Evidence ofN*(1535)resonance contribution in thepn→dϕ

Abstract

The N * (1535) resonance contributions to the pn → dφ reaction are evaluated in an effective Lagrangian model. The π−, η−, and ρ−meson exchange are considered. It is shown that the contributions from π− and ρ−meson exchange are dominant, while the contribution from η−meson exchange is negligibly small. Our theoretical results reproduce the experimental data of both total cross section and angular distribution well. This is another evidence that the N * (1535) resonance has large ss component leading to a large coupling to N φ, which may be the real origin of the OZI rule violation in the πN and pN reactions.

Nucleon resonances in πN → η′N and J/ψ → pp̄η′

“…We include the sub-threshold resonance S 11 (1535) because it may have big couplings to η ′ N , as found in pN → pN η ′ reaction [30]. In fact, the constitute of this resonance may have significant ss element [61,62], resulting in its big couplings to KΛ [23] and N φ [25,31,60]. However, the combination of several Sand P -wave resonances above η ′ N threshold could give reasonable description to the data of pN → pN η ′ [52][53][54].…”

“…In recent years, plenty of information on nucleon resonances [1] has been obtained by a wealth of phenomenological studies on numerous data of the πN , γN , eN reactions and pN collisions [23][24][25][26][27][28][29][30][31][32][33][34][35]. However, despite a great deal of theoretical and experimental efforts, our knowledge of nucleon resonances around 2.0 GeV is still scarce because of the presence of many resonances and opening channels in this energy region.…”

“…Unfortu- * Electronic address: caoxu@impcas.ac.cn † Electronic address: xiejujun@impcas.ac.cn nately, up to date we know little about the coupling of the η ′ -, ω-, and φ-mesons to nucleon resonances [50] and the interaction of these mesons with the nucleon [51]. In past decades, the production of these mesons in the γN and pN reactions have been widely investigated, mainly motivated by the increasing data measured by CLAS, CBELSA and COSY groups [24][25][26][27][28][29][30][31][52][53][54]. But the results are quite inconclusive for the moment.…”

Contribution of thet-channelN*(1535)exchange for theppShi1, Dai2, Zou3 2011Phys. Rev. DSelf Cite4090View full textAdd to dashboardCite

“…Also, as OZI-forbidden reactions can proceed via two-step hadronic loops in which each individual transition is OZI-allowed [11], Lu et al [12] On the other hand, recently, it has been suggested that the strong couplings of N Ã ð1535Þ to N, 0 N and KÃ may indicate a possible significant s" s component in the quark wave function of N Ã ð1535Þ and also a large coupling to N [14][15][16]. Xie et al [14] deduced the significant coupling of N Ã ð1535Þ to N as g 2 N Ã ð1535ÞN =4 ¼ 0:13.…”

The near threshold π- p →ηn reaction in an effective Lagrangian approach

“…This is the long standing inverse mass problem for the low-lying excited nucleon states. Furthermore, it is well known that N * (1535) resonance couples strongly to the final states with strangeness, such as, ηN channel [1,[4][5][6], KΛ channel [7][8][9], η ′ N [10,11], and φN channel [12][13][14], which implies a considerable amount of ss component in the N * (1535) wave function [2,15,16].…”