Isospin-violating strong decays of scalar single-heavy tetraquarks

Isospin-violating strong decays of scalar single-heavy tetraquarks

Bibliographic Details
Parent link:Physical Review D: particles, fields, gravitation, and cosmology.— , 1970-
Vol. 94, iss. 9.— 2016.— [094012, 8 p.]
Corporate Author: Национальный исследовательский Томский политехнический университет Физико-технический институт Кафедра высшей математики и математической физики
Other Authors: Gutsche Th. Thomas, Ivanov M. A. Mikhail Alekseevich, Korner J. G. Jurgen, Lyubovitskiy (Lyubovitskij) V. E. Valery Efimovich
Summary:Title screen
We present a study of the isospin-violating one-pion strong decays of single heavy tetraquarks XQ=X(sqq¯Q¯), Q=c, b, and q=u, d with spin-parity JP=0+. We assume that the tetraquarks have the configuration of a color diquark and an antidiquark. Three mechanisms of isospin violation can contribute to the decay rate: (1) mixing of the X(suu¯Q¯) and X(sdd¯Q¯) tetraquark currents, (2) an explicit md−mu quark mass difference in the quark diagrams describing the corresponding decay transitions, and (3) π0−η mixing in the final state. Our main results are as follows: (1) It is quite likely that the investigated tetraquark states are isosinglet states with a small admixture of an isotriplet component; (2) The first isospin-breaking mechanism affects the decay rather more significantly than the others; (3) Our calculations contain a size parameter ΛXQ, characterizing the distribution of the quarks in the tetraquark state XQ. Absolute decay rates depend very much on the choice of ΛXQ, varied from 1 to 2 GeV, reflecting the compactness of the multiquark system.
Режим доступа: по договору с организацией-держателем ресурса
Published: 2016
Subjects:
электронный ресурс
труды учёных ТПУ
изоспин
нарушение
распады
Online Access:https://doi.org/10.1103/PhysRevD.94.094012
Format: Electronic Book Chapter
KOHA link:https://koha.lib.tpu.ru/cgi-bin/koha/opac-detail.pl?biblionumber=652289

Similar Items

Similar Items