title: Helicity dependence of gammap --> Npi below 450 MeV and contribution to the Gerasimov-Drell-Hearn sum rule.
abstract: 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).
authors.affiliation: Institut für Kernphysik, Universität Mainz, D-55099 Mainz, Germany. arends@kph.uni-mainz.de
authors.forename: J
authors.initials: J
authors.lastname: Ahrens
authors.forename: S
authors.initials: S
authors.lastname: Altieri
authors.forename: J R
authors.initials: JR
authors.lastname: Annand
authors.forename: G
authors.initials: G
authors.lastname: Anton
authors.forename: H
authors.initials: H
authors.lastname: Arends
authors.forename: K
authors.initials: K
authors.lastname: Aulenbacher
authors.forename: R
authors.initials: R
authors.lastname: Beck
authors.forename: C
authors.initials: C
authors.lastname: Bradtke
authors.forename: A
authors.initials: A
authors.lastname: Braghieri
authors.forename: N
authors.initials: N
authors.lastname: Degrande
authors.forename: N
authors.initials: N
authors.lastname: d'Hose
authors.forename: H
authors.initials: H
authors.lastname: Dutz
authors.forename: S
authors.initials: S
authors.lastname: Goertz
authors.forename: P
authors.initials: P
authors.lastname: Grabmayr
authors.forename: K
authors.initials: K
authors.lastname: Hansen
authors.forename: J
authors.initials: J
authors.lastname: Harmsen
authors.forename: D
authors.initials: D
authors.lastname: von Harrach
authors.forename: S
authors.initials: S
authors.lastname: Hasegawa
authors.forename: T
authors.initials: T
authors.lastname: Hasegawa
authors.forename: E
authors.initials: E
authors.lastname: Heid
authors.forename: K
authors.initials: K
authors.lastname: Helbing
authors.forename: H
authors.initials: H
authors.lastname: Holvoet
authors.forename: L
authors.initials: L
authors.lastname: Van Hoorebeke
authors.forename: N
authors.initials: N
authors.lastname: Horikawa
authors.forename: T
authors.initials: T
authors.lastname: Iwata
authors.forename: P
authors.initials: P
authors.lastname: Jennewein
authors.forename: T
authors.initials: T
authors.lastname: Kageya
authors.forename: B
authors.initials: B
authors.lastname: Kiel
authors.forename: F
authors.initials: F
authors.lastname: Klein
authors.forename: R
authors.initials: R
authors.lastname: Kondratiev
authors.forename: K
authors.initials: K
authors.lastname: Kossert
authors.forename: J
authors.initials: J
authors.lastname: Krimmer
authors.forename: M
authors.initials: M
authors.lastname: Lang
authors.forename: B
authors.initials: B
authors.lastname: Lannoy
authors.forename: R
authors.initials: R
authors.lastname: Leukel
authors.forename: V
authors.initials: V
authors.lastname: Lisin
authors.forename: T
authors.initials: T
authors.lastname: Matsuda
authors.forename: J C
authors.initials: JC
authors.lastname: McGeorge
authors.forename: A
authors.initials: A
authors.lastname: Meier
authors.forename: D
authors.initials: D
authors.lastname: Menze
authors.forename: W
authors.initials: W
authors.lastname: Meyer
authors.forename: T
authors.initials: T
authors.lastname: Michel
authors.forename: J
authors.initials: J
authors.lastname: Naumann
authors.forename: R O
authors.initials: RO
authors.lastname: Owens
authors.forename: A
authors.initials: A
authors.lastname: Panzeri
authors.forename: P
authors.initials: P
authors.lastname: Pedroni
authors.forename: T
authors.initials: T
authors.lastname: Pinelli
authors.forename: I
authors.initials: I
authors.lastname: Preobrajenski
authors.forename: E
authors.initials: E
authors.lastname: Radtke