Low-energy particle events and solar filament eruptions
Over the period from August 1978 to October 1982, several large low-energy (E < 1.6 Mev) proton events associated with interplanetary travelling disturbances observed at 1 AU by ISEE-3, appeared not to be triggered by solar flares. Six of them can be associated with filament eruptions as the source of the disturbances. We have made a comparative study of the particle fluxes in the interplanetary medium, as well as of the available H-alpha observations and X-ray and radio emission, between these events and those associated with disturbances generated by solar flares.
The dependence of the differential cross section ${\mathrm{d}\sigma}/{\mathrm{d}p_{\perp}}$ of inclusive heavy quark production in pp and $\bar{\mathrm{p}}$p collisions on the renormalization and factorization scales is investigated. The implications of our results for experiments at TEVATRON and LHC are discussed. In particular, it is shown that the NLO QCD predictions for $\bar{t}t$ production at the LHC based on the Principle of Minimal Sensitivity are by 30-50% higher than the standard ones.