|Lattice Correction Magnets||Correction magnets that are installed inside the Short Straight Section assembly.|
|Lattice version||The lattice version refers to a certain hardware installation in the tunnel. It is clearly separated from the optics version and one lattice version can have more than one optics version.|
|Left and right||See the definition under ’right and left’.|
|Long range interactions||Interaction between the two LHC beams in the common part of the Ring 1 and Ring 2 where the two beams are separated by the crossing angle orbit bumps.
|Long Straight Section (LSS)||the quasi-straight sections between the upstream and downstream dispersion suppressor of an insertion, including the separation / recombination dipole magnets.|
|Luminous region||The 3-dimensional distribution of the collision event vertices.|
|Luminosity reduction||Geometric luminosity reduction factor due to beam offset ‘R’: Reduced beam overlap due to transversal offset of collisions, frequently used for reduction of luminosity (levelling) and VdM scans.
Luminosity reduction factor due to crossing angle 'S': Reduced beam overlap due to tilted bunch shape due to crossing angle.
Total luminosity reduction factor ‘F’ = R*H*S1