6533b82cfe1ef96bd128f462

RESEARCH PRODUCT

Accurate Test of Chiral Dynamics in theγ→p→π0pReaction

B. OussenaV. LisinD. P. WattsO. JahnM. DieterleS. N. PrakhovV. S. BekrenevT. RostomyanAndy ThomasR. BeckL. TiatorF. PheronD. HornidgeI. SupekP. DrexlerM. H. SikoraD. I. GlazierA. KoulbardisI. J. D. MacgregorH. BerghäuserK. LivingstonT. C. JudeJ. R. M. AnnandD. WerthmüllerM. UnverzagtA. PolonskiK W MooresMichaela ThielV. L. KashevarovD. M. ManleyM. KorolijaD. G. MiddletonH. J. ArendsB. KruscheL. V. Fil'kovI. JaegleR. KondratievM HiltP. Hall BarrientosP. Aguar BartoloméM. OstrickS. CherepnyaS. P. KruglovP. PedroniJ. RobinsonVolker MetagD. MekterovicE. HeidS. SchumannM. OberleP. B. OtteAron M. BernsteinSasa MicanovicLilian WitthauerA. BraghieriA T LaffoleyW. J. BriscoeA. N. MushkarenkovJ. MancellE. J. DownieI. KeshelashviliS SchererE. F. McnicollD. KrambrichA. StarostinCésar Fernández-ramírezB. M. K. Nefkens

subject

PhysicsPhotonChiral perturbation theory010308 nuclear & particles physicsmedia_common.quotation_subjectDetectorGeneral Physics and Astronomy01 natural sciences7. Clean energyAsymmetryNuclear physics0103 physical sciencesHermetic detectorAtomic physicsPerturbation theoryNuclear Experiment010306 general physicsMicrotronCrystal Ballmedia_common

description

A precision measurement of the differential cross sections dσ/dΩ and the linearly polarized photon asymmetry Σ≡(dσ⊥-dσ∥)/(dσ⊥+dσ∥) for the γp→π0p reaction in the near-threshold region has been performed with a tagged photon beam and almost 4π detector at the Mainz Microtron. The Glasgow-Mainz photon tagging facility along with the Crystal Ball/TAPS multiphoton detector system and a cryogenic liquid hydrogen target were used. These data allowed for a precise determination of the energy dependence of the real parts of the S- and all three P-wave amplitudes for the first time and provide the most stringent test to date of the predictions of chiral perturbation theory and its energy region of agreement with experiment.

https://doi.org/10.1103/physrevlett.111.062004