On tetraquark meson states
نویسنده
چکیده
It is suggested that the narrow meson state seen in the the SELEX experiment is a (cs̄ss̄) tetraquark state. Characteristics of other possible tetraquarks formed out of c and s quarks and antiquarks are considered. SELEX experiment has reported [1] a puzzling narrow meson state at a mass of 2632.6± 1.6 MeV/c which decays preferentially to D s (cs̄) + η(548) rather than to D(cd̄)+K or D(cū)+K. In this note, we suggest [2] that this state is a tetra-quark meson containing a c quark and three s quarks and antiquarks. We denote this state as D(cs̄ss̄), its quark content is made explicit for clarity. The presence of the ss̄ pair is responsible for the observed decay pattern. Note that,in terms of the the SU(3) flavor states, η1 and η8 ss̄ = 1 √ 3 η1 − 2 √ 6 η8, (1)
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