Measurement of the eta and etaprime transition form factors at q^2=112 GeV^2

TL;DR

This study measures the transition form factors of eta and etaprime mesons at a high momentum transfer using e+e- collision data, providing new experimental insights into their electromagnetic structure.

Contribution

First measurement of eta and etaprime transition form factors at q^2=112 GeV^2 using e+e- collision data from BABAR.

Findings

Measured cross sections for e+e- -> eta gamma and etaprime gamma.

Determined the transition form factors at q^2=112 GeV^2 for eta and etaprime.

Observed signals with small backgrounds for both processes.

Abstract

We report a study of the processes e+e- -> eta gamma and e+e- -> etaprime gamma at a center-of-mass energy of 10.58 GeV, using a 232 fb^-1 data sample collected with the BABAR detector at the PEP-II collider at SLAC. We observe 20+6-5 eta gamma and 50+8-7 etaprime gamma events over small backgrounds, and measure the cross sections sigma(e+e- -> eta gamma) =4.5+1.2-1.1(stat)+-0.3(sys) fb and sigma(e+e- -> etaprime gamma)=5.4+-0.8(stat)+-0.3(sys) fb. The corresponding transition form factors at q^2 = 112 GeV^2 are q^2|F_eta(q^2)|=0.229+-0.030+-0.008 GeV, and q^2|F_etaprime(q^2)|=0.251+-0.019+-0.008 GeV, respectively.