ELECTROMAGNETIC FORM-FACTOR OF D-ASTERISK-]D TRANSITION IN THE TIME-LIKE REGION

ALIEV T., ILTAN E., PAK N., REKALO M.

ZEITSCHRIFT FUR PHYSIK C-PARTICLES AND FIELDS, vol.64, no.4, pp.683-688, 1994 (SCI-Expanded) identifier identifier

  • Publication Type: Article / Article
  • Volume: 64 Issue: 4
  • Publication Date: 1994
  • Doi Number: 10.1007/bf01957777
  • Journal Name: ZEITSCHRIFT FUR PHYSIK C-PARTICLES AND FIELDS
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Page Numbers: pp.683-688
  • Middle East Technical University Affiliated: Yes

Abstract

The internal conversion process D* --> De(+) e(-), and D*($) over bar D-pair production in e(+) e(-) -collisions, e(+) e(-) --> D*($) over bar D, which are described by the same electromagnetic form factor with time-like momentum transfer, have been analyzed. After carrying out a general analysis of the kinematical aspects of the one-photon mechanism has been performed and the predictions of the vector-dominance model for the D* --> D transition form factor are discussed. It is shown that use of the asymptotic behaviour of the form factors of D*(+,0) --> D(+,0)gamma*-transitions and the theoretical values of constants of D*(+,0) --> D(+,0)gamma radiative decay enables one to determine part of the unknown parameters of these form factors. The coefficient of the internal conversion for D* --> De(+) e(-) is calculated and is shown to be model independent.