منابع مشابه
Hadronic molecules : meson - baryon hybrids
The existence of hadronic molecular-type hybrids consisting of a baryon and a meson is argued. Long-range interactions due to one-pion exchange are shown to be strong enough to produce a loosely bound state. Specific features of a molecular hybrid are discussed.
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An adiabatic approximation is used to derive the binding potential between two heavy-light mesons in quenched SU(2)-colour lattice QCD. Analysis of the meson-meson system shows that the potential is attractive at shortand medium-range. The numerical data is consistent with the Yukawa model of pion exchange.
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It is argued that radiative decays of scalars a0/f0(980) can serve as a decisive tool in establishing the nature of the latter. In particular, predictions for the widths of the radiative decays S → γV (S = a0/f0(980), V = ω/ρ/γ) are given in the framework of the molecule model of the scalars. Finite–range corrections are discussed in detail for the two-gamma decays of hadronic molecules, with a...
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In many calculations of the two–photon decay of hadronic molecules, the decay matrix element is estimated using the wave function at the origin prescription, in analogy to the two–photon decay of parapositronium. We question the applicability of this procedure to the two–photon decay of hadronic molecules for it introduces an uncontrolled model dependence into the calculation. As an alternative...
متن کاملExotic Pentaquarks, Crypto-heptaquarks and Linear Three-hadronic Molecules
In this talk, multiquarks are studied microscopically in a standard quark model. In pure ground-state pentaquarks the short-range interaction is computed and it is shown to be repulsive, a narrow pentaquark cannot be in the groundstate. As a possible excitation, an additional quark-antiquark pair is then considered, and this is suggested to produce linear molecular system, with a narrow decay w...
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ژورنال
عنوان ژورنال: Reviews of Modern Physics
سال: 2018
ISSN: 0034-6861,1539-0756
DOI: 10.1103/revmodphys.90.015004