We present measurements of the inclusive production cross sections of the Upsilon(1S) bottomonium state in p (p) over bar collisions at root s=1.96 TeV. Using the Upsilon(1S)->mu(+)mu(-) decay ...mode for a data sample of 159 +/- 10 pb(-1) collected by the D0 detector at the Fermilab Tevatron collider, we determine the differential cross sections as a function of the Upsilon(1S) transverse momentum for three ranges of the Upsilon(1S) rapidity: 0 <\y(Upsilon)\<= 0.6, 0.6 <\y(Upsilon)\<= 1.2, and 1.2 <\y(Upsilon)\<= 1.8.
Primary objective: To explore the experiences of health care practitioners working with Aboriginal clients recovering from acquired brain injury (ABI).
Research design: Participatory research design ...using qualitative methods.
Methods: Fourteen in-depth, semi-structured interviews were conducted. The Framework Method of analysis was used to uncover emerging themes.
Findings: Five main categories emerged: practitioners' experience with brain injury, practitioners' experience with Aboriginal clients, specialized needs of Aboriginal clients recovering from brain injury, culturally sensitive care and traditional healing methods. These categories were then further divided into emergent themes and sub-themes where applicable, with particular emphasis on the specialized needs of Aboriginal clients.
Discussion: Each emergent theme highlighted key challenges experienced by Aboriginal peoples recovering from ABI. A key challenge was that protocols for rehabilitation and discharge planning are often lacking for clients living on reserves or in remote communities. Other challenges included lack of social support; difficulty of travel and socio-cultural factors associated with post-acute care; and concurrent disorders.
Conclusions: Results suggest that developing reasonable protocols for discharge planning of Aboriginal clients living on reserves and/or remote communities should be considered a priority.
Two recent deaths from artery dissection following neck manipulation by chiropractors have focused media and medical attention on the relation between sudden neck movement and cervical artery ...dissection. Although the first case of carotid artery dissection due to chiropractic neck manipulation was described over 50 years ago,1 the frequency of carotid and vertebral artery dissection as a cause of stroke has only been recognized in the last decade. Since then, there have been many publications and case reports on this topic. In a recent Canadian survey, dissection of the cervical arteries was one of the most common causes of stroke in patients less than 45 years of age .2 Stroke resulting from neck manipulation occurred in 28% (21/74) of our cases. Neck manipulation as a therapeutic strategy for head and neck pain is common and may be effective. In a recent literature review a chiropractic group in the United States estimated that 6% of patients with headache consulted alternative health care providers (mostly chiropractors) following the failure of conventional medical treatment.9 However, neck manipulation should probably be avoided in patients with recent acute neck pain, especially if it follows closely upon an accidental injury, because a fragile clot formed over an otherwise asymptomatic arterial tear is easily dislodged by abrupt head movement, especially rotation. Most patients undergoing therapeutic neck manipulation will have no ill effects, but there is no doubt that chiropractic neck manipulation can result in dissection of the carotid or vertebral arteries leading to stroke. Until a high-risk group can be identified, chiropractors should inform all patients of possible serious complications before neck manipulation. This is already emphasized in their current training programs. Participating investigators: Canadian Stroke Consortium (CSC) collaborators: Drs. Neville Bayer, Toronto, Ont.; Sandra Black, Toronto, Ont.; Andre Bellavance, Greenfield Park, Que.; Alastair Buchan, Calgery, Alta.; Anthony Costantino, Abbotsford, BC; Robert Duke, Hamilton, Ont; George Elleker, Edmonton, Alta.; Marek Gawel, Toronto, Ont.; Vladimir Hachinski, London, Ont.; Michael Hill, Calgary, Alta.; Jack Jhamandas, Edmonton, Alta.; Frank Kemble, Victoria, BC; Edwin Klimek, St. Catharines, Ont.; Ariane Mackey, Quebec City, Que.; Vance Makin, Vancouver, BC; Jeffrey Minuk, Montreal, Que.; James Perry, Toronto, Ont.; Marc Petitclerc, Quebec City, Que.; Stephen Phillips, Halifax, NS; Peter Seland, Kelowna, BC; Ashfaq Shuaib, Edmonton, Alta.; Denis Simard, Quebec City, Que.; Andrew Woolfenden, Vancouver, BC. Non-CSC collaborators: Drs. Werner Becker, Calgary, Alta.; Irvine Heinrichs, Calgary, Alta.; Kenneth Makus, Edmonton, Alta.; Stephen McKenzie, Toronto, Ont.; Robert Nelson, Ottawa, Ont.; Lise Prescott, Montreal, Que.; Antonio Tamayo, London, Ont.; Judith Tokar, St. Catharines, Ont.; Douglas Zochodne, Calgary, Alta.
