Phys.Rev.C64:035502,2001 We compute the photon asymmetry $B_\gamma$ for near threshold parity
violating (PV) pion photoproduction through sub-leading order. We show that
sub-leading contributions ...involve a new combination of PV couplings not
included in previous analyses of hadronic PV. We argue that existing
constraints on the leading order contribution to $B_\gamma$ -- obtained from
the PV $\gamma$-decay of $^{18}$F -- suggest that the impact of the subleading
contributions may be more significant than expected from naturalness argumen
Phys.Rev. D63 (2001) 033006 We construct the complete SU(2) parity-violating (PV) $\pi, N, \Delta$
interaction Lagrangian with one derivative, and calculate the chiral
corrections to the PV Yukawa ...$NN\pi$ coupling constant $h_\pi$ through ${\cal
O}(1/\Lambda_\chi^3)$ in the leading order of heavy baryon expansion. We
discuss the relationship between the renormalized $\hpi$, the measured value of
$\hpi$, and the corresponding quantity calculated microscopically from the
Standard Model four-quark PV interaction.
Phys.Rev. D62 (2000) 033008 Parity-violating (PV) interactions among quarks in the nucleon induce a PV
$\gamma NN$ coupling, or anapole moment (AM). We compute electroweak
gauge-independent ...contributions to the AM through ${\cal O}(1/\lamchis)$ in
chiral perturbation theory. We estimate short-distance PV effects using
resonance saturation. The AM contributions to PV electron-proton scattering
slightly enhance the axial vector radiative corrections, R_A^p, over the scale
implied by the Standard Model when weak quark-quark interactions are neglected.
We estimate the theoretical uncertainty associated with the AM contributions to
R_A^p to be large, and discuss the implications for the interpretation PV of ep
scattering.
Yardney Technical Products is developing a high energy density Li-ion cell tailored for NASA's Extravehicular Mobility Unit battery. The goal of the program is to develop a Li-ion technology which ...offers long storage and cycle life in a system which provides energy density and exercise performance comparable to the current 6.7kg Zn-AgO battery. The Zinc-Silver Oxide cells which are most commonly used in this application provide 400 Wh/I with a 32 cycle life at 26.6Ah and 1.55V with a rated wet life of 425 days. To improve the energy density of the Li-ion cells we have focused on improving the energy density of its components. In addition to using thin metal foil current collectors, the energy density of the cathode material was improved by utilizing a high capacity Co doped nickel oxide material. Further efforts have focused on developing a more energy dense carbonaceous anode material. The results of this effort are reviewed.
We compute the photon asymmetry \(B_\gamma\) for near threshold parity violating (PV) pion photoproduction through sub-leading order. We show that sub-leading contributions involve a new combination ...of PV couplings not included in previous analyses of hadronic PV. We argue that existing constraints on the leading order contribution to \(B_\gamma\) -- obtained from the PV \(\gamma\)-decay of \(^{18}\)F -- suggest that the impact of the subleading contributions may be more significant than expected from naturalness argumen
We construct the complete SU(2) parity-violating (PV) \(\pi, N, \Delta\) interaction Lagrangian with one derivative, and calculate the chiral corrections to the PV Yukawa \(NN\pi\) coupling constant ...\(h_\pi\) through \({\cal O}(1/\Lambda_\chi^3)\) in the leading order of heavy baryon expansion. We discuss the relationship between the renormalized \(\hpi\), the measured value of \(\hpi\), and the corresponding quantity calculated microscopically from the Standard Model four-quark PV interaction.
Parity-violating (PV) interactions among quarks in the nucleon induce a PV \(\gamma NN\) coupling, or anapole moment (AM). We compute electroweak gauge-independent contributions to the AM through ...\({\cal O}(1/\lamchis)\) in chiral perturbation theory. We estimate short-distance PV effects using resonance saturation. The AM contributions to PV electron-proton scattering slightly enhance the axial vector radiative corrections, R_A^p, over the scale implied by the Standard Model when weak quark-quark interactions are neglected. We estimate the theoretical uncertainty associated with the AM contributions to R_A^p to be large, and discuss the implications for the interpretation PV of ep scattering.
