Observation of the Z → ψ ℓ + ℓ - decay in pp collisions at v s = 13 TeV
This Letter presents the observation of the rare Z boson decay Z→ ψ ℓ + ℓ − . Here, ψ represents contributions from direct J/ψ and ψ ( 2 S ) → J / ψ X , ℓ + ℓ − is a pair of electrons or muons, and the J/ψ meson is detected via its decay to μ + μ − . The sample of proton-proton collision data, colle...
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| Format: | Article |
| Language: | English |
| Published: |
American Physical Society,
2020-04-24T17:44:51Z.
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| Online Access: | Get fulltext |