Neutrino Masses in a 5D SU(3)WSU(3)_W TeV Unification Model

We study the generation of neutrino masses in the $SU(3)_W$ electroweak unified theory in $M_4\times S_1/(Z_2\times Z'_2)$ spacetime. By appropriate orbifolding, the bulk symmetry $SU(3)_W$ is broken into $SU(2)_L \times U(1)_Y$ at one of the fixed points, where the quarks reside. The leptons form $SU(3)_W$ triplets, localized at the other symmetric fixed point. The fermion masses arise from the bulk Higgs sector containing a triplet and an anti-sextet. We construct neutrino Majorana masses via 1-loop quantum corrections by adding a parity odd bulk triplet scalar. No right-handed neutrino is needed. The neutrino mass matrix is of the inverted hierarchy type. We show that the model can easily accommodate the bi-large mixing angle solution favored by the recent neutrino experiments without much fine tuning of parameters. The constraints from \mu\ra 3e transition and neutrinoless double beta decays are discussed.Comment: 14 pages, 4 figure

"Volatility Models of Currency Futures in Developed and Emerging Markets"

This paper examines volatility models of currency futures contracts for three developed markets and two emerging markets. For each contract, standard models of the Unbiased Expectations Hypothesis (UEH) and Cost-of-Carry hypothesis (COC) are extended to derive volatility models corresponding to each of the two standard approaches. Each volatility model is formulated as a system of individual equations for the conditional variances of futures returns, spot returns and the domestic risk-free interest rate. The empirical results suggest that the conditional volatility of futures return for emerging markets is significant in explaining the conditional volatility of returns in the underlying spot market. For developed markets, however, the conditional volatility of the spot returns is significant in explaining the conditional volatility of futures returns. Moreover, it is found that the domestic risk-free interest rate has little impact on the conditional variances of the futures, spot and domestic risk-free interest rates.

Accurate Mass Determinations in Decay Chains with Missing Energy: II

We discuss kinematic methods for determining the masses of the particles in events at a hadron collider in which a pair of identical particles is produced with each decaying via a series of on-shell intermediate beyond-the-SM (BSM) particles to visible SM particles and an invisible particle (schematically, pp -> ZZ + jets with Z -> Aa -> Bba -> Ccba -> ... -> cba... + N where a,b,c,... are visible SM particles or groups of SM particles, A,B,C,... are on-shell BSM particles and N is invisible). This topology arises in many models including SUSY processes such as squark and gluino pair production and decay. We present the detailed procedure for the case of Z -> 3 visible particles + N and demonstrate that the masses obtained from the kinematic procedure are independent of the model by comparing SUSY to UED.Comment: v2, published version in PR

An ecological study of butter-clam (Saxidomus giganteus) toxicity in southeast Alaska

Thesis (M.S.) University of Alaska Fairbanks, 1971Butter clams (Saxidomus giganteus) at South and North porpoise Islands and Pleasant Island, Southeast Alaska, were occasionally found to accumulate significant amounts (higher than the maximum human tolerance) of paralytic shellfish poison (PSP) at any season of the year, and to occasionally lose or regain PSP rapidly between two samplings. The fluctuations of toxicity levels were not similar at all stations and no consistent patterns were Observed. The toxicity of only 19 out of 53 samples collected at three high-toxicity stations exceeded the maximum human tolerance level for PSP (1200 MU), and clam samples taken from moderate and low-toxicity stations never exceeded this level. Neither phytoplankton populations nor hydrographic parameters had a consistently significant correlation with toxicity levels; however, fluctuations of phytoplankton numbers demonstrated an inverse relationship with fluctuations of inorganic nutrient concentrations. Dinoflagellate maxima tended to occur at relatively low salinity (22% - 29%) and relatively high temperatures (7°C - 16°C), whereas the diatom numbers did not significantly correlate with salinity or temperature. The three high-toxicity stations were all within Icy Passage; fluctuations of phytoplankton populations and the hydrographic conditions at these stations were similar, yet the fluctuations of toxicity levels were quite dissimilar. A number of possible sources may be responsible for the butter-clam toxicity in Southeast Alaska. However, more studies are needed to define the cause of the butter-clam poisoning problem in Southeast Alaska

Memories of the future

The year is 2020. Sheffield University’s MSc in Electronic & Digital Library Management has been running for 10 years. What paths have its graduates’ careers taken

SUSY Hidden in the Continuum

We study models where the superpartners of the ordinary particles have continuous spectra rather than being discrete states, which can occur when the supersymmetric standard model is coupled to an approximately conformal sector. We show that when superpartners that are well into the continuum are produced at a collider they tend to have long decay chains that step their way down through the continuum, emitting many fairly soft standard model particles along the way, with a roughly spherical energy distribution in the center of mass frame.Comment: 26 pages, 9 figures. Update of Fig.5 and added aknowledgement