6533b858fe1ef96bd12b61c3

RESEARCH PRODUCT

Measurement of the π0→e+e−γ Dalitz decay at the Mainz Microtron

N. K. WalfordE. MornacchiC. CollicottK. SpiekerK. LivingstonT. C. JudeB. StrandbergS. GardnerN. S. BorisovH. J. ArendsS. CherepnyaD. P. WattsV. MetagE. J. DownieM. I. Ferretti BondyK. BantawaC. SfientiH. BerghäuserJ. RobinsonJ. WettigP. PedroniD. HornidgeP. B. OtteG. M. HuberG. RosnerR. A. MiskimenV. SokhoyanIgor StrakovskyM. UnverzagtS. GarniC. S. AkondiA. KäserS. KayJ. LinturiM. OstrickM. DieterleI. KeshelashviliYu. A. UsovP. DrexlerP. Aguar-bartoloméO. SteffenP. AdlarsonMichaela ThielV. L. KashevarovD. I. GlazierM. BirothF. CividiniA. ThielM. OberleR. KondratievG. M. GurevichGuy RonZ. AhmedV. LisinD. M. ManleyD. WerthmüllerF. AfzalE. F. McnicollS. WagnerV. V. KulikovA. B. NeganovSusanna CostanzaA. RajabiP. OttB. KruscheM. A. MartemianovC. MullenW. J. BriscoeA. N. MushkarenkovA. NikolaevJ. C. McgeorgeW. GradlP. P. MartelLilian WitthauerA. G. DenigM. KorolijaR. BeckLorenzo ZanaD. GlowaDurga PaudyalL. V. Fil'kovM. WolfesA. B. LazarevI. SupekA. BraghieriA. NeiserTh. StrubD. G. MiddletonI. J. D. MacgregorT. RostomyanJ. R. M. AnnandA. PolonskiS. N. PrakhovDavid HamiltonAndy ThomasM. H. SikoraRoderick M. Macrae

subject

Nuclear physicsPhysicsParticle physicsMeson010308 nuclear & particles physics0103 physical sciencesForm factor (quantum field theory)010306 general physics01 natural sciencesMicrotronDark photon

description

The Dalitz decay π0→e+e−γ has been measured in the γp→π0p reaction with the A2 tagged-photon facility at the Mainz Microtron, MAMI. The value obtained for the slope parameter of the π0 electromagnetic transition form factor, aπ=0.030±0.010tot, is in agreement with existing measurements of this decay and with recent theoretical calculations. The uncertainty obtained in the value of aπ is lower than in previous results based on the π0→e+e−γ decay.

https://doi.org/10.1103/physrevc.95.025202