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HK: Fachverband Physik der Hadronen und Kerne
HK 19: Heavy-Ion Collisions and QCD Phases III
HK 19.6: Vortrag
Dienstag, 19. März 2019, 15:30–15:45, HS 15
Performance study of the TRD nuclei trigger — •Ömür Erkiner for the ALICE collaboration — Institut für Kernphysik, Goethe-Universität Frankfurt
At the Large Hadron Collider at CERN significant production rates of light (anti-)(hyper-)nuclei have been measured in Pb–Pb collisions. The production of such loosely bound objects 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 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 pp collisions.
Due to their weak decay, only its daughter products can be measured, e.g. the charged two body decay channel Λ3H → 3He + π−. Furthermore, anti-alpha have not been measured in pp and p–Pb collisions because of rare statistics and low production yield. In order to be able to measure these rare (anti-)nuclei also in pp collisions, it is essential to increase the statistics by employing a trigger on nuclei. The transition radiation detector (TRD) was constructed for electron identification and offers trigger capabilities. Using the data on pp collisions at √s = 13 TeV it turned out that particles with Z > 1 the TRD shows a good behaviour as a nuclei trigger.
In this talk the properties of the nuclei trigger will be elaborated as well as the extracted efficiencies and purities for the different light nuclei, i.e. (anti-)d, (anti-)t, (anti-)3He and (anti-)4He.
Supported by BMBF and the Helmholtz Association.