A Roadmap for HEP Software and Computing R&D for the 2020s
Johannes Albrecht, Antonio Augusto Alves Jr, Guilherme Amadio,, Giuseppe Andronico, Nguyen Anh-Ky, Laurent Aphecetche, John Apostolakis,, Makoto Asai, Luca Atzori, Marian Babik, Giuseppe Bagliesi, Marilena, Bandieramonte, Sunanda Banerjee, Martin Barisits, Lothar A.T. Bauerdick,

TL;DR
This paper outlines a strategic plan for research and development in high-energy physics software and computing to support the ambitious experimental program of the 2020s, emphasizing coordination and future readiness.
Contribution
It provides a comprehensive roadmap for R&D activities necessary to upgrade and optimize HEP software and computing infrastructure for upcoming decades.
Findings
Identifies key software R&D priorities for HL-LHC
Highlights importance of stakeholder coordination
Proposes a structured plan for software development
Abstract
Particle physics has an ambitious and broad experimental programme for the coming decades. This programme requires large investments in detector hardware, either to build new facilities and experiments, or to upgrade existing ones. Similarly, it requires commensurate investment in the R&D of software to acquire, manage, process, and analyse the shear amounts of data to be recorded. In planning for the HL-LHC in particular, it is critical that all of the collaborating stakeholders agree on the software goals and priorities, and that the efforts complement each other. In this spirit, this white paper describes the R&D activities required to prepare for this software upgrade.
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