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There are 3 equivalent simple ways to obtain small "seesaw" Majorana neutrino masses. One of these turns out to admit a new unexpected extra U(1) gauge symmetry of quarks and leptons. It has many possible phenomenological implications on new lepton interactions, which may be relevant to recent experimental data such as those from NuTeV, atomic parity violation and the muon g-2, etc.
3:00 pm, 472 Willamette Hall
Refreshments served at 2:45
First I will briefly summarize the results of observation of atmospheric neutrinos and solar neutrinos and then I will explain the status of three and four flavor mixing schemes. I will also mention about phenomenology of future long baseline experiments. I will try to present my talk so that non-experts understand the recent situation of the subject.
4:00 pm, 472 Willamette Hall
Refreshments served at 3:45
We explore CP violation in a left-right symmetric model in which the VEVs of the scalar bi-doublet are in the ratio m_b : m_t. In the general scenario, we find that there are only 2 fundamental CP phases and that the model exhibits a surprising simplicity in the relations of the quark rotation angles and CP phases between the left and right-handed CKM matrices. Our numerical analysis of the model strongly disfavors scenarios where CP violation solely comes from the Higgs VEV's (pseudo-manifest) or only from the Yukawa couplings (quasi-manifest). Furthermore, current experimental data allow a flavor-changing neutral Higgs as low as 7 TeV and a right-handed W as light as 2 TeV.
4:00 pm, 472 Willamette Hall
Refreshments served at 3:45
Recent results from neutrino oscillation experiments indicate non-zero neutrino masses and increase confidence that neutrinoless double beta decay might be observable in a sufficiently large experiment. An R&D program is underway to study the use of the isotope Xenon(136) in such a search. The chemical- and radio-purity attainable with xenon, and the good energy resolution in xenon as a detection medium, make this element an attractive candidate. In addition, a novel decay-daughter tagging method is under study that would allow for coincident detection and lead to the dramatically reduced backgrounds required to make a large scale (>1 ton) search feasible.
2:00 pm, 472 Willamette Hall
NOTE SPECIAL TIME
Refreshments served at 1:50
I shall start with a brief introduction to the Charged Higgs Boson in the MSSM. Then I shall discuss the Tevatron/LHC signatures for the Charged Higgs Boson, concentrating mainly in the case of H+- being heavier than the top quark. The implications of going to the NMSSM will be briefly discussed at the end.
4:00 pm, 472 Willamette Hall
Refreshments served at 3:45
Over the past decade, searches for D0-D0bar mixing have become increasingly more sensitive and have, therefore, set narrower limits on possible indicators of New Physics. Most of these searches have been performed with the hadronic decays of the D0(e.g., K pi, K pi pi0) but it's the semileptonic decay channels that offer the most direct measurement of the mixing rate, R_mix. Using the CLEOII.V dataset, we have performed the first search for evidence of D0-D0bar mixing using the decay D0 -> K* e nu. A fit for the number of "wrong sign" events, D0 -> K*+ e- nubar, gives an upper limit on R_mix at a 95% C.L. of <0.86%.
2:00 pm, 472 Willamette Hall
NOTE SPECIAL DAY AND TIME