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[en] The search for the two-photon decay of light penetrating bosons (axions or others), produced in a nuclear reactor, was supplemented by measurements with a rotatable set-up at the Juelich 10 MW research reactor FRJ-1. Measurements were performed in 'effect' and 'background' positions, the latter not allowing the simultaneous detection of both photons due to decay kinematics. Preliminary measurements, carried out at reactor ON condition only, show no positive effect. (orig.)
[en] Radiative decay of the massive neutrino νi→νiγ (mi>mj) in a constant crossed electromagnetic field is investigated within the framework of the standard electroweak theory. It is shown that the decay is catalyzed by the external field. This effect becomes significant in a strong crossed field (F much-gt Be = m2e/e ≅ 4.41 x 1013 G) and event more pronounced for the ultrarelativistic neutrino (Eν much-gt mν) in a relatively weak field (F much-lt Be). 11 refs., 1 fig
[en] First results are now emerging from a major Fermilab experiment which probes in detail the radiative decays of hyperons - reactions which involve strong, weak and electroweak effects. It is the latest chapter in Fermilab's tradition of detailed hyperon studies
[en] We search for a light Higgs boson A0 in the radiative decay Y(3S) → γA0, A0 → T+T-, T+ → e+νeνT, or T+ → μ+ νμT. The data sample contains 122 x 106 Y(3S) events recorded with the BABAR detector. We find no evidence for a narrow structure in the studied T+T- invariant mass region of 4.03 < mT+T- < 10.10 GeV/c2. We exclude at the 90% confidence level (C.L.) a low-mass Higgs boson decaying to T+T- with a product branching fraction B(Y(3S) → γA0) x B(A0 → T+T-) > (1.5-16) x 10-5 across the mT+T- range. We also set a 90% C.L. upper limit on the T+T- decay of the ηb at B(ηb → T+T-) < 8%.
[en] Radiative νj → νiγ and γ → νi bar νj transitions of massive Dirac neutrinos are studied in the field of a linearly polarized wave and in a constant crossed field within the framework of an invariant procedure being developed for calculations in plane-wave-type fields. It is shown that with the upper bound used for the anomalous magnetic moment of the neutrinos, consideration of the external field may be decisive in the case of the νj → νiγ (mj > mi) photodecay, with possible nontrivial consequences in the astrophysical aspect
[en] The radiative decay of to vector mesons ρ and ϕ is calculated in a non-relativistic approach. The results obtained are compared to experimental data to estimate the glue content of . We find a small or nonexistent glue content when our results are compared to the PDG data. However a considerable glue content for was found when we compared our results to the CLAS data.
[en] We show the spectral figure-of-merit (FOM) from nanohole arrays can be larger than 1900/RIU by phase-based surface plasmon resonance. By using temporal coupled mode theory, we find the p-s polarization phase jump is the sharpest when both the absorption and radiative decay rates of surface plasmon polaritons are matched, yielding an extremely small spectral differential phase linewidth and thus superior FOM. The result is supported by numerical simulation and experiment. As a demonstration, we show the phase detection outperforms the conventional spectral counterpart significantly by sensing the binding of bovine serum albumin antibodies under identical condition