$\Delta t$-dependent equal-sign dilepton asymmetry and CPTV effects in the symmetry of the $B^0$--$\bar B^0$ entangled state

Abstract

In this paper we discuss experimental consequences of a novel kind of CPT violation which would manifest itself in the symmetry of the entangled initial state of $B ^0$ and $\bar B ^0$ through their loss of indistinguishability. The ``wrong'' symmetry component is proportional to $\omega$. We focus our theoretical study on the $\Delta t$-dependence of observables concerning equal-sign dilepton events for which the intensity vanishes at $\Delta t = 0$ in absence of $\omega$. We find that the charge asymmetry, $A_{sl}$, acquires a $\Delta t$-dependence linear in $\omega$, whose relative importance appears on specific regions of time still unexplored. We also do a statistical analysis for the measurements here proposed and find a high sensitivity to this new CPT-violating effect in this charge asymmetry. We obtain the first limits on the $\omega$-effect by re-analyzing existing data on the $A_{sl}$ asymmetry.