6533b824fe1ef96bd1281389

RESEARCH PRODUCT

First Measurement of the Gerasimov-Drell-Hearn Sum Rule forH1from 0.7 to 1.8 GeV at ELSA

H. HolvoetR. KondratievGisela AntonBob LannoyL. Van HoorebekeM. GodoJ. AhrensJ. NaumannA. PanzeriCh. RohlofI. PreobrajenskiT. PinelliThilo MichelT. SpecknerC BradtkeF. ZapadtkaM. LangJ. HarmsenJ. KrimmerR. Van De VyverM. SauerG. ReicherzE. HeidE. RadtkeW. V. DrachenfelsWolfgang HillertSaverio AltieriF. FrommbergerTakahiro IwataKurt HansenK. HelbingB. KielP. PedroniFrank KleinAndy ThomasG. TamasW. MeyerW. WeihofenV. LisinB. SchochR. BeckJrm AnnandA. BraghieriP. GrabmayrT. RostomyanN. HorikawaS GoertzH. DutzR. LeukelA. BockMartin SchumacherH. J. ArendsG. ZeitlerN. D'hoseP. JenneweinS. HasegawaD. Menze

subject

PhysicsParticle physicsRange (particle radiation)PhotonProton010308 nuclear & particles physicsNuclear TheoryGeneral Physics and AstronomyPhoton energy01 natural sciencesHelicityNuclear physics0103 physical sciencesHigh Energy Physics::ExperimentSum rule in quantum mechanicsNuclear Experiment010306 general physicsNucleonSpin-½

description

To verify the fundamental Gerasimov-Drell-Hearn (GDH) sum rule for the first time experimentally, we measured the helicity dependent total photoabsorption cross section with circularly polarized real photons and longitudinally polarized nucleons in the photon energy range 0.68-1.82 GeV with the tagged photon facility at ELSA. The experiment was carried out with a 4pi detection system, a circularly polarized tagged photon beam, and a frozen spin polarized proton target. The contribution to the GDH sum rule in this photon energy range is [49.9+/-2.4(stat)+/-2.2(syst)] mub.

yearjournalcountryeditionlanguage
2003-11-04Physical Review Letters
https://doi.org/10.1103/physrevlett.91.192001