Studying meson baryon systems with strangeness +1

37th Brazilian Meeting on Nuclear Physics

Khemchandani, K.P.^1,2 ; Torres, A Martinez^1 ; Navarra, F.S.^1 ; Nielsen, M.^1 ; Tolos, L.^3,4

Instituto de Física, Universidade de São Paulo, C.P 66318, São Paulo, SP

05314-970, Brazil^1

Faculdade de Tecnologia, Universidade Do Estado Do Rio de Janeiro, Rod. Presidente Dutra Km 298, Polo Industrial, Resende, RJ

27537-000, Brazil^2

Instituto de Ciencias Del Espacio (IEEC/CSIC), Campus Universitat Autònoma de Barcelona, Carrer de Can Magrans, s/n, Cerdanyola del Vallès

08193, Spain^3

Frankfurt Institute for Advanced Studies (FIAS), Frankfurt am Main

60438, Germany^4

关键词: Contact interaction;    Coupled interaction;    Isospin;    Lagrangian;    S-waves;    Two channel;    U-channels;    Vector meson;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/630/1/012054/pdf
DOI  :  10.1088/1742-6596/630/1/012054

来源: IOP

【 摘 要 】

We discuss the results of our recent study of the s-wave KN-K∗N coupled interaction. The K∗N amplitude is obtained by calculating t- and u- channel diagrams and a contact interaction. For the KN amplitude we calculate the Weinberg-Tomozawa term obtained from the lowest order chiral Lagrangian. The KNK∗N amplitudes are calculated by replacing the photon by a vector meson in the standard Kroll-Ruderman term. The subtraction constants required to calculate the loops are fixed by demanding the KN amplitudes to fit the data available on the isospin 0 and 1 s-wave phase shifts. We find that the coupling between the two channels plays an important in the isospin 0 configuration. We obtain updated amplitudes and cross sections for the KN and K∗N systems, which can be used to understand some recent findings of K, K∗ production in p-p and p-A collisions studied by the Hades collaboration. We also look for resonances in these systems but find none.