HEPnOS: a Specialized Data Service for High Energy Physics Analysis. - Sajid Ali; Steven Calvez; Philip H. Carns; Matthieu Dorier; Pengfei Ding; James Kowalkowski; Robert Latham; Andrew Norman; Marc F. Paterno; Robert B. Ross; Saba Sehrish; Shane Snyder; et al. (IPDPS Workshops, 2023)