isospin

noun

iso·spin ˈī-sə-ˌspin

: a quantum characteristic of a group of closely related subatomic particles (such as a proton and a neutron) handled mathematically like ordinary spin with the possible orientations in a hypothetical space specifying the number of particles of differing electric charge comprising the group

called also isotopic spin

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In theory, the amplitudes should obey certain relations that apply to the Standard Model, like isospin symmetry, but — as the LHCb collaboration has concluded — measurements show our observations to be inconsistent with those expectations. —