/usr/include/ThePEG/Vectors/ is in libthepeg-dev 1.8.0-1.
This file is owned by root:root, with mode 0o755.
..
/usr/include/ThePEG/Vectors/HepMCConverter.h
/usr/include/ThePEG/Vectors/HepMCConverter.tcc
/usr/include/ThePEG/Vectors/HepMCTraits.h
/usr/include/ThePEG/Vectors/Lorentz5Vector.fh
/usr/include/ThePEG/Vectors/Lorentz5Vector.h
/usr/include/ThePEG/Vectors/LorentzRotation.fh
/usr/include/ThePEG/Vectors/LorentzRotation.h
/usr/include/ThePEG/Vectors/LorentzVector.fh
/usr/include/ThePEG/Vectors/LorentzVector.h
/usr/include/ThePEG/Vectors/SpinHalfLorentzRotation.h
/usr/include/ThePEG/Vectors/SpinOneLorentzRotation.fh
/usr/include/ThePEG/Vectors/SpinOneLorentzRotation.h
/usr/include/ThePEG/Vectors/ThreeVector.fh
/usr/include/ThePEG/Vectors/ThreeVector.h
/usr/include/ThePEG/Vectors/Transverse.fh
/usr/include/ThePEG/Vectors/Transverse.h