The exclusive and semi-exclusive branching ratios of the τ lepton hadronic decay modes (, , , , , , , , and ) were measured with data from the DELPHI detector at LEP.
Total contractility reserve (TCR) and role of TCR in prediction of dilated cardiomyopathy (DCM) were evaluated in patients with infectious allergic myocarditis (IAM) by means of ...stress-echocardiography with dobutamine. Systolic function of the left ventricle (LV) appeared activated in different degree in relatively equal baseline low levels of LV contractility. IAM patients with reduced reserve of TCR are characterized by low increment of LV contractility under stress test and frequent onset of DCM. The increment of ejection fraction in low-dose dobutamine stress echocardiography was found informative in prediction of DCM development, highly sensitive and specific.
The effect of long-term atenolol therapy on the structural and functional parameters of the left-ventricular (LV) myocardium was studied in patients with dilatational cardiomyopathy by means of ...echocardiography. Six-months treatment with atenolol improved the clinical status and reduced the degree of LV dilatation in patients with circulatory insufficiency of functional classes I and II. The contractility parameters (ejection fraction and delta S) increased in patients of all functional classes but more markedly in those of functional classes I and II. The effect of atenolol on the transmitral diastolic flow in patients with the initial stages of chronic circulatory insufficiency was characterized by the absence of changes in the flow rate during the period of rapid filling and a significant lowering of the atrial peak, which corresponded to improvement in the patients' status.
A precise measurement of the tau lifetime Abdallah, J.; Abreu, P.; Adam, W. ...
The European physical journal. C, Particles and fields,
08/2004, Letnik:
36, Številka:
3
Journal Article
Recenzirano
Odprti dostop
The tau lepton lifetime has been measured with the \({\rm e}^ + {\rm e}^- \rightarrow {\rm\tau}^ + {\rm\tau}^-\) events collected by the DELPHI detector at LEP in the years 1991-1995. Three different ...methods have been exploited, using both one-prong and three-prong \(\tau\) decay channels. Two measurements have been made using events in which both taus decay to a single charged particle. Combining these measurements gave \(\tau_\tau \mbox{(1 prong)} = 291.8\pm 2.3_{\mathrm{stat}} \pm 1.5_{\mathrm{sys}} \mathrm{fs}\). A third measurement using taus which decayed to three charged particles yielded \(\tau_\tau \mbox{(3 prong)} = 288.6\pm 2.4_{\mathrm{stat}} \pm 1.3_{\mathrm{sys}} \mathrm{fs}. \) These were combined with previous DELPHI results to measure the tau lifetime, using the full LEP1 data sample, to be \(\tau_\tau = 290.9\pm 1.4_{\mathrm{stat}} \pm 1.0_{\mathrm{sys}} \mathrm{fs}\).
Echocardiographic investigation of the defects in left ventricular systolic and diastolic functions was made in patients at different stages of dilated cardiomyopathy (DC). The established ...clinico-echocardiographic parallels demonstrate that noticeable dilation of the left ventricle appears as early as initial DC when systolic function is still unchanged. Early DC stages are characterized by left ventricular dysfunction presenting as enhanced blood filling in atrial systole. Progression of circulatory insufficiency brought about the "pseudonormal" pattern with intensive blood flow in early diastole.
Pathologic myocardial changes in is one of the main causes of death in patients with terminal chronic renal failure (CRF). The authors studied structural and functional condition of the myocardium ...and the effect of various CRF factors on cardiovascular complications. The study demonstrates positive correlation between systolic arterial pressure (AP) and left ventricular (LV) remodeling, as well as between the degree of anemia and LV remodeling in patients with CRF on program hemodialysis. Concentric LV hypertrophy (LVH) was revealed in 24 (65%) patients, eccentric LVH--in 7 (19%) patients. The results show that eccentric LVH with reduced ejection fraction in CRF patients on hemodialysis is associated with high systolic and pulse pressure.
Thyrotoxicosis often affects cardiovascular system. Structural-functional condition of the myocardium is essential in the outcome of surgical intervention on the thyroid in thyrotoxicosis and ...indicates effectiveness of the treatment. A comparative trial studied the effects of beta-blockers (anaprilin and carvedilol) on preoperative condition of left-ventricular (LV) myocardium and late after subtotal resection of the thyroid gland. 27 thyrotoxicosis patients with myocardial remodeling in the form of concentric LV hypertrophy entered the trial. Though in preoperative preparation anapriline is recommended, in postoperative period it is better to use carvedilol as it has a good effect on reverse development of myocardial remodeling and hemodynamics in view of its balanced beta- and alpha-adrenoblocking action.
An update of the searches for charginos and neutralinos in DELPHI is presented, based mainly on recent data collected at centre-of-mass energies of 161 GeV and 172 GeV. No signal is found. For a ...sneutrino with mass above 300 GeV/c2 and a mass difference between the chargino and the lightest neutralino above 10 GeV/c2, the lower limit at 95% confidence level on the chargino mass ranges from 84.3 GeV/c2 to the kinematical limit (86.0 GeV/c2), depending on the mixing parameters. The limit decreases for lower chargino-neutralino mass differences. The limit in the case of a light sneutrino is 67.6 GeV/c2, provided that that there is no light sneutrino with a mass within 10 GeV/c2 below the chargino mass. Upper limits on neutralino pair production cross-sections of about a picobarn are derived. The (μ,M2) domain excluded in the MSSM-GUT scenario is determined by combining the neutralino and chargino searches. These results imply a limit on the mass of the lightest neutralino which, for a heavy sneutrino, is constrained to be above 24.9 GeV/c2 for tanß >- 1. The search has also been extended to the case where the lightest neutralino is unstable and decays into a photon and a gravitino. imply a limit on the mass of the lightest neutralino which, for a heavy sneutrino, is constrained to be above 24.9 GeV/c2 for tanß >- 1. The search has also been extended to the case where the lightest neutralino is unstable and decays into a photon and a gravitino.
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