Quark mass dependence of s-wave baryon resonances
نویسندگان
چکیده
منابع مشابه
Quark mass dependence of baryon properties
I discuss the quark mass dependence of various baryon properties derived from chiral perturbation theory. Such representations can eventually be used as chiral extrapolation functions when lattice data at sufficiently small quark masses become available. The quark mass dependence is encoded in loop and contact term contributions, the latter given in terms of low-energy constants. I stress the i...
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The present-day interpretation of QCD lattice simulations requires a profound understanding of the dependence of observable quantities on the light quark masses. A powerful tool to derive such dependencies is the chiral Lagrangian, an effective field theory based on the chiral properties of QCD. The application of strict chiral perturbation theory to the SU(3) flavor sector of QCD is plagued by...
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Identifying a zero-range exchange of vector mesons as the driving force for the s-wave scattering of pseudo-scalar mesons off the baryon ground states, a rich spectrum of molecules is formed. We argue that chiral symmetry and large-Nc considerations determine that part of the interaction which generates the spectrum. We suggest the existence of strongly bound crypto-exotic baryons, which contai...
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Identifying the zero-range exchange of vector mesons as the driving force for the swave scattering of pseudo-scalar mesons off the baryon ground states, the spectrum of 3 2 − molecules is computed. We predict a strongly bound 15-plet of C = −1 states. A narrow crypto-exotic octet of charm-zero states is foreseen. In the C = +1 sector a sextet of narrow resonances is formed due to the interactio...
متن کاملStructure of near-threshold s-wave resonances.
We study the structure of two-body s-wave bound states as well as resonances in the threshold energy region. We focus on the single-channel scattering where the scattering length and the effective range are given by real numbers. It is shown that, in the energy region where the effective range expansion is valid, the properties of resonances are constrained only by the position of the pole. We ...
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ژورنال
عنوان ژورنال: Physics Letters B
سال: 2004
ISSN: 0370-2693
DOI: 10.1016/j.physletb.2003.11.073