Published 1999 | Version v1
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Pion distribution amplitude within the instanton model

Creators

  • 1. Bogolyubov Laboratory of Theoretical Physics, Joint Institute for Nuclear Research, Dubna (Russian Federation)
  • 2. Instituto de Fisica Teorica, UNESP, Sao Paulo, SP (Brazil)

Description

The leading-twist pion distribution amplitude is obtained at a low normalization scale of an order of the inverse average size of an instanton ρc. The pion dynamics, consistent with gauge invariance and low energy theorems, is considered within the instanton vacuum model. The results are QCD evolved to higher momentum-transfer values, and are in agreement with recent data from CLEO on pion transition form factor. We also show that previous calculations violate the axial Ward-Takahashi identity

Availability note (English)

Available from INIS in electronic form

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Additional details

Publishing Information

Imprint Pagination
18 p.
Report number
JINR-E--2-99-339

INIS

Country of Publication
Joint Institute for Nuclear Research (JINR)
Country of Input or Organization
Joint Institute for Nuclear Research (JINR)
INIS RN
31018509
Subject category
S72: PHYSICS OF ELEMENTARY PARTICLES AND FIELDS;
Descriptors DEI
AXIAL-VECTOR CURRENTS; COUPLING CONSTANTS; FORM FACTORS; FOUR MOMENTUM TRANSFER; GAUGE INVARIANCE; INSTANTONS; LIGHT CONE; PIONS; PROPAGATOR; QUARK MODEL; SCATTERING AMPLITUDES; SCHWINGER FUNCTIONAL EQUATIONS; VACUUM STATES; VERTEX FUNCTIONS; WARD IDENTITY
Descriptors DEC
ALGEBRAIC CURRENTS; AMPLITUDES; BOSONS; COMPOSITE MODELS; CURRENTS; DIFFERENTIAL EQUATIONS; ELEMENTARY PARTICLES; EQUATIONS; FUNCTIONS; HADRONS; INVARIANCE PRINCIPLES; MATHEMATICAL MODELS; MESONS; MOMENTUM TRANSFER; PARTICLE MODELS; PARTICLE PROPERTIES; PSEUDOSCALAR MESONS; QUASI PARTICLES; SPACE-TIME

Optional Information

Notes
25 refs., 2 figs. Submitted to Yadernaya Fizika