6533b7d0fe1ef96bd125ab5c
RESEARCH PRODUCT
Measurement of the decay η′→π0π0η at MAMI
P. AdlarsonF. AfzalZ. AhmedC.s. AkondiJ.r.m. AnnandH.j. ArendsR. BeckN. BorisovA. BraghieriW.j. BriscoeF. CividiniC. CollicottS. CostanzaA. DenigE.j. DownieM. DieterleM.i. Ferretti BondyS. GardnerS. GarniD.i. GlazierD. GlowaW. GradlG. GurevichD.j. HamiltonD. HornidgeG.m. HuberA. KäserV.l. KashevarovS. KayI. KeshelashviliR. KondratievM. KorolijaB. KruscheA. LazarevJ. LinturiK. LivingstonI.j.d. MacgregorD.m. ManleyP.p. MartelJ.c. McgeorgeD.g. MiddletonR. MiskimenA. MushkarenkovA. NeganovA. NeiserM. OberleM. OstrickP. OttP.b. OtteB. OussenaD. PaudyalP. PedroniA. PolonskiS. PrakhovA. RajabiG. RonT. RostomyanA. SartyC. SfientiV. SokhoyanK. SpiekerO. SteffenI.i. StrakovskyT. StrubI. SupekA. ThielM. ThielL. TiatorA. ThomasM. UnverzagtY.a. UsovS. WagnerD.p. WattsD. WerthmuellerJ. WettigL. WitthauerM. WolfesR.l. WorkmanL.a. Zanasubject
PhysicsHigh Energy Physics::ExperimentNuclear Experimentmatrix-element ; mass ; microtron ; 3-Pi(0) ; cusps ; ratiodescription
An experimental study of the eta' -> pi(0)pi(0)eta -> 6 gamma decay has been conducted with the best up-to-date statistical accuracy, by measuring. 0 mesons produced in the gamma p -> eta'p reaction with the A2 tagged-photon facility at the Mainz Microtron, MAMI. The results obtained for the standard parametrization of the eta' -> pi(0)pi(0)eta matrix element are consistent with the most recent results for eta' -> pi pi eta decays, but have smaller uncertainties. The available statistics and experimental resolution allowed, for the first time, an observation of a structure below the pi(+)pi(-) thorn p-mass threshold, the magnitude and sign of which, checked within the framework of the nonrelativistic effective-field theory, demonstrated good agreement with the cusp that was predicted based on the pi pi scattering length combination, a(0)-a(2), extracted from K -> 3 pi decays.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2018-07-03 |