Observation of a structure in the $$M_{p\eta }$$ invariant mass distribution near 1700 $$\hbox {MeV}/\hbox {c}^2$$ in the $$\gamma \mathbf {p \rightarrow p \pi ^0 \eta } $$ reaction

Metag, V.; Nanova, M.; Hartmann, J.; Mahlberg, P.; Afzal, F.; Bartels, Clara; Bayadilov, D.; Beck, R.; Becker, M.; Blanke, E.; Brinkmann, K.-Th.; Ciupka, S.; Credé, V.; Dieterle, M.; Dutz, H.; Elsner, D.; Frommberger, F.; Gridnev, A.; Gottschall, M.; Grüner, M.; Hammann, Ch.; Hannappel, J.; Hillert, W.; Hoff, J.; Hoffmeister, P.; Honisch, Christiane; Jude, Thomas; Kalinowsky, H.; Kalischewski, F.; Keshelashvili, I.; Ketzer, B.; Klassen, P.; Клейн, Ф.; Koop, K.; Kroenert, P.; Krusche, B.; Lang, Μ.; Lopatin, I.; Messi, F.; Meyer, W.; Mitlasóczky, B.; Müller, J.; Müllers, J.; Nikonov, V. A.; Novinsky, V.; Novotny, R.; Piontek, D.; Reicherz, G.; Richter, L.; Rostomyan, T.; Runkel, S.; Salisbury, Ben; Sarantsev, A.; Schaab, D.; Schmidt, Ch.; Schmieden, H.; Schultes, J.; Seifen, T.; Sokhoyan, V.; Sowa, C.; Spieker, K.; Stausberg, N.; Thiel, A.; Thoma, U.; Triffterer, T.; Urban, M.; Urff, G.; Pee, H. van; Wagner, M. N.; Walther, Dirk; Wendel, Ch.; Werthmüller, D.; Wiedner, U.; Wilson, A.; Winnebeck, A.; Witthauer, L.; Wunderlich, Y.

doi:10.1140/epja/s10050-021-00634-1

Cited by 9 publications

(7 citation statements)

References 93 publications

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“…Calculations indicate that this structure could be generated by a triangle singularity where the pion of the decay of a a 0 (980) re-scatters with the proton of the reaction and forms a ∆ resonance. Further details about this calculation can be found in [37]. More details about structures arising from triangle singularities, as also observed by the BGOOD experiment [38], can be expected in the future.…”

Section: Recent Developmentsmentioning

confidence: 79%

“…In the last decade, three different experiments contributed dominantly to the field of baryon spectroscopy. First of all there is the CBELSA/TAPS experiment [37] at the ELSA accelerator facility in Bonn, Germany, which is able to excite polarized or unpolarized nucleons by circularly or linearly polarized photons with up to E γ = 3.2 GeV. The detector setup is ideally suited to measure final states comprising photons, therefore it is focused on reactions containing neutral mesons.…”

Section: Experimental Facilitiesmentioning

confidence: 99%

“…This triggered a lot of investigations and discussions also in the field of baryon spectroscopy about the origin of observed structures. Recently, the CBELSA/TAPS collaboration reported indeed an unidentified peak in the pη invariant mass for the final state pπ 0 η [37]. Calculations indicate that this structure could be generated by a triangle singularity where the pion of the decay of a a 0 (980) re-scatters with the proton of the reaction and forms a ∆ resonance.…”

Section: Recent Developmentsmentioning

confidence: 99%

See 2 more Smart Citations

Light baryon spectroscopy

Thiel

2022

Supl. Rev. Mex. Fis.

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One of the unresolved questions in Hadron Physics comes from the field of Baryon Spectroscopy. Here, the exact interaction between the quarks inside the nucleons is investigated via measurement of the excitation spectrum of the nucleons. Comparison to constituent quark models as well as lattice QCD calculations reveal substantial differences is the number of observed states and in the mass hierarchy of the first excitations. This proceeding will give a short recap about the current developments in the field of Light Baryon Spectroscopy.

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Section: Recent Developmentsmentioning

confidence: 79%

Section: Experimental Facilitiesmentioning

confidence: 99%

Section: Recent Developmentsmentioning

confidence: 99%

See 1 more Smart Citation

Light baryon spectroscopy

Thiel

2022

Supl. Rev. Mex. Fis.

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“…Investigations have started about the impact of this result for baryon spectroscopy. First publications have now been submitted, were signatures of this process could also be observed in measurements of baryonic states [497,498]. Further discussions about this topic can be expected in the future.…”

Section: Impact On the Listing Of Baryon Resonancesmentioning

confidence: 85%

Light Baryon Spectroscopy

Thiel,

Afzal,

Wunderlich

2022

Preprint

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This review treats the advances in Light Baryon Spectroscopy of the last two decades, which were mainly obtained by measuring meson-production reactions at photon facilities all over the world. We provide a consistent compendium of experimental results, as well as a review of the theoretical methods of amplitude analysis used to analyze the data. The most significant datasets are presented in detail and are listed in combination with a full set of the relevant references. In addition, a brief summary of spin-formalisms, which are ubiquitous in Light Baryon Spectroscopy, as well as a review on complete experiments, are provided. The synthesis of the reviewed knowledge is presented in a full interpretation of the new results on the Light Baryon Spectrum.

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“…So the model analysis of this structure was expected to be refined soon. The signal of its isospin partners was claimed to be present in the γN → ηπN by Graal [63], however, it was not confirmed by CBELSA/TAPS [64] and A2@MAMI groups [65,66]. Together with this state, a narrow structure at 1720 MeV close to ωp threshold was also observed in γp → γp [67], quasifree γn → ηn [38] and high-precision πp elastic data from EPECUR Collaboration [68,69].…”

Section: Introductionmentioning

confidence: 99%

Photo- and electro-production of narrow exotic states: from light quarks to charm and up to bottom

Xu¹

2023

Preprint

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Accessing a full image of the inner content of hadrons represents a central endeavour of modern particle physics, with the main scientific motivation to investigate the strong interaction binding the visible matter. On the one hand, the structure of known exotic candidates is a fundamental open issue addressed widely by scientists. On the other hand, looking for new states of exotic nature is a central component for theoretical and experimental efforts from electron-positron machine and electron accelerator with fixed target to heavy ion and electron-ion colliders. In this article we present a succinct short overview of the attempt to search for exotic narrow N * and Z states containing light quarks only or also charm, and its connotation for bottom regions (the latter two are also known as P c (Z c ) and P b (Z b ) states, respectively in the literature). We address the effort of searching for exotic narrow N * and Z states in light quark sector. We focus on recent progress in searching for signal of P c and Z c states photoproduction and its implication into the P b and Z b photoproduction and their decay properties. We also discuss future perspectives for the field in electron-ion colliders, a good place to disentangle the nature of some of these states and investigate some other enlightening topics including QCD trace anomaly and quarkonium-nucleon scattering length.

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Observation of a structure in the $$M_{p\eta }$$ invariant mass distribution near 1700 $$\hbox {MeV}/\hbox {c}^2$$ in the $$\gamma \mathbf {p \rightarrow p \pi ^0 \eta } $$ reaction

Cited by 9 publications

References 93 publications

Light baryon spectroscopy

Light baryon spectroscopy

Light Baryon Spectroscopy

Photo- and electro-production of narrow exotic states: from light quarks to charm and up to bottom

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