10,764 research outputs found
Precision Measurement of sin^2 theta_W at a Reactor
This paper presents a strategy for measuring sin^2 theta_W to ~1% at a
reactor-based experiment, using antineutrinos electron elastic scattering. This
error is comparable to the NuTeV, SLAC E158, and APV results on sin^2 theta_W,
but with substantially different contributions to the systematics. An improved
method for identifying antineutrino proton events, which serve both as a
background and as a normalization sample, is described. The measurement can be
performed using the near detector of the presently proposed reactor-based
oscillation experiments. We conclude that an absolute error of delta(sin^2
theta_W)=0.0019 may be achieved.Comment: To be Submitted to Phys. Rev.
Using Reactors to Measure
A next-generation neutrino oscillation experiment using reactor neutrinos
could give important information on the size of mixing angle . The
motivation and goals for a new reactor measurement are discussed in the context
of other measurements using off-axis accelerator neutrino beams. The reactor
measurements give a clean measure of the mixing angle without ambiguities
associated with the size of the other mixing angles, matter effects, and
effects due to CP violation. The key question is whether a next-generation
experiment can reach the needed sensitivity goals to make a measurement for
at the 0.01 level. The limiting factors associated with
a reactor disappearance measurement are described with some ideas of how
sensitivities can be improved. Examples of possible experimental setups are
presented and compared with respect to cost and sensitivity
A strong correlation in radio pulsars with implications for torque variations
We present an analysis of the spin-down parameters for 131 radio pulsars for
which has been well determined. These pulsars have characteristic
ages ranging from yr and spin periods in the range 0.4--30 s;
nearly equal numbers of pulsars have as . We find a
strong correlation of with , {\em independent of the sign
of} . We suggest that this trend can be accounted for by small,
stochastic deviations in the spin-down torque that are directly proportional
(in magnitude) to the spin-down torque.Comment: MNRAS, 4 pages, 2 figures. Minor editorial changes and typos
correcte
Differential thresholds for motions in the periphery
Differential thresholds for rotary and linear motion in the peripher
Pentaquark searches at FOCUS
We find no evidence for high-energy photoproduction of pentaquarks at 1540
MeV/, 1862 MeV/, or 3099 MeV/ using decay modes ,
, and , respectively.Comment: Proceedings from talk at 2004 DPF Meeting at University of
California, Riversid
- …