What can we learn from the decay of NX(1625) in the molecule picture?

Abstract

Considering two molecular state assumptions, i.e. S-wave Λ − K − and S-wave Σ0 − K − molecular states, we study the possible decays of NX (1625) that include NX (1625 1625), and the branching ratios of the rest decay modes are tiny; (2) if NX ( 1625) is Σ0 − K − molecular state, the branching ratio of NX (1625) → K − Λ is one or two order smaller than that of NX (1625) → π 0 p, η p, π − n. Thus the search for NX (1625) → π 0 p, η p, π − n will be helpful to shed light on the nature of NX (1625).

Towards the decays of $\bar{N}_X(1625)$ in the molecular picture

“…The branching ratios respectively corresponding to J/ψ → pπ − n and J/ψ → pη p are 2.4 × 10 −3 and 2.1 × 10 −3 [20,21] . Although these experimental values are comparable with our numerical result of the corresponding channel, the former experiments did not find the structure consistent with NX (1625), which seems to show that the evidence against S-wave Σ0 − K − molecular picture is gradually accumulating [7] . As indicated in Ref.…”

The hidden-charm pentaquark and tetraquark states

“…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].…”

The hidden-charm pentaquark and tetraquark states

“…Since 2003, many enhancement structures near the two-hadron thresholds have been reported as shown in Table 10. 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].…”