Physics and Astronomy

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Browsing Physics and Astronomy by Author "Abouzaid, E."

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    Measurement of the branching ratio of π0 Dalitz decay using KL→π0π0π0 decays
    (American Physical Society, 2019) Abouzaid, E.; Arenton, M.; Barker, A.R.; Bellantoni, L.; Blucher, E.; Bock, G.J.; Cheu, E.; Coleman, R.; Corcoran, M.D.; Cox, B.; Erwin, A.R.; Escobar, C.O.; Glazov, A.; Golossanov, A.; Gomes, R.A.; Gouffon, P.; Hsiung, Y.B.; Jensen, D.A.; Kessler, R.; Kotera, K.; Ledovskoy, A.; McBride, P.L.; Monnier, E.; Nguyen, H.; Niclasen, R.; Phillips, D.G.; Ramberg, E.J.; Ray, R.E.; Ronquest, M.; Santos, E.; Slater, W.; Smith, D.; Solomey, N.; Swallow, E.C.; Toale, P.A.; Tschirhart, R.; Wah, Y.W.; Wang, J.; White, H.B.; Whitmore, J.; Wilking, M.J.; Winstein, B.; Winston, R.; Worcester, E.T.; Yamanaka, T.; Zimmerman, E.D.; Zukanovich, R.F.
    We present a measurement of B(π0→e+e−γ)/B(π0→γγ), the Dalitz branching ratio, using data taken in 1999 by the E832 KTeV experiment at Fermi National Accelerator Laboratory. We use neutral pions from fully reconstructed KL decays in flight; the measurement is based on ∼60 thousand KL→π0π0π0→γγγγe+e−γ decays. We normalize to KL→π0π0π0→6γ decays. We find B(π0→e+e−γ)/B(π0→γγ) (me+e−>15 MeV/c2)=[3.920±0.016(stat)±0.036(syst)]×10−3. Using the Mikaelian and Smith prediction for the e+e− mass spectrum, we correct the result to the full e+e− mass range. The corrected result is B(π0→e+e−γ)/B(π0→γγ)=[1.1559±0.0047(stat)±0.0106(syst)]%. This result is consistent with previous measurements, and the uncertainty is a factor of 3 smaller than any previous measurement.