In 2017, the LHCb Collaboration at CERN discovered the doubly charmed baryon\Xi _{cc}^{++}in the\Lambda _{c}^{+}K^{-}\pi ^{{+}}\pi ^{+}mass spectrum [5] and reconfirms it in the decay channel of\Xi _{c}^{+}\pi ^{+}[6], with the measured mass3621.55\pm 0.23\pm 0.3...
i=Q Q ,q (A5) The boundary condition of string at ends linked to heavy quark gives a ω = (mbareQ Q )vQ Q 1 − v2Q Q = MQQvQQ . 1 − v2Q Q (A6) As the diquark Q Q is very heavy and moves nonrela- tivistically in hadrons, vQQ is small in the limit of heavy ...