Higgs field
not "Higgs' field" or, worse, "Higg's field"
not "Higgs' field" or, worse, "Higg's field"
Capital H, hyphen.
The ATLAS and CMS experiments have discovered a Higgs-like particle. They are not sure yet if it is the Higgs boson that the Standard Model predicts, or another, more exotic Higgs boson.
High-Luminosity Large Hadron Collider, High-Luminosity LHC (also: HiLumi)
Capital letters, note the hyphen.
The High-Luminosity LHC project (HL-LHC) will take the accelerator to new energy frontiers.
Holland is a region in the western part of the Netherlands. Don't use "Holland" to mean the whole of the Netherlands – it's incorrect.
Don't use it in a web context. Say "but".
The prefix "inter" does not take a hyphen.
interdepartmental
intergovernmental
interrelated
BUT inter-agency
Use italics for foreign phrases, unless they are commonly used in English.
An exception is eigenstates, which, although a German word, should be written in roman.
Not "K-meson"