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Sokhoyan, V.; Gutz, E.; Pee, H. van; Anisovich, A. V.; Bacelar, J. C. S.; Bantes, B.; Bartholomy, O.; Bayadilov, D.; Beck, R.; Beloglazov, Y. A.; Castelijns, R.; Credé, V.; Dutz, H.; Elsner, D.; Ewald, R.; Frommberger, F.; Fuchs, Markus; Funke, Ch.; Gregor, R.; Gridnev, A.; Hillert, W.; Hoffmeister, P.; Horn, I.; Jaeglé, I.; Junkersfeld, J.; Kalinowsky, H.; Kammer, S.; Kleber, V.; Klein, Frank; Клейн, Ф.; Klempt, E.; Kotulla, M.; Krusche, B.; Lang, Μ.; Löhner, H.; Lopatin, I.; Lugert, S.; Mertens, T.; Messchendorp, J. G.; Metag, V.; Nanova, M.; Nikonov, V. A.; Novinski, D.; Novotny, R.; Ostrick, M.; Pant, L. M.; Pfeiffer, M.; Piontek, D.; Roy, A.; Sarantsev, A.; Schmidt, Ch.; Schmieden, H.; Shende, S.; Suele, A.; Sumachev, V. V.; Szczepanek, T.; Thiel, A.; Thoma, U.; Trnka, D.; Varma, R.; Walther, Dirk; Wendel, Ch.; Wilson, A.

doi:10.1016/j.physletb.2015.04.063

Cited by 15 publications

(8 citation statements)

References 43 publications

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“…The polarization data have made a dramatic impact on state-of-the-art Partial Wave Analyses. They have uncovered new nucleon and ∆ resonances that were not previously revealed in the analysis of experiments with pion beams [26,27,28]. However, the ability to photoproduce and then identify excited baryons much above 2 GeV may be difficult.…”

Section: Experimental Studiesmentioning

confidence: 99%

Resonances in QCD

et al. 2016

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We report on the EMMI Rapid Reaction Task Force meeting 'Resonances in QCD', which took place at GSI October 12-14, 2015. A group of 26 people met to discuss the physics of resonances in QCD. The aim of the meeting was defined by the following three key questions:. •What is needed to understand the physics of resonances in QCD?•Where does QCD lead us to expect resonances with exotic quantum numbers?•What experimental efforts are required to arrive at a coherent picture? For light mesons and baryons only those with up, down and strange quark content were considered. For heavy-light and heavy-heavy meson systems, those with charm quarks were the focus.This document summarizes the discussions by the participants, which in turn led to the coherent conclusions we present here. © 2016 Elsevier B.V

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Section: Experimental Studiesmentioning

confidence: 99%

Resonances in QCD

et al. 2016

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“…Nevertheless, such reactions must also be studied in order to reveal the isospin structure of the excitations. Recently, many new precise experimental results accompanied by detailed reaction analyses became available for pion pairs [3,4,5,6,7,8,9,10,11,12,13].…”

Section: Introductionmentioning

confidence: 99%

Photoproduction of $\eta$ $\pi$ pairs off nucleons and deuterons

Käser¹,

Müller²,

Ahrens³

et al. 2016

Eur. Phys. J. A

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Quasi-free photoproduction of πη-pairs has been investigated from threshold up to incident photon energies of 1.4 GeV, respectively up to photon-nucleon invariant masses up to 1.9 GeV. Total cross sections, angular distributions, invariant-mass distributions of the πη and meson-nucleon pairs, and beam-helicity asymmetries have been measured for the reactions γp → pπ 0 η, γn → nπ 0 η, γp → nπ + η, and γn → pπ − η from nucleons bound inside the deuteron. For the γp initial state data for free protons have also been analyzed. Finally, the total cross sections for quasi-free production of π 0 η pairs from nucleons bound in 3 He nuclei have been investigated in view of final state interaction (FSI) effects. The experiments were performed at the tagged photon beam facility of the Mainz MAMI accelerator using an almost 4π covering electromagnetic calorimeter composed of the Crystal Ball and TAPS detectors. The shapes of all differential cross section data and the asymmetries are very similar for protons and neutrons and agree with the conjecture that the reactions are dominated by the sequential ∆ ⋆ 3/2 − → η∆(1232) → πηN decay chain, mainly with ∆(1700)3/2 − and ∆(1940)3/2 − . The ratios of the magnitude of the total cross sections also agree with this assumption. However, the absolute magnitudes of the cross sections are reduced by FSI effects with respect to free proton data.

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“…Different observables for the photoproduction of π 0 pairs off the proton were investigated in the past for the second resonance region composed of the N (1440)1/2 + , N (1535)1/2 − , and N (1520)3/2 − nucleon states with the DAPHNE [9,23], TAPS [24,25,11], and Crystal Ball/TAPS [13,14,26,27,28] detectors at the MAMI accelerator in Mainz. Two of those experiments [13,28] also covered the energy range of the third nucleon resonance region for which further measurements have been reported from the GRAAL experiment [29] and from the Crystal Barrel/TAPS setup at ELSA [8,11,12,30,31]. This reaction has been analyzed in the framework of different models.…”

Section: Introductionmentioning

confidence: 99%

Photoproduction of $ \pi^{0}$ -pairs off protons and off neutrons

Dieterle¹,

Oberle²,

Ahrens³

et al. 2015

Eur. Phys. J. A

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Abstract. Total cross sections, angular distributions, and invariant-mass distributions have been measured for the photoproduction of π 0 π 0 pairs off free protons and off nucleons bound in the deuteron. The experiments were performed at the MAMI accelerator facility in Mainz using the Glasgow photon tagging spectrometer and the Crystal Ball/TAPS detector. The accelerator delivered electron beams of 1508 and 1557 MeV, which produced bremsstrahlung in thin radiator foils. The tagged photon beam covered energies up to 1400 MeV. The data from the free proton target are in good agreement with previous measurements and were only used to test the analysis procedures. The results for differential cross sections (angular distributions and invariant-mass distributions) for free and quasi-free protons are almost identical in shape, but differ in absolute magnitude up to 15%. Thus, moderate final-state interaction effects are present. The data for quasi-free neutrons are similar to the proton data in the second resonance region (final-state invariant masses up to ≈ 1550 MeV), where both reactions are dominated by the N (1520)3/2 − → Δ(1232)3/2 + π decay. At higher energies, angular and invariant-mass distributions are different. A simple analysis of the shapes of the invariant-mass distributions in the third resonance region is consistent with strong contributions of an N → Nσ decay for the proton, while the reaction is dominated by a sequential decay via a Δπ intermediate state for the neutron. The data are compared to predictions from the Two-Pion-MAID model and the Bonn-Gatchina coupled-channel analysis.

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Data onIsandIcin

Cited by 15 publications

References 43 publications

Resonances in QCD

Resonances in QCD

Photoproduction of $\eta$ $\pi$ pairs off nucleons and deuterons

Photoproduction of $ \pi^{0}$ -pairs off protons and off neutrons

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