/usr/ is in libroot-math-physics-dev 5.34.14-1build1.
This file is owned by root:root, with mode 0o755.
..
/usr/lib/
/usr/lib/x86_64-linux-gnu/
/usr/share/
/usr/share/doc/
/usr/share/doc/libroot-math-physics-dev/
/usr/share/doc/libroot-math-physics-dev/copyright
/usr/include/
/usr/include/root/
/usr/include/root/TRobustEstimator.h
/usr/include/root/TFeldmanCousins.h
/usr/include/root/TVector2.h
/usr/include/root/TRotation.h
/usr/include/root/TQuaternion.h
/usr/include/root/TRolke.h
/usr/include/root/TLorentzRotation.h
/usr/include/root/TLorentzVector.h
/usr/include/root/TGenPhaseSpace.h
/usr/include/root/TVector3.h
/usr/lib/x86_64-linux-gnu/libPhysics.so
/usr/share/doc/libroot-math-physics-dev/changelog.Debian.gz