We propose a new interpretation of the neutral and charged X,Z exotic hadron resonances. Hybridized-tetraquarks are neither purely compact tetraquark states nor bound or loosely bound molecules but rather a manifestation of the interplay between the two. While meson molecules need a negative or zero binding energy, its counterpart for h -tetraquarks is required to be positive. The formation mechanism of this new class of hadrons is inspired by that of Feshbach metastable states in atomic physics. The recent claim of an exotic resonance in the View the MathML source channel by the D0 Collaboration and the negative result presented subsequently by the LHCb Collaboration are understood in this scheme, together with a considerable portion of available data on X,Z particles. Considerations on a state with the same quantum numbers as the X(5568) are also made.

Hybridized tetraquarks / Esposito, A.; Pilloni, Alessandro; Polosa, ANTONIO DAVIDE. - In: PHYSICS LETTERS. SECTION B. - ISSN 0370-2693. - STAMPA. - 758:(2016), pp. 292-295. [10.1016/j.physletb.2016.05.028]

Hybridized tetraquarks

Esposito, A.;PILLONI, ALESSANDRO;POLOSA, ANTONIO DAVIDE
2016

Abstract

We propose a new interpretation of the neutral and charged X,Z exotic hadron resonances. Hybridized-tetraquarks are neither purely compact tetraquark states nor bound or loosely bound molecules but rather a manifestation of the interplay between the two. While meson molecules need a negative or zero binding energy, its counterpart for h -tetraquarks is required to be positive. The formation mechanism of this new class of hadrons is inspired by that of Feshbach metastable states in atomic physics. The recent claim of an exotic resonance in the View the MathML source channel by the D0 Collaboration and the negative result presented subsequently by the LHCb Collaboration are understood in this scheme, together with a considerable portion of available data on X,Z particles. Considerations on a state with the same quantum numbers as the X(5568) are also made.
2016
Exotic hadrons; Feshbach resonances; Tetraquarks; Nuclear and High Energy Physics
01 Pubblicazione su rivista::01a Articolo in rivista
Hybridized tetraquarks / Esposito, A.; Pilloni, Alessandro; Polosa, ANTONIO DAVIDE. - In: PHYSICS LETTERS. SECTION B. - ISSN 0370-2693. - STAMPA. - 758:(2016), pp. 292-295. [10.1016/j.physletb.2016.05.028]
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11573/904102
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