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International Journal of High-Energy Physics

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Digital edition

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CERN Courier: April 1999

Cover of CERN Courier Volume 39 Issue 3

Astrowatch

Astrowatch

Edited by Emma Sanders

Features

Superstrings, black holes and gauge theories

Finding a quantum field theory that includes gravity has eluded the best minds of physics. Yaron Oz of CERN explains how the theory of superstrings modifies classical geometry, and how the secrets of quantum black holes are encoded in quantum field theories. Remarkable new developments show how physical field theories, such as that of quarks and gluons, can be related to gravity in higher dimensions.

Linear collider physics: the next challenge

While CERN's LHC proton collider is the world's major particle physics project, other avenues of research could yield complementary studies. Here, David Miller looks at the possibilities for a linear electron­positron collider.

KamLAND: neutrinos from heaven and Earth

The Japanese Kamiokande underground detector played a leading role in the study of neutrinos produced via cosmic rays and also helped to pioneer the subject of neutrino astronomy. With Kamiokande now having given way to Superkamiokande, the Kamioka mine becomes the scene of a new neutrino project.

Raising the dead detectors

The RD39 collaboration at CERN investigates heavily irradiated silicon detectors operated at cryogenic temperatures. Its results show that, below 100 K, such detectors can be brought back to life. This phenomenon has been dubbed the Lazarus effect after the Biblical character who was raised from the dead by Jesus after being entombed for four days.

Perfect rose

The Rose collaboration (RD48: R&D on silicon for future experiments) at CERN has tackled the same problem as RD39, from a different angle but with similar success. Its approach is "defect engineering": the careful control of impurities ­ particularly carbon and oxygen ­ in the silicon lattice.

Probing the pomeron

What ultimately controls the way particles interact? Different particles appear to interact at high energies in similar ways through a mechanism known as pomeron exchange. Sandy Donnachie explains what we know about the pomeron.

Silicon detectors: pushing up daisies or coming up roses?

Silicon strips and pixels are detectors of choice for front-line tracking applications in particle physics, but today's silicon devices will be hard pushed in the harsh environment of CERN's forthcoming Large Hadron Collider. Two groups have found promising solutions for keeping silicon at the forefront of tracking technology.