The scalar exotic resonances X(3915), X(3960), X(4140)

Bottomoniumlike tetraquarks in a chiral quark model

“…The importance of coupling D * D * and D * s D * s degree of freedom is highlighted within a one boson-exchange model approach [89]. Moreover, a ccss compact tetraquark structure is identified as the X(3960) state when using other phenomenological quark models [90,91].…”