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Title: Pion pair production in e{sup +}e{sup -} annihilation

Abstract

We present an analysis of the process e{sup +}e{sup -}{yields}{gamma}* or Z*{yields}{pi}{pi}{gamma}, in the kinematical region where {radical}(s), the c.m. energy of the e{sup +}e{sup -} pair, is large but much below the Z-pole. The subprocess {gamma}* or Z*{yields}{pi}{pi}{gamma} can be described by the convolution of the hard scattering coefficient {gamma}* or Z*{yields}qq{gamma} and the general distribution amplitude of two pions qq{yields}{pi}{pi}. In the case of neutral pion, the production through {gamma}* is the dominant process, which can therefore be used to access the generalized distribution amplitudes (GDAs) of the pion, especially their C-even parts. The {gamma}Z interference term provides an alternative approach to extract the weak mixing angle sin{theta}{sub W} through measuring the helicity asymmetry in the process e{sup +}e{sup -}{yields}{pi}{sup 0}{pi}{sup 0}{gamma}. In the case of charged pion pair production, the Bremsstrahlung process dominates and its interference with e{sup +}e{sup -}{yields}{gamma}*{yields}{pi}{sup +}{pi}{sup -}{gamma} can be applied to study the process {gamma}*{yields}{pi}{pi}{gamma} at the amplitude level.

Authors:
;  [1]
  1. Departamento de Fisica, Universidad Tecnica Federico Santa Maria, Casilla 110-V, Valparaiso (Chile)
Publication Date:
OSTI Identifier:
20782996
Resource Type:
Journal Article
Resource Relation:
Journal Name: Physical Review. D, Particles Fields; Journal Volume: 73; Journal Issue: 9; Other Information: DOI: 10.1103/PhysRevD.73.094021; (c) 2006 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; AMPLITUDES; ANNIHILATION; ASYMMETRY; BREMSSTRAHLUNG; DISTRIBUTION; ELECTRON-POSITRON INTERACTIONS; HELICITY; INCLUSIVE INTERACTIONS; INTERFERENCE; PAIR PRODUCTION; PARTICLE DECAY; PHOTONS; PHOTOPRODUCTION; PIONS MINUS; PIONS NEUTRAL; PIONS PLUS; QUARK-ANTIQUARK INTERACTIONS; SCATTERING; WEINBERG ANGLE; Z NEUTRAL BOSONS

Citation Formats

Lu Zhun, and Schmidt, Ivan. Pion pair production in e{sup +}e{sup -} annihilation. United States: N. p., 2006. Web. doi:10.1103/PHYSREVD.73.094021.
Lu Zhun, & Schmidt, Ivan. Pion pair production in e{sup +}e{sup -} annihilation. United States. doi:10.1103/PHYSREVD.73.094021.
Lu Zhun, and Schmidt, Ivan. Mon . "Pion pair production in e{sup +}e{sup -} annihilation". United States. doi:10.1103/PHYSREVD.73.094021.
@article{osti_20782996,
title = {Pion pair production in e{sup +}e{sup -} annihilation},
author = {Lu Zhun and Schmidt, Ivan},
abstractNote = {We present an analysis of the process e{sup +}e{sup -}{yields}{gamma}* or Z*{yields}{pi}{pi}{gamma}, in the kinematical region where {radical}(s), the c.m. energy of the e{sup +}e{sup -} pair, is large but much below the Z-pole. The subprocess {gamma}* or Z*{yields}{pi}{pi}{gamma} can be described by the convolution of the hard scattering coefficient {gamma}* or Z*{yields}qq{gamma} and the general distribution amplitude of two pions qq{yields}{pi}{pi}. In the case of neutral pion, the production through {gamma}* is the dominant process, which can therefore be used to access the generalized distribution amplitudes (GDAs) of the pion, especially their C-even parts. The {gamma}Z interference term provides an alternative approach to extract the weak mixing angle sin{theta}{sub W} through measuring the helicity asymmetry in the process e{sup +}e{sup -}{yields}{pi}{sup 0}{pi}{sup 0}{gamma}. In the case of charged pion pair production, the Bremsstrahlung process dominates and its interference with e{sup +}e{sup -}{yields}{gamma}*{yields}{pi}{sup +}{pi}{sup -}{gamma} can be applied to study the process {gamma}*{yields}{pi}{pi}{gamma} at the amplitude level.},
doi = {10.1103/PHYSREVD.73.094021},
journal = {Physical Review. D, Particles Fields},
number = 9,
volume = 73,
place = {United States},
year = {Mon May 01 00:00:00 EDT 2006},
month = {Mon May 01 00:00:00 EDT 2006}
}