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RESEARCH PRODUCT
Indirect CP violation in the B-system
Jose BernabeuM.c. Bañulssubject
PhysicsNuclear and High Energy PhysicsParticle physicsFlavourFOS: Physical sciencesFísicaObservableExpected valueStandard Modelsymbols.namesakeHigh Energy Physics - PhenomenologyAmplitudeHigh Energy Physics - Phenomenology (hep-ph)symbolsCP violationHigh Energy Physics::ExperimentHamiltonian (quantum mechanics)Mixing (physics)Particle Physics - Phenomenologydescription
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.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 1997-10-14 |