Evidence is reported for a narrow structure near the $J/\psi\phi$ threshold in exclusive $B^+\to J/\psi\phi K^+$ decays produced in $\bar{p} p $ collisions at $\sqrt{s}=1.96 \TeV$. A signal of ...$14\pm5$ events, with statistical significance in excess of 3.8 standard deviations, is observed in a data sample corresponding to an integrated luminosity of $2.7 \ifb$, collected by the CDF II detector. The mass and natural width of the structure are measured to be $4143.0\pm2.9(\mathrm{stat})\pm1.2(\mathrm{syst}) \MeVcc$ and $11.7^{+8.3}_{-5.0}(\mathrm{stat})\pm3.7(\mathrm{syst}) \MeVcc$.
Islanding is one of the challenging task for micro grid system. There are various types of islanding methods. Local Methods also classified as passive, active and hybrid method. Passive islanding ...methods are easy to execute, cheaper for multi DG system but have large non detection zone (NDZ). A very few active and hybrid methods were tested on multi DG system till now. In this paper, a new method is proposed for DGs connected in parallel considering recursive least square algorithm (RLS) at point of common coupling (PCC) for islanding. There are various parameters like voltage, current, frequency, impedance, harmonics etc used to detect the islanding. Here a frequency of active frequency drift (AFD) current with RLS is considered as variable parameter. Further comparative analysis done between conventional active and passive methods with proposed method. In a proposed method a variation of estimated frequency signal generates the tripping signal in fast manner as compare to other methods. The simulation results are analysed based on MATLAB software and verified the same by implementing prototype hardware experimental setup. The analysis shows that estimation of frequency for current of AFD with RLS approach is more suitable for islanding during zero power mismatch condition.
We report the observation of B{sub s}{sup 0}-B{sub s}{sup 0} oscillations from a time-dependent measurement of the B{sub s}{sup 0}-B{sub s}{sup 0} oscillation frequency {delta}m{sub s}. Using a data ...sample of 1 fb{sup -1} of pp collisions at {radical}(s)=1.96 TeV collected with the CDF II detector at the Fermilab Tevatron, we find signals of 5600 fully reconstructed hadronic B{sub s} decays, 3100 partially reconstructed hadronic B{sub s} decays, and 61 500 partially reconstructed semileptonic B{sub s} decays. We measure the probability as a function of proper decay time that the B{sub s} decays with the same, or opposite, flavor as the flavor at production, and we find a signal for B{sub s}{sup 0}-B{sub s}{sup 0} oscillations. The probability that random fluctuations could produce a comparable signal is 8x10{sup -8}, which exceeds 5{sigma} significance. We measure {delta}m{sub s}=17.77{+-}0.10(stat){+-}0.07(syst) ps{sup -1} and extract vertical bar V{sub td}/V{sub ts} vertical bar =0.2060{+-}0.0007({delta}m{sub s}){sub -0.0060}{sup +0.0081}({delta}m{sub d}+theor)
Measurement of the K L Charge Asymmetry Alavi-Harati, A.; Alexopoulos, T.; Arenton, M. ...
Physical review letters,
05/2002, Letnik:
88, Številka:
18
Journal Article
PDF
