Threshold π0 photoproduction on transverse polarised protons at MAMI

S. Schumanna; P. B. Otte; C. S. Akondi; J. R.M. Annand; H. J. Arends; R. Beck; A. M. Bernstein; N. Borisov; A. Braghieri; W. J. Briscoe; S. Cherepnya; C. Collicott; S. Costanza; E. J. Downiea; M. Dieterle; C. Fernández-Ramírez; A. Fixn; L. V. Fil'kov; S. Garni; D. I. Glaziero; W. Gradl; G. Gurevich; P. Hall-Barrientos; D. Hamilton; D. Hornidge; D. Howdle; G. M. Huber; V. L. Kashevarov; I. Keshelashvili; R. Kondratiev; M. Korolija; B. Krusche; A. Lazarev; V. Lisin; K. Livingston; I. J.D. MacGregor; J. Mancel; D. M. Manley; P. P. Martel; E. F. McNicoll; W. Meyer; D. Middleton; R. Miskimen; A. Mushkarenkov; B. M.K. Nefkens; A. Neganov; A. Nikolaev; M. Oberle; M. Ostrick; H. Ortega; P. Ott; B. Oussena; D. Paudyal; P. Pedroni; A. Polonski; V. V. Polyanski; S. Prakhov; G. Reicherz; T. Rostomyan; A. Sarty; M. H. Sikora; V. Sokhoyan; O. Steffen; I. I. Strakovsky; Th Strub; I. Supek; L. Tiator; M. Unverzagt; Yu A. Usov; D. P. Watts; D. Werthmüller; L. Witthauer; M. Wolfesa

doi:10.1016/j.physletb.2015.09.015

Threshold π⁰ photoproduction on transverse polarised protons at MAMI

S. Schumanna, P. B. Otte, C. S. Akondi, J. R.M. Annand, H. J. Arends, R. Beck, A. M. Bernstein, N. Borisov, A. Braghieri, W. J. Briscoe, S. Cherepnya, C. Collicott, S. Costanza, E. J. Downiea, M. Dieterle, C. Fernández-Ramírez, A. Fixn, L. V. Fil'kov, S. Garni, D. I. GlazieroW. Gradl, G. Gurevich, P. Hall-Barrientos, D. Hamilton, D. Hornidge, D. Howdle, G. M. Huber, V. L. Kashevarov, I. Keshelashvili, R. Kondratiev, M. Korolija, B. Krusche, A. Lazarev, V. Lisin, K. Livingston, I. J.D. MacGregor, J. Mancel, D. M. Manley, P. P. Martel, E. F. McNicoll, W. Meyer, D. Middleton, R. Miskimen, A. Mushkarenkov, B. M.K. Nefkens, A. Neganov, A. Nikolaev, M. Oberle, M. Ostrick^*, H. Ortega, P. Ott, B. Oussena, D. Paudyal, P. Pedroni, A. Polonski, V. V. Polyanski, S. Prakhov, G. Reicherz, T. Rostomyan, A. Sarty, M. H. Sikora, V. Sokhoyan, O. Steffen, I. I. Strakovsky, Th Strub, I. Supek, L. Tiator, M. Unverzagt, Yu A. Usov, D. P. Watts, D. Werthmüller, L. Witthauer, M. Wolfesa

^*Corresponding author for this work

Physics

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

Abstract

Polarisation-dependent differential cross sections σ_T associated with the target asymmetry T have been measured for the reaction γp→→pπ0 with transverse target polarisation from π⁰ threshold to photon energies of 190 MeV. The data were obtained using a frozen-spin butanol target with the Crystal Ball / TAPS detector set-up and the Glasgow photon tagging system at the Mainz Microtron MAMI. Results for σ_T have been used in combination with our previous measurements of the unpolarised cross section σ₀ and the beam asymmetry σ for a model-independent determination of S- and P-wave multipoles in the π⁰ threshold region, which includes for the first time a direct determination of the imaginary part of the E₀₊ multipole.

