Measurement of the R_{LT} response function for π⁰ electroproduction at Q² = 0.070 (GeV/c)² in the NtoDelta transition}

N.Sparveris , R.Alarcon , D.Barkhuff , A.Bernstein , W.Bertozzi , J.Calarco , F.Casagrande , J.Chen

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J.Comfort M.Distler G.Dodson A.Dooley K.Dow M.Farkondeh S.Gilad R.Hicks M.Holtrop A.Hotta X.Jiang N.Kaloskamis A.Karabarbounis S.Kowalski C.Kunz D.Margaziotis C.Mertz R.Milner R.Miskimen I.Nakagawa C.Papanicolas M.Pavan G.Peterson A.Ramirez D.Rowntree A.Sarty J.Shaw E.Six S.Soong S.Stiliaris D.Tieger C.Tschalaer W.Turchinetz C.Vellidis G.Warren A.Young J.Zhao Z.Zhou T.Zwart (OOPS Collaboration)

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keywords amplitudessigmadeltameasurementsoopsresonantresponseresults

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Quadrupole amplitudes in the $\gamma^{*}N\to\Delta$ transition are associated with the issue of nucleon deformation. A search for these small amplitudes has been the focus of a series of measurements undertaken at Bates/MIT by the OOPS collaboration. We report on results from H$(e,e^\prime p)\pi^0$ data obtained at $Q^2= 0.070$ (GeV/c)$^2$ and invariant mass of W=1155 MeV using the out-of-plane detection technique with the OOPS spectrometers. The $\sigma_{LT}$ and $\sigma_{T}+\epsilon\cdot$ $\sigma_{L}$ response functions were isolated. These results, along with those of previous measurements at $W$=1172 MeV and $Q^2= 0.127$ (GeV/c)$^2$, aim in elucidating the interplay between resonant and non resonant amplitudes.

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Measurement of the R_{LT} response function for π⁰ electroproduction at Q² = 0.070 (GeV/c)² in the NtoDelta transition}

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