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International Journal of High-Energy Physics

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Digital edition

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CERN Courier: October 1999

Cover of CERN Courier Volume 39 Issue 8

Astrowatch

Astrowatch

Edited by Emma Sanders

Features

200 GeV achieved for 2000

In the last 10 years electroweak, physics has been transformed from a subtle effect into big science. At the forefront of this effort has been CERN's LEP electron­positron collider, which is now celebrating its tenth birthday.

From Z to ZZ - a decade of electroweak precision

After having carefully amassed some 18 million Z particles one by one over 10 years, the experiments at CERN's LEP electron­positron collider are now producing Zs in pairs.

Neutrino physics gains weight

Neutrinos are always compelling physics. The neutrino sessions at this year's International Lepton-Photon Symposium at Stanford gave an up-to-date snapshot.

A good BaBar gain

The dedication of the BaBar detector for the recently commissioned PEP-II B-factory at SLAC, Stanford, showed the increased international aspect of US particle physics.

Physicists focus on quest for Bs

The physics of B particles is a major new focus of world particle physics research. A session at the recent lepton-photon symposium provided a useful overview.

Why does CP violation matter to the universe?

The seemingly obscure phenomenon of CP violation is increasingly being viewed as the key to a deeper understanding of both the behaviour of elementary particles and the Big Bang origin of the universe. Here, John Ellis of CERN explains how far and how deep the implications of CP violation extend.

Looking at cosmic rays with accelerator detectors

Large detectors constructed at accelerator labs can also be used in parallel for cosmic-ray studies. Effects measured in distant detectors could be correlated to provide a broader view of particles from the cosmos.

ALEPH experiments go cosmic

After analysing cosmic muon events, five were found with the highest muon density ever seen.Designed to study man-made electron­positron collisions in CERN's LEP ring, the ALEPH detector is also ideal for observing complicated natural cosmic-ray events.

L3+C = new tool set to study cosmic-ray muons

Also under way at CERN is the L3 experiment at LEP, which has installed a 200 sq. m screen of scintillator to intercept comic rays arriving from the atmosphere.