D

DaVinci

Event selection and data analysis application. Project website.

DIRA: Direction angle

The angle between a line drawn from the primary vertex to the decay vertex of the particle and the sum of the 4-momentum of its decay products. One typically uses the cosine of the direction angle in selections.

DIRAC: Distributed Infrastructure with Remote Agent Control

DIRAC is the software framework for distributed computing used in LHCb. Official DIRAC website.

DOCA: Distance Of Closest Approach

The shortest distance between a pair of tracks.

DSS: Detector Safety System

Protection system for the experiment. Details in the Online System webpages.

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