Eur. Phys. J. A (2009) 41: 361-368
https://doi.org/10.1140/epja/i2009-10834-2

Regular Article - Theoretical Physics

Searching for signatures around 1920 MeV of a N^* state of three hadron nature

¹ Departamento de Física Teórica and IFIC, Centro Mixto Universidad de Valencia-CSIC, Institutos de Investigación de Paterna, Aptdo. 22085, 46071, Valencia, Spain
² Centro de Física Teórica, Departamento de Física, Universidade de Coimbra, P-3004-516, Coimbra, Portugal
³ Helmholtz-Institut für Strahlen-und Kernphysik and Bethe Center for Theoretical Physics, Universität Bonn, D-53115, Bonn, Germany
⁴ Institut für Kernphysik, Institute for Advanced Simulations and Jülich Center for Hadron Physics, Forschungszentrum Jülich, D-52425, Jülich, Germany

^* e-mail: amartine@ific.uv.es

Received: 24 February 2009
Revised: 24 April 2009
Accepted: 16 June 2009
Published online: 21 July 2009

Abstract

We provide a series of arguments which support the idea that the peak seen in the p K ⁺ reaction around 1920MeV should correspond to the recently predicted state of J ^P = 1/2⁺ as a bound state of K N with a mixture of a ₀(980)N and f ₀(980)N components. At the same time we propose polarization experiments in that reaction as a further test of the prediction, as well as a study of the total cross-section for p K ⁺ K ^- p at energies close to threshold and of dσ/dM _inv for invariant masses close to the two-kaon threshold.