Inclusive dielectron spectra in p plus p collisions at 3.5 GeV kinetic beam energy

0384750 - ÚJF 2013 RIV DE eng J - Článek v odborném periodiku
Agakishiev, G. - Balanda, A. - Belyaev, A. - Finocchiaro, P. - Guber, F. - Karavicheva, T. - Krása, Antonín - Křížek, Filip - Kugler, Andrej - Lapidus, K. - Markert, J. - Michel, J. - Pechenova, O. - Rustamov, A. - Sobolev, Yuri, G. - Strobele, H. - Tarantola, A. - Teilab, K. - Tlustý, Pavel - Wagner, Vladimír … celkem 103 autorů
Inclusive dielectron spectra in p plus p collisions at 3.5 GeV kinetic beam energy.
European Physical Journal A. Roč. 48, č. 5 (2012), s. 1-11. ISSN 1434-6001. E-ISSN 1434-601X
Grant CEP: GA MŠMT LC07050; GA AV ČR IAA100480803
Institucionální podpora: RVO:61389005
Klíčová slova: relativistic collisions * nuclear matter * dielectron spectra * HADES
Kód oboru RIV: BG - Jaderná, atomová a mol. fyzika, urychlovače
Impakt faktor: 2.043, rok: 2012

We present the inclusive invariant mass, transverse momentum and rapidity distributions of dielectrons (e(+)e(-) pairs) in p+p interactions at 3.5 GeV beam kinetic energy. In the vector meson mass region, a distinct peak corresponding to direct omega decays is reconstructed with a 2% mass resolution. The data is compared to predictions from three model calculations. Due to the large acceptance of the HADES apparatus for e(+)e(-) invariant masses above 0.2 GeV/c(2) and for transverse pair momenta p(t) < 1 GeV/c, acceptance corrections are, to a large extent, model independent. This allows us to extract from dielectron data for the first time at this energy the inclusive production cross-sections for light vector mesons. Inclusive production cross-sections for pi(0) and eta mesons are also reported. The obtained results will serve as an important reference for the study of vector meson production in proton-nucleus and heavy-ion collisions. Furthermore, using this data, an improved value for the upper bound of the branching ratio for direct eta decays into the electron-positron channel is obtained.
Trvalý link: http://hdl.handle.net/11104/0216993