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Asymmetric muon-antimuon emission from $Z^0$ decays: a clear magnetometer in relativistic heavy-ion collisions
Alejandro Ayala, Ana Julia Mizher, Javier Rend\'on
https://arxiv.org/abs/2506.11370

Asymmetric muon-antimuon emission from $Z^0$ decays: a clear magnetometer in relativistic heavy-ion collisions
We show that a very clear signal of the presence of a strong magnetic field during the early stage of a high-energy heavy-ion collision is provided by the decay of the Z^0 into dimuon pairs. We find that the process is highly anisotropic, producing pairs mainly out of plane, as signaled by a negative value of v_2, and leads to a harder antimuon transverse momentum spectrum, compared with that of the muon transverse momentum spectrum. We also show that the process does not produce a significant …