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

doi:10.1140/epja/i2012-12064-y

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

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

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punktacja MNiSW [2012 A]: 25

title:	Inclusive dielectron spectra in p+p collisions at 3.5 GeV kinetic beam energy
author:	Agakishiev G., Bałanda Andrzej , Belver D., Belyaev A., Blanco A., Böhmer M., Boyard J. L., Cabanelas P., Castro E., Chen J. C., Chernenko S., Christ T., Destefanis M., Dohrmann F., Dybczak Adrian , Epple E., Fabbietti L., Fateev O., Finocchiaro P., Fonte P., Friese J., Fröhlich I., Galatyuk T., Garzón J. A., Gernhäuser R., Gilardi C., Golubeva M., González-Díaz D., Guber F., Gumberidze M., Heinz T., Hennino T., Holzmann R., Ierusalimov A., Iori I., Ivashkin A., Jurkovic M., Kämpfer B., Kanaki K., Karavicheva T., Koenig I., Koenig W., Kolb B. W., Kotte R., Krása A., Krizek F., Krücken R., Kuc Hubert , Kühn W., Kugler A., Kurepin A., Lalik R., Lang S., Lange J. S., Lapidus K., Liu T., Lopes L., Lorenz M., Maier L., Mangiarotti A., Markert J., Metag V., Michalska Beata , Michel J., Morinière E., Mousa J., Müntz C., Naumann L., Otwinowski Jacek, Pachmayer Y. C., Pałka Marek , Parpottas Y., Pechenov V., Pechenova O., Pietraszko J., Przygoda Witold , Ramstein B., Reshetin A., Rustamov A., Sadovsky A., Salabura Piotr , Schmah A., Schwab E., Siebenson J., Sobolev Yu. G., Spataro S., Spruck B., Ströbele H., Stroth J., Sturm C., Tarantola A., Teilab K., Tlusty P., Traxler M., Trębacz Radosław, Tsertos H., Wagner V., Weber M., Wendisch C., Wüstenfeld J., Yurevich S., Zanevsky Y.
institution:	HADES Collaboration
journal title:	The European Physical Journal. A, Hadrons and Nuclei
volume:	48
issue:	5
date of publication :	2012
article ID:	64
ISSN:	1434-6001
eISSN:	1434-601X
DOI:	10.1140/epja/i2012-12064-y
language:	English
journal language:	English
abstract in English:	We present the inclusive invariant mass, transverse momentum and rapidity distributions of dielectrons ($e^{+}e^{-}$ pairs) in p+p interactions at 3.5GeV 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 $\pi^{\circ}$ 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.
number of pulisher's sheets:	0,7
affiliation:	Wydział Fizyki, Astronomii i Informatyki Stosowanej : Instytut Fizyki im. Mariana Smoluchowskiego
type:	journal article
subtype:	academic paper