First Measurement of Form Factors of the Decay Xi0->Sigma+ e- anti-nu/e

Details First Measurement of Form Factors of the Decay Xi0->Sigma+ e- anti-nu/e First Measurement of Form Factors of the Decay Xi0->Sigma+ e- anti-nu/e

2001-05-10

arxiv.org/abs/hep-ex/0105016v1

Phys.Rev.Lett.87:132001,2001

Physics

High Energy Physics

High Energy Physics - Experiment

Submitted to Physical Review Letters, 5 pages, 4 figures

Scientific paper

10.1103/PhysRevLett.87.132001

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 Xi0 -> Sigma+ e- anti-nu/e using the KTeV (E799) beam line and detector at Fermilab. From the Sigma+ polarization measured with the decay Sigma+ -> p pi0 and the e- - anti-nu/e correlation, we measure g1/f1 to be 1.32 +0.21-0.17(stat.) +/- 0.05(syst.), assuming the SU(3)f (flavor) values for g2/f1 and f2/f1. Our results are all consistent with exact SU(3)f symmetry.

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