NLO results with operator mixing for fully heavy tetraquarks in QCD sum rules

Wu, Ren-Hua; Zuo, Yu-Sheng; Wang, Chenyu; Meng, Cai; Ma, Yan-Qing; Chao, Kuang-Ta

doi:10.1007/jhep11(2022)023

“…They predicted several narrow resonances with decay widths less than 30 MeV, which were used to explain the structures observed by LHCb in the di-J/ψ mass spectrum [44]. More theoretical studies considering both the meson-meson and diquark-antidiquark configurations can be found in [612][613][614][615], and there also exist some theoretical studies [616,617] taking the two heavy quark-antiquark pairs as colored clusters.…”

Section: Compact Tetraquark Picturementioning

confidence: 99%

An updated review of the new hadron states

Chen

¹

,

Chen

²

,

Liu

³

et al. 2022

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The past decades witnessed the golden era of hadron physics. Many excited open heavy flavor mesons and baryons have been observed since 2017. We shall provide an updated review of the recent experimental and theoretical progresses in this active field. Besides the conventional heavy hadrons, we shall also review the recently observed open heavy flavor tetraquark states X(2900) and Tcc(3875) as well as the hidden heavy flavor multiquark states X(6900), Pcs(4459), Zcs(3985), Zcs(4000), and Zcs(4220). We will also cover the recent progresses on the glueballs and light hybrid mesons, which are the direct manifestations of the non-Abelian SU(3) gauge interaction of the Quantum Chromodynamics in the low-energy region.

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“…Furthermore, another state around 7.25 GeV with 2 ++ was also obtained in Ref. [454]. Their numerical results show that the next-to-leading order corrections are very important for the fully heavy system, because they not only give significant contributions but also reduce the scheme and scale dependence and make Borel platform more distinct.…”

Section: Color Octet Configurationmentioning

confidence: 78%

“…The authors of Ref. [454] considered the coupling of all structures, which is different from the above work. The authors studied the mass spectra of the fully charm tetraquark systems in QCD sum rules with the complete next-to-leading order contribution to the perturbative QCD part of the correlation functions.…”

Section: Color Octet Configurationmentioning

confidence: 91%

“…The situation of the structure around 6.6 GeV is similar to X(6900), while another structure around 7.2 GeV can possibly be explained as a molecular state, because the energy is near the thresholds of η c (2S)η c (2S) and ψ(2S)ψ(2S). In order to understand the structure and properties of the fully charm tetraquark states, diquark-antidiquark configuration [24,81,432,434,[440][441][442][443][444][445][446][447][448][449][450][451][452][453][454], threshold effect [436,[455][456][457][458][459][460][461], color octet configuration [462,463], Higgs-like boson [464], and hybrid state [465] were proposed in various theoretical frameworks, in which the diquark-antidiquark configuration is the most popular one. In this subsection, we mainly concentrate on the work related to the diquarkantidiquark picture and the color octet configuration explanation.…”

Section: Fully Charm Tetraquark Statesmentioning

confidence: 99%

See 1 more Smart Citation

Tetraquarks and Pentaquarks from Quark Model Perspective

Huang

¹

,

Deng

²

,

Liu

³

et al. 2023

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According to the classification of the quark model, the hadrons going beyond three-quark baryon and quark-antiquark meson pictures are called exotic hadrons. Many new hadrons have been observed since 2003, some of which exhibit exotic behaviors. There are a lot of excellent review articles on exotic hadrons available so far; the present article tries to focus on the recent experimental and theoretical progress on the exotic states from the perspective of the quark model. Although lattice quantum chromodynamics may give the final answer of the problem, the phenomenological models are still powerful tools to explore the exotic states and to provide insight on the phenomenology of hadrons. The spatial and color structures of multiquark states and the channel coupling calculation are emphasized through reviewing some bound states, molecular and color structure resonances. Finally, the unquench effects of some exotic states are reviewed. With the accumulation of experimental data on multiquark states and inspiration of underlying theory developments, more reasonable phenomenological models incorporating multi-body interactions and high Fock components to unify the description of normal hadrons and exotic hadrons are expectable.

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“…Berezhnoy [33]. Moreover, there are also many researches about the narrow structure X (6900) reported by LHCb in 2020 [34][35][36][37][38][39][40][41][42][43][44], and more papers can be found in Ref. [17] and reference there in.…”

Section: Introductionmentioning

confidence: 99%

Investigating full-heavy tetraquarks composed of $$cc{\bar{c}}{\bar{b}}$$ and $$bb{\bar{b}}{\bar{c}}$$

Hu

¹

,

He

²

,

Ping

³

2023

Eur. Phys. J. C

2

0

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The full-heavy tetraquarks $$cc{\bar{c}}{\bar{b}}$$ c c c ¯ b ¯ and $$bb{\bar{b}}{\bar{c}}$$ b b b ¯ c ¯ are systematically investigated within a quark model. The meson–meson structure, diquark–antidiquark structure and K-structure are considered in this work. There is no bound state for $$cc{\bar{c}}{\bar{b}}$$ c c c ¯ b ¯ and $$bb{\bar{b}}{\bar{c}}$$ b b b ¯ c ¯ systems in $$ IJ^{P}=00^{+},01^{+}$$ I J P = 00 + , 01 + and $$ 02^{+}$$ 02 + channels. However, for $$cc{\bar{c}}{\bar{b}}$$ c c c ¯ b ¯ system, three possible resonance states with energy of $$ 10{,}079~\textrm{MeV} $$ 10 , 079 MeV , $$ 10{,}081~\textrm{MeV} $$ 10 , 081 MeV and $$ 10{,}177~\textrm{MeV} $$ 10 , 177 MeV are found in $$ IJ^{P}=00^{+},01^{+}$$ I J P = 00 + , 01 + and $$ 02^{+}$$ 02 + , respectively, and their decay width $$ \Gamma $$ Γ are 6.7–8.4 MeV, 1.4–7.2 MeV and 9.1–11.1 MeV. For $$bb{\bar{b}}{\bar{c}}$$ b b b ¯ c ¯ system, there also exist three possible resonance states with energy of $$ 16{,}474~\textrm{MeV} $$ 16 , 474 MeV , $$ 16{,}474~\textrm{MeV} $$ 16 , 474 MeV and $$ 16{,}541~\textrm{MeV} $$ 16 , 541 MeV in $$ IJ^{P}=00^{+},01^{+}$$ I J P = 00 + , 01 + and $$ 02^{+}$$ 02 + , respectively, and the decay widths $$ \Gamma $$ Γ of them are 2.2–6.1 MeV, 2.2–6.9 MeV and 5.3–8.5 MeV. $$bc{\bar{c}}{\bar{c}}$$ b c c ¯ c ¯ and $$cb{\bar{b}}{\bar{b}}$$ c b b ¯ b ¯ systems will have the same results as $$cc{\bar{c}}{\bar{b}}$$ c c c ¯ b ¯ and $$bb{\bar{b}}{\bar{c}}$$ b b b ¯ c ¯ , respectively. These full-heavy resonance states are worthy to be searched in the future experiments.

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NLO results with operator mixing for fully heavy tetraquarks in QCD sum rules

Cited by 13 publications

References 91 publications

An updated review of the new hadron states

An updated review of the new hadron states

Tetraquarks and Pentaquarks from Quark Model Perspective

Investigating full-heavy tetraquarks composed of $$cc{\bar{c}}{\bar{b}}$$ and $$bb{\bar{b}}{\bar{c}}$$

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