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Title Quark-mass dependence of baryon resonances Author info M. F. M. Lutz, C. Garcia-Recio ... [et al.] Author Lutz Matthias F. M. (25%)
Co-authors Garcia-Recio C. (25%)
Kolomeitsev Evgeni E. 1970- (25%) UMBFP06 - Katedra fyziky
Nieves J. (25%)
Source document Nuclear Physics A. Vol. 754 (2005), pp. 212C-220C. - Amsterdam : Elsevier B.V., 2005 Keywords jadrová fyzika nuclear physics Narrow Baryon Resonances Language English Country Netherlands Annotation We study the quark-mass dependence of J(P) = (1/2-) s-wave and J(P) = 3/2(-) d-wave baryon resonances. Parameter-free results are obtained in terms of the leading order chiral Lagrangian. In the 'heavy' SU(3) limit with m(pi) = m(K) similar or equal to 500 MeV the s-wave resonances turn into bound states forming two octets plus a singlet representations of the SU(3) group. Similarly the d-wave resonances turn into bound states forming an octet and a decuplet in this limit. A contrasted result is obtained in the 'light' SU(3) limit with m(pi) = M-K similar or equal to 140 MeV for which no resonances exist. Public work category ADC No. of Archival Copy 8629 Catal.org. BB301 - Univerzitná knižnica Univerzity Mateja Bela v Banskej Bystrici Database xpca - PUBLIKAČNÁ ČINNOSŤ References PERIODIKÁ-Súborný záznam periodika 
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Title Baryon resonances from chiral coupled-channel dynamics Author info Matthias F. M. Lutz, Evgeni E. Kolomeitsev Author Lutz Matthias F. M. (50%)
Co-authors Kolomeitsev Evgeni E. 1970- (50%) UMBFP06 - Katedra fyziky
Action International Conference on Structure of Baryons . medzinárodná konferencia , 10. , Palaiseau , 25.-29.10.2004 Source document Nuclear Physics A. Vol. 755 (2005), pp. 29C-39C. - Amsterdam : Elsevier B.V., 2005 Keywords atómová fyzika Narrow Baryon Resonances chiral dynamics Language English Country Netherlands systematics 539.1 Annotation We discuss the formation of s- and d-wave baryon resonances as predicted by the chiral SU(3) symmetry of QCD. Based on the leading order term of the chiral Lagrangian a rich spectrum of molecules is generated, owing to final-state interactions. The spectrum of s- and d-wave baryon states with zero and non-zero charm is remarkably consistent with the empirical pattern. In particular, the recently announced Σc(2800) of the BELLE collaboration is reproduced with realistic mass and width parameters. Similarly, the dwave states Λc(2625) and Ξc(2815) are explained naturally as chiral excitations of JP = 3 2 + states. In the open-charm sector exotic multiplet structures are predicted. These findings support a radical conjecture: meson and baryon resonances that do not belong to the large-Nc ground state of QCD should be viewed as hadronic molecular states Public work category ADC No. of Archival Copy 26410 Catal.org. BB301 - Univerzitná knižnica Univerzity Mateja Bela v Banskej Bystrici Database xpca - PUBLIKAČNÁ ČINNOSŤ References PERIODIKÁ-Súborný záznam periodika unrecognised
Title Resonance states below the pion-nucleon threshold and their consequences for nuclear systems Author info Evgeni E. Kolomeitsev, D. N. Voskresensky Author Kolomeitsev Evgeni E. 1970- (50%) UMBFP06 - Katedra fyziky
Co-authors Voskresensky Dmitri (50%)
Source document Physical Review C. Vol. 67, no. 1 (2003), pp. [1-6]. - Maryland : American Physical Society, 2003 Keywords jadrová fyzika Narrow Baryon Resonances dibaryons Language English Country United States of America systematics 539.1 Annotation Regular sequences of narrow peaks have been observed in the missing mass spectra in the reactions pp-->ppi(+)X and pd-->ppX(1) below the pion-production threshold. They are interpreted in the literature as manifestations of supernarrow light dibaryons, nucleon resonances, or light pions forming resonance states with the nucleon in its ground state. We discuss how the existence of such exotic states would affect the properties of nuclear systems. We show that the neutron star structure is drastically changed in all three cases. We find that in the presence of dibaryons or nucleon resonances the maximal possible mass of a neutron star would be smaller than the observational limit. The presence of light pions does not contradict the observed neutron star masses. Light pions allow for the existence of extended nuclear objects of arbitrary size, bound by strong and electromagnetic forces. Public work category ADC No. of Archival Copy 26391 Catal.org. BB301 - Univerzitná knižnica Univerzity Mateja Bela v Banskej Bystrici Database xpca - PUBLIKAČNÁ ČINNOSŤ References PERIODIKÁ-Súborný záznam periodika unrecognised