37,199 research outputs found
Strong decay amplitudes using the Talmi-Moshinsky transformation and the suppressed production of the hybrid
The Talmi-Moshinsky transformation is applied to the strong decay and
production of mesons. Amplitudes for conventional mesons are obtained in a
simple way and are generalised to encompass the production and decay of hybrid
states. The selection rule disfavouring hybrid decay into pairs of identical
S-wave mesons has a natural explanation and a new class of selection rules is
uncovered with implications for production of the exotic hybrid in
experiments, charmonia decays and the lattice.Comment: 15 pages; some significant changes in revised version including
additional phenomenolog
P-wave spin-spin splitting and meson loops
In quark potential models the hyperfine splitting of P-wave mesons is zero in
the nonrelativistic limit, a prediction strikingly confirmed by experiment in
both charmonia and bottomonia. The result, however, ignores the coupling of
bare quarkonia to meson-meson pairs. This coupling causes mass shifts among the
states and so could potentially spoil the quark model prediction. This turns
out not to be the case: in a variety of models the hyperfine splitting remains
small despite large mass shifts. This is shown to be a generic feature of
models in which the coupling involves the creation of a light quark pair with
spin-one and the quark spin wavefunctions are conserved. This talk reports on
the results of Phys. Rev. D84, 034021 (2011).Comment: 4 pages, typo corrected. Contribution to the Proceedings of the XIV
International Conference on Hadron Spectroscopy (Hadron 2011), 13-17 June
2011, Munich, German
Electro-optical Sensors Research Study and Astronomical Observations Semiannual Progress Report, 15 Jun. - 15 Dec. 1965
Astronomical observations of short period cluster variables, image orthicon tube performance stability research, and development of strong field magnetically focused image tube
Measurements of the indium hyperfine structure in an atmospheric-pressure flame by use of diode-laser-induced fluorescence
We report on what we believe is the first demonstration of laser-induced fluorescence (LIF) in flames by use of diode lasers. Indium atoms seeded into an atmospheric-pressure flame at trace concentrations are excited by a blue GaN laser operating near 410 nm. The laser is mounted in an external-cavity configuration, and the hyperfine spectrum of the 5(2)P(1/2) → 6(2)S(1/2) transition is captured at high resolution in single-wavelength sweeps lasting less than one tenth of a second. The research demonstrates the potential of diode-based LIF for practical diagnostics of high-temperature reactive flows
Biomedical radiation detecting probe Patent
Silicon radiation detecting probe design for in vivo biomedical us
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