They discovered that the theory worked in a regime it hadn't been tested before; I'm not sure what "new physics" means in your sentence: it is a core assumption of physics that it's rules are always true, that all physics has always existed.
New physics in this context means previously unknown effects or mechanisms, or even a new theory/framework for an already understood phenomenon. Using "physics" in this way is common amongst academics.
Do you have two aliases on HN, or are you simply presuming to speak for the OP?