Baryonic resonances close to the Kbar-N threshold: the case of Lambda(1405) in pp collisions

G. Agakishiev , A. Balanda , D. Belver , A.V. 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 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. Kornakov R. Kotte A. Kr\'asa F. Krizek R. Kr\"ucken H. Kuc W. K\"uhn A. Kugler A. Kurepin V. Ladygin R. Lalik S. Lang K. Lapidus A. Lebedev T. Liu L. Lopes M. Lorenz L. Maier A. Mangiarotti J. Markert V. Metag B. Michalska J. Michel C. M\"untz 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 S. Spataro B. Spruck H. Str\"obele J. Stroth C. Sturm A. Tarantola K. Teilab P. Tlusty M. Traxler R. Trebacz H. Tsertos T. Vasiliev V. Wagner M. Weber C. Wendisch J. W\"ustenfel S. Yurevich Y.V. Zanevsky

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keywords lambdasigmaanalysiscollisionsproducedacceptance-correctedanglebaryonic

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We present an analysis of the Lambda(1405) resonance produced in the reaction p+p->Sigma^{pm}+pi^{mp}+K+p at 3.5 GeV kinetic beam energy measured with HADES at GSI. The two charged decay channels Lambda(1405) -> Sigma^{\pm}+pi^{\mp} have been reconstructed for the first time in p+p collisions. The efficiency and acceptance-corrected spectral shapes show a peak position clearly below 1400 MeV/c^2. We find a total production cross section of sigma_{Lambda(1405)}=9.2 +- 0.9 +- 0.7 +3.3-1.0 mub. The analysis of its polar angle distribution suggests that the Lambda(1405) is produced isotropically in the p-p center of mass system.

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Baryonic resonances close to the Kbar-N threshold: the case of Lambda(1405) in pp collisions

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