The parity-violating longitudinal analyzing power, A(z), has been measured in pvectorp elastic scattering at an incident proton energy of 221 MeV. The result obtained is A(z) = ...0.84+/-0.29(stat)+/-0.17(syst)x10(-7). This experiment is unique in that it selects a single parity violating transition amplitude (3P2 - 1D2) and consequently directly constrains the weak meson-nucleon coupling constant h(pp)(rho). When this result is taken together with the existing pvectorp parity violation data, the weak meson-nucleon coupling constants h(pp)(rho) and h(pp)(omega) can, for the first time, both be determined.
We report results of a high resolution search for the tensor glueball candidate ξ(2230) in a p̄p formation experiment. π0π0 and ηη decay channels were measured in a scan of the mass region 2220 MeV ...to 2240 MeV. No evidence for the existence of ξ(2230) was found. 95% confidence upper limits for the possible existence of ξ are presented.
The distribution of
m(
π
+
π
−) in the decay
η′ →
π
+
π
−
γ has been measured with the Crystal Barrel detector. The results are based on a total of 7392 observed η′ decays. The box anomaly constant ...is extracted from this and its value is found to agree well with theoretical expectations. The pseudoscalar nonet parameters (
f
1,
f
8 and
θ
PS) are determined. Finally, we find that there is a problem of consistency between QCD and the standard VDM assumption.
A monitor of beam polarization profiles for the TRIUMF parity experiment Berdoz, A.R; Birchall, J; Bland, J.B ...
Nuclear instruments & methods in physics research. Section A, Accelerators, spectrometers, detectors and associated equipment,
01/2001, Letnik:
457, Številka:
1
Journal Article
Recenzirano
TRIUMF experiment E497 is a study of parity violation in pp scattering at an energy where the leading term in the analyzing power is expected to vanish, thus measuring a unique combination of ...weak-interaction flavor-conserving terms. It is desired to reach a level of sensitivity of 2×10
−8 in both statistical and systematic errors. The leading systematic errors depend on transverse polarization components and, at least, the first moment of transverse polarization. A novel polarimeter that measures profiles of both transverse components of polarization as a function of position is described.
An experiment to study double-strangeness systems was performed at the BNL-AGS via the (K
−,K
+) reaction using a diamond target and scintillating fiber (SCIFI) blocks (E885). A search for the H ...dibaryon through the stopped Ξ
− process is one of the objectives. The number of stopped Ξ
−'s is about 9,000, and the expected sensitivity of the H dibaryon search is more than one order of magnitude higher than that of the previous experiment at KEK-PS (E224).
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