Study of the quasi-free<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" altimg="si1.gif" overflow="scroll"><mml:mrow><mml:mi mathvariant="italic">np</mml:mi></mml:mrow><mml:mo stretchy="false">→</mml:mo><mml:mrow><mml:mi mathvariant="italic">np</mml:mi></mml:mrow><mml:msup><mml:mrow><mml:mi>π</mml:mi></mml:mrow><mml:mrow><mml:mo>+</mml:mo></mml:mrow></mml:msup><mml:msup><mml:mrow><mml:mi>π</mml:mi></mml:mrow><mml:mrow><mml:mo>−</mml:mo></mml:mrow></mml:msup></mml:math>reaction with a deuterium beam

Agakishiev, G.; Bałanda, A.; Belver, D.; Belyaev, A.; Blanco, A.; Böhmer, M.; Boyard, J. L.; Braun‐Munzinger, P.; Cabanelas, P.; Castro, E.; Chernenko, S.; Christ, T.; Destefanis, M.; Díaz, Julio Pérez; Dohrmann, F.; Dybczak, A.; Fabbietti, L.; Fateev, O.; Finocchiaro, P.; Fonte, P.; Friese, J.; Fröhlich, I.; Galatyuk, T.; Garzón, J. A.; Gernhäuser, R.; Gil, A.; Gilardi, C.; Göbel, K.; Golubeva, M.; González-Díaz, D.; Guber, F.; Gumberidze, M.; Hennino, T.; Holzmann, R.; Ierusalimov, A.; Iori, I.; Ivashkin, A.; Jurković, M.; Kämpfer, B.; Karavicheva, T.; Kirschner, D.; Köenig, I.; Koenig, W.; Kolb, B. W.; Kötte, R.; Křížek, F.; Krücken, R.; Kühn, W.; Куглер, А.; Kurepin, A.; Kurilkin, A.; Kurilkin, P. K.; Ladygin, V. P.; Lang, S.; Lange, J. S.; Lapidus, K.; Liu, T.; Lopes, L.; Lorenz, M.; Maier, L.; Mangiarotti, A.; Markert, J.; Metag, V.; Michalska, B.; Michel, J.; Morinière, E.; Mousa, J.; Müntz, C.; Naumann, L.; Otwinowski, J.; Pachmayer, Y.; Pałka, M.; Parpottas, Y.; Pechenov, V.; Pechenova, O.; Pietraszko, J.; Przygoda, W.; Ramstein, B.; Reshetin, A.; Rustamov, A.; Sadovsky, A.; Salabura, P.; Schmah, A.; Schwab, E.; Sobolev, Yu. G.; Spataro, S.; Spruck, B.; Ströbele, H.; Stroth, J.; Sturm, C.; Tarantola, A.; Teilab, K.; Tlustý, P.; Traxler, M.; Trębacz, R.; Tsertos, H.; Wagner, V.; Vasiliev, T.; Weber, M.; Wiśniowski, M.; Wójcik, Tomasz; Wüstenfeld, J.; Yurevich, S.; Zanevsky, Y.; Zhou, Pei

doi:10.1016/j.physletb.2015.09.016

Cited by 28 publications

(22 citation statements)

References 54 publications

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“…Follow-up measurements of the non-fusion reactions pn → ppπ 0 π − [9] and pn → pnπ 0 π 0 [10] with the WASA detector at COSY and np → npπ + π − [11] with the HADES detector at GSI showed that also these reactions, which are partially of isoscalar character, show the d * (2380) resonance in agreement with expectations based on isospin coupling.…”

Section: Introductionsupporting

confidence: 62%

Examination of the nature of the ABC effect

2017

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Recently it has been shown by exclusive and kinematically complete experiments that the appearance of a narrow resonance structure in double-pionic fusion reactions is strictly correlated with the appearance of the so-called ABC effect, which denotes a pronounced low-mass enhancement in the ππ-invariant mass spectrum. Whereas the resonance structure got its explanation by the d * (2380) dibaryonic resonance, a satisfactory explanation for the ABC effect is still pending. In this paper we discuss possible explanations of the ABC effect and their consequences for the internal structure of the d * dibaryon. To this end we examine and review a variety of proposed explanations for the ABC effect, add a new hypothesis and confront all of them with the experimental results for the np → dπ 0 π 0 and np → npπ 0 π 0 reactions, which are the most challenging ones for this topic.

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Section: Introductionsupporting

confidence: 62%

Examination of the nature of the ABC effect

2017

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“…In ref. [20], the corresponding amplitude is deduced from the modified Valencia model, which gave a fair description of np → npπ + π − measured by HADES at the same energy [21]. A realistic test of the contribution of the double-Δ excitation to the e + e − production can be only supplied once the effect is included as a coherent contribution in a full model including the nucleon and Δ(1232) graphs, like the OBE calculation [20] and if all distributions are provided for a comparison with the differential distributions measured in the exclusive np → npe + e − .…”

Section: Discussionmentioning

confidence: 99%

“…The measured yield was corrected for the detection and the reconstruction inefficiencies and losses in the HADES acceptance due to the incomplete azimuthal coverage. The overall normalization error was estimated to be 7%, where 4% was derived from the error of the reference differential cross section [25] and almost 6% was the systematic error of the reconstruction of events with elastic scattering in HADES [21].…”

Section: Normalizationmentioning

confidence: 99%

“…2). Indeed, such a double-Δ excitation is known to be an important channel for the two-pion production at these energies [21,22] and is governed by the t-or u-channel meson exchange. The amplitude for the transition of the n-p system to the NNρ final state via a Δ-Δ state is proportional to the respective isospin recoupling coefficients (9j-symbols) which for the p-p reactions is zero.…”

Section: Introductionmentioning

confidence: 99%

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Analysis of the exclusive final state npe+e- in the quasi-free np reaction

Adamczewski-Musch¹,

Arnold²,

Atomssa³

et al. 2017

Eur. Phys. J. A

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Abstract. We report on the investigation of dielectron production in tagged quasi-free neutron-proton collisions by using a deuteron beam of kinetic energy 1.25 GeV/u impinging on a liquid hydrogen target. Our measurements with HADES confirm a significant excess of e + e − pairs above the π 0 mass in the exclusive channel dp → npe + e − (pspect) as compared to the exclusive channel ppe + e − measured in proton-proton

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“…The separation of the primary deuteron and secondary beams at focus point F6 is provided by the modernized analyzing magnet SP-41 [35]. The physics at F6 is related with the baryonic resonances spin properties studies at the energies between 2 and 6 GeV of the deuteron kinetic energy and includes the measurements of the tensor A yy and vector A y analyzing powers in quasi-elastic and inelastic A(d, pp)X reaction; of the tensor A yy and vector A y analyzing powers in the inelastic deuteron scattering A(d, d )X [47] and A(d, d )π ± X reactions; investigation of the vector analyzing power in neutron induced reactions (with the proton spectator detection) like np → pn, np → ppπ − , np → npπ + π − [49,50] etc. For these experiments the full size RPC wall is required.…”

Section: Other Possible Reaction At Extracted Deuteron Beammentioning

confidence: 99%

Investigation of reactions using polarized and unpolarized deuteron beam at Nuclotron: current status and perspectives

et al. 2017

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Abstract. Deuteron induced reactions at intermediate energies are investigated at InternalTarget Station (ITS) of Nuclotron. The dp elastic scattering data have been accumulated in the angular range (70 • -120 • ) in c.m from 0.3 to 2.0 GeV of deuteron energy. Part of the obtained results of differential cross sections and analyzing powers of dp elastic scattering are compared with theoretical predictions based on relativistic multi-scattering model. The dp breakup data are obtained with the detection of two outgoing protons at the angles of (19 • -54 • ) in laboratory frame at the deuteron energies from 0.3 to 0.5 GeV in various detector configurations. One of the tools to study spin structure of short range correlations is the measurements of the cross section, tensor analyzing power T 20 and spin correlation parameter C y,y in the d

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Study of the quasi-freenp→npπ+π−reaction with a deuterium beam

Cited by 28 publications

References 54 publications

Examination of the nature of the ABC effect

Examination of the nature of the ABC effect

Analysis of the exclusive final state npe+e- in the quasi-free np reaction

Investigation of reactions using polarized and unpolarized deuteron beam at Nuclotron: current status and perspectives

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