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arxiv: 1309.7897 · v1 · pith:MJ7QB6FLnew · submitted 2013-09-30 · ⚛️ nucl-ex

Measurement of the ¹H(vec{γ}, vec{p})π⁰ reaction using a novel nucleon spin polarimeter

D.P.Watts , D.I.Glazier , P.Aguar-Bartolom\'e , L.K.Akasoy , J.R.M.Annand , H.J.Arends , K.Bantawa , R.Beck
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V.S.Bekrenev H.Bergh\"auser A.Braghieri D.Branford W.J.Briscoe J.Brudvik S.Cherepnya R.F.B.Codling B.T.Demissie E.J.Downie P.Drexler L.V.Fil'kov B.Freehart R.Gregor D.Hamilton E.Heid D.Hornidge I.Jaegle O.Jahn T.C.Jude V.L.Kashevarov I.Keshelashvili R.Kondratiev M.Korolija M.Kotulla A.A.Koulbardis S.P.Kruglov B.Krusche V.Lisin K.Livingston I.J.D.MacGregor Y.Maghrbi D.M.Manley Z.Marinides M.Martinez J.C.McGeorge B.McKinnon E.F.McNicoll D.Mekterovic V.Metag S.Micanovic D.G.Middleton A.Mushkarenkov B.M.K.Nefkens A.Nikolaev R.Novotny M.Ostrick P.B.Otte B.Oussena P.Pedroni F.Pheron A.Polonski S.Prakhov J.Robinson G.Rosner T.Rostomyan S.Schumann D.I.Sober A.Starostin I.I.Strakovsky I.M.Suarez I.Supek M.Thiel A.Thomas M.Unverzagt D.Werthm\"uller R.L.Workman I.Zamboni F.Zehr
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keywords gammameasurementnucleonnovelpolarizationreactiontransferanalyses
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We report the first large-acceptance measurement of polarization transfer from a polarized photon beam to a recoiling nucleon, pioneering a novel polarimetry technique with wide application to future nuclear and hadronic physics experiments. The commissioning measurement of polarization transfer in the $^{1}H$($\vec{\gamma}$,$\vec{p}$)$\pi^{0}$ reaction in the range $0.4<E_{\gamma}<1.4$ GeV is highly selective regarding the basic parameterizations used in partial wave analyses to extract the nucleon excitation spectrum. The new data strongly favor the recently proposed Chew-Mandelstam formalism.

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