First measurement of form factors of the decay Ξ0 → Σ+ e ν¯e

KTeV Collaboration

Research output: Contribution to journalArticlepeer-review


We present the first measurement of the form factor ratios g1/f1 (direct axial vector to vector), g2/f1 (second class current), and f2/f1 (weak magnetism) for the decay Ξ0 → Σ+ e ν¯e using the KTeV (E799) beam line and detector at Fermilab. From the Σ+ polarization measured with the decay Σ+0 and the e − ν¯ correlation, we measure g1/f1 to be 1.32 ±0.210.17 (stat) ± 0.05 (syst), ssuming the SU (3)f (flavor) values for g2/f1 and f2 / f1. Our results are all consistent with exact SU (3)f symmetry.

Original languageEnglish (US)
Pages (from-to)132001-1-132001-4
JournalPhysical review letters
Issue number13
StatePublished - Sep 24 2001

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)


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