Indirect CP Violation in the B-System

Details Indirect CP Violation in the B-System Indirect CP Violation in the B-System

1997-10-14

arxiv.org/abs/hep-ph/9710348v1

Phys.Lett. B423 (1998) 151-156

Physics

High Energy Physics

High Energy Physics - Phenomenology

7 pages, No figures

Scientific paper

10.1016/S0370-2693(98)00115-4

We show that, contrary to the flavour mixing amplitude q/p, both Re(epsilon) and Im(epsilon) are observable quantities, where epsilon is the phase- convention-independent CP mixing. We consider semileptonic B_d decays from a CP tag and build appropriate time-dependent asymmetries to separate out Re(epsilon) and Im(epsilon). "Indirect" CP violation would have in Im(epsilon)/(1+|epsilon|^2) its most prominent manifestation in the B-system, with expected values in the standard model ranging from -0.37 to -0.18. This quantity is controlled by a new observable phase: the relative one between the CP-violating and CP-conserving parts of the effective hamiltonian. For time-integrated rates we point out a (Delta Gamma)--> (Sigma Gamma) transmutation which operates in the perturbative CP mixing.

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