Tetraquark
Mostrando 1-3 de 3 artigos, teses e dissertações.
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1. Study of the structure of new mesons / Estudo da estrutura dos novos mésons
We use QCD sum rules to test the nature of the recently observed mesons Y (4260), Y (4360) and Y (4660), assumed to be exotic four-quark (c¯cq¯q) or (c¯cs¯s) states with JPC = 1. We work at leading order in s, consider the contributions of higher dimension condensates and keep terms which are linear in the strange quark mass ms. We find for the (c¯cs¯s
Publicado em: 2009
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2. Investigating the tetraquark structure of the new mesons
Using the QCD sum rule approach we investigate the vertex associated with the decay D0(0+)-> D+pi-, where the scalar meson D0(0+) is considered as a four-quark state $(cd)(\bar{u}\bar{d})$. Although our results for the mass and partial decay width are smaller than the mass and the total decay width of the broad scalar meson D0*0(2308) reported by BELLE Colla
Brazilian Journal of Physics. Publicado em: 2007-03
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3. Exotic Hadrons in a QCD Sum Rules calculation / "Partículas exóticas em regras de soma da QCD"
In this work the QCD Sum Rules have been used to obtain masses and coupling or decay constants of the theta+(1540) and cascade--(1862) pentaquarks, the DsJ+(2317), D0(2308) and D0(2405) charmed scalar mesons and the X(3872) axial meson. The mesons have been treated as 4-quark exotic states (tetraquarks). Two sum rules methods have been used with special atte
Publicado em: 2006