Bulletin of the American Physical Society
APS April Meeting 2019
Volume 64, Number 3
Saturday–Tuesday, April 13–16, 2019; Denver, Colorado
Session T10: Collider and BSM IV
3:30 PM–5:18 PM,
Monday, April 15, 2019
Sheraton
Room: Governor's Square 12
Sponsoring
Unit:
DPF
Chair: Jeremy Love, Argonne National Laboratory
Abstract: T10.00002 : Using Ξ(1820) baryons to test for parity doubling at ALICE*
3:42 PM–3:54 PM
View Presentation Abstract
Presenter:
Corey James Myers
(University of Houston)
Author:
Corey James Myers
(University of Houston)
Collaboration:
Corey Myers for the ALICE collaboration.
We investigate the production of Ξ(1820) baryons in pp collisions at 13 TeV by reconstructing their Λ-Κ decays. Recent lattice calculations on parity doubling indicate that the masses of negative-parity particles, such as Ξ(1820), may decrease at high temperatures, 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 Λ(1520), K*(892), and ρ(770). Studying Ξ(1820) also allows us to better understand the spectrum of excited hyperon states, with implications for our understanding of the hadron resonance gas. Using ALICE data from 2015-2018, we have reconstructed the Ξ(1820) and measured its mass, width, and yield as functions of transverse momentum and collision multiplicity. The mass and width measurements are in general agreement with previous measurements, but could indicate a slight increase in the width as a function of charged particle multiplicity. These pp studies will inform future studies of the Ξ(1820) in p-Pb and Pb-Pb collisions.
*This work is supported by the U.S. Department of Energy under Contract No. DEFG02- 07ER41521.
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