Isospin-violating strong decays of scalar single-heavy tetraquarks
| Parent link: | Physical Review D: particles, fields, gravitation, and cosmology.— , 1970- Vol. 94, iss. 9.— 2016.— [094012, 8 p.] |
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| 団体著者: | |
| その他の著者: | , , , |
| 要約: | 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 |
| 出版事項: |
2016
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| 主題: | |
| オンライン･アクセス: | https://doi.org/10.1103/PhysRevD.94.094012 |
| フォーマット: | 電子媒体 図書の章 |
| KOHA link: | https://koha.lib.tpu.ru/cgi-bin/koha/opac-detail.pl?biblionumber=652289 |
| 要約: | 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 |
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| DOI: | 10.1103/PhysRevD.94.094012 |