6533b862fe1ef96bd12c6b92

RESEARCH PRODUCT

Helicity Dependence ofγp→Nπbelow 450 MeV and Contribution to the Gerasimov-Drell-Hearn Sum Rule

R. KondratievA BraghieriW. MeyerA. PanzeriR. Van De VyverB. SchochT. KageyaJ. HarmsenE. RadtkeSaverio AltieriK. HelbingR.o. OwensF. WissmannP. GrabmayrW. WeihofenH. HolvoetB. LannoyD. Von HarrachM. SauerE. ReichertR. BeckJ. NaumannMartin SchumacherJ. R. M. AnnandH. DutzM. SteigerwaldT. HasegawaR. LeukelI. PreobrajenskiH. J. ArendsF. ZapadtkaM. LangA. WakaiGisela AntonF. SadiqB. KielV. LisinJ. AhrensN. D'hoseCh. RohlofP. JenneweinN. TakabayashiP PedroniB SeitzK. AulenbacherG. ReicherzS. HasegawaJ. C. McgeorgeD. MenzeL. Van HoorebekeJ. KrimmerKurt HansenT. SpecknerAndy ThomasN. HorikawaDirk RyckboschG. ZeitlerN. DegrandeC. BradtkeTakahiro IwataT. MatsudaK. KossertFrank KleinT. PinelliThilo MichelS. GoertzE. HeidA. MeierG. Tamas

subject

PhysicsParticle physicsProtonNuclear TheoryGeneral Physics and AstronomyHelicityNuclear physicsPionPolarizabilityPhysics::Accelerator PhysicsHigh Energy Physics::ExperimentSum rule in quantum mechanicsNuclear ExperimentMultipole expansionMicrotronSpin-½

description

The helicity dependence of the single pion photoproduction on the proton has been measured in the energy range from 200 to 450 MeV for the first time. The experiment, performed at the Mainz microtron MAMI, used a 4pi-detector system, a circularly polarized, tagged photon beam, and a frozen-spin target. The data obtained provide new information for multipole analyses of pion photoproduction and determine the main contributions to the Gerasimov-Drell-Hearn sum rule and the forward spin polarizability gamma(0).

https://doi.org/10.1103/physrevlett.84.5950