Particle Physics

p.15 E. Braaten, C.S. Li, T.C. Yuan, "The evolution of Weinberg's gluonic CP-Violation operator," Physical Review Letters, 64:1709-12, 1990. Eric Braaten (Northwestern University, Evanston, Ill.): "A great mystery in elementary particle physics is the existence of an extremely weak force that is not invariant under reversing the direction of time. In 1989, Steven Weinberg proposed a new mechanism for producing violations of time reversal (or CP) symmetry [Physical Review Letters, 63:2333-6].


Register for free to listen to this article
Listen with Speechify
0:00
1:00
Share

p.15

E. Braaten, C.S. Li, T.C. Yuan, "The evolution of Weinberg's gluonic CP-Violation operator," Physical Review Letters, 64:1709-12, 1990.

Eric Braaten (Northwestern University, Evanston, Ill.): "A great mystery in elementary particle physics is the existence of an extremely weak force that is not invariant under reversing the direction of time. In 1989, Steven Weinberg proposed a new mechanism for producing violations of time reversal (or CP) symmetry [Physical Review Letters, 63:2333-6]. He showed that particles too heavy to have been produced in the lab could induce a time reversal-violating interaction among gluons. This could be detected experimentally, because it would generate a tiny electric dipole moment for the neutron. We calculated precisely the low-energy gluon interaction that would be induced by the heavy particles. The interaction turned out to be several orders of magnitude weaker than previously believed. Extremely sensitive measurements of the neutron electric dipole moment are now being ...

Interested in reading more?

Become a Member of

The Scientist Logo
Receive full access to digital editions of The Scientist, as well as TS Digest, feature stories, more than 35 years of archives, and much more!
Already a member? Login Here
Image of a woman in a microbiology lab whose hair is caught on fire from a Bunsen burner.
April 1, 2025, Issue 1

Bunsen Burners and Bad Hair Days

Lab safety rules dictate that one must tie back long hair. Rosemarie Hansen learned the hard way when an open flame turned her locks into a lesson.

View this Issue
Faster Fluid Measurements for Formulation Development

Meet Honeybun and Breeze Through Viscometry in Formulation Development

Unchained Labs
Conceptual image of biochemical laboratory sample preparation showing glassware and chemical formulas in the foreground and a scientist holding a pipette in the background.

Taking the Guesswork Out of Quality Control Standards

sartorius logo
An illustration of PFAS bubbles in front of a blue sky with clouds.

PFAS: The Forever Chemicals

sartorius logo
Unlocking the Unattainable in Gene Construction

Unlocking the Unattainable in Gene Construction

dna-script-primarylogo-digital

Products

Atelerix

Atelerix signs exclusive agreement with MineBio to establish distribution channel for non-cryogenic cell preservation solutions in China

Green Cooling

Thermo Scientific™ Centrifuges with GreenCool Technology

Thermo Fisher Logo
Singleron Avatar

Singleron Biotechnologies and Hamilton Bonaduz AG Announce the Launch of Tensor to Advance Single Cell Sequencing Automation

Zymo Research Logo

Zymo Research Launches Research Grant to Empower Mapping the RNome