U

UFO: Unidentified falling object

Unknown small object (think of a grain of dust) that is falling within the LHC beam pipe into the beam, leading to large interactions between the beam and the object, and thus particle showers. UFOs are known to cause LHC beam dumps upon detection, as a protective measure.

Urania

High-level physics analysis software repository, similar to Castelao, but with the same low-level dependencies as the Gaudi project. This project is where crucial and central packages such as those used for PID response and track efficiency corrections are to be found (PIDCalib, TrackCalib). Refer to the repository for a list of available packages.

USPG: Upgrade Software Planning Group

Advisory body to the LHCb management that coordinates the activities for the LHCb software for the Upgrade.

UX85

CERN designation name for the LHCb experiment hall underground.

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