Published April 2017 | Version v1
Journal article Metadata-only

γγ → M+M-(M = π, K) processes with twist-3 corrections in QCD

Creators

  • 1. Chinese Academy of Sciences, State Key Laboratory of Theoretical Physics, Institute of Theoretical Physics, Beijing (China)
  • 2. Southwest University, School of Physical Science and Technology, Chongqing (China)

Description

We study the γγ → M+M-(M = π, K) processes with the contributions from the two-particle twist-2 and twist-3 distribution amplitudes of pion and kaon mesons on BHL prescription in the standard hard-scattering approach. The results show that the contributions from twist-3 parts are actually not power suppressed compared with the leading-twist contributions in the low energy region. The cross sections with twist-3 corrections agree well with the experimental data in the two-photon center-of-mass energy W > 2.8 GeV and we also predict the cross section ratio σ0(K+K-)/σ0(π+π-), which is compatible with the experimental data from TPC and Belle. (orig.)

Availability note (English)

Available from: http://dx.doi.org/10.1140/epjc/s10052-017-4764-2

Additional details

Identifiers

DOI
10.1140/epjc/s10052-017-4764-2;

Publishing Information

Journal Title
European Physical Journal. C, Particles and Fields (Online)
Journal Volume
77
Journal Issue
4
Journal Page Range
p. 1-12
ISSN
1434-6052

INIS

Country of Publication
Germany
Country of Input or Organization
Germany
INIS RN
48053351
Subject category
S72: PHYSICS OF ELEMENTARY PARTICLES AND FIELDS;
Resource subtype / Literary indicator
Numerical Data
Descriptors DEI
ANGULAR DISTRIBUTION; BRANCHING RATIO; CORRECTIONS; ENERGY DEPENDENCE; EXCITATION FUNCTIONS; GEV RANGE 01-10; GEV RANGE 10-100; INTEGRAL CROSS SECTIONS; KAONS MINUS; KAONS PLUS; MATRIX ELEMENTS; PAIR PRODUCTION; PHOTON-PHOTON INTERACTIONS; PHOTOPRODUCTION; PIONS MINUS; PIONS PLUS; QUANTUM CHROMODYNAMICS; SCATTERING AMPLITUDES; SPIN ORIENTATION; THEORETICAL DATA
Descriptors DEC
AMPLITUDES; BOSONS; CROSS SECTIONS; DATA; DIFFERENTIAL CROSS SECTIONS; DIMENSIONLESS NUMBERS; DISTRIBUTION; ELECTROMAGNETIC INTERACTIONS; ELEMENTARY PARTICLES; ENERGY RANGE; FIELD THEORIES; FUNCTIONS; FUNDAMENTAL INTERACTIONS; GEV RANGE; HADRONS; INFORMATION; INTERACTIONS; KAONS; MESONS; NUMERICAL DATA; ORIENTATION; PARTICLE INTERACTIONS; PARTICLE PRODUCTION; PIONS; PSEUDOSCALAR MESONS; QUANTUM FIELD THEORY; STRANGE MESONS; STRANGE PARTICLES