I

IOV: Interval Of Validity

The period of time for which a specific piece of conditions data is valid.

IP: Impact Parameter

The shortest distance between a track and a vertex. In selections typically used with respect to the associated primary vertex or vertex of origin.

IPCHI2: Impact Parameter $$\chi^2$$

$$\chi^2$$ of the impact parameter ($$\chi_\mathrm{IP}^2$$) of a track with respect to a vertex. A measure for how well a track can be separated from a vertex, in other words how likely the track originated from the vertex.

IT: Inner Tracker

A silicon tracker covering the high-occupancy inner region of the 3 tracking stations located after the magnet. Much like the TT, each IT station consists of 4 layers of silicon strips, oriented at 0°, −5°, +5° and 0° from the vertical.