Two-pion decay widths of excited charm mesons

Citation
Ta. Lahde et Do. Riska, Two-pion decay widths of excited charm mesons, NUCL PHYS A, 693(3-4), 2001, pp. 755-774
Citations number
19
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Physics
Journal title
NUCLEAR PHYSICS A
ISSN journal
0375-9474 → ACNP
Volume
693
Issue
3-4
Year of publication
2001
Pages
755 - 774
Database
ISI
SICI code
0375-9474(20011022)693:3-4<755:TDWOEC>2.0.ZU;2-O
Abstract
The widths for pi pi decay of the L = 1 charm mesons are calculated by desc ribing the pion coupling to light constituents quarks by the lowest-order c hiral interaction. The wavefunctions of the charm mesons are obtained as so lutions to the covariant Blankenbecler-Sugar equation. These solutions corr espond to an interaction Hamiltonian modeled as the sum of a linear scalar confining and a screened one-gluon exchange (OGE) interaction. This interac tion induces a two-quark contribution to the amplitude for two-pion decay, which is found to interfere destructively with the single-quark amplitude. For the currently known L = 1 D mesons, the total pi pi -decay widths are f ound to be similar to1 MeV for the D-1 (2420) and similar to3 MeV for the D -2* (2460) if the axial coupling of the constituent quark is taken to be g( A)(q) = 1. The as yet undiscovered spin-singlet D-1* state is predicted to have a larger width of 7-10 MeV for pi pi decay. (C) 2001 Elsevier Science B.V. All rights reserved.