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Etaprime interactions with nucleons and nuclei  [PDF]
Steven D. Bass,Pawel Moskal
Physics , 2015,
Abstract: We summarise recent progress in theory and experiment towards understanding etaprime meson interactions with nucleons and nuclei. Highlights include the production mechanism of etaprime mesons in proton-proton collisions close to threshold, the etaprime effective mass shift in nuclei and the determination of the etaprime-nucleon scattering length in free space.
Partonic substructure of nucleons and nuclei with dimuon production  [PDF]
Jen-Chieh Peng
Physics , 2010, DOI: 10.1063/1.3479363
Abstract: Dimuon production has been studied in a series of fixed-target experiments at Fermilab during the last two decades. Highlights from these experiments, together with recent results from the Fermilab E866 experiment, are presented. Future prospects for studying the parton distributions in the nucleons and nuclei using dimuon production are also discussed.
Strangeness Electromagnetic Production on Nucleons and Nuclei  [PDF]
Petr Bydzovsky,Miloslav Sotona
Physics , 2009, DOI: 10.1016/j.nuclphysa.2010.01.199
Abstract: Isobar models for the electromagnetic production of kaons are discussed with emphasis on the K^+ photoproduction at very small kaon angles and K^0 photoproduction on deuteron. Distorted-wave impuls approximation calculations of the cross sections for the electroproduction of hypernuclei are presented on the case of the ^{12}B_\Lambda production.
Subthreshold $K^+$ Production on Nuclei by $π^+$ Mesons  [PDF]
S. V. Efremov,E. Ya. Paryev
Physics , 1995,
Abstract: The inclusive $K^+$ mesons production in $\pi^+$--nucleus reactions in the subthreshold energy regime is analyzed with respect to the one--step ($\pi^+n\to K^+\Lambda$) and the two--step ($\pi^+n\to \eta p_1,~ \eta p_2\to K^+\Lambda$) incoherent production processes on the basis of an appropriate folding model, which allows one to take into account the various forms of an internal nucleon momentum distribution as well as on-- and off--shell propagation of the struck target nucleon. Contrary to proton--nucleus reactions primary reaction channel is found to be significant practically at all considered energies. Detailed predictions for the $K^+$ total and invariant differential cross sections from \piC-- and \piPb--collisions at subthreshold energies are provided.
Production of Eta-Mesons in Collisions of Nucleons and Delta-Resonances  [PDF]
W. Peters,U. Mosel,A. Engel
Physics , 1994, DOI: 10.1007/BF01292339
Abstract: We calculate the cross section for the production of $\eta$-mesons via \mbox{$\Delta N \to N N \eta$} in a relativistic One-Boson-Exchange-Model. Using this cross section we then determine the probability for the production of an $\eta$-meson by a $\Delta$-resonance moving in nuclear matter. The result is compared to prescriptions in BUU-calculations in which \et-production proceeds both through a direct channel and through the sequential process $\Delta \to N \pi ; \pi N \to N \eta$.
Production of Polarized Vector Mesons off Nuclei
Kopeliovich, B. Z.;Nemchik, J.;Schmidt, Ivan
High Energy Physics - Phenomenology , 2007, DOI: 10.1103/PhysRevC.76.025210
Abstract: Using the light-cone QCD dipole formalism we investigate manifestations of color transparency (CT) and coherence length (CL) effects in electroproduction of longitudinally (L) and transversally (T) polarized vector mesons. Motivated by forthcoming data from the HERMES experiment we predict both the A and Q^2 dependence of the L/T- ratios, for rho^0 mesons produced coherently and incoherently off nuclei. For an incoherent reaction the CT and CL effects add up and result in a monotonic A dependence of the L/T-ratio at different values of Q^2. On the contrary, for a coherent process the contraction of the CL with Q^2 causes an effect opposite to that of CT and we expect quite a nontrivial A dependence, especially at Q^2 >> m_V^2.
Photoproduction of $ω$ mesons on nuclei near the production threshold  [PDF]
M. Nanova,J. Weil,S. Friedrich,V. Metag,U. Mosel,G. Anton,J. C. S. Bacelar,O. Bartholomy,D. Bayadilov,Y. A. Beloglazov,R. Bogend?rfer,R. Castelijns,V. Crede,H. Dutz,A. Ehmanns,D. Elsner,K. Essig,R. Ewald,I. Fabry,M. Fuchs,Ch. Funke,R. Gothe,R. Gregor,A. B. Gridnev,E. Gutz,S. H?ffgen,P. Hoffmeister,I. Horn,J. H?ssl,I. Jaegle,J. Junkersfeld,H. Kalinowsky,Frank Klein,Friedrich Klein,E. Klempt,M. Konrad,B. Kopf,M. Kotulla,B. Krusche,J. Langheinrich,H. L?hner,I. V. Lopatin,J. Lotz,S. Lugert,D. Menze,T. Mertens,J. G. Messchendorp,C. Morales,R. Novotny,M. Ostrick,L. M. Pant,H. van Pee,M. Pfeiffer,A. Roy,A. Radkov,S. Schadmand,Ch. Schmidt,H. Schmieden,B. Schoch,S. Shende,G. Suft,A. Süle,V. V. Sumachev,T. Szczepanek,U. Thoma,D. Trnka,R. Varma,D. Walther,Ch. Weinheimer,Ch. Wendel
Physics , 2010, DOI: 10.1140/epja/i2011-11016-5
Abstract: The photoproduction of $\omega$ mesons on LH_2, C and Nb has been studied for incident photon energies from 900 to 1300 MeV using the CB/TAPS detector at ELSA. The $\omega$ line shape does not show any significant difference between the LH_2 and the Nb targets. The data are compared with results of transport calculations that predict a sensitivity of the $\omega$ line shape to in-medium modifications near the production threshold on a free nucleon of $E_{\gamma}^{lab}$ = 1109 MeV.}
Eta and eta' mesons production at COSY-11  [PDF]
P. Moskal,H. -H. Adam,A. Budzanowski,E. Czerwinski,R. Czyzykiewicz,D. Gil,D. Grzonka,M. Janusz,L. Jarczyk,B. Kamys,A. Khoukaz,P. Klaja,J. Majewski,W. Oelert,C. Piskor-Ignatowicz,J. Przerwa,J. Ritman,B. Rejdych,T. Rozek,T. Sefzick,M. Siemaszko,J. Smyrski,A. Taeschner,P. Winter,M. Wolke,P. Wuestner,W. Zipper
Physics , 2006, DOI: 10.1142/S0217751X07035471
Abstract: The low emittance and small momentum spread of the proton and deuteron beams of the Cooler Synchrotron COSY combined with the high mass resolution of the COSY-11 detection system permit to study the creation of mesons in the nucleon-nucleon interaction down to the fraction of MeV with respect to the kinematical threshold. At such small excess energies, the ejectiles possess low relative momenta and are predominantly produced with the relative angular momentum equal to zero. Taking advantage of these conditions we have performed investigations aiming to determine the mechanism of the production of eta and eta' mesons in the collision of hadrons as well as the hadronic interaction of these mesons with nucleons and nuclei. In this proceedings we address the ongoing studies of the spin and isospin dependence for the production of the eta and eta' mesons in free and quasi-free nucleon-nucleon collisions. New results on the spin observables for the vec(p)p --> pp eta reaction, combined with the previously determined total cross section isospin dependence, reveal a statistically significant indication that the excitation of the nucleon to the S11(1535) resonance, the process which intermediates the production of the eta meson in the nucleon-nucleon interactions, is predominantly due to the exchange of the pi meson between the colliding nucleons.
Microscopics of meson degrees of freedom in nucleons and mesons in nuclei - what can be seen in the process of quasielastic knockout of mesons by high-energy electrons  [PDF]
V. G. Neudatchin,I. T. Obukhovsky,L. L. Sviridova,N. P. Yudin
Physics , 2002, DOI: 10.1134/1.1690052
Abstract: Developed earlier concept of quasielastic knock out of pions from nucleons by high-energy electrons is propounded as a tool for checking microscopical model ($^3P_0$ - fluctuation) for decay of N to different channels $\pi+B$ and Preparata model of nucleus structure.
Mesons and the Structure of Nucleons  [PDF]
W. Koepf,E. M. Henley,M. Alberg
Physics , 1994,
Abstract: The role of mesons, particularly the pion, in the structure of nucleons is reviewed and investigated. Since quark-antiquark pairs are likely to ``transform" into mesons at large distances, mesons are expected to contribute to nucleon structure. Their effects on the Gottfried sum rule, on the strangeness content of the nucleon, and on the spin of the nucleon are discussed.
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