Phys.Rev.Lett.91:211801,2003 We present measurements of the polarization of the $ J/\psi $ produced in
800-GeV proton interactions with a copper target. Polarization of the $ J/\psi
$ is sensitive to ...the $ c \bar{c} $ production and hadronization processes. A
longitudinal polarization is observed at large $ x_{F} $, while at small $
x_{F} $ the state is produced essentially unpolarized or slightly transversely
polarized. No significant variation of the polarization is observed versus $
p_{T} $.
To determine waiting times for an initial orthopedic consultation and subsequent knee replacement surgery in Ontario and patients' acceptance of these waiting times.
Mailed patient survey to 185 ...randomly selected knee replacement recipients discharged from 5 Ontario hospitals between 1985 and 1990, with telephone followup after 2 mailings, implemented between May and July, 1992. Patients were asked about waiting times for their initial orthopedic consultation and subsequent knee replacement surgery and their acceptance of these waiting times.
Of the 185 patients, 40 were excluded because they were deceased, unable to respond, or not traceable. Of the 145 eligible patients, 127 or 87.6% responded. The median waiting times for an initial consultation and for knee replacement surgery were 4.0 and 9.5 weeks, respectively. Waiting times did not change significantly over the 5-year study period (Pearson correlation coefficients: 0.07, p = 0.53, for consultation, and -0.08, p = 0.44, for surgery). The waiting times for consultation and surgery were acceptable to 93.2% (95% confidence interval: 88.7-97.7%) and 88.1% (95% confidence interval: 82.3-93.9%) of respondents, respectively. The average acceptable surgical waiting time of 13.2 weeks was significantly shorter than the not acceptable average of 34.3 weeks (p < 0.001).
The average waiting periods for an initial orthopedic consultation and subsequent knee replacement surgery were relatively short, and the majority of patients considered their waiting times acceptable.
The Fermilab E866/NuSea Collaboration has measured the Drell-Yan dimuon cross
sections in 800 GeV/$c$ $pp$ and $pd$ collisions. This represents the first
measurement of the Drell-Yan cross section in ...$pp$ collisions over a broad
kinematic region and the most extensive study to date of the Drell-Yan cross
section in $pd$ collisions. The results indicate that recent global parton
distribution fits provide a good description of the light antiquark sea in the
nucleon over the Bjorken-$x$ range $0.03 \lesssim x < 0.15$, but overestimate
the valence quark distributions as $x \to 1$.
The recent discoveries in the neutrino sector in the Standard Model have opened a new frontier in high energy physics. Understanding neutrinos and how they interact is crucial to continuing to verify ...the Standard Model and look for beyond Standard Model physics. The MiniBooNE experiment is a /spl nu//sub /spl mu///spl rarr//spl nu//sub e/ oscillation search designed to confirm or rule out the neutrino oscillation signal seen by the LSND experiment at the Los Alamos National Laboratory. The MiniBooNE detector, a sphere filled with mineral oil and lined with 8" Hamamatsu photomultiplier tubes (PMTs), uses Cerenkov imaging to identify /spl nu//sub /spl mu// and /spl nu//sub e/ interactions. The PMTs are the main detector component and must be well understood. They underwent a series of tests to determine their functionality and figures of merit in order to be placed in the detector, as described here.
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