Abstract
We present a study of the isospin-violating one-pion strong decays of single heavy tetraquarks XQ=X(sqqQ), 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(suūQ) and X(sddQ) 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.
| Original language | English |
|---|---|
| Article number | 094012 |
| Journal | Physical Review D |
| Volume | 94 |
| Issue number | 9 |
| DOIs | |
| Publication status | Published - 2016 |
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ASJC Scopus subject areas
- Physics and Astronomy (miscellaneous)
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Isospin-violating strong decays of scalar single-heavy tetraquarks. / Gutsche, Thomas; Ivanov, Mikhail A.; Körner, Jürgen G.; Lyubovitskij, Valery E.
In: Physical Review D, Vol. 94, No. 9, 094012, 2016.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Isospin-violating strong decays of scalar single-heavy tetraquarks
AU - Gutsche, Thomas
AU - Ivanov, Mikhail A.
AU - Körner, Jürgen G.
AU - Lyubovitskij, Valery E.
PY - 2016
Y1 - 2016
N2 - We present a study of the isospin-violating one-pion strong decays of single heavy tetraquarks XQ=X(sqqQ), 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(suūQ) and X(sddQ) 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.
AB - We present a study of the isospin-violating one-pion strong decays of single heavy tetraquarks XQ=X(sqqQ), 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(suūQ) and X(sddQ) 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.
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U2 - 10.1103/PhysRevD.94.094012
DO - 10.1103/PhysRevD.94.094012
M3 - Article
VL - 94
JO - Physical review D: Particles and fields
JF - Physical review D: Particles and fields
SN - 1550-7998
IS - 9
M1 - 094012
ER -