Bound states of the heavy flavor vector mesons andY(4008)andZ1+(4050)

Abstract

systems are studied dynamically in the one boson exchange model, where π, η, σ, ρ and ω exchanges are taken into account. Ten allowed states with low spin parity are considered. We suggest that the 1 −− , 2 ++ , 0 ++ and 0 −+ B * B * molecules should exist, and the D * D * bound states with the same quantum numbers very likely exist as well. However, the CP exotic (1 −+ , 2 +− ) B * B * and D * D * states may not be bound by the one boson exchange potential. We find that the I = 0 configuration is more deeply bound than the I = 1 configuration, hence

An overview of XYZ new particles

“…Ding studied the D * D * interaction and found that the D * D * molecular state with J PC = 1 −− can exist. However, if this D * D * molecular state corresponds to Y(4008), we must explain why Y(4008) is very broad [144]. We also notice an interesting phenomenon in Ref.…”

Charged exotic charmonium states

“…[56], a strong attraction in the D * D * with J P = 0 + was found, while in Ref. [57] the interpretation of Z + 1 (4050) as a D * D * molecule was not favored. In any case, it is very difficult to understand a bound molecular state which mass is above the D * D * threshold.…”

The hidden-charm pentaquark and tetraquark states

“…[237], Ding studied the D * D * system dynamically in the one boson exchange model, and found the interpretation of the Y(4008) as a D * D * molecule is not favored by its huge width, although it is close to the D * D * threshold. However, in Ref.…”

“…The proximity of their masses to the thresholds inspired molecular explanations of these structures [196,215,216,202,217,218,219,220,221,222,223,224,225,203,226,200,227,228,229,230,231,232,233,234,235,236,237,238,239]. With the refinement of the meson exchange model, many subtle aspects of this framework were investigated, such as the S-D wave mixing effect [185,197], coupled-channel effect [240,241,242], and recoil correction [243,244].…”