Measurement of the pn→ppπ0π− reaction in search for the recently observed resonance structure in dπ0π0 and dπ+π− systems

Medientyp: E-Artikel

Titel: Measurement of the pn→ppπ0π− reaction in search for the recently observed resonance structure in dπ0π0 and dπ+π− systems

Beteiligte: Adlarson, P. [VerfasserIn]; Augustyniak, W. [VerfasserIn]; Clement, H. [VerfasserIn]; Wolke, M. [VerfasserIn]; Wrońska, A. [VerfasserIn]; Wüstner, P. [VerfasserIn]; Wurm, P. [VerfasserIn]; Yamamoto, A. [VerfasserIn]; Yuan, X. [VerfasserIn]; Zabierowski, J. [VerfasserIn]; Zheng, C. [VerfasserIn]; Zieliński, M. J. [VerfasserIn]; Zipper, W. [VerfasserIn]; Coderre, D. [VerfasserIn]; Złomańczuk, J. [VerfasserIn]; Żuprański, P. [VerfasserIn]; Żurek, M. [VerfasserIn]; Czerwiński, E. [VerfasserIn]; Demmich, K. [VerfasserIn]; Doroshkevich, E. [VerfasserIn]; Engels, R. [VerfasserIn]; Erven, W. [VerfasserIn]; Eyrich, W. [VerfasserIn]; Fedorets, P. [VerfasserIn]; [...]

Erschienen: Inst., 2013

Sprache: Englisch

DOI: https://doi.org/10.1103/PhysRevC.88.055208

ISSN: 0556-2813; 1089-490X

Schlagwörter: threshold ; numerical calculations ; differential cross section: momentum transfer ; amplitude analysis ; photon: polarized beam ; photon nucleon --> N(1440) omega(783) ; N(1440): photoproduction ; photon nucleon: exclusive reaction ; effective Lagrangian ; omega(783): associated production ; spin: asymmetry

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Beschreibung: Associative photoproduction of $\omega$-meson and $N^{*}(1440)$ on nucleons, $\gamma+N\to\omega+N^{*}(1440)$, in the near threshold region is investigated in a framework employing effective Lagrangians. Besides $\pi$-exchange in t-channel, baryon exchanges, i.e. N- and $N^{*}$-exchanges, in the s- and u-channels are also taken into account in calculations of differential cross-section and beam asymmetry. Important inputs of this model are the vector and tensor coupling constants of $\omega NN^{*}(1440)$-vertex, which are assumed to be equal to the values of these couplings for $\omega NN$ vertex. Using our previous estimation of $\omega NN$ coupling constants obtained from a fit to available experimental data on photoproduction of $\omega$ meson in the near threshold region, we produce the necessary numerical predictions for different observables in $\gamma+N\to\omega+N^{*}(1440)$. Numerical results shows that at low $|$t$|$ dominant contribution comes from t-channel $\pi$-exchange while effects of nucleon and $N^{*}(1440)$ pole terms can be seen at large $|t|$. Our predictions for the differential cross section and beam asymmetry for the processes $\gamma+N\to\omega+N^{*}(1440)$, where N is proton and neutron at $E_{\gamma}=2.5$ GeV are presented with zero width approximation and also with the inclusion of width effects of $N^{*}(1440)$.

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