  We examine the feasibility of the Bell test (i.e., detecting a violation of
the Bell inequality) with the ATLAS detector in Large Hadron Collider (LHC) at
CERN through the flavor entanglement between the B mesons. After addressing the
possible issues that arise associated with the experiment and how they may be
treated based on an analogy with conventional Bell tests, we show in our
simulation study that under realistic conditions (expected from the LHC Run 3
operation) the Bell test is feasible under mild assumptions. The definitive
factor for this promising result lies primarily in the fact that the ATLAS
detector is capable of measuring the decay times of the B mesons independently,
which was not available in the previous experiment with the Belle detector at
KEK. This result suggests the possibility of the Bell test in much higher
energy domains and may open up a new arena for experimental studies of quantum
foundations.