We have performed a search for neutral Higgs bosons produced in association with bottom quarks in p (p) over bar collisions, using 260 pb(-1) of data collected with the D0 detector in Run II of the ...Fermilab Tevatron Collider. The cross sections for these processes are enhanced in many extensions of the standard model (SM), such as in its minimal supersymmetric extension at large tan beta. The results of our analysis agree with expectations from the SM, and we use our measurements to set upper limits on the production of neutral Higgs bosons in the mass range of 90 to 150 GeV.
We present a search for electroweak production of single top quarks in the s-channel and t-channel using neural networks for signal-background separation. We have analyzed 230 pb(-1) of data ...collected with the DO detector at the Fermilab Tevatron Collider at a center-of-mass energy of 1.96 TeV and find no evidence for a single top quark signal. The resulting 95% confidence level upper limits on the single top quark production cross sections are 6.4 pb in the s-channel and 5.0 ph in the t-channel.
We present a measurement of the top quark pair (t (t) over bar) production cross section (sigma(t (t) over bar)) in pp collisions at root s = 1.96 TeV using 230 pb(-1) of data collected by the DO ...experiment at the Fermilab Tevatron Collider. We select events with one charged lepton (electron or muon), missing transverse energy, and jets in the final state. We employ lifetime-based b-jet identification techniques to further enhance the t F purity of the selected sample. For a top quark mass of 175 GeV, we measure sigma(t (t) over bar) 8.6(-1.5)(+1.6) (stat. + syst.) +/- 0.6(lumi.) pb, in agreement with the standard model expectation.
We present a measurement of the top quark pair (t (t) over bar) production cross section (sigma(t (t) over bar)) in pp collisions at a center-of-mass energy of 1.96 TeV using 230 pb(-1) of data ...collected by the DO detector at the Fermilab Tevatron Collider. We select events with one charged lepton (electron or muon), large missing transverse energy, and at least four jets, and extract the t (t) over bar content of the sample based on the kinematic characteristics of the events. For a top quark mass of 175 GeV, we measure sigma(t (t) over bar) 6.7(-1.3)(+1.4)(stat)(-1.1)(+1.6)(syst) +/- 0.4(lumi) pb, in good agreement with the standard model prediction.
We present the first measurements at a hadron collider of differential cross sections for Z+jet+X production in delta phi(Z, jet), |delta y(Z, jet)| and |y_boost(Z, jet)|. Vector boson production in ...association with jets is an excellent probe of QCD and constitutes the main background to many small cross section processes, such as associated Higgs production. These measurements are crucial tests of the predictions of perturbative QCD and current event generators, which have varied success in describing the data. Using these measurements as inputs in tuning event generators will increase the experimental sensitivity to rare signals.
We report on a first search for resonant pair production of neutral long-lived particles (NLLP) which each decay to a bb pair, using 3.6 fb(-1) of data recorded with the D0 detector at the Fermilab ...Tevatron collider. We search for pairs of displaced vertices in the tracking detector at radii in the range 1.6-20 cm from the beam axis. No significant excess is observed above background, and upper limits are set on the production rate in a hidden-valley benchmark model for a range of Higgs boson masses and NLLP masses and lifetimes.
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