Search for exotic hyper-matter and measurement of nuclei with ALICE at the LHC

14th International Conference on Strangeness in Quark Matter

Donigus, Benjamin^1

Institut für Kernphysik, Goethe-Univeristät Frankfurt, Max-von-Laue-Str. 1, 60438 Frankfurt am Main, Germany^1

关键词: Coalescence modeling;    Collision energies;    Inner tracking system;    Production yield;    Thermal model;    Time of flight measurements;    Time projection chambers;    Upper limits;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/509/1/012109/pdf
DOI  :  10.1088/1742-6596/509/1/012109

来源: IOP

【 摘 要 】

The high collision energies reached at the LHC lead to signiffcant production yields of light (anti)-nuclei and hyper-matter in proton-proton and, in particular, Pb{Pb collisions. The excellent particle identiffcation capabilities of the ALICE apparatus, in particular the speciffc energy loss in the Time Projection Chamber (TPC) and Time-of-Flight (TOF) measurement, allow for the detection of such rarely produced particles. Further, the Inner Tracking System (ITS) gives the possibility to separate primary nuclei from those coming from the weak decay of heavier systems. This offers the unique opportunity to search for exotica like the bound state of a and a neutron which would decay into deuteron and pion, or the bound states of two s. We show here the performance of the ALICE apparatus in the sector on (anti-)nuclei and in particular the results on deuteron production in Pb{Pb collisions atSNN = 2:76TeV. These are compared with thermal model predictions. We further present the current state of the searches, by their upper limits on the production yields, and compare the results to thermal and coalescence model expectations.