6533b7d8fe1ef96bd1269797
RESEARCH PRODUCT
New determination of theηtransition form factor in the Dalitz decayη→e+e−γwith the Crystal Ball/TAPS detectors at the Mainz Microtron
David HamiltonM. UnverzagtC. CollicottC. CollicottA. StarostinJ. C. McgeorgeD. I. GlazierMichaela ThielV. L. KashevarovV. L. KashevarovD. HornidgeD. M. ManleyP. DrexlerM. KotullaM. KorolijaS. N. PrakhovS. CostanzaB. OussenaYasser MaghrbiAndy ThomasSteffen SchumannE. J. DownieE. J. DownieD. P. WattsLennart IsakssonI. JaegleE. F. McnicollI. I. StrakovskyI. M. SuarezR. KondratievK. BantawaB. M. K. NefkensP. OttV. LisinV. MetagV. S. BekrenevO. JahnPere MasjuanP. B. OtteA. PolonskiB. KruscheE. HeidE. HeidM. OstrickJ. R. M. AnnandA. G. DenigA. N. MushkarenkovD. I. SoberS. CherepnyaD. WerthmüllerP. Aguar-bartoloméL. V. Fil'kovI. KeshelashviliF. ZehrP. PedroniS. P. KruglovR. GregorA. NikolaevH. BerghäuserJ. RobinsonD. MekterovicC. M. TarbertK. LivingstonT. C. JudeT. RostomyanH. J. ArendsI. SupekA. FixM. H. SikoraA. KoulbardisReinhard BeckW. J. BriscoeG. RosnerF. PheronR. F. B. CodlingI. J. D. MacgregorH. OrtegaJ. BrudvikR. NovotnyA. Braghierisubject
PhysicsNuclear and High Energy PhysicsParticle physics010308 nuclear & particles physicsDetectorForm factor (quantum field theory)Gamma rayLambda01 natural sciencesNuclear physics0103 physical sciencesHigh Energy Physics::ExperimentNuclear Experiment010306 general physicsMicrotronCrystal Balldescription
The Dalitz decay eta -> e(+) e(-) gamma has been measured in the gamma p -> eta p reaction with the Crystal Ball and TAPS multiphoton spectrometers, together with the photon-tagging facility at the Mainz Microtron MAMI. The experimental statistic used in this work is one order of magnitude greater than in any previous measurement of eta -> e(+) e(-) gamma. The value obtained for the slope parameter Lambda(-2) of the eta transition form factor, Lambda(-2) = (1.95 +/- 0.15(stat) +/- 0.10(syst)) GeV-2, is in good agreement with recent measurements conducted in eta -> e(+) e(-) gamma and eta -> mu(+) mu(-) gamma decays, as well as with recent form-factor calculations. The uncertainty obtained in the value of Lambda(-2) is lower compared to results from previous measurements of the eta -> e(+) e(-) gamma decay. (Less)
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2014-04-17 | Physical Review C |