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Highs and lows of heavy neutrinos.

Experiments hinting at the existence of a type of neutrino with a mass of 17 kiloelectron-volts -- significantly greater than most theorists had anticipated -- have prompted a great deal of addition experimental work and much theoretical speculation (SN: 4/27/91, p.260). But evidence to date -- with many other experiments in progress -- remains equivocal.

"We have the very uncomfortable situation that both the positive and the negative experiments are getting better," comments David O. Caldwell of the University of California, Santa Barbara. "it's a great mystery at this point."

Stay tuned.
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Title Annotation:17 kiloelectron-volt mass
Author:Peterson, Ivars
Publication:Science News
Article Type:Brief Article
Date:May 2, 1992
Words:91
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