Insight into the Narrow Structure in eta Photoproduction on the Neutron from Helicity-Dependent Cross Sections

L. Witthauer; M. Dieterle; S. Abt P. Achenbach; F. Afzal; Z. Ahmed; J. R. M. Annand; H. J. Arends; M. Bashkanov; R. Beck; M. Biroth; N. S. Borisov; A. Braghieri; W. J. Briscoe; F. Cividini; S. Costanza; C. Collicott; A. Denig; E. J. Downie; P. Drexler; M. I. Ferretti-Bondy; S. Gardner; S. Garni; D. I. Glazier; D. Glowa; W. Gradl; M. Gunther; G. M. Gurevich; D. Hamilton; D. Hornidge; G. M. Huber; A. Kaser; V. L. Kashevarov; I. Keshelashvili; R. Kondratiev; M. Korolija; B. Krusche; A. B. Lazarev; J. M. Linturi; V. Lisin; S. Lutterer; I. J. D. MacGregor; J. Mancell; D. M. Manley; P. P. Martel; V. Metag; W. Meyer; R. Miskimen; E. Mornacchi; A. Mushkarenkov; A. B. Neganov; A. Neiser; M. Oberle; M. Ostrick; P. B. Otte; D. Paudyal; P. Pedroni; A. Polonski; S. N. Prakhov; A. Rajabi; G. Reicherz; G. Ron; T. Rostomyan; A. Sarty; C. Sfienti; M. H. Sikora; V. Sokhoyan; K. Spieker; O. Steffen; I. I. Strakovski; Th. Strub; I. Supek; A. Thiel; M. Thiel; M. Unverzagt; Yu. A. Usov; S. Wagner; N. K. Walford; D. P. Watts; D. Werthmuller; J. Wettig; M. Wolfes; L. Zana

doi:10.1103/PhysRevLett.117.132502

Insight into the Narrow Structure in eta Photoproduction on the Neutron from Helicity-Dependent Cross Sections

L. Witthauer, M. Dieterle, S. Abt P. Achenbach, F. Afzal, Z. Ahmed, J. R. M. Annand, H. J. Arends, M. Bashkanov, R. Beck, M. Biroth, N. S. Borisov, A. Braghieri, W. J. Briscoe, F. Cividini, S. Costanza, C. Collicott, A. Denig, E. J. Downie, P. Drexler, M. I. Ferretti-BondyS. Gardner, S. Garni, D. I. Glazier, D. Glowa, W. Gradl, M. Gunther, G. M. Gurevich, D. Hamilton, D. Hornidge, G. M. Huber, A. Kaser, V. L. Kashevarov, I. Keshelashvili^*, R. Kondratiev, M. Korolija, B. Krusche, A. B. Lazarev, J. M. Linturi, V. Lisin, S. Lutterer, I. J. D. MacGregor, J. Mancell, D. M. Manley, P. P. Martel, V. Metag, W. Meyer, R. Miskimen, E. Mornacchi, A. Mushkarenkov, A. B. Neganov, A. Neiser, M. Oberle, M. Ostrick, P. B. Otte, D. Paudyal, P. Pedroni, A. Polonski, S. N. Prakhov, A. Rajabi, G. Reicherz, G. Ron, T. Rostomyan, A. Sarty, C. Sfienti, M. H. Sikora, V. Sokhoyan, K. Spieker, O. Steffen, I. I. Strakovski, Th. Strub, I. Supek, A. Thiel, M. Thiel, M. Unverzagt, Yu. A. Usov, S. Wagner, N. K. Walford, D. P. Watts, D. Werthmuller, J. Wettig, M. Wolfes, L. Zana

^*Corresponding author for this work

School of Physics and Astronomy

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

Abstract

The double polarization observable E and the helicity dependent cross sections sigma(1/2) and sigma(3/2) were measured for eta photoproduction from quasifree protons and neutrons. The circularly polarized tagged photon beam of the A2 experiment at the Mainz MAMI accelerator was used in combination with a longitudinally polarized deuterated butanol target. The almost 4 pi detector setup of the Crystal Ball and TAPS is ideally suited to detect the recoil nucleons and the decay photons from eta -> 2 gamma and eta -> 3 pi(0). The results show that the narrow structure previously observed in eta photoproduction from the neutron is only apparent in sigma(1/2) and hence, most likely related to a spin-1/2 amplitude. Nucleon resonances that contribute to this partial wave in eta production are only N1/2(-) (S-11) and N1/2(+) (P-11). Furthermore, the extracted Legendre coefficients of the angular distributions for sigma(1/2) are in good agreement with recent reaction model predictions assuming a narrow resonance in the P-11 wave as the origin of this structure.

Original language	English
Article number	132502
Number of pages	5
Journal	Physical Review Letters
Volume	117
Issue number	13
DOIs	https://doi.org/10.1103/PhysRevLett.117.132502
Publication status	Published - 22 Sept 2016

Keywords / Materials (for Non-textual outputs)

RESONANCE
MESONS
PHOTON

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PhysRevLett.117.132502Final published version, 347 KB

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Witthauer, L., Dieterle, M., Achenbach, S. A. P., Afzal, F., Ahmed, Z., Annand, J. R. M., Arends, H. J., Bashkanov, M., Beck, R., Biroth, M., Borisov, N. S., Braghieri, A., Briscoe, W. J., Cividini, F., Costanza, S., Collicott, C., Denig, A., Downie, E. J., Drexler, P., ... Zana, L. (2016). Insight into the Narrow Structure in eta Photoproduction on the Neutron from Helicity-Dependent Cross Sections. Physical Review Letters, 117(13), Article 132502. https://doi.org/10.1103/PhysRevLett.117.132502

@article{7c3b1ecdcf9c4e64899fa8ba41d43781,

title = "Insight into the Narrow Structure in eta Photoproduction on the Neutron from Helicity-Dependent Cross Sections",

abstract = "The double polarization observable E and the helicity dependent cross sections sigma(1/2) and sigma(3/2) were measured for eta photoproduction from quasifree protons and neutrons. The circularly polarized tagged photon beam of the A2 experiment at the Mainz MAMI accelerator was used in combination with a longitudinally polarized deuterated butanol target. The almost 4 pi detector setup of the Crystal Ball and TAPS is ideally suited to detect the recoil nucleons and the decay photons from eta -> 2 gamma and eta -> 3 pi(0). The results show that the narrow structure previously observed in eta photoproduction from the neutron is only apparent in sigma(1/2) and hence, most likely related to a spin-1/2 amplitude. Nucleon resonances that contribute to this partial wave in eta production are only N1/2(-) (S-11) and N1/2(+) (P-11). Furthermore, the extracted Legendre coefficients of the angular distributions for sigma(1/2) are in good agreement with recent reaction model predictions assuming a narrow resonance in the P-11 wave as the origin of this structure.",

keywords = "RESONANCE, MESONS, PHOTON",

author = "L. Witthauer and M. Dieterle and Achenbach, {S. Abt P.} and F. Afzal and Z. Ahmed and Annand, {J. R. M.} and Arends, {H. J.} and M. Bashkanov and R. Beck and M. Biroth and Borisov, {N. S.} and A. Braghieri and Briscoe, {W. J.} and F. Cividini and S. Costanza and C. Collicott and A. Denig and Downie, {E. J.} and P. Drexler and Ferretti-Bondy, {M. I.} and S. Gardner and S. Garni and Glazier, {D. I.} and D. Glowa and W. Gradl and M. Gunther and Gurevich, {G. M.} and D. Hamilton and D. Hornidge and Huber, {G. M.} and A. Kaser and Kashevarov, {V. L.} and I. Keshelashvili and R. Kondratiev and M. Korolija and B. Krusche and Lazarev, {A. B.} and Linturi, {J. M.} and V. Lisin and S. Lutterer and MacGregor, {I. J. D.} and J. Mancell and Manley, {D. M.} and Martel, {P. P.} and V. Metag and W. Meyer and R. Miskimen and E. Mornacchi and A. Mushkarenkov and Neganov, {A. B.} and A. Neiser and M. Oberle and M. Ostrick and Otte, {P. B.} and D. Paudyal and P. Pedroni and A. Polonski and Prakhov, {S. N.} and A. Rajabi and G. Reicherz and G. Ron and T. Rostomyan and A. Sarty and C. Sfienti and Sikora, {M. H.} and V. Sokhoyan and K. Spieker and O. Steffen and Strakovski, {I. I.} and Th. Strub and I. Supek and A. Thiel and M. Thiel and M. Unverzagt and Usov, {Yu. A.} and S. Wagner and Walford, {N. K.} and Watts, {D. P.} and D. Werthmuller and J. Wettig and M. Wolfes and L. Zana",

year = "2016",

month = sep,

day = "22",

doi = "10.1103/PhysRevLett.117.132502",

language = "English",

volume = "117",

journal = "Physical Review Letters",

issn = "0031-9007",

publisher = "American Physical Society",

number = "13",

}

Witthauer, L, Dieterle, M, Achenbach, SAP, Afzal, F, Ahmed, Z, Annand, JRM, Arends, HJ, Bashkanov, M, Beck, R, Biroth, M, Borisov, NS, Braghieri, A, Briscoe, WJ, Cividini, F, Costanza, S, Collicott, C, Denig, A, Downie, EJ, Drexler, P, Ferretti-Bondy, MI, Gardner, S, Garni, S, Glazier, DI, Glowa, D, Gradl, W, Gunther, M, Gurevich, GM, Hamilton, D, Hornidge, D, Huber, GM, Kaser, A, Kashevarov, VL, Keshelashvili, I, Kondratiev, R, Korolija, M, Krusche, B, Lazarev, AB, Linturi, JM, Lisin, V, Lutterer, S, MacGregor, IJD, Mancell, J, Manley, DM, Martel, PP, Metag, V, Meyer, W, Miskimen, R, Mornacchi, E, Mushkarenkov, A, Neganov, AB, Neiser, A, Oberle, M, Ostrick, M, Otte, PB, Paudyal, D, Pedroni, P, Polonski, A, Prakhov, SN, Rajabi, A, Reicherz, G, Ron, G, Rostomyan, T, Sarty, A, Sfienti, C, Sikora, MH, Sokhoyan, V, Spieker, K, Steffen, O, Strakovski, II, Strub, T, Supek, I, Thiel, A, Thiel, M, Unverzagt, M, Usov, YA, Wagner, S, Walford, NK, Watts, DP, Werthmuller, D, Wettig, J, Wolfes, M & Zana, L 2016, 'Insight into the Narrow Structure in eta Photoproduction on the Neutron from Helicity-Dependent Cross Sections', Physical Review Letters, vol. 117, no. 13, 132502. https://doi.org/10.1103/PhysRevLett.117.132502

TY - JOUR

T1 - Insight into the Narrow Structure in eta Photoproduction on the Neutron from Helicity-Dependent Cross Sections

AU - Witthauer, L.

AU - Dieterle, M.

AU - Achenbach, S. Abt P.

AU - Afzal, F.

AU - Ahmed, Z.

AU - Annand, J. R. M.

AU - Arends, H. J.

AU - Bashkanov, M.

AU - Beck, R.

AU - Biroth, M.

AU - Borisov, N. S.

AU - Braghieri, A.

AU - Briscoe, W. J.

AU - Cividini, F.

AU - Costanza, S.

AU - Collicott, C.

AU - Denig, A.

AU - Downie, E. J.

AU - Drexler, P.

AU - Ferretti-Bondy, M. I.

AU - Gardner, S.

AU - Garni, S.

AU - Glazier, D. I.

AU - Glowa, D.

AU - Gradl, W.

AU - Gunther, M.

AU - Gurevich, G. M.

AU - Hamilton, D.

AU - Hornidge, D.

AU - Huber, G. M.

AU - Kaser, A.

AU - Kashevarov, V. L.

AU - Keshelashvili, I.

AU - Kondratiev, R.

AU - Korolija, M.

AU - Krusche, B.

AU - Lazarev, A. B.

AU - Linturi, J. M.

AU - Lisin, V.

AU - Lutterer, S.

AU - MacGregor, I. J. D.

AU - Mancell, J.

AU - Manley, D. M.

AU - Martel, P. P.

AU - Metag, V.

AU - Meyer, W.

AU - Miskimen, R.

AU - Mornacchi, E.

AU - Mushkarenkov, A.

AU - Neganov, A. B.

AU - Neiser, A.

AU - Oberle, M.

AU - Ostrick, M.

AU - Otte, P. B.

AU - Paudyal, D.

AU - Pedroni, P.

AU - Polonski, A.

AU - Prakhov, S. N.

AU - Rajabi, A.

AU - Reicherz, G.

AU - Ron, G.

AU - Rostomyan, T.

AU - Sarty, A.

AU - Sfienti, C.

AU - Sikora, M. H.

AU - Sokhoyan, V.

AU - Spieker, K.

AU - Steffen, O.

AU - Strakovski, I. I.

AU - Strub, Th.

AU - Supek, I.

AU - Thiel, A.

AU - Thiel, M.

AU - Unverzagt, M.

AU - Usov, Yu. A.

AU - Wagner, S.

AU - Walford, N. K.

AU - Watts, D. P.

AU - Werthmuller, D.

AU - Wettig, J.

AU - Wolfes, M.

AU - Zana, L.

PY - 2016/9/22

Y1 - 2016/9/22

N2 - The double polarization observable E and the helicity dependent cross sections sigma(1/2) and sigma(3/2) were measured for eta photoproduction from quasifree protons and neutrons. The circularly polarized tagged photon beam of the A2 experiment at the Mainz MAMI accelerator was used in combination with a longitudinally polarized deuterated butanol target. The almost 4 pi detector setup of the Crystal Ball and TAPS is ideally suited to detect the recoil nucleons and the decay photons from eta -> 2 gamma and eta -> 3 pi(0). The results show that the narrow structure previously observed in eta photoproduction from the neutron is only apparent in sigma(1/2) and hence, most likely related to a spin-1/2 amplitude. Nucleon resonances that contribute to this partial wave in eta production are only N1/2(-) (S-11) and N1/2(+) (P-11). Furthermore, the extracted Legendre coefficients of the angular distributions for sigma(1/2) are in good agreement with recent reaction model predictions assuming a narrow resonance in the P-11 wave as the origin of this structure.

AB - The double polarization observable E and the helicity dependent cross sections sigma(1/2) and sigma(3/2) were measured for eta photoproduction from quasifree protons and neutrons. The circularly polarized tagged photon beam of the A2 experiment at the Mainz MAMI accelerator was used in combination with a longitudinally polarized deuterated butanol target. The almost 4 pi detector setup of the Crystal Ball and TAPS is ideally suited to detect the recoil nucleons and the decay photons from eta -> 2 gamma and eta -> 3 pi(0). The results show that the narrow structure previously observed in eta photoproduction from the neutron is only apparent in sigma(1/2) and hence, most likely related to a spin-1/2 amplitude. Nucleon resonances that contribute to this partial wave in eta production are only N1/2(-) (S-11) and N1/2(+) (P-11). Furthermore, the extracted Legendre coefficients of the angular distributions for sigma(1/2) are in good agreement with recent reaction model predictions assuming a narrow resonance in the P-11 wave as the origin of this structure.

KW - RESONANCE

KW - MESONS

KW - PHOTON

U2 - 10.1103/PhysRevLett.117.132502

DO - 10.1103/PhysRevLett.117.132502

M3 - Article

SN - 0031-9007

VL - 117

JO - Physical Review Letters

JF - Physical Review Letters

IS - 13

M1 - 132502

ER -

Insight into the Narrow Structure in eta Photoproduction on the Neutron from Helicity-Dependent Cross Sections

Abstract

Keywords / Materials (for Non-textual outputs)

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