A method to disentangle single- and multi-meson production in missing mass spectra from quasi-free pn --> pn X reactions

Abstract

The separation of contributions from multi- and single-meson production in the missing mass spectrum of the quasi-free pn --> pnX reaction constitutes a~challenging task when the reaction is studied close to threshold. This is especially true if the resolution of the mass determination is comparable with the excess energy and if the investigated signal appears close to the kinematical limit. In this article we outline a method which permits the extraction of the signal originating from the creation of a single meson without the necessity of conducting model-dependent simulations. For the pd --> pnXp(spectator) reactions, the method allows one to combine events corresponding to multi-meson production at various excess energies with respect to the pn --> pn meson process, and hence leads to an increase of the statistics needed for the determination of the shape of the multi-meson background. As an example of the application of the method, we demonstrate that the evaluation of the data from the pd --> pnXp(sp) process according to the described technique enables one to extract a signal of the pn --> pn eta reaction whose shape is consistent with expectations, supporting the correctness and usefulness of the method introduced.

14 pages, 10 figures

References in corpus (10)

• Meson production in nucleon--nucleon collisions close to the threshold
• Close-to-threshold Meson Production in Hadronic Interactions
• Experimental study of pp eta dynamics in the pp --> ppeta reaction
• Near-threshold production of omega mesons in the pn -> d omega reaction
• Drift chamber with a c-shaped frame
• Spectator detection for the measurement of proton neutron interactions at ANKE
• Upper limit for the cross section of the overlapping scalar resonances f0(980) and a0(980) produced in proton-proton collisions in the range of the reaction threshold
• Search for Bremsstrahlung radiation in quasi-free n p --> n p gamma reactions
• Production of eta and eta-prime mesons via the quasi-free proton-neutron interaction
• Isospin dependence of the eta' meson production in nucleon--nucleon collisions

Cited by in corpus (14)

• Measurement of the dp -->3He eta reaction near threshold
• Etaprime and Eta Mesons with Connection to Anomalous Glue
• Threshold hyperon production in proton-proton collisions at COSY-11
• Mechanism of the close-to-threshold production of the eta meson
• Determination of the total width of the eta' meson
• Near threshold production of the eta meson via the quasi-free pn --> pn eta reaction
• Measurement of the invariant mass distributions for the pp -> ppeta' reaction at excess energy of Q = 16.4 MeV
• Few-body aspects of the near threshold pseudoscalar meson production
• Study of the eta meson production with the polarised proton beam
• Eta and eta' mesons production at COSY-11
• Upper limit of the total cross section for the pn --> pn eta' reaction
• Reaction pp -> pp πππas a background for hadronic decays of the eta-prime meson
• Studies of properties of the eta' meson at the COSY-11 facility
• Isospin dependence of the eta prime meson production in nucleon-nucleon collisions