| 1. |
|
|
| 2. |
- Brenner, Richard, et al.
(författare)
-
The ATLAS tau trigger and planned trigger efficiency studies with early data
- 2009
-
Ingår i: Proceedings of CHarged2008. - Trieste : Proceedings of Science. ; , s. 1-7
-
Konferensbidrag (refereegranskat)abstract
- The tau trigger system of the ATLAS detector has been developed to increase the sensitivity ofthe detector to the Higgs boson and searches for physics beyond the Standard Model. A trigger system split in three levels has been designed for hadronically decaying tau leptons optimized for efficiency and good background rejection. At the first level the trigger uses only information from the calorimeters while the other two levels include also information from the tracking. Both energy and shape variables for the hadronic tau jets are used in the trigger algorithms. The very intense QCD background, however, makes it a challenge to develop an efficient trigger with high purity at low transverse momentum. Thus the tau trigger is best used in combination with other trigger variables such as missing transverse energy or jets. Before the tau trigger can be used in searches, it has to be commissioned with data and the efficiency and background rejectionof QCD has to be studied in detail.
|
|
| 3. |
- Casado, M. P., et al.
(författare)
-
The ATLAS tau trigger
- 2009
-
Ingår i: Nuclear physics B, Proceedings supplements. - : Elsevier BV. - 0920-5632 .- 1873-3832. ; 189, s. 291-298
-
Tidskriftsartikel (refereegranskat)abstract
- The implementation of a trigger for hadronically decaying tau leptons at the Large Hadronic Collider (LHC) is challenging due to the high background rate, on the other hand it increases tremendously the discovery potential of ATLAS in searches for Standard Model (SM) or Supersymmetric (SUSY) Higgs or other more exotic final states. In this paper we describe the ATLAS tau trigger system, focusing on the early data taking period, and present results from studies based oil GEANT 4 simulated events, including trigger rates and the acceptance of tau leptons from SM processes. In order to cope with the rate and optimize the efficiency of important physics channels, the results of the current simulation studies indicate that ATLAS tau triggers should include either relatively high transverse momentum single tau signatures, or low transverse momentum tau signatures in combination with other signatures, such as missing transverse energy, leptons, or jets.
|
|
| 4. |
- Demers, C., et al.
(författare)
-
Impact of candesartan on nonfatal myocardial infarction and cardiovascular death in patients with heart failure
- 2005
-
Ingår i: JAMA. - 1538-3598. ; 294:14, s. 1794-8
-
Forskningsöversikt (refereegranskat)abstract
- CONTEXT: Angiotensin-converting enzyme (ACE) inhibitors reduce the risk of myocardial infarction (MI), but it is not known whether angiotensin receptor blockers have the same effect. OBJECTIVE: To assess the impact of the angiotensin receptor blocker candesartan on MI and other coronary events in patients with heart failure. DESIGN, SETTING, AND PARTICIPANTS: The Candesartan in Heart Failure: Assessment of Reduction in Mortality and Morbidity (CHARM) program, a randomized, placebo-controlled study enrolling patients (mean age, 66 [SD, 11] years) with New York Heart Association class II to IV symptoms who were randomly allocated to receive candesartan (target dose, 32 mg once daily) or matching placebo given in addition to optimal therapy for heart failure. Patients were enrolled from March 1999 through March 2001. Of 7599 patients allocated, 4004 (53%) had experienced a previous MI, and 1808 (24%) currently had angina. At baseline, 3125 (41%) were receiving an ACE inhibitor; 4203 (55%), a beta-blocker; 3153 (42%), a lipid-lowering drug; 4246 (56%), aspirin; and 6286 (83%), a diuretic. MAIN OUTCOME MEASURE: The primary outcome of the present analysis was the composite of cardiovascular death or nonfatal MI in patients with heart failure receiving candesartan or placebo. RESULTS: During the median follow-up of 37.7 months, the primary outcome of cardiovascular death or nonfatal MI was significantly reduced in the candesartan group (775 patients [20.4%]) vs the placebo group (868 [22.9%]) (hazard ratio [HR], 0.87; 95% confidence interval [CI], 0.79-0.96; P = .004; number needed to treat [NNT], 40). Nonfatal MI alone was also significantly reduced in the candesartan group (116 [3.1%]) vs the placebo group (148 [3.9%]) (HR, 0.77; 95% CI, 0.60-0.98; P = .03; NNT, 118). The secondary outcome of fatal MI, sudden death, or nonfatal MI was significantly reduced with candesartan (459 [12.1%]) vs placebo (522 [13.8%]) (HR, 0.86; 95% CI, 0.75-0.97; P = .02; NNT, 59). Risk reductions in cardiovascular death or nonfatal MI were similar across predetermined subgroups and the component CHARM trials. There was no impact on hospitalizations for unstable angina or coronary revascularization procedures with candesartan. CONCLUSION: In patients with heart failure, candesartan significantly reduces the risk of the composite outcome of cardiovascular death or nonfatal MI.
|
|
| 5. |
- Locat, Ariane, et al.
(författare)
-
Study of a lateral spread failure in an eastern Canada clay deposit in relation with progressive failure : the Saint Barnabé-Nord slide
- 2008
-
Ingår i: Proceedings of the 4th Canadian Conference on Geohazards. - : Presse de l'Université Laval. - 9782978763781 ; , s. 89-95
-
Konferensbidrag (refereegranskat)abstract
- A review of the concept of progressive failure in the context of slope stability and an application of this concept to a spread failure in an eastern Canada clay deposit have been made in the search of a better understanding of the role of progressive failure in this type of mass movement. The study led to the identification of two failure modes for lateral spread failures. In the first one, the disturbing agent is located up slope (e.g. presence of a fill on top of the slope) resulting in an increase of earth pressure and possibly entailing a passive failure. In the second one, the disturbing agent is located down slope (e.g. river erosion at the toe of a slope) causing a decrease of earth pressure and possibly an acctive failure. The application of progressive failure to a lateral spread failure in clay has therefore enabled the development of new ideas regarding the failure mechanism in large landslides where limit equilibrium stability analysis is not applicable.
|
|
