Abstract
The scientific aim of our research is experimental confirmation of the existence of mesic-nucleus: a new exotic kind of nuclear matter consisting of nucleons and mesons. In this report we present the method of luminosity determination for experiment performed atWASA-at-COSY detector dedicated to search for 3He-η bound state. This method is based on analysis of quasi-free $pd \to ppn_{{\rm{spec}}} $ reaction.
Highlights
In 1986, Haider and Liu [1] postulated the hypothesis that the neutral mesons such as η or η can form bound states with atomic nuclei due to the strong interaction
Each of N0 simulated event was weighted by the differential cross section for the quasi-free pd → ppnspec reaction which is a function of the scattering angle θ∗ and the effective proton beam momentum ppbpeam
The events corresponding to the charged pions registered in the Central Detector (CD) were subtracted based on energy deposited in the electromagnetic calorimeter and thin plastic scintillator, while the background coming from elastic p − d scattering was subtracted applying the cut in polar angle θCD
Summary
In 1986, Haider and Liu [1] postulated the hypothesis that the neutral mesons such as η or η can form bound states with atomic nuclei due to the strong interaction. During a ramping process the luminosity could vary due to displacement of the beam at the target position correlated with the variation of the momentum and adiabatic shrinking of the beamsize [15] For this reason it is crucial to determine luminosity dependence on the excess energy for the normalization of the obtained excitation function for studied reactions and for interpretation of the results in view of the hypothesis of the 3He-η bound state production. Each of N0 simulated event was weighted by the differential cross section for the quasi-free pd → ppnspec reaction which is a function of the scattering angle θ∗ and the effective proton beam momentum ppbpeam.
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