The diphoton production rate in {bar p}p collisions at {radical}s = 1800 GeV

Abstract

A measurement of the rate of prompt diphoton production in jjp collisions at fi = 1800 GeV using the CDF detector is presented. The background from non-prompt sources is estimated using a sample of single photon candidate events. The results are compared to a next-to-leading order calculation by Bailey, et al. Both background and signal take on particular significance as an indicator of our ability to estimate the backgrounds affecting LHC low mass Higgs to diphoton searches.

Pneumatic Osteolysis in the Elephant Skull

“…The elephant skull undergoes pneumatisation to an extraordinary, possibly unique, degree, an anatomical character which has received notice in all general works on elephant morphology. The functional significance of this pneumatisation (the achievement of lightness in a cranium inevitably rendered huge by considerations of tusk-bearing and muscle attachment) was correctly assessed by such early writers as (Moulin, 1682;Blair, 1710;Perrault, 1734;Camper, 1802) as well a5 by such later authorities as Owen (1866) and Flower (1885). Flower improved on previous accounts by enumerating the cranial bones pneumatised (which include vomer and mesethmoid) and his enumeration is retained in recent works (e.g.…”

Controlled Auto-Ignition Combustion in a Two-Stroke Cycle Engine Using Hot Burned Gases

“…The second one is fuel short circuit at medium and full load. However due to the short-circuiting of the fuel before combustion, this has resulted in deterioration in overall performances especially poor combustion efficiency and high white smoke emission problem [2].…”