In this short article we plan to provide the non-expert reader with some simple theoretical
tools, borrowed partly from dual theory [1] and partly from Quantum Chromodynamics [2 …

The theory and phenomenology of baryon exchange processes are critically reviewed. As
regards theory the main topics are the parity doublet problem and the patterns of exchange …

We compare and contrast several theoretical approaches which could account for a new
class of narrow mesons recently observed in the mass region 1.5–3 GeV/c 2, particularly …

In the previous paper we proposed a phenomenological mass formula based on the MIT
bag model. We used it to describe the spectrum of baryon resonances. Now it is applied to …

The cross section for 180 elastic scattering of antiprotons by protons between 406 and 922
MeV/c has been measured. A single-arm spectrometer detected recoil protons …

This Letter carries out a sensitive (∼ 5 events/nb) search for narrow pp states at the
Brookhaven National Laboratory multiparticle spectrometer. No evidence is found for such …

The results of a search for narrow pp states produced in the baryon-exchange reaction π+
p→ Δ f++ pp at 9.8 GeV/c are reported. This channel provides an enhanced sensitivity to …

The results of a search for narrow pp states produced backwards in the baryon exchange
reactions π− p→ Δ f 0 (1232) pp and π− p→ N f 0 (1520) pp at at 12 GeV/c and π+ p→ Δ …

The reactions pp→ π− X and pd→ pX earch for narrow baryonium states in the mass region
between 1.6 and 2.0 GeV/c 2. No such state has been observed. In the first reaction the …

An experimental investigation of the reaction γ p→ ppp at photon energies 4.7⩽ E γ⩽ 6.6
GeV is described. The main results are the measurement of the cross section as a function of …