Study of exclusive one-pion and one-eta production using hadron and dielectron channels in pp reactions at kinetic beam energies of 1.25 GeV and 2.2 GeV with HADES

0384721 - ÚJF 2013 RIV DE eng J - Článek v odborném periodiku
Agakishiev, G. - Balanda, A. - Bokemeyer, H. - Finocchiaro, P. - Guber, F. - Gumberidze, M. - Karavicheva, T. - Křížek, Filip - Kugler, Andrej - Markert, J. - Pachmayer, Y.C. - Pechenova, O. - Pospíšil, Vladimír - Rustamov, A. - Sobolev, Yuri, G. - Strobele, H. - Tarantola, A. - Teilab, K. - Tlustý, Pavel - Wagner, Vladimír … celkem 95 autorů
Study of exclusive one-pion and one-eta production using hadron and dielectron channels in pp reactions at kinetic beam energies of 1.25 GeV and 2.2 GeV with HADES.
European Physical Journal A. Roč. 48, č. 5 (2012), s. 1-17. ISSN 1434-6001. E-ISSN 1434-601X
Grant CEP: GA MŠMT LC07050; GA AV ČR IAA100480803
Institucionální podpora: RVO:61389005
Klíčová slova: meson production * relativistic collision * dilepton production
Kód oboru RIV: BG - Jaderná, atomová a mol. fyzika, urychlovače
Impakt faktor: 2.043, rok: 2012

We present measurements of exclusive pi(+,0) and eta production in pp reactions at 1.25 GeV and 2.2 GeV beam kinetic energy in hadron and dielectron channels. In the case of pi(+) and pi(0), high-statistics invariant-mass and angular distributions are obtained within the HADES acceptance as well as acceptance-corrected distributions, which are compared to a resonance model. The sensitivity of the data to the yield and production angular distribution of Delta(1232) and higher-lying baryon resonances is shown, and an improved parameterization is proposed. The extracted cross-sections are of special interest in the case of pp -> pp eta, since controversial data exist at 2.0 GeV; we find sigma = 0.142 +/- 0.022 mb. Using the dielectron channels, the pi(0) and eta Dalitz decay signals are reconstructed with yields fully consistent with the hadronic channels. The electron invariant masses and acceptance-corrected helicity angle distributions are found in good agreement with model predictions.
Trvalý link: http://hdl.handle.net/11104/0216995