The Electric Dipole Moment Challenge

The Electric Dipole Moment Challenge

Richard Talman
ISBN: 9781681745084 | PDF ISBN: 9781681745091
Copyright © 2017 | 183 Pages | Publication Date: May, 2017

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With the Higgs particle just confirmed, a remaining blemish of the standard model of elementary particle physics is the excess of particles over antiparticles in the present-day universe, which could be due the existence of symmetry violation much greater than is currently accepted. Such a symmetry violation would be expected also to imply non-vanishing electric dipole moments (EDMs) for elementary particles such as the proton. Currently only EDM upper limits have been established. This book explains the "electric dipole moment challenge" which is to measure a non-zero proton EDM value and suggest how the challenge can be met. Any measurably large proton EDM would violate the standard model. The method to be employed uses an intense beam of "frozen spin" protons circulating for hour-long times in a storage ring "trap". It is the smallness of EDMs that allows them to test existing theories, but also what makes them hard to measure. Such EDM experiments are inexpensive, at least compared to building accelerators of ever-greater energy.

Table of Contents

Symmetry, physical laws, and electric dipole moments
Some essential experiments
Magnetic precessions
Just enough accelerator physics
All-electric particle dynamics
The all-electric Brookhaven electron storage ring
A self-magnetometer storage ring
Frequency domain EDM experiment design
The Bargmann–Michel–Telegdi equation
Relativistic Stern—Gerlach Deflection

About the Author(s)

Richard Talman, Cornell University (Emeritus)
Richard Talman is Professor Emeritus in the Department of Physics, Cornell University. He received his PhD in 1963 from the California Institute of Technology. His recent efforts have been devoted to planning for a new generation of accelerators following the LHC p,p collider at CERN He has also been developing a method for measuring the electric dipole moments (EDM) of the electron and proton. His multiple visiting appointments include Stanford, CERN, UC Berkeley, University of Chicago, University of Texas at Austin, Duke, and many more.

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