https://doi.org/10.1140/epja/i2015-15130-0
Regular Article - Theoretical Physics
Role of Λ(1670) in the γp → K+ ηΛ reaction near threshold
1
Department of Physics, Hunan normal University, Changsha, 410081, Hunan, China
2
Department of Physics, Zhengzhou University, Zhengzhou, 450001, Henan, China
3
Institute of Modern Physics, Chinese Academy of Sciences, 730000, Lanzhou, China
4
Research Center for Hadron and CSR Physics, Institute of Modern Physics of CAS and Lanzhou University, 730000, Lanzhou, China
5
State Key Laboratory of Theoretical Physics, Institute of Theoretical Physics, Chinese Academy of Sciences, 100190, Beijing, China
* e-mail: xiejujun@impcas.ac.cn
Received:
5
May
2015
Revised:
6
September
2015
Accepted:
8
September
2015
Published online:
20
October
2015
The role of the Λ(1670) resonance in the γp → K + ηΛ reaction near threshold is studied within an effective Lagrangian approach. We perform a calculation for the total and differential cross section of the γp → K + ηΛ reaction by including the contributions from the Λ(1670) intermediate state decaying into ηΛ dominated by K − and K *− mesons exchanges, the nucleon pole and N*(1535) resonance decaying into K + Λ dominated by exchanges of ω and K − mesons. Besides, the non-resonance process and contact terms to keep the total scattering amplitude gauge invariant are also considered. With our model parameters, the total cross section of this reaction is of the order of 1 nanobarn at photon beam energy E γ ∼ 2.5 GeV. It is expected that our model predictions could be tested by future experiments.
© SIF, Springer-Verlag Berlin Heidelberg, 2015
