Ambiguity between baseline and extended scenarios in collider proposals

Clarify and define the distinction between “baseline” and “extended” physics‑programme scenarios in proposed collider facilities to eliminate confusion in evaluation and prioritisation.

Background

In discussing evaluation criteria for proposed colliders, the authors observed confusion arising from indistinct use of “baseline” versus “extended” scenarios. They explicitly state that in some cases it is not clear how to distinguish between the two, which can affect survey responses and strategic evaluation.

A clear, shared definition would improve comparability of proposals and support transparent strategy decisions.