Rare B decays and processes with the ATLAS detector

We present rare B decays and processes measured with the ATLAS detector. First, the associated production of vector boson + prompt J/ψ that is a key process for understanding of quarkonium production mechanisms, and second, the rare B 0 s → µ + µ − decay, that due to its small branching fraction, is an excellent probe for physics beyond the standard model.

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