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Re-examining sin(2beta) and Delta m(d) from evolution of B(d) mesons with decoherence
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In the time evolution of neutral meson systems, a perfect quantum coherence is usually assumed. The important quantities of the B(d) system, such as sin (2beta) and Delta m(d), are determined under this assumption. However, the meson system interacts with its environment. This interaction can lead to decoherence in the mesons even before they decay. In our formalism this decoherence is modelled by a single parameter lambda. It is desirable to re-examine the procedures of determination of sin(2beta) and Delta m(d) in meson systems with decoherence. We find that the present values of these two quantities are modulated by lambda. Re-analysis of B(d) data from B-factories and LHCb can lead to a clean determination of lambda, sin(2beta) and Delta m(d).
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Experimental limits on quantum decoherence from $B$ meson systems
A reanalysis of published LHCb data claims that neutral B meson mixing and CP asymmetry data prefer a nonzero decoherence parameter in the Bd system at about 6 sigma and in the Bs system at about 3 sigma.
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