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CP and T Violation in Neutrino Oscillations and Invariance of Jarlskog's Determinant to Matter Effects
P. F. Harrison, W. G. Scott
Terrestrial matter effects in neutrino propagation are T-invariant, so that any observed T violation when neutrinos pass through the Earth, such as an asymmetry between the transit…
Nucleon Structure, Duality and Elliptic Theta Functions
W. G. Scott
Nucleon structure functions are shown to have a qualitative (or `formal') relation to the classical elliptic theta functions. In particular, theta_1'/2 shows a clear resemblance to…
Measurement of the W+W-gamma Cross-section and First direct Limits on Anomalous Electroweak Quartic Gauge Couplings
The OPAL collaboration, G. Abbiendi
A study of W+W- events accompanied by hard photon radiation produced in e+e- collisions at LEP is presented. Events consistent with two on-shell W-bosons and an isolated photon are…
Tri-Maximal vs Bi-Maximal Neutrino Mixing
W. G. Scott
It is argued that data from atmospheric and solar neutrino experiments point strongly to tri-maximal or bi-maximal lepton mixing. While (`optimised') bi-maximal mixing gives an exc…
Search for Neutral Higgs Bosons in e+e- Collisions at sqrt(s) ~189GeV
The OPAL collaboration, G. Abbiendo
A search for neutral Higgs bosons has been performed with the OPAL detector at LEP, using approximately 170 pb-1 of e+e- collision data collected at sqrt(s)~189GeV. Searches have b…
Search for Higgs Bosons and Other Massive States decaying into two Photons in e+e- Collisions at 189 GeV
The OPAL collaboration, G. Abbiendi et al
A search is described for the generic process e+e- to X Y, where X is a neutral heavy scalar boson decaying into a pair of photons, and Y is a neutral heavy boson (scalar or vector…
A Redetermination of the Neutrino Mass-Squared Difference in Tri-Maximal Mixing with Terrestrial Matter Effects
P. F. Harrison, D. H. Perkins, W. G. Scott
We re-fit for the neutrino mass-squared difference in the threefold maximal (ie. tri-maximal) mixing scenario using recent CHOOZ and SUPER-K data, taking account of matter e…
Search for Scalar Top and Scalar Bottom Quarks at sqrt(s) = 189 GeV at LEP
The OPAL Collaboration, G. Abbiendi et al
Searches for a scalar top quark and a scalar bottom quark have been performed using a data sample of 182 pb-1 at a centre-of-mass energy of 189 GeV collected with the OPAL detector…
Colour reconnection studies in e+e- -> W+W- at sqrt(s)=183 GeV
The OPAL Collaboration, G. Abbiendi et al
The predicted effects of final state interactions such as colour reconnection are investigated by measuring properties of hadronic decays of W bosons, recorded at a centre-of-mass…
Search for Baryon and Lepton Number Violating Z0 Decays
The OPAL Collaboration, G. Abbiendi et al
Using data collected with the OPAL detector at LEP, we have searched for the processes e+e- -> Z0 -> p e-, p mu- and the charge conjugate final-states. These would violate the cons…