4,122 research outputs found
CP Violating Observables in
We consider various integrated lepton charge-energy asymmetries and azimuthal
asymmetries as tests of CP violation in the process . These
asymmetries are sensitive to different linear combinations of the CP violating
form factors in the three gauge boson production vertex, and can
distinguish dispersive and absorptive parts of the form factors. It makes use
of purely hadronic and purely leptonic modes of 's decays as well as the
mixed modes. The techniques of using the kinematics of jets or missing momentum
to construct CP--odd observables are also employed. These CP violating
observables are illustrated in the generalized Left-Right Model and the Charged
Higgs Model.Comment: 23 pages, plus 11 postscript graphs not posted befor
CP violation in top pair production at an e^+e^- collider
We investigate a possible CP violating effect in annihilation into
top quark pairs. As an illustrative example, we assume the source of
the CP nonconservation is in the Yukawa couplings of a neutral Higgs boson
which contain both scalar and pseudoscalar pieces. One of the interesting
observable effects is the difference in production rates between the two CP
conjugate polarized states.Comment: 9 pages, 3 postscript figures not included but availabel upon
request, CERN-TH.6658/9
Dispersion relations for stationary light in one-dimensional atomic ensembles
We investigate the dispersion relations for light coupled to one-dimensional
ensembles of atoms with different level schemes. The unifying feature of all
the considered setups is that the forward and backward propagating quantum
fields are coupled by the applied classical drives such that the group velocity
can vanish in an effect known as "stationary light". We derive the dispersion
relations for all the considered schemes, highlighting the important
differences between them. Furthermore, we show that additional control of
stationary light can be obtained by treating atoms as discrete scatterers and
placing them at well defined positions. For the latter purpose, a multi-mode
transfer matrix theory for light is developed
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