First Observation of an Attractive Interaction between a Proton and a Cascade Baryon
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Zurlo, N. and A Large Ion Collider Expt Collabor... Show more Show less
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Abstract
This Letter presents the first experimental observation of the
attractive strong interaction between a proton and a multistrange baryon
(hyperon) Xi(-). The result is extracted from two-particle correlations
of combined p-Xi(-) circle plus (p) over bar-(Xi) over bar (+) pairs
measured in p-Pb collisions at root S-NN = 5.02 TeV at the LHC with
ALICE. The measured correlation function is compared with the prediction
obtained assuming only an attractive Coulomb interaction and a standard
deviation in the range {[}3.6, 5.3] is found. Since the measured
p-Xi(-)circle plus(p) over bar-(Xi) over bar (+) correlation is
significantly enhanced with respect to the Coulomb prediction, the
presence of an additional, strong, attractive interaction is evident.
The data are compatible with recent lattice calculations by the HAL-QCD
Collaboration, with a standard deviation in the range {[}1.8, 3.7]. The
lattice potential predicts a shallow repulsive Xi(-). interaction within
pure neutron matter and this implies stiffer equations of state for
neutron-rich matter including hyperons. Implications of the strong
interaction for the modeling of neutron stars are discussed.... Show more Show less