Dresden 2013 – scientific programme
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HK: Fachverband Physik der Hadronen und Kerne
HK 62: Schwerionenkollisionen und QCD Phasen
HK 62.1: Group Report
Thursday, March 7, 2013, 14:00–14:30, HSZ-201
(Anti-)matter and hyper-matter production at the LHC with ALICE — •Nicole Martin — Research Division and ExtreMe Matter Institute EMMI, GSI Helmholtzzentrum für Schwerionenforschung, Darmstadt, Germany — TU Darmstadt, Institut für Kernphysik, Darmstadt, Germany
ALICE is the experiment at the CERN LHC dedicated to the investigation of nucleus–nucleus collisions at the highest energies ever reached in the laboratory. The excellent particle identification capabilities and the ultralow momentum reach of ALICE allow for the reconstruction of a significant number of rare states or even exotic ones. In this talk we present results from a sample of Pb–Pb collisions at a center of mass energy of √sNN = 2.76 TeV per nucleon–nucleon pair. Light nuclei up to 3He and 4He as well as the corresponding anti-nuclei have been identified based on their specific energy loss in the Time Projection Chamber and velocity information from the Time-Of-Flight detector. (Anti-)hyper-tritons have been reconstructed via their mesonic decay channel (Λ3H→ 3He+π) exploiting their secondary vertex decay topology. The (3He, π) invariant mass spectrum are presented. In addition, searches for even lighter exotic hyper-matter states, i.e. Λ-Λ (also known as H-Dibaryon) and Λ-n bound states, are discussed. The results are compared with model expectations.