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Measurement of charged pions in 12C + 12C collisions at 1A GeV and 2A GeV with HADES

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arxiv 0902.4377 v2 pith:JKXXRE64 submitted 2009-02-25 nucl-ex

Measurement of charged pions in 12C + 12C collisions at 1A GeV and 2A GeV with HADES

The HADES Collaboration: G.Agakishiev , C.Agodi , A.Balanda , G.Bellia , D.Belver , A.Belyaev , J.Bielcik , A.Blanco
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A.Bortolotti J.L.Boyard P.Braun-Munzinger P.Cabanelas S.Chernenko T.Christ R.Coniglione M.Destefanis J.Diaz F.Dohrmann I.Duran A.Dybczak T.Eberl L.Fabbietti O.Fateev R.Ferreira-Marques P.Finocchiaro P.Fonte J.Friese I.Froehlich T.Galatyuk J.A.Garzon R.Gernhaeuser A.Gil C.Gilardi M.Golubeva D.Gonzalez-Diaz E.Grosse F.Guber M.Heilmann T.Heinz T.Hennino R.Holzmann A.Ierusalimov I.Iori A.Ivashkin M.Jurkovic B.Kaempfer K.Kanaki T.Karavicheva D.Kirschner I.Koenig W.Koenig B.W.Kolb R.Kotte A.Kozuch A.Krasa F.Krizek R.Kruecken W.Kuehn A.Kugler A.Kurepin J.Lamas-Valverde S.Lang J.S.Lange K.Lapidus L.Lopes M.Lorenz L.Maier C.Maiolino A.Mangiarotti J.Marin J.Markert V.Metag B.Michalska J.Michel E.Moriniere J.Mousa M.Muench C.Muentz L.Naumann R.Novotny J.Otwinowski Y.C.Pachmayer M.Palka Y.Parpottas V.Pechenov O.Pechenova T.Perez Cavalcanti P.Piattelli J.Pietraszko V.Pospisil W.Przygoda B.Ramstein A.Reshetin M.Roy-Stephan A.Rustamov A.Sadovsky B.Sailer P.Salabura P.Sapienza A.Schmah C.Schroeder E.Schwab R.S.Simon Yu.G.Sobolev S.Spataro B.Spruck H.Stroebele J.Stroth C.Sturm M.Sudol A.Tarantola K.Teilab P.Tlusty M.Traxler R.Trebacz H.Tsertos V.Wagner M.Weber M.Wisniowski T.Wojcik J.Wuestenfeld S.Yurevich Y.Zanevsky P.Zhou P.Zumbruch
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keywords chargedhadespionproductioncollisioncollisionsdatadielectron
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We present the results of a study of charged pion production in 12C + 12C collisions at incident beam energies of 1A GeV and 2A GeV using the HADES spectrometer at GSI. The main emphasis of the HADES program is on the dielectron signal from the early phase of the collision. Here, however, we discuss the data with respect to the emission of charged hadrons, specifically the production of pi+- mesons, which are related to neutral pions representing a dominant contribution to the dielectron yield. We have performed the first large-angular range measurement of the distribution of pi+- mesons for the 12C + 12C collision system covering a fairly large rapidity interval. The pion yields, transverse-mass and angular distributions are compared with calculations done within a transport model, as well as with existing data from other experiments. The anisotropy of pion production is systematically analyzed.

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