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000859247 0247_ $$2doi$$a10.1016/j.physletb.2018.10.006
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000859247 1001_ $$0P:(DE-HGF)0$$aKäser, A.$$b0
000859247 245__ $$aFirst measurement of helicity-dependent cross sections in π0η photoproduction from quasi-free nucleons
000859247 260__ $$aAmsterdam$$bNorth-Holland Publ.$$c2018
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000859247 520__ $$aThe helicity-dependent cross sections for the photoproduction of pairs have been measured for the first time. The experiment was performed at the tagged photon facility of the Mainz MAMI accelerator with the combined Crystal Ball – TAPS calorimeter. The experiment used a polarized deuterated butanol target and a circularly polarized photon beam. This arrangement allowed the (photon and target spin antiparallel) and (parallel spins) components to be measured for quasi-free production of pairs off protons and neutrons. The main finding is that the two helicity components contribute identically, within uncertainties, for both participant protons and neutrons. The absolute couplings for protons and neutrons are also identical. This means that nucleon resonances contributing to this reaction in the investigated energy range have almost equal electromagnetic helicity couplings, and . Identical couplings for protons and neutrons are typical for Δ resonances and identical and components are only possible for states, which constrains possible contributions of nucleon resonances.
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000859247 7001_ $$aDieterle, M.$$b1
000859247 7001_ $$aWitthauer, L.$$b2
000859247 7001_ $$aAbt, S.$$b3
000859247 7001_ $$aAchenbach, P.$$b4
000859247 7001_ $$aAdlarson, P.$$b5
000859247 7001_ $$aAfzal, F.$$b6
000859247 7001_ $$aAhmed, Z.$$b7
000859247 7001_ $$aAhrens, J.$$b8
000859247 7001_ $$aAnnand, J. R. M.$$b9
000859247 7001_ $$aArends, H. J.$$b10
000859247 7001_ $$aBashkanov, M.$$b11
000859247 7001_ $$aBeck, R.$$b12
000859247 7001_ $$aBiroth, M.$$b13
000859247 7001_ $$aBorisov, N. S.$$b14
000859247 7001_ $$aBraghieri, A.$$b15
000859247 7001_ $$aBriscoe, W. J.$$b16
000859247 7001_ $$aCividini, F.$$b17
000859247 7001_ $$aCollicott, C.$$b18
000859247 7001_ $$aCostanza, S.$$b19
000859247 7001_ $$aDenig, A.$$b20
000859247 7001_ $$aDownie, E. J.$$b21
000859247 7001_ $$aDrexler, P.$$b22
000859247 7001_ $$aFix, A.$$b23
000859247 7001_ $$aGarni, S.$$b24
000859247 7001_ $$aGlazier, D. I.$$b25
000859247 7001_ $$aGorodnov, I.$$b26
000859247 7001_ $$aGradl, W.$$b27
000859247 7001_ $$aGünther, M.$$b28
000859247 7001_ $$aGurevich, G. M.$$b29
000859247 7001_ $$aHeijkenskjöld, L.$$b30
000859247 7001_ $$aHornidge, D.$$b31
000859247 7001_ $$aHuber, G. M.$$b32
000859247 7001_ $$aKashevarov, V. L.$$b33
000859247 7001_ $$aKay, S.$$b34
000859247 7001_ $$0P:(DE-Juel1)164243$$aKeshelashvili, I.$$b35
000859247 7001_ $$aKondratiev, R.$$b36
000859247 7001_ $$aKorolija, M.$$b37
000859247 7001_ $$00000-0002-7845-9749$$aKrusche, B.$$b38$$eCorresponding author
000859247 7001_ $$aLazarev, A. B.$$b39
000859247 7001_ $$aLisin, V.$$b40
000859247 7001_ $$aLivingston, K.$$b41
000859247 7001_ $$aLutterer, S.$$b42
000859247 7001_ $$aMacGregor, I. J. D.$$b43
000859247 7001_ $$aManley, D. M.$$b44
000859247 7001_ $$aMartel, P. P.$$b45
000859247 7001_ $$aMetag, V.$$b46
000859247 7001_ $$aMeyer, W.$$b47
000859247 7001_ $$aMiskimen, R.$$b48
000859247 7001_ $$aMornacchi, E.$$b49
000859247 7001_ $$aMushkarenkov, A.$$b50
000859247 7001_ $$aNeganov, A. B.$$b51
000859247 7001_ $$aNeiser, A.$$b52
000859247 7001_ $$aOberle, M.$$b53
000859247 7001_ $$aOstrick, M.$$b54
000859247 7001_ $$aOtte, P. B.$$b55
000859247 7001_ $$aPaudyal, D.$$b56
000859247 7001_ $$aPedroni, P.$$b57
000859247 7001_ $$aPolonski, A.$$b58
000859247 7001_ $$aPrakhov, S. N.$$b59
000859247 7001_ $$aReicherz, G.$$b60
000859247 7001_ $$aRon, G.$$b61
000859247 7001_ $$aRostomyan, T.$$b62
000859247 7001_ $$aSarty, A.$$b63
000859247 7001_ $$aSfienti, C.$$b64
000859247 7001_ $$aSokhoyan, V.$$b65
000859247 7001_ $$aSpieker, K.$$b66
000859247 7001_ $$aSteffen, O.$$b67
000859247 7001_ $$aStrakovsky, I. I.$$b68
000859247 7001_ $$aStrub, Th.$$b69
000859247 7001_ $$aSupek, I.$$b70
000859247 7001_ $$aThiel, A.$$b71
000859247 7001_ $$0P:(DE-Juel1)133760$$aThiel, M.$$b72
000859247 7001_ $$aThomas, A.$$b73
000859247 7001_ $$aUnverzagt, M.$$b74
000859247 7001_ $$aUsov, Yu. A.$$b75
000859247 7001_ $$0P:(DE-Juel1)172693$$aWagner, S.$$b76
000859247 7001_ $$aWalford, N. K.$$b77
000859247 7001_ $$aWatts, D. P.$$b78
000859247 7001_ $$aWerthmüller, D.$$b79
000859247 7001_ $$aWettig, J.$$b80
000859247 7001_ $$aWolfes, M.$$b81
000859247 7001_ $$aZana, L.$$b82
000859247 773__ $$0PERI:(DE-600)1466612-1$$a10.1016/j.physletb.2018.10.006$$gVol. 786, p. 305 - 312$$p305 - 312$$tPhysics letters / B B$$v786$$x0370-2693$$y2018
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