Crashing debut of an exotic heavy particle? (frequency of positron-proton collisions indicates existence of particles or forces that are not part of standard model of particle physics)(Brief Article)

From: Science News | Date: March 8, 1997| Author: | Copyright information

A high-speed positron, the antimatter counterpart of an electron, smashes head-on into an onrushing proton. It penetrates the particle, striking one of the proton's constituent quarks; then, picking up an enormous amount of momentum from the struck quark, it rebounds nearly straight back.

Such spectacular events are rare among the thousands of positron-proton collisions monitored at the HERA particle accelerator in Hamburg, Germany. Most of the time, the particles either miss or merely glance off each other.

Nonetheless, collisions in which positrons are sharply deflected seem ...

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