Measurement of the production of light (anti-)nuclei with ALICE at the LHC.

Pinto C. per la Collaborazione ALICE

I - Fisica nucleare e subnucleare
Aula Palazzo dell'Emiciclo - Sala Ipogea - Lunedì 23 h 15:00 - 19:00
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The ALICE experiment at the LHC has excellent tracking and particle identification capabilities over a broad momentum range. This makes ALICE the detector at the LHC most suited to study light (anti-)nuclei produced in high energy hadronic collisions. (Anti-)nuclei with mass numbers up to $A=4$, such as (anti-)deuterons, (anti-)tritons, (anti-)${}^{3}He$ and (anti-)${}^{4}He$ have been successfully identified in ALICE in the pseudorapidity region $|\eta <0.9$ using different experimental techniques and different detectors, namely the Inner Tracking System (ITS), the Time Projection Chamber (TPC) and the Time-of-Flight (TOF) detector. The measurement of (anti-)nuclei production is important to understand the hadronization process. Results on the transverse momentum distributions will be presented together with a comparison with the two phenomenological predictions currently available: the thermal-statistical and the coalescence models. The anti-nuclei/nuclei ratios will be also shown: such ratios are expected to be compatible with unity due to the baryo-chemical potential, close to zero at the LHC. Furthermore, the difference in mass-to-charge ratio between nuclei and anti-nuclei will be discussed as a test of the $CPT$ invariance.

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