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Unveiling the strong interaction among hadrons at the LHC
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Journal Article
Unveiling the strong interaction among hadrons at the LHC
2020
Overview
One of the key challenges for nuclear physics today is to understand from first principles the effective interaction between hadrons with different quark content. First successes have been achieved using techniques that solve the dynamics of quarks and gluons on discrete space-time lattices
1
,
2
. Experimentally, the dynamics of the strong interaction have been studied by scattering hadrons off each other. Such scattering experiments are difficult or impossible for unstable hadrons
3
–
6
and so high-quality measurements exist only for hadrons containing up and down quarks
7
. Here we demonstrate that measuring correlations in the momentum space between hadron pairs
8
–
12
produced in ultrarelativistic proton–proton collisions at the CERN Large Hadron Collider (LHC) provides a precise method with which to obtain the missing information on the interaction dynamics between any pair of unstable hadrons. Specifically, we discuss the case of the interaction of baryons containing strange quarks (hyperons). We demonstrate how, using precision measurements of proton–omega baryon correlations, the effect of the strong interaction for this hadron–hadron pair can be studied with precision similar to, and compared with, predictions from lattice calculations
13
,
14
. The large number of hyperons identified in proton–proton collisions at the LHC, together with accurate modelling
15
of the small (approximately one femtometre) inter-particle distance and exact predictions for the correlation functions, enables a detailed determination of the short-range part of the nucleon-hyperon interaction.
Correlations in momentum space between hadrons created by ultrarelativistic proton–proton collisions at the CERN Large Hadron Collider provide insights into the strong interaction, particularly the short-range dynamics of hyperons—baryons that contain strange quarks.
Publisher
Nature Publishing Group UK,Nature Publishing Group
