Mainz 2012 – scientific programme

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HK: Fachverband Physik der Hadronen und Kerne

HK 16: Hadronenstruktur und -spektroskopie

HK 16.5: Talk

Tuesday, March 20, 2012, 17:45–18:00, RW 2

Measurement Of The Baryonic Λ(1520) Resonance With The ALICE Apparatus At The LHC — •Benjamin Dönigus — Research Division and ExtreMe Matter Institute EMMI, GSI Helmholtzzentrum für Schwerionenforschung, Darmstadt, Germany — Helmholtz Research School H-QM, Frankfurt, Germany

The measurement of resonances can help significantly in disentangling the different phases of the fireball evolution in heavy-ion collisions. Due to their lifetimes of the order of the fireball lifetime (the lifetime of the Λ(1520) is 12.6 fm/c) they can be used as probes for the phase between the chemical and the kinetic freeze-out where rescattering and re-generation can change the observed particle yields [1,2]. To test this and to compare to the up to now very successful description of hadron abundances within the statistical model (for example [3]) we will study resonance to stable particle ratios, e.g. Λ(1520)/Λ. For this we use the transverse momentum spectrum of the Λ(1520) in 7 TeV proton-proton collsions as it will be presented here. This study will be used as a baseline for the analysis of heavy-ion data. Further we discuss the latest results on the H-Dibaryon, the postulated bound state of two Λ hyperons [4].

[1] G. Torrieri and J. Rafelski, J. Phys. G 28, 1911 (2002)

[2] M. Bleicher and J. Aichelin, Phys. Lett. B 530, 81 (2002)

[3] A. Andronic, P. Braun-Munzinger, J. Stachel, Phys. Lett. B 673, 142 (2009);
Erratum-ibid. B 678, 516 (2009); arXiv:0812.1186

[4] R.L. Jaffe, Phys. Rev. Lett. 38, 195 (1977)