6533b85cfe1ef96bd12bd5a3

RESEARCH PRODUCT

Helicity dependence of the γ→p→→nπ+π0 reaction in the second resonance region

T PinelliW. WeihofenN DegrandeO. JahnT MichelI. PreobrajenskiH HolvoetF. ZapadtkaM. LangR KondratievD. MenzeS HasegawaKurt HansenR. Van De VyverN. TakabayashiB SchochP. GrabmayrS AltieriJ. KrimmerJrm AnnandB LannoyF. KleinJ. NaumannA. PanzeriC BradtkeE. ReichertA BraghieriT. RostomyanA. WakaiJ. HarmsenC RovelliHj ArendsM. SauerR. LeukelH DutzA. MeierP PedroniW. MeyerG. TamasB SeitzGisela AntonN HorikawaD Von HarrachT. KageyaJ AhrensE. HeidT. SpecknerT. HasegawaR BeckF. WissmannK. KossertG RosnerJc McgeorgeS GoertzE. RadtkeD RyckboschT. MatsudaL. Van HoorebekeB KielG ReicherzG. ZeitlerP. JenneweinN. D'hoseTakahiro IwataV LisinK. HelbingA ThomasCh. RohlofK. AulenbacherM Schumacher

subject

PhysicsNuclear and High Energy PhysicsPhotonProton010308 nuclear & particles physicsNuclear TheoryResonance01 natural sciencesHelicityCross section (geometry)Nuclear physicsExcited state0103 physical sciencesPiPhysics::Accelerator PhysicsAtomic physicsNuclear Experiment010306 general physicsSpin (physics)

description

The helicity dependence of the total cross section for the (γ) over right arrow(p) over right arrownpi(+) pi(0) reaction has been measured for the first time at incident photon energies from 400 to 800 MeV The measurement was performed with the large acceptance detector DAPHNE at the tagged photon beam facility of the MAMI accelerator in Mainz. This channel is found to be excited predominantly when the photon and proton have a parallel spin orientation, due to the intermediate production of the D-13 resonance. (C) 2002 Elsevier Science B.V. All rights reserved.

https://doi.org/10.1016/s0370-2693(02)03008-3