We discuss how a possible violation of the combined symmetry $CPT$ in the $B$ meson system can be investigated at the LHC. We show how a tagged and an untagged analysis of the decay modes of both $B_d$ and $B_s$ mesons can lead not only to a possible detection of a $CPT$-violating new physics but also to an understanding of its precise nature. The implication of $CPT$ violation to a large mixing phase in the $B_s$ system is also discussed.

• Received 10 February 2010

DOI:https://doi.org/10.1103/PhysRevD.81.076010