Study of theΛ−NSystem in Low-EnergyΛ−pElastic Scattering

Abstract

The present paper is based on 378 A-p elastic scattering events in the incident-momentum region 120-320 MeV/c. Differential and total cross sections have been measured in several momentum intervals and found to be consistent with predominantly S-wave scattering. No significant indication for the existence of a low-energy A-p resonance has been found. Using the effective-range approximation, the four scattering parameters a s , a t , r Sf and r t were evaluated with and without further assumptions on the A-p interaction properties. Best values obtained from the four-parameter fit were #«= -1.8, a t = -1.6, r s = 2.8, and r t = 3.3 F. A likelihood-function mapping procedure is used to describe the large and strongly correlated errors of these values. LOW-ENERGYA-p ELASTIC SCATTERING

Hyperon–nucleon interactions—a chiral effective field theory approach

“…The experimental cross sections in a are taken from Refs. [27] (open squares) and [28] (filled circles), in b from Refs. [30] (filled circles) and [31] (open squares) and in c,d from [23].…”

Jülich hyperon-nucleon model revisited

“…In the fitting procedure we only take into account data on total cross sections (and energies near the corresponding thresholds) for the channels p [30][31][32]…”

“…9 are likewise genuine predictions of our YN model. We want to point out that the empirical information in those figures comes from data taken from a finite momentum interval, e.g., 160 < p lab < 180 MeV/c for the + p channel [30], whereas the calculations were performed for the central value of that momentum interval as it is given in the various plots. Note also that the original YN model of the Jülich group was fitted to the data without including the Coulomb interaction (and without taking into account the mass splitting between − , 0 , and + ).…”

StrangenessS=−1hyperon-nucleon scattering in covariant chiral effective field theory

“…[5,29]. It contains 36 data, of which 35 are total cross sections of ΛN and ΣN reactions [78][79][80][81] with the laboratory momentum smaller than approximately 300 MeV/c, P lab < 300 MeV/c.…”