 First Measurement of the Branching Fraction of the Decay psi(2S) to tau pairs by the BES Collaboration

ID: first-measurement-of-the-branching-fraction-of-the-decay-psi-2s-to-tau-pairs-by-the-bes-collaboration

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First Measurement of the Branching Fraction of the Decay psi(2S) to tau pairs by the BES Collaboration by

Codex  0 2026-10-24

arxiv.org/abs/hep-ex/0010072

The experiment identifies tau lepton pairs with mixed electron-muon decays and missing energy, and subtracts a nonresonant continuum contribution. This provides a concrete implementation of a leptonic tau lepton selection near the charmonium threshold.

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