Charged kaons produce more

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isospin symmetry

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isospin asymmetry

Phys Org

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Science

Symmetry between up and down quarks is more broken than expected

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89% Informative

CERN 's NA61/SHINE experiment found an imbalance between charged and neutral kaons in argonscandium collisions.

This suggests the so-called "isospin symmetry" between up and down quarks might be broken by more than expected due to the differences in their electric charges and masses.

Known sources of isospin asymmetry only predict deviations of a few percent .

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