https://doi.org/10.1140/epja/i2014-14109-7
Regular Article - Experimental Physics
On determining the cross section of the supposed pentaquark 
in the reaction pp 
pK0
1
Institut für Kern- und Teilchenphysik, Technische Universität Dresden, D-01062, Dresden, Germany
2
Centre for Particle Physics, Department of Physics, University of Alberta, AB T6G 2E1, Edmonton, Canada
* e-mail: m.schulte-wissermann@physik.tu-dresden.de
Received:
25
February
2014
Revised:
18
May
2014
Accepted:
10
June
2014
Published online:
9
July
2014
This paper addresses the problem of how to extract an upper limit on the cross section for 
production via the reaction 
, where the is assumed to decay into the 
subsystem. Recent data of the COSY-TOF Collaboration, namely the angular distribution of protons in the 
helicity frame and the invariant mass spectrum of the system, were scrutinised with regard to a resonance by applying the profile likelihood method. It is found that the former distribution is best suited for setting an upper limit on the production, which varies between 90nb for an assumed mass of 1500MeV/c^2 and 56nb for 1540MeV/c^2.
© SIF, Springer-Verlag Berlin Heidelberg, 2014
