Total cross section measurement for the three double pion photoproduction channels on the proton

Braghieri, A.; Murphy, L. Y.; Ahrens, J.; Audit, G.; d’Hose, N.; Isbert, V.; Kerhoas, S.; Cormick, M. Mac; Pedroni, P.; Pinelli, T.; Tamas, G.; Zabrodin, A.

doi:10.1016/0370-2693(95)01189-w

Cited by 107 publications

(65 citation statements)

References 13 publications

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“…The photoproduction of two pions on nucleons at low and intermediate energies (up to E γ ∼ 1 GeV) has been the subject of intense experimental [1][2][3][4][5][6] and theoretical [7][8][9][10][11][12][13][14][15][16][17][18][19] study. The works have been mainly motivated to understand the role of the many baryonic resonances involved in the process.…”

Section: Introductionmentioning

confidence: 99%

Helicity asymmetries in double pion photoproduction on the proton

Roca¹

2005

Nuclear Physics A

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Based on a prior model on double pion photoproduction on the proton, successfully tested in total cross sections and invariant mass distributions, we make a theoretical study of the angular dependence of helicity asymmetries from the interaction of circularly polarized photons with unpolarized protons. We show that this observable is sensitive to details of the internal mechanisms and, thus, represents a complementary test of the theoretical model.

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Section: Introductionmentioning

confidence: 99%

Helicity asymmetries in double pion photoproduction on the proton

Roca¹

2005

Nuclear Physics A

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“…Furthermore, the ρ as an intermediate state coupling to two pions was also considered. The model reproduces fairly well the experimental cross section [9]. The model is further improved [10] to account for s − d waves in the N * → ∆π decay, while at the same time reduces from 67 to 20 the number of Feynman diagrams needed to study the reaction in the range of Mainz energies E γ ≤ 800 MeV .…”

mentioning

confidence: 61%

“…[9] can be extended to virtual photons coming from the (e, e ) vertex. These reactions are presently under experimental investigation at TJNAF [24,25].…”

Section: Two Pion Electroproductionmentioning

confidence: 99%

Double Pion Production Reactions

Gómez-Tejedor

Cano

Nácher

et al. 1999

N* Physics and Nonperturbative Quantum Chromodynamics

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Abstract. We report on reactions producing two pions induced by real and virtual photons or nucleons. The role of different resonances in these reactions is emphasized. Novel results on coherent 2π photoproduction in nuclei are also reported.1 Double pion photoproduction on the nucleon.The γN → π + π − N reaction is attracting attentions of both theoretical and experimental groups and is bound to play a significant role in photonuclear reactions much as the γN → πN played in the past.Apart from the work of the Valencia group which I will report here, there is work by other groups. A simplified model containing many of the important features of the reaction was worked out in [1] and improved in [2], [3]. The model of [3] contains more mechanisms than the one of [2], presently under revision [4]. On the other hand, the model of [2] incorporates an approximate unitarization prescription which allows one to go to higher energies with the model. In ref.[5] a simplified model is also used incorporating, however, some ρ decay channels. This work has been revised in [6] in view that some mass distribution was in disagreement with the data, and a new parametrization is offered, which relies on a range parameter for the ρ of the order of 200 MeV , which would not accommodate easily other known facts of phenomenology as the isovector πN s-wave amplitude.The model of [3] contains parameters determined solely from γ and π couplings to nucleons and resonances plus known properties of resonance decay

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“…A large body of data has become available in particular for reactions off the free proton. For incident photon energies up to the second resonance region total cross sections and invariant-mass distributions of the ππ-and the πN -pairs have been measured with the DAPHNE and TAPS detectors at the MAMI accelerator in Mainz [160,161,162,163,164,165,166,19], and at higher incident photon energies at GRAAL in Grenoble (also the linearly polarized beam asymmetry) [18] and at ELSA in Bonn [19,20]. Also the first double polarization observables (E, longitudinally polarized target, circularly polarized beam) have been measured in the context of the GerasimovDrell-Hearn project [167,168,169].…”

Section: Meson Photoproduction Off the Neutron -Double Pion Productionmentioning

confidence: 99%

Photoproduction of mesons off nuclei

Krusche

2011

Eur. Phys. J. Spec. Top.

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Abstract. Recent results for the photoproduction of mesons off nuclei are reviewed. These experiments have been performed for two major lines of research related to the properties of the strong interaction. The investigation of nucleon resonances requires light nuclei as targets for the extraction of the isospin composition of the electromagnetic excitations. This is done with quasi-free meson photoproduction off the bound neutron and supplemented with the measurement of coherent photoproduction reactions, serving as spin and/or isospin filters. Furthermore, photoproduction from light and heavy nuclei is a very efficient tool for the study of the interactions of mesons with nuclear matter and the in-medium properties of hadrons. Experiments are currently rapidly developing due to the combination of high quality tagged (and polarized) photon beams with state-of-the-art 4π detectors and polarized targets.

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Total cross section measurement for the three double pion photoproduction channels on the proton

Cited by 107 publications

References 13 publications

Helicity asymmetries in double pion photoproduction on the proton

Helicity asymmetries in double pion photoproduction on the proton

Double Pion Production Reactions

Photoproduction of mesons off nuclei

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