIES
PERTURBATION THEORY
PHOTON-PHOTON INTERACTIONS
PIONS
POSTULATED PARTICLES
PSEUDOSCALAR MESONS
QUANTUM CHROMODYNAMICS
QUANTUM FIELD THEORY
QUARKS
RENORMALIZATION
SCATTERING AMPLITUDES
STRANGE MESONS
STRANGE PARTICLES
WAVE FUNCTIONS