Heavy quark spin structure in $Z_b$ resonances
By A. Bondar, A. Garmash, A. Milstein, R. Mizuk, M. Voloshin. 2011
172 citations recorded by the source corpus.
We discuss the heavy quark spin structure of the recently observed `twin' resonances $Z_b(10610)$ and $Z_b(10650)$ assuming that these are mostly of a `molecular' type, i.e. that their internal dynamics is dominated by the coupling to meson pairs $B^* \bar B - B {\bar B}^*$ and $B^* {\bar B}^*$. We find that the state of the $b \bar b$ pair within the $Z_b(10610)$ and $Z_b(10650)$ resonances is a mixture of a spin-triplet and a spin-singlet of equal amplitude and with the phase orthogonal between the two resonances. Such a structure gives rise to specific relations between observable amplitudes that are in agreement with the data obtained recently by Belle. We also briefly discuss possible properties of the isotopically singlet counterparts of the newly found resonances, and also of their $C$ ($G$) parity opposites that likely exist in the same mass range near the open $B$ flavor threshold.
Subfields: Nuclear and High Energy Physics
View Paper: https://www.semanticscholar.org/paper/88f4f23194215313dcf062bf0d972a598daa5a37
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In Nuclear and High Energy Physics
Citations in the corpus
- The XYZ states: Experimental and theoretical status and perspectives (2019, background): “Both features find a natural explanation if Zb(10610) and Zb(10650) are assumed to be B∗B̄ and B∗B̄∗ molecular states [566], for then one finds”
- Hadronic molecules (2017, background): “10 makes both excellent candidates for hadronic molecules (Bondar et al., 2011)5 This statement finds further support in the observation that both states also decay by far most probably into BB̄∗ and B∗B̄∗, respectively (Garmash et al., 2016) (see Tab.”
- Exotics: Heavy pentaquarks and tetraquarks (2017, background): “ut has not been investigated yet. There are numerous attempts to explain the Z b states e.g. coupled channel eects [259], a cusp eect [260] or tetraquarks [248] [261]. A particular attempt was made [262] to explain the states along with the anomalous observations in h b production. The ansatz is to ”