The phenomenology of the exotic hybrid nonet with π1(1600) and η1(1855)

Shastry, Vanamali; Fischer, Christian; Giacosa, Francesco

doi:10.1016/j.physletb.2022.137478

Cited by 19 publications

(13 citation statements)

References 54 publications

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“…In particular, the QCD axial anomaly supports the interpretation of the η 1 (1855) as the ssg hybrid meson [26], which was also supported by the Lattice QCD [27] and the flux tube model picture [28]. An additional hybrid meson explanation of the η 1 (1855) can be found in [29].…”

Section: Introductionsupporting

confidence: 62%

Revealing the inner structure of the newly observed η ₁(1855) via photoproduction

Huang

Zhu

2023

J. Phys. G: Nucl. Part. Phys.

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Very recently, a new hadronic exotic state $\eta_1(1855)$ at the invariant mass spectrum of $\eta\eta^{'}$ was observed by the BESIII Collaboration.According to its properties, such as the mass and decay width, the $\eta_1(1855)$ have been suggested to be a compact multi-quark state, a hadronmolecule, or a hybrid meson. In order to distinguish the various interpretations of the $\eta_1(1855)$, a Reggeized model combined with the vectordominance model for $\eta_1(1855)$ photoproduction on the proton target is presented. The $\eta_1(1855)$ photoproduction is dominated by the $t$-channelvector mesons $\rho$, $\omega$, and $\phi$ exchange. If the $\eta_1(1855)$ is a $s\bar{s}g$ hybrid meson, the Primakoff effect also should be included.Our calculations show that the total cross section of the $\eta_1(1855)$ production via $\gamma{}p$ reaction can reach up to 0.276 pb for $\theta=15^{\circ}$or 0.119 pb for $\theta=0^{\circ}$, about 0.0297$\%$ or 0.0128$\%$ of the total cross section obtained by considering the$\eta_1(1855)$ as an $S$-wave $K\bar{K}_1(1400)$ molecule. We also find their line shapes are sizably different. If the $\eta_1(1855)$ is a molecular state,the photoproduction of $\eta_1(1855)$ near the threshold offers a nice place to test its molecular nature. However, it should be better to take high energy,at least above $E_{\gamma}=16.97$ GeV, to observe the production of $\eta_1(1855)$ if $\eta_1(1855)$ is a $s\bar{s}g$ hybrid meson. These results can be measuredin the GlueX experiment or Electron-Ion Collider in China to test the nature of the $\eta_1(1855)$.

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Section: Introductionsupporting

confidence: 62%

Revealing the inner structure of the newly observed η ₁(1855) via photoproduction

Huang

Zhu

2023

J. Phys. G: Nucl. Part. Phys.

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“…Then, in Refs. [48,49] the additional (not yet measured) states η 1 (1661) and K 1 (1761) have been discussed and their decays have been evaluated, thus offering a prediction for future searches. In the near future, a better theoretical and experimental understanding of this hybrid nonet is expected.…”

Section: Discussionmentioning

confidence: 99%

Conventional mesons below 2 GeV

Giacosa

2022

EPJ Web Conf.

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We briefly review the status of various conventional quark-antiquark mesons below 2 GeV and outline some open questions: the status of the strangeantistrange orbitally excited vector meson, the status of the nonet of axial-tensor mesons (chiral partners of the well known tensor mesons), and the isoscalar mixing angle in the pseudotensor sector, which can eventually represent a novel manifestation of the chiral anomaly.

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“…The product branching fraction B [𝐽/𝜓 → 𝛾𝜂 1 (1855)]B [𝜂 1 (1855) → 𝜂𝜂 ′ ] is measured to be (2.70 ± 0.41 +0. 16 −0.35 ). The 𝜂 1 (1855) has stimulated many theoretical interpretations, such as an isoscalar light hybrid [14][15][16], a 𝐾 K1 (1400) molecular state [17], or a tetraquark state [18].…”

Section: Observation Of An Exotic Isoscalar State 𝜂mentioning

confidence: 99%

“…16 −0.35 ). The 𝜂 1 (1855) has stimulated many theoretical interpretations, such as an isoscalar light hybrid [14][15][16], a 𝐾 K1 (1400) molecular state [17], or a tetraquark state [18]. Further studies with more production mechanisms and decay modes will help clarify the nature of the 𝜂 1 (1855).…”

Section: Observation Of An Exotic Isoscalar State 𝜂mentioning

confidence: 99%

Light Meson Spectroscopy at BESIII

Hou¹

2023

Proceedings of 41st International Conference on High Energy Physics — PoS(ICHEP2022)

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BESIII has the world's largest samples of 𝐽/𝜓 and 𝜓(3686) events from 𝑒 + 𝑒 − annihilations, which offer an ideal laboratory to study light meson spectroscopy, in particular for the search of QCD exotics with gluonic excitations. The observation of a 1 −+ state, 𝜂 1 (1855) in 𝐽/𝜓 → 𝛾𝜂𝜂 ′ , the observation of the 𝑋 (2600) in 𝐽/𝜓 → 𝛾𝜋 + 𝜋 − 𝜂 ′ , and the observation of 𝐽/𝜓 Electromagnetic Dalitz Decays to 𝑋 (1835), 𝑋 (2120) and 𝑋 (2370) will be discussed in this proceeding.

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The phenomenology of the exotic hybrid nonet with π1(1600) and η1(1855)

Cited by 19 publications

References 54 publications

Revealing the inner structure of the newly observed η ₁(1855) via photoproduction

Revealing the inner structure of the newly observed η ₁(1855) via photoproduction

Conventional mesons below 2 GeV

Light Meson Spectroscopy at BESIII

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The phenomenology of the exotic hybrid nonet with π1(1600) and η1(1855)

Cited by 19 publications

References 54 publications

Revealing the inner structure of the newly observed η 1(1855) via photoproduction

Revealing the inner structure of the newly observed η 1(1855) via photoproduction

Conventional mesons below 2 GeV

Light Meson Spectroscopy at BESIII

Contact Info

Product

Resources

About

Revealing the inner structure of the newly observed η ₁(1855) via photoproduction

Revealing the inner structure of the newly observed η ₁(1855) via photoproduction