Influence of a Z„1540... resonance on KN scattering
نویسندگان
چکیده
The impact of a sI=0, JP= 1 2 +dZ+s1540d resonance with a width of 5 MeV or more on the K+NsI=0d elastic cross section and on the P01 phase shift is examined within the KN meson-exchange model of the Jülich group. It is shown that the rather strong enhancement of the cross section caused by the presence of a Z+ with the above properties is not compatible with the existing empirical information on KN scattering. Only a much narrower Z+ state could be reconciled with the existing data—or, alternatively, the Z+ state must lie at an energy much closer to the KN threshold.
منابع مشابه
ar X iv : h ep - p h / 03 09 24 3 v 1 2 1 Se p 20 03 Influence of a Z + ( 1540 ) resonance on K + N scattering
The impact of a (I = 0, J P = 1 2 +) Z + (1540) resonance with a width of 5 MeV or more on the K + N (I=0) elastic cross section and on the P 01 phase shift is examined within the KN meson-exchange model of the Jülich group. It is shown that the rather strong enhancement of the cross section caused by the presence of a Z + with the above properties is not compatible with the existing empirical ...
متن کاملar X iv : h ep - p h / 06 10 09 1 v 1 9 O ct 2 00 6 Strange meson - nucleon states in the quark potential model
The quark potential model and resonating group method are used to investigate the KN bound states and/or resonances. The model potential consists of the t-channel and s-channel one-gluon exchange potentials and the confining potential with incorporating the QCD renormalization correction and the spin-orbital suppression effect in it. It was shown in our previous work that by considering the col...
متن کاملEvidence of Pentaquark States from KN Scattering Data?
Motivated by the recent experimental evidence of the exotic B = S = +1 baryonic state Θ (1540), we examine the older existing data on KN elastic scattering through the time delay method. We find positive peaks in time delay around 1.545 and 1.6 GeV in the D03 and P01 partial waves of K N scattering respectively, in agreement with experiments. We also find an indication of the J = 3/2 Θ∗ spin-or...
متن کاملTime delayed KN reactions and exotic baryon resonances
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 qu...
متن کاملA Review of Pentaquark Calculations on the Lattice
The recent interest in pentaquark baryons has been inspired by the experimental discovery of Θ(1540) whose quark composition is uudds̄. We will not address the experimental situation. It is summarized by T. Nakano in his plenary talk during this conference 1. In the past few years, there has been quite an effort to calculate these pentaquark states to see if they can be observed in lattice QCD c...
متن کامل