Single π production off neutrons bound in deuteron with linearly polarized photons

(A2 Collaboration at MAMI)

doi:10.1140/epja/s10050-021-00521-9

Single π production off neutrons bound in deuteron with linearly polarized photons

(A2 Collaboration at MAMI)

Racah Institute of Physics

Research output: Contribution to journal › Article › peer-review

4 Scopus citations

Abstract

The quasifree →γ d → π0n(p) photon beam asymmetry, Σ, has been measured at photon energies, E_γ, from 390 to 610 MeV, corresponding to center of mass energy from 1.271 to 1.424 GeV, for the first time. The data were collected in the A2 hall of the MAMI electron beam facility with the Crystal Ball and TAPS calorimeters covering pion center-of-mass angles from 49^∘ to 148^∘. In this kinematic region, polarization observables are sensitive to contributions from the Δ(1232) and N(1440) resonances. The extracted values of Σ have been compared to predictions based on partial-wave analyses (PWAs) of the existing pion photoproduction database. Our comparison includes the SAID, MAID and Bonn–Gatchina analyses; while a revised SAID fit, including the new Σ measurements, has also been performed. In addition, isospin symmetry is examined as a way to predict πn photoproduction observables, based on fits to published data in the channels π0 p, π+n and π− p.

Original language	English
Article number	205
Journal	European Physical Journal A
Volume	57
Issue number	6
DOIs	https://doi.org/10.1140/epja/s10050-021-00521-9
State	Published - Jun 2021

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Publisher Copyright:
© 2021, The Author(s).

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10.1140/epja/s10050-021-00521-9

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@article{efe88b05095a46ccb860c7bcf1c39629,

title = "Single π production off neutrons bound in deuteron with linearly polarized photons",

abstract = "The quasifree →γ d → π0n(p) photon beam asymmetry, Σ, has been measured at photon energies, Eγ, from 390 to 610 MeV, corresponding to center of mass energy from 1.271 to 1.424 GeV, for the first time. The data were collected in the A2 hall of the MAMI electron beam facility with the Crystal Ball and TAPS calorimeters covering pion center-of-mass angles from 49∘ to 148∘. In this kinematic region, polarization observables are sensitive to contributions from the Δ(1232) and N(1440) resonances. The extracted values of Σ have been compared to predictions based on partial-wave analyses (PWAs) of the existing pion photoproduction database. Our comparison includes the SAID, MAID and Bonn–Gatchina analyses; while a revised SAID fit, including the new Σ measurements, has also been performed. In addition, isospin symmetry is examined as a way to predict πn photoproduction observables, based on fits to published data in the channels π0 p, π+n and π− p.",

author = "{(A2 Collaboration at MAMI)} and C. Mullen and S. Gardner and Glazier, {D. I.} and Kay, {S. J.D.} and K. Livingston and Strakovsky, {I. I.} and Workman, {R. L.} and S. Abt and P. Achenbach and F. Afzal and Z. Ahmed and Akondi, {C. S.} and Annand, {J. R.M.} and M. Bashkanov and R. Beck and M. Biroth and Borisov, {N. S.} and A. Braghieri and Briscoe, {W. J.} and F. Cividini and C. Collicott and S. Costanza and A. Denig and M. Dieterle and Downie, {E. J.} and P. Drexler and S. Fegan and Ferretti-Bondy, {M. I.} and D. Ghosal and I. Gorodnov and W. Gradl and M. G{\"u}nther and G. Gurevic and L. Heijkenskj{\"o}ld and D. Hornidge and Huber, {G. M.} and N. Jermann and A. Kaeser and M. Korolija and Kashevarov, {V. L.} and B. Krusche and Kulikov, {V. V.} and A. Lazarev and S. Lutterer and MacGregor, {I. J.D.} and Manley, {D. M.} and Martel, {P. P.} and Martemianov, {M. A.} and C. Meier and G. Ron",

note = "Publisher Copyright: {\textcopyright} 2021, The Author(s).",

year = "2021",

month = jun,

doi = "10.1140/epja/s10050-021-00521-9",

language = "אנגלית",

volume = "57",

journal = "European Physical Journal A",

issn = "1434-6001",

publisher = "Springer New York",

number = "6",

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TY - JOUR

T1 - Single π production off neutrons bound in deuteron with linearly polarized photons

AU - (A2 Collaboration at MAMI)

AU - Mullen, C.

AU - Gardner, S.

AU - Glazier, D. I.

AU - Kay, S. J.D.

AU - Livingston, K.

AU - Strakovsky, I. I.

AU - Workman, R. L.

AU - Abt, S.

AU - Achenbach, P.

AU - Afzal, F.

AU - Ahmed, Z.

AU - Akondi, C. S.

AU - Annand, J. R.M.

AU - Bashkanov, M.

AU - Beck, R.

AU - Biroth, M.

AU - Borisov, N. S.

AU - Braghieri, A.

AU - Briscoe, W. J.

AU - Cividini, F.

AU - Collicott, C.

AU - Costanza, S.

AU - Denig, A.

AU - Dieterle, M.

AU - Downie, E. J.

AU - Drexler, P.

AU - Fegan, S.

AU - Ferretti-Bondy, M. I.

AU - Ghosal, D.

AU - Gorodnov, I.

AU - Gradl, W.

AU - Günther, M.

AU - Gurevic, G.

AU - Heijkenskjöld, L.

AU - Hornidge, D.

AU - Huber, G. M.

AU - Jermann, N.

AU - Kaeser, A.

AU - Korolija, M.

AU - Kashevarov, V. L.

AU - Krusche, B.

AU - Kulikov, V. V.

AU - Lazarev, A.

AU - Lutterer, S.

AU - MacGregor, I. J.D.

AU - Manley, D. M.

AU - Martel, P. P.

AU - Martemianov, M. A.

AU - Meier, C.

AU - Ron, G.

PY - 2021/6

Y1 - 2021/6

N2 - The quasifree →γ d → π0n(p) photon beam asymmetry, Σ, has been measured at photon energies, Eγ, from 390 to 610 MeV, corresponding to center of mass energy from 1.271 to 1.424 GeV, for the first time. The data were collected in the A2 hall of the MAMI electron beam facility with the Crystal Ball and TAPS calorimeters covering pion center-of-mass angles from 49∘ to 148∘. In this kinematic region, polarization observables are sensitive to contributions from the Δ(1232) and N(1440) resonances. The extracted values of Σ have been compared to predictions based on partial-wave analyses (PWAs) of the existing pion photoproduction database. Our comparison includes the SAID, MAID and Bonn–Gatchina analyses; while a revised SAID fit, including the new Σ measurements, has also been performed. In addition, isospin symmetry is examined as a way to predict πn photoproduction observables, based on fits to published data in the channels π0 p, π+n and π− p.

AB - The quasifree →γ d → π0n(p) photon beam asymmetry, Σ, has been measured at photon energies, Eγ, from 390 to 610 MeV, corresponding to center of mass energy from 1.271 to 1.424 GeV, for the first time. The data were collected in the A2 hall of the MAMI electron beam facility with the Crystal Ball and TAPS calorimeters covering pion center-of-mass angles from 49∘ to 148∘. In this kinematic region, polarization observables are sensitive to contributions from the Δ(1232) and N(1440) resonances. The extracted values of Σ have been compared to predictions based on partial-wave analyses (PWAs) of the existing pion photoproduction database. Our comparison includes the SAID, MAID and Bonn–Gatchina analyses; while a revised SAID fit, including the new Σ measurements, has also been performed. In addition, isospin symmetry is examined as a way to predict πn photoproduction observables, based on fits to published data in the channels π0 p, π+n and π− p.

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DO - 10.1140/epja/s10050-021-00521-9

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AN - SCOPUS:85109110965

SN - 1434-6001

VL - 57

JO - European Physical Journal A

JF - European Physical Journal A

IS - 6

M1 - 205

ER -

Single π production off neutrons bound in deuteron with linearly polarized photons

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