Time delayed K+ N reactions and exotic baryon resonances

Abstract

Evidences and hints, both from the theoretical and experimental side, of exotic baryon resonances with B=S, have been with us for the last thirty years. The poor status of the general acceptance of these Z* resonances is partly due to the prejudice against penta-quark baryons and partly due to the opinion that a proof of the existence of exotic states must be rigorous. This can refer to the quality and amount of data gathered, and also to the analytical methods applied in the study of these resonances. It seems then mandatory that all possibilities and aspects be exploited. We do that by analyzing the time delay in K+ N scattering, encountering clear signals of the exotic Z* resonances close to the pole values found in partial wave analyses.

13 pages LaTex, 3 figures, references added in Note after publication

References in corpus (16)

• Exotic Anti-Decuplet of Baryons: Prediction from Chiral Solitons
• Chiral unitary approach to S-wave meson baryon scattering in the strangeness S=0 sector
• Evidence for Exotic Meson Production in the Reaction ${\pi }^{-}p\to \eta {\pi }^{-}p$ at 18 GeV/c
• Quantum mechanical time-delay matrix in chaotic scattering
• On the spin, parity and nature of the $\Xi (1620)$ resonance
• Radial excitations of low--lying baryons and the $Z^{+}$ penta--quark
• Delays Associated with Elementary Processes in Nuclear Reaction Simulations
• Parametric Correlations of Scattering Phase Shifts and Fluctuations of Delay Times in Few-Channel Chaotic Scattering
• On Gauge Invariance of Breit-Wigner Propagators
• On the flow of kaons produced in relativistic heavy ion collisions
• J^PC Exotic Mesons from the Bethe-Salpeter Equation
• Life time of resonances in transport simulations
• On the search for a narrow penta-quark Z${}^{+}$ baryon in NN interactions
• On the imaginary parts and infrared divergences of two-loop vector boson self-energies in thermal QCD
• On the Simulation of Extended TDHF Theory
• Radial Excitations of low-lying Baryons and the Structure of the Z^+ Penta-QuarK

Cited by in corpus (22)

• Heavy Hadrons in Nuclear Matter
• Phenomenology of the Pentaquark Antidecuplet
• Z^* Resonances: Phenomenology and Models
• Extraction of Resonances from Meson-Nucleon Reactions
• Photoproduction of Theta baryon from the neutron
• Positive Parity Pentaquarks Pragmatically Predicted
• Hidden evidence of non-exponential nuclear decay
• Quantum reflection and dwell times of metastable states
• A Naturally Narrow Positive Parity Theta^+
• Time Delay Plots of Unflavoured Baryons
• Collision times in pi-pi and pi-K scattering and spectroscopy of meson resonances
• Analysis of averaged multichannel delay times
• History of exotic Meson (4-quark) and Baryon (5-quark) States
• Small eta-N scattering lengths favour eta-d and eta-alpha states
• Possible eta-mesic 3He states within the finite rank approximation
• A study of the $KN$-$K^{\ast }N$ coupled systems
• Searching for exotic states in the $N\pi K$ system
• Resonances and adiabatic invariance in classical and quantum scattering theory
• Time in dissipative tunneling: subtleties and applications
• Time-delay in a multi-channel formalism
• Wigner time delay of a particle elastically scattered by a cluster of zero-range potentials
• Three body dwell time