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K*(892)+ production in proton-proton collisions at E_beam = 3.5 GeV

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arxiv 1505.06184 v1 pith:YSY2KRZS submitted 2015-05-22 nucl-ex

K*(892)+ production in proton-proton collisions at E_beam = 3.5 GeV

HADES Collaboration: G. Agakishiev , O. Arnold , D. Belver , A. Belyaev , J. C. Berger-Chen , A. Blanco , M. B\"ohmer , J. L. Boyard
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P. Cabanelas S. Chernenko A. Dybczak E. Epple L. Fabbietti O. Fateev P. Finocchiaro P. Fonte J. Friese I. Fr\"ohlich T. Galatyuk J. A. Garz\'on R. Gernh\"auser K. G\"obel M. Golubeva D. Gonz\'alez-D\'iaz F. Guber M. Gumberidze T. Heinz T. Hennino R. Holzmann A. Ierusalimov I. Iori A. Ivashkin M. Jurkovic B. K\"ampfer T. Karavicheva I. Koenig W. Koenig B. W. Kolb G. Korcyl G. Kornakov R. Kotte A. Kr\'asa F. Krizek R. Kr\"ucken H. Kuc W. K\"uhn A. Kugler T. Kunz A. Kurepin V. Ladygin R. Lalik K. Lapidus A. Lebedev L. Lopes M. Lorenz L. Maier A. Mangiarotti J. Markert V. Metag J. Michel D. Mihaylov C. M\"untz R. M\"unzer L. Naumann Y. C. Pachmayer M. Palka Y. Parpottas V. Pechenov O. Pechenova J. Pietraszko W. Przygoda B. Ramstein A. Reshetin A. Rustamov A. Sadovsky P. Salabura A. Schmah E. Schwab J. Siebenson Yu. G. Sobolev S. Spataro B. Spruck H. Str\"obele J. Stroth C. Sturm O. Svoboda A. Tarantola K. Teilab P. Tlusty M. Traxler H. Tsertos T. Vasiliev V. Wagner M. Weber C. Wendisch J. W\"ustenfeld S. Yurevich Y. Zanevsky
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keywords productionenergybeamcollisionsdatamodelproton-protontwo-channel
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We present results on the K*(892)+ production in proton-proton collisions at a beam energy of E = 3.5 GeV, which is hitherto the lowest energy at which this mesonic resonance has been observed in nucleon-nucleon reactions. The data are interpreted within a two-channel model that includes the 3-body production of K*(892)+ associated with the Lambda- or Sigma-hyperon. The relative contributions of both channels are estimated. Besides the total cross section sigma(p+p -> K*(892)+ + X) = 9.5 +- 0.9 +1.1 -0.9 +- 0.7 mub, that adds a new data point to the excitation function of the K*(892)+ production in the region of low excess energy, transverse momenta and angular spectra are extracted and compared with the predictions of the two-channel model. The spin characteristics of K*(892)+ are discussed as well in terms of the spin-alignment.

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