2,486 research outputs found
Axial-vector meson mixing in orthocharmonium decays
The new BES measurement on the two-body decays of J/psi and psi' into an
axial-vector meson and a pseudoscalar meson is analyzed with the axial-K mixing
including the one-photon annihilation contribution. A somewhat puzzling pattern
of the K_1^+ K^- decay channels can be understood with no tight constraint on
the mixing angle. The branching fractions of the K_1^0 K-bar^0 channels will be
the cleanest source of information to determine the mixing angle from the 1^+
0^- decays of J/psi and psi'.Comment: 14 pages with 4 eps figure
Co-designing interventions within quality improvement initiatives : notes from the field
Increasingly, quality improvement programmes are developed with an explicit mandate to involve patients, carers, and members of the public. A quality improvement and research programme in Northwest London has nearly a decade of experience in this field. This article provides an overview of how improvement initiatives supported by the programme have involved patients in the co-design of interventions within various clinical settings. Reflections on some of the challenges and facilitators are offered. Extending roles for patients beyond co- designing interventions to involving them in implementation offers new levels of engagement and transparenc
Spatial Resolution of a Micromegas-TPC Using the Charge Dispersion Signal
The Time Projection Chamber (TPC) for the International Linear Collider will
need to measure about 200 track points with a resolution close to 100 m. A
Micro Pattern Gas Detector (MPGD) readout TPC could achieve the desired
resolution with existing techniques using sub-millimeter width pads at the
expense of a large increase in the detector cost and complexity. We have
recently applied a new MPGD readout concept of charge dispersion to a prototype
GEM-TPC and demonstrated the feasibility of achieving good resolution with pads
similar in width to the ones used for the proportional wire TPC. The charge
dispersion studies were repeated with a Micromegas TPC amplification stage. We
present here our first results on the Micromegas-TPC resolution with charge
dispersion. The TPC resolution with the Micromegas readout is compared to our
earlier GEM results and to the resolution expected from electron statistics and
transverse diffusion in a gaseous TPC.Comment: 5 pages, 8 figures, to appar in the Proceedings of the 2005
International Linear Collider Workshop (LCWS05), Stanford, 18-22 March 200
TEMPERATURE-DEPENDENCE OF DOMAIN-WALL COERCIVE FIELD IN MAGNETIC GARNET-FILMS
The coercive properties of magnetically uniaxial liquid-phase epitaxy garnet films were investigated between 10 K and the Neel temperature (T(N) less-than-or-equal-to 500 K). Two independent methods, the results of which are nearly identical (magnetical response of oscillating domain walls and the method of coercive loops measured in a vibrating sample magnetometer), were used. Besides the usual domain-wall coercive field, H(dw), the critical coercive pressure, p(dw), was also introduced as it describes in a direct way the interactions of the domain walls with the wall-pinning traps. Both H(dw) and p(dw) were found to increase exponentially with decreasing temperature. Three different types of wall-pinning traps were identified in the sample and their strength, their rate of change with temperature, and their temperature range of activity were determined
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