O

ODIN

A readout supervision module of timing and fact control, see the final Readout Supervisor ODIN document for Runs 1 and Run 2. An updated version used in Upgrade I is called S-ODIN.

OPG: Operation Planning Group

Advisory body to the LHCb management that is responsible for collecting and processing data according to the priorities set out by the PPG.

ORIGINVERTEX: Origin vertex

The vertex a particle is originating from. For prompt particles it corresponds to the primary vertex, and for non-prompt particles it corresponds to the decay vertex of the parent particle.

OT: Outer Tracker

During Runs 1 and 2, the OT was a straw-chamber tracker that covered the low-occupancy outer region of the 3 tracking stations located after the magnet.