Update to the U.S. National Input to the European Strategy Update for Particle Physics
Andr\'e de Gouv\^ea (1), Hitoshi Murayama (2), Mark Palmer (3), Heidi Schellman (4) (for the Executive Committees of Division of Particles, Fields, Division of Physics of Beams of the American Physical Society, (1) Northwestern University, (2) Tokyo U., IPMU, UC, Berkeley, LBL

TL;DR
This paper updates the U.S. community's input to the European Strategy for Particle Physics, incorporating new strategic reports and the formation of a U.S. Muon Collider Collaboration, to inform future international research directions.
Contribution
It provides the latest U.S. community perspectives and responses to the European Strategy update, including new strategic inputs and collaborative efforts.
Findings
Inclusion of a long-term strategy report from the National Academies.
Formation of a U.S. Muon Collider Collaboration.
Updated responses to European Strategy questions.
Abstract
In this document we update the status of U.S. community inputs for the European Strategy for Particle Physics Update (ESPPU) since April 1, 2025, and offer responses to the revised questions. Major new inputs include a long-term strategy report from the National Academies of Sciences, Engineering, and Medicine and the formal formation of a U.S. Muon Collider Collaboration.
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Taxonomy
TopicsParticle physics theoretical and experimental studies · Neutrino Physics Research · International Science and Diplomacy
