Münster 2017 – scientific programme
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HK: Fachverband Physik der Hadronen und Kerne
HK 2: Heavy Ion Collisions and QCD Phases I
HK 2.8: Talk
Monday, March 27, 2017, 18:45–19:00, F 1
Feasibility Studies on a Nuclei Trigger using the ALICE-TRD — •Benjamin Brudnyj — Institut für Kernphysik, Goethe-Universität Frankfurt, Frankfurt am Main
At the Large Hadron Collider (LHC) at CERN significant production rates of light (anti-)(hyper-)nuclei have been measured in Pb–Pb collisions. The production of such nuclei has recently become a topic of high interest. For instance the measured lifetime of the lightest hypernucleus, the hypertriton (a bound state of a proton, a neutron and a Λ hyperon), is significantly below the expectation of state-of-the-art theory calculations which expect the lifetime to be very close to the Λ lifetime. Therefore, it is important to also measure these rare nuclei in p–p collisions.
Due to their short lifetime, only its decay products can be measured, e.g. the charged two body decay channel Λ3H →3He + π−. In order to be able to measure these rare (anti-)fragments also in p–p and p–Pb collisions, it is essential to increase the statistics by employing a trigger on nuclei. Using the data on Pb–Pb collisions at √sNN = 2.76 TeV it turned out that particles with Z > 1 in the TRD show a behavior that can be used to implement such a nuclei trigger.
In this talk the physics case of a nuclei trigger will be elaborated as well as the exctracted efficiencies and purities for the different light nuclei, i.e. (anti-)d, (anti-)t, (anti-)3He and (anti-)4He.