Details

Autor(en) / Beteiligte

• 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, 2nd, 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

Titel

Determination of the parity of the neutral pion via its four-electron decay

Ist Teil von

• Physical review letters, 2008-05, Vol.100 (18), p.182001-182001, Article 182001

Ort / Verlag

United States

Erscheinungsjahr

2008

Quelle

American Physical Society Journals

Beschreibungen/Notizen

• We present a new determination of the parity of the neutral pion via the double Dalitz decay pi0-->e+e-e+e-. Our sample, which consists of 30,511 candidate decays, was collected from KL-->pi0pi0pi0 decays in flight at the KTeV-E799 experiment at Fermi National Accelerator Laboratory. We confirm the negative pi0 parity and place a limit on scalar contributions to the pi0-->e+e-e+e- decay amplitude of less than 3.3% assuming CPT conservation. The pi0gamma*gamma* form factor is well described by a momentum-dependent model with a slope parameter fit to the final state phase-space distribution. Additionally, we have measured the branching ratio of this mode to be B(pi0-->e+e-e+e-)=(3.26+/-0.18)x10(-5).