[Poster] Using Ξ(1820) baryons to test for parity doubling at ALICE

4 Nov 2019, 17:40
Wanda Han Show Theatre & Wanda Reign Wuhan Hotel

Wanda Han Show Theatre & Wanda Reign Wuhan Hotel

Poster Presentation Small systems Poster Session


Corey James Myers (University of Houston (US))


We report the first measurement of the Ξ(1820) baryon at LHC energies by reconstructing its decay to Λ-Κ in pp collisions at 13 TeV. Recent lattice calculations on parity doubling indicate that the masses of negative-parity particles, such as Ξ(1820), may decrease at the critical temperature, while the masses of positive-parity partners, i.e. the Ξ(1530), do not. Furthermore, the lifetime of the Ξ(1820) is short enough that it may be suppressed in high-multiplicity collisions, as has been observed for K*(892) and ρ(770). Studying Ξ(1820) also allows us to gain a better understanding of the spectrum of excited hyperon states, with implications for our understanding of the hadron resonance gas. We have successfully reconstructed the Ξ(1820) using ALICE data from 2015-2018 and measured its mass, width, and yield as a function of the transverse momentum and collision multiplicity. These studies performed in small collision systems will serve as a baseline for future measurements of the Ξ(1820) in p-Pb and Pb-Pb collisions.

Primary author

Corey James Myers (University of Houston (US))

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