Jul 6 – 13, 2022
Bologna, Italy
Europe/Rome timezone

Extending the ALICE strong-interaction studies to nuclei: measurement of proton-deuteron and $\Lambda$-deuteron correlations in pp collisions at $\sqrt{s}$ = 13 TeV

Jul 9, 2022, 5:30 PM
Room 1 (Europa Auditorium)

Room 1 (Europa Auditorium)

Parallel Talk Strong interactions and Hadron Physics Strong interactions and Hadron Physics


Bhawani Singh (Technical University of Munich)


In the journey to explore the strong interaction among hadrons, ALICE has for the first time flared out its femtoscopic studies to nuclei. The large data sample of high-multiplicity pp collisions at $\sqrt{s}$ = 13 TeV allows the measurement of the proton-deuteron (p-d) and the hyperon-deuteron ($\Lambda$-d) momentum correlations. The femtoscopic study of these systems opens the door to investigate the formation mechanism of the light nuclei in hadron-hadron collisions.

In this contribution, the measured correlation functions for p-d and $\Lambda$-d are presented and compared to theoretical predictions. In the case of p-d correlations, the data show a shallow depletion at low relative momenta, while the full-fledged model calculations which include all relevant interactions predict a strong repulsive signal. Possible explanations include a late formation of the deuterons leading to the suppression of strong interactions between protons and deuterons. In addition, the
measured $\Lambda$-d correlation is in agreement with hypothesis of no strong interaction due to the late formation of deuterons, supporting the findings in p-d. In general, we demonstrate how correlation functions can be exploited to study the production mechanism of light nuclei at the LHC.

In-person participation Yes

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