140060327
Nb-3_Al high field accelerator magnet \&
215736286
STATUS AND PERSPECTIVE OF THE NB3AL DEVELOPMENT IN JAPAN
The RHQT process enables to form a stoichiometric Nb3Al with fine-grain structures via a bcc supersaturated solid solution and so that a large Jc is achieved over the whole range of magnetic fields without trading off the excellent strain tolerance. A long-length of RHQ processing has been established, and a rectangular but Cu stabilized Nb3Al strand is about to be commercially available for NMR uses. Another stabilization technique has been developed and likely applicable to accelerator uses. Research activities at the KEK with respect to the low field Jc characterization are also described.
14917797
Predictions of m(b)/m(tau) and m(t) in an asymptotically nonfree theory
We discuss an extension of the minimal supersymmetric standard model with five generations of matter superfields. The extra generations are assumed to form a generation--mirror-generation pair (the fourth and antifourth generations) enabling the extra fermions to have $\mathrm{SU}{(2)}_{L}\ifmmode\times\else\texttimes\fi{}\mathrm{U}{(1)}_{Y}$-invariant masses. Because of the contribution of the extra generations, all three running gauge couplings of $\mathrm{SU}{(3)}_{C}\ifmmode\times\else\texttimes\fi{}\mathrm{SU}{(2)}_{L}\ifmmode\times\else\texttimes\fi{}\mathrm{U}{(1)}_{Y}$ become asymptotically nonfree while preserving gauge coupling unification at the grand unified theory (GUT) scale. We show that, due to the asymptotically nonfree character of the gauge couplings, (1) the top and bottom Yukawa couplings are strongly focused onto infrared fixed points as they are evolved down in scale making their values at $\ensuremath{\mu}{=M}_{Z}$ insensitive to their initial values at $\ensuremath{\mu}{=M}_{\mathrm{GUT}},$ (2) the model predicts ${R}_{b\ensuremath{\tau}}{(M}_{Z})\ensuremath{\equiv}{Y}_{b}{/Y}_{\ensuremath{\tau}}{|}_{\ensuremath{\mu}{=M}_{Z}}\ensuremath{\approx}1.8$, which is consistent with the experimental value provided we take the ratio of Yukawa couplings at the GUT scale to be ${R}_{b\ensuremath{\tau}}{(M}_{\mathrm{GUT}}{)=Y}_{b}{/Y}_{\ensuremath{\tau}}{|}_{\ensuremath{\mu}{=M}_{\mathrm{GUT}}}=1/3$, and (3) the $t$ mass prediction comes out to be ${m}_{t}$\ensuremath{\approx}180 GeV which is also consistent with experiment.
122212511
NuTeV anomaly, lepton universality, and nonuniversal neutrino-gauge couplings
In previous studies we found that models with flavor-universal suppression of the neutrino-gauge couplings are compatible with NuTeV and Z-pole data. In this paper we expand our analysis to obtain constraints on flavor-dependent coupling suppression by including lepton universality data from W, {tau}, {pi} and K decays in fits to model parameters. We find that the data are consistent with a variety of patterns of coupling suppression. In particular, in scenarios in which the suppression arises from the mixing of light neutrinos with heavy gauge singlet states (neutrissimos), we find patterns of flavor-dependent coupling suppression which are also consistent with constraints from {mu}{yields}e{gamma}.
59945900
Constraining non-standard interactions of the neutrino with Borexino
A bstractWe use the Borexino 153.6 ton·year data to place constraints on non-standard neutrino-electron interactions, taking into account the uncertainties in the 7Be solar neutrino flux and the mixing angle θ23, and backgrounds due to 85Kr and 210Bi β-decay. We find that the bounds are comparable to existing bounds from all other experiments. Further improvement can be expected in Phase II of Borexino due to the reduction in the 85Kr background.