Apart from the charmful decay channels of Y (4260), the charmless decay channels of Y (4260) also provide us a good platform to study the nature and the decay mechanism of Y (4260). In this paper, we propose to probe the structure of Y (4260) through the charmless decays Y (4260) → V P via intermediate D1D+c.c. meson loops, where V and P stand for light vector and pseudoscalar mesons, respectively. Under the molecule ansatz of Y (4260), the predicted total branching ratio BRV P for all Y (4260) → V P processes are about (0.34 +0.32 −0.23 )% to (0.75 +0.72 −0.52 )% with the cutoff parameter α = 2 ∼ 3. Numerical results show that the intermediate D1D +c.c. meson loops may be a possible transition mechanism in the Y (4260) → V P decays. These predicted branching ratios are the same order to that of Y (4260) → Z + c (3900)π − , which may be an evidence of D1D molecule and can be examined by the forthcoming BESIII data in the near future.

Here we employ the extended chiral constituent quark model to investigate the five-quark components in the N*(1535) resonance. The axial charge of N*(1535) and the electromagnetic transition γ*N → N*(1535) are also analyzed. The results show that there may be sizable strangeness component in N*(1535).

The helicity amplitude A1/2p for the electromagnetic transition γ*N → N* (1535) is investigated. It is found that a new mechanism γ* → qq̄ plays an important role in order to improve the description of this transition. On one hand, the A1/2p is decreased to fall in the data range at the photon point Q2 = 0, while on the other hand, the new mechanism makes the function A1/2p(Q2) to decrease more slowly vs increasing Q2, as required by the data.