Original language	English
Pages (from-to)	252-258
Number of pages	7
Journal	Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
Volume	750
DOIs	https://doi.org/10.1016/j.physletb.2015.09.015
Publication status	Published - 12 Nov 2015

Keywords

Electromagnetic multipoles
Target asymmetry
Threshold π photoproduction

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10.1016/j.physletb.2015.09.015

Cite this

Schumanna, S., Otte, P. B., Akondi, C. S., Annand, J. R. M., Arends, H. J., Beck, R., Bernstein, A. M., Borisov, N., Braghieri, A., Briscoe, W. J., Cherepnya, S., Collicott, C., Costanza, S., Downiea, E. J., Dieterle, M., Fernández-Ramírez, C., Fixn, A., Fil'kov, L. V., Garni, S., ... Wolfesa, M. (2015). Threshold π⁰ photoproduction on transverse polarised protons at MAMI. Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics, 750, 252-258. https://doi.org/10.1016/j.physletb.2015.09.015

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title = "Threshold π0 photoproduction on transverse polarised protons at MAMI",

abstract = "Polarisation-dependent differential cross sections σT associated with the target asymmetry T have been measured for the reaction γp→→pπ0 with transverse target polarisation from π0 threshold to photon energies of 190 MeV. The data were obtained using a frozen-spin butanol target with the Crystal Ball / TAPS detector set-up and the Glasgow photon tagging system at the Mainz Microtron MAMI. Results for σT have been used in combination with our previous measurements of the unpolarised cross section σ0 and the beam asymmetry σ for a model-independent determination of S- and P-wave multipoles in the π0 threshold region, which includes for the first time a direct determination of the imaginary part of the E0+ multipole.",

keywords = "Electromagnetic multipoles, Target asymmetry, Threshold π photoproduction",

author = "S. Schumanna and Otte, {P. B.} and Akondi, {C. S.} and Annand, {J. R.M.} and Arends, {H. J.} and R. Beck and Bernstein, {A. M.} and N. Borisov and A. Braghieri and Briscoe, {W. J.} and S. Cherepnya and C. Collicott and S. Costanza and Downiea, {E. J.} and M. Dieterle and C. Fern{\'a}ndez-Ram{\'i}rez and A. Fixn and Fil'kov, {L. V.} and S. Garni and Glaziero, {D. I.} and W. Gradl and G. Gurevich and P. Hall-Barrientos and D. Hamilton and D. Hornidge and D. Howdle and Huber, {G. M.} and Kashevarov, {V. L.} and I. Keshelashvili and R. Kondratiev and M. Korolija and B. Krusche and A. Lazarev and V. Lisin and K. Livingston and MacGregor, {I. J.D.} and J. Mancel and Manley, {D. M.} and Martel, {P. P.} and McNicoll, {E. F.} and W. Meyer and D. Middleton and R. Miskimen and A. Mushkarenkov and Nefkens, {B. M.K.} and A. Neganov and A. Nikolaev and M. Oberle and M. Ostrick and H. Ortega and P. Ott and B. Oussena and D. Paudyal and P. Pedroni and A. Polonski and Polyanski, {V. V.} and S. Prakhov and G. Reicherz and T. Rostomyan and A. Sarty and Sikora, {M. H.} and V. Sokhoyan and O. Steffen and Strakovsky, {I. I.} and Th Strub and I. Supek and L. Tiator and M. Unverzagt and Usov, {Yu A.} and Watts, {D. P.} and D. Werthm{\"u}ller and L. Witthauer and M. Wolfesa",

year = "2015",

month = nov,

day = "12",

doi = "10.1016/j.physletb.2015.09.015",

language = "English",

volume = "750",

pages = "252--258",

journal = "Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics",

issn = "0370-2693",

publisher = "Elsevier",

}

Schumanna, S, Otte, PB, Akondi, CS, Annand, JRM, Arends, HJ, Beck, R, Bernstein, AM, Borisov, N, Braghieri, A, Briscoe, WJ, Cherepnya, S, Collicott, C, Costanza, S, Downiea, EJ, Dieterle, M, Fernández-Ramírez, C, Fixn, A, Fil'kov, LV, Garni, S, Glaziero, DI, Gradl, W, Gurevich, G, Hall-Barrientos, P, Hamilton, D, Hornidge, D, Howdle, D, Huber, GM, Kashevarov, VL, Keshelashvili, I, Kondratiev, R, Korolija, M, Krusche, B, Lazarev, A, Lisin, V, Livingston, K, MacGregor, IJD, Mancel, J, Manley, DM, Martel, PP, McNicoll, EF, Meyer, W, Middleton, D, Miskimen, R, Mushkarenkov, A, Nefkens, BMK, Neganov, A, Nikolaev, A, Oberle, M, Ostrick, M, Ortega, H, Ott, P, Oussena, B, Paudyal, D, Pedroni, P, Polonski, A, Polyanski, VV, Prakhov, S, Reicherz, G, Rostomyan, T, Sarty, A, Sikora, MH, Sokhoyan, V, Steffen, O, Strakovsky, II, Strub, T, Supek, I, Tiator, L, Unverzagt, M, Usov, YA, Watts, DP , Werthmüller, D, Witthauer, L & Wolfesa, M 2015, 'Threshold π⁰ photoproduction on transverse polarised protons at MAMI', Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics, vol. 750, pp. 252-258. https://doi.org/10.1016/j.physletb.2015.09.015

TY - JOUR

T1 - Threshold π0 photoproduction on transverse polarised protons at MAMI

AU - Schumanna, S.

AU - Otte, P. B.

AU - Akondi, C. S.

AU - Annand, J. R.M.

AU - Arends, H. J.

AU - Beck, R.

AU - Bernstein, A. M.

AU - Borisov, N.

AU - Braghieri, A.

AU - Briscoe, W. J.

AU - Cherepnya, S.

AU - Collicott, C.

AU - Costanza, S.

AU - Downiea, E. J.

AU - Dieterle, M.

AU - Fernández-Ramírez, C.

AU - Fixn, A.

AU - Fil'kov, L. V.

AU - Garni, S.

AU - Glaziero, D. I.

AU - Gradl, W.

AU - Gurevich, G.

AU - Hall-Barrientos, P.

AU - Hamilton, D.

AU - Hornidge, D.

AU - Howdle, D.

AU - Huber, G. M.

AU - Kashevarov, V. L.

AU - Keshelashvili, I.

AU - Kondratiev, R.

AU - Korolija, M.

AU - Krusche, B.

AU - Lazarev, A.

AU - Lisin, V.

AU - Livingston, K.

AU - MacGregor, I. J.D.

AU - Mancel, J.

AU - Manley, D. M.

AU - Martel, P. P.

AU - McNicoll, E. F.

AU - Meyer, W.

AU - Middleton, D.

AU - Miskimen, R.

AU - Mushkarenkov, A.

AU - Nefkens, B. M.K.

AU - Neganov, A.

AU - Nikolaev, A.

AU - Oberle, M.

AU - Ostrick, M.

AU - Ortega, H.

AU - Ott, P.

AU - Oussena, B.

AU - Paudyal, D.

AU - Pedroni, P.

AU - Polonski, A.

AU - Polyanski, V. V.

AU - Prakhov, S.

AU - Reicherz, G.

AU - Rostomyan, T.

AU - Sarty, A.

AU - Sikora, M. H.

AU - Sokhoyan, V.

AU - Steffen, O.

AU - Strakovsky, I. I.

AU - Strub, Th

AU - Supek, I.

AU - Tiator, L.

AU - Unverzagt, M.

AU - Usov, Yu A.

AU - Watts, D. P.

AU - Werthmüller, D.

AU - Witthauer, L.

AU - Wolfesa, M.

PY - 2015/11/12

Y1 - 2015/11/12

N2 - Polarisation-dependent differential cross sections σT associated with the target asymmetry T have been measured for the reaction γp→→pπ0 with transverse target polarisation from π0 threshold to photon energies of 190 MeV. The data were obtained using a frozen-spin butanol target with the Crystal Ball / TAPS detector set-up and the Glasgow photon tagging system at the Mainz Microtron MAMI. Results for σT have been used in combination with our previous measurements of the unpolarised cross section σ0 and the beam asymmetry σ for a model-independent determination of S- and P-wave multipoles in the π0 threshold region, which includes for the first time a direct determination of the imaginary part of the E0+ multipole.

AB - Polarisation-dependent differential cross sections σT associated with the target asymmetry T have been measured for the reaction γp→→pπ0 with transverse target polarisation from π0 threshold to photon energies of 190 MeV. The data were obtained using a frozen-spin butanol target with the Crystal Ball / TAPS detector set-up and the Glasgow photon tagging system at the Mainz Microtron MAMI. Results for σT have been used in combination with our previous measurements of the unpolarised cross section σ0 and the beam asymmetry σ for a model-independent determination of S- and P-wave multipoles in the π0 threshold region, which includes for the first time a direct determination of the imaginary part of the E0+ multipole.

KW - Electromagnetic multipoles

KW - Target asymmetry

KW - Threshold