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In nuclear beta decay an up quark ‘u’ in a proton converts into an up down quark ‘d,’ turning the proton into a neutron and emitting a positron and a neutrino. This work affects interpretation of beta decay measurements across the chart of nuclides.

New Precise Calculation of Nuclear Beta Decays Paves the Way to Uncover Physics Beyond the Standard Model

Theorists identify new effects needed to compute the nuclear beta decay rate with a precision of a few parts in ten thousand.

A depiction of proposed four-quark structures and their sizes relative to the proton. The labels u and c represent the up and charm quarks, respectively, while the labels u and c with bars indicate the corresponding antiquarks.

Can Four-Quark States Arise from Inside the Proton Itself?

Theoretical calculations suggest charm tetraquarks may be less compact than previously thought.

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