Role of the Λ(1600) in the K^-p→Λπ^0π^0 reaction  

作　　者：He Zhou Ju-Jun Xie 

机构地区：[1]Institute of Modern Physics,Chinese Academy of Sciences,Lanzhou 730000,China [2]School of Nuclear Science and Technology,University of Chinese Academy of Sciences,Bejing 101408,China [3]School of Physics and Microelectronics,Zhengzhou University,Zhengzhou,Henan 450001,China

出　　处：《Communications in Theoretical Physics》2020年第4期64-70,共7页理论物理通讯（英文版）

基　　金：partly supported by the National Natural Science Foundation of China under Grant Nos.11735003,1191101015 and 11475227;the Youth Innovation Promotion Association CAS(No.2016367).

摘　　要：Role of theΛ(1600)is studied in the K^-p→Λπ^0π^0 reaction by using the effective Lagrangian approach near the threshold.We perform a calculation for the total and differential cross sections by considering the contributions from theΛ(1600)andΛ(1670)intermediate resonances decaying intoπ^0∑^*0(1385)with∑^*0(1385)decaying intoπ^0Λ.Additionally,the non-resonance process from u-channel nucleon pole is also taken into account.With our model parameters,the current experimental data on the total cross sections of the K^-p→Λπ^0π^0 reaction can be well reproduced.It is shown that we really need the contribution from the A(1600)with spin-parity J^P=1/2^+,and that these measurements can be used to determine some of the properties of theΛ(1600)resonance.Furthermore,we also plot theπ0Λinvariant mass distributions which could be tested by the future experimental measurements.

关 键 词：KN SCATTERING effective LAGRANGIAN approach HYPERON RESONANCE 

分 类 号：O572.34[理学—粒子物理与原子核物理] O321[理学—物理]