Feasibility studies for the measurement of time-like proton electromagnetic form factors from p¯ p→ μ+μ- at P ¯ ANDA at FAIR

This paper reports on Monte Carlo simulation results for future measurements of the moduli of time-like proton electromagnetic form factors, | GE| and | GM| , using the p¯ p→ μ+μ- reaction at P ¯ ANDA (FAIR). The electromagnetic form factors are fundamental quantities parameterizing the electric and magnetic structure of hadrons. This work estimates the statistical and total accuracy with which the form factors can be measured at P ¯ ANDA , using an analysis of simulated data within the PandaRoot software framework. The most crucial background channel is p¯ p→ π+π-, due to the very similar behavior of muons and pions in the detector. The suppression factors are evaluated for this and all other relevant background channels at different values of antiproton beam momentum. The signal/background separation is based on a multivariate analysis, using the Boosted Decision Trees method. An expected background subtraction is included in this study, based on realistic angular distributions of the background contribution. Systematic uncertainties are considered and the relative total uncertainties of the form factor measurements are presented

Report of the 2-nd Meeting of SCOR Working Group 36 on Coastal Upwelling Processes

Fedorov, K.N. ... et al.-- Report of the 2-nd Meeting of Scientific Committee on Oceanic Research (SCOR) Working Group 36 - International Council of Scientific Unions on Coastal Upwelling Processes,, 24-28 June 1974, Kiel, Federal Republic of Germany.-- 17 pagesPeer reviewe

Report of the 3rd Meeting of SCOR Working Group 36 on Coastal and Equatorial Upwelling Processes

Fedorov, K.N. ... et al.-- Report of the 3rd Meeting of Scientific Committee on Oceanic Research (SCOR) Working Group 36 - International Council of Scientific Unions on Coastal and Equatorial Upwelling Processes, 8-11 September 1975, Paris.-- 16 pagesPeer reviewe

ON THE MECHANISM OF GLOW DISCHARGE INSTABILITY FOLLOWING THE TURN-OFF A NON-SELF-SUSTAINED IONIZATION SOURCE

Instabilities in a non-self-sustained glow discharge which develop when external ionisation pulse is applied have been discussed earlier is many works. According to the present dominating point of vievr this instability is associated with the growth of the value of self-sustained ionization function. Heating are rarefaction of gas play an important role in this case

INVESTIGATIONS OF INSTABILITIES IN A NON-SELF-SUSTAINED REPETITIVELY PULSED DISCHARGE

Non-self-sustained discharges are known to be unstable. Instabilities which limit the maximum energy input in pulsed modes of operation may develop in different ways. At asufficiently high discharge voltage an instability which occurs during a current pulse can be observed. The mechanism of this instability has already been studied in detail. At 1ower discharge voltages instability may develop vihen the external source of ionization has been turned off. As a result the discharge voltage should be decreased fuather. This leads to a reduced energy input per pulse in a CO2 repetitively pulsed laser when the frequency is high or the gas velocity is small [1, 2]