Sea quark surprise reveals deeper complexity in proton spin puzzle

New data from the STAR experiment at the Relativistic Heavy Ion Collider (RHIC) add detail—and complexity—to an intriguing puzzle that scientists have been seeking to solve: how the building blocks that make up a proton contribute to its spin. The results, just published as a rapid communication in the journal Physical Review D, reveal definitively for the first time that different "flavors" of antiquarks contribute differently to the proton's overall spin—and in a way that's opposite to those flavors' relative abundance.

Synopsis: Putting the Proton Radius in Its Proper Place

An analysis of the proton radius puzzle helps to define what the proton radius really means.[Physics] Published Thu Mar 07, 2019

Thu 14 Mar 19 from APS Physics

Research elucidates why protons are at the heart of atoms spin

A major new finding about the fundamental structure of all matter has just been published. The research stems from an analysis of data produced by an experiment in polarized proton-proton collisions. ...

Thu 21 Mar 19 from ScienceDaily

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