Hybridized tetraquarks

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• 作者：A. Esposito^a ; A. Pilloni^b ; ^c ; A.D. Polosa^d ; ^c ; ^e ; ^{antonio.polosa@cern.ch" class="auth_mail" title="E-mail the corresponding author}
• 关键词：Tetraquarks ; Exotic hadrons ; Feshbach resonances
• 刊名：Physics Letters B
• 出版年：2016
• 出版时间：10 July 2016
• 年：2016
• 卷：758
• 期：Complete
• 页码：292-295
• 全文大小：273 K

文摘

We propose a new interpretation of the neutral and charged X,Z$X,Z$ 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 5b2dc2a2bead956119786f7db23c41e6">$B_s^0{\pi }^{\pm }$ 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$X,Z$ particles. Considerations on a state with the same quantum numbers as the X(5568)$X(5568)$ are also made.