Bonn 2020 – wissenschaftliches Programm
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HK 33.1: Gruppenbericht
Mittwoch, 1. April 2020, 16:30–17:00, J-HS A
ALICE: A new Laboratory to Investigate and Constrain Exotic hadron-hadron interactions — •Dimitar Mihaylov for the ALICE collaboration — Technische Universität München, James-Franck-Straße, 85748, Garching, Germany
The study of baryon-hyperon interactions is essential for understanding the Equation of State of dense objects like neutron stars. Recent results from lattice calculations, based on fundamental QCD principles, provide theoretical predictions for an attractive interaction between p−Ξ− and p−Ω−, and a hint that the latter could form a bound state. At the moment all experimental attempts to study these predictions were inconclusive.
Pioneering studies by the ALICE collaboration demonstrated the potential of employing femtoscopy to investigate and constrain baryon-baryon interactions with unprecedented precision, thus providing a unique opportunity to study exotic baryon-hyperon pairs. In this contribution we present the latest ALICE results on p−Λ, p−Σ0, p−Ξ− and p−Ω− interactions, based on the analysis of high-multiplicity pp collisions at √s=13 TeV. To achieve the required precision, a novel procedure to model the emission source of all baryons, based on the explicit correction for the effect of short lived resonances, was developed. The p−Λ correlation provides new constraints to theoretical models, in particular related to the effects of the coupling to N−Σ. In the multi-strangeness sector, the p−Ξ− and p−Ω− interactions are confirmed to be attractive. The possible existence of a bound state in the p−Ω− system will be discussed in detail.