by Virginia Greco. Published: 07 July 2017

The 2017 edition of the European Physical Society Conference on High Energy Physics (EPS-HEP) kicked off in Venice, Italy, on July the 5th  and will last until the 12th. Being one of the major international conferences in this field, organized every second year since 1971, it is an important appointment for all the researchers working in the LHC experiments at CERN.

The ALICE Collaboration is presenting several new results, spread over 21 talks in parallel sessions and two in plenary ones. These measurements are mostly based on data collected in the ongoing "LHC Run 2”, with proton-proton collisions at 13 TeV and p-Pb and Pb-Pb collisions at 5 TeV centre-of-mass energy per nucleon pair.

Among the many highlights, it is certainly worth mentioning the new results about the production in Pb-Pb collisions of particles called hyperons, which contain strange quarks, and particles containing the heavier charm quarks. These measurements provide information on the energy loss of heavy quarks propagating through the QGP and on the temperature and freeze-out properties of this state of matter. Heavy-ion collisions also produce exotic nuclear matter, such as the hypertriton, a particle composed of a proton, a neutron and a Lambda, for which ALICE now provides one of the most accurate lifetime measurements.

New results on the production of charmed particles in p-Pb collisions, which will be shown at the conference, suggest that in these smaller collision systems - as in the Pb-Pb case - the density may be large enough to produce a pressure-driven transverse expansion that is felt by the heavy charm quarks.

The status of the upgrade of the detectors, which will take place in 2019 and 2020 for data taking starting in 2021, will also be discussed. The new experimental setup will enable ALICE to inspect and record 10 times to 100 times more collisions (depending on the observable) and provide improved spatial precision for measurements of short-lived decaying particles containing charm quarks.

 

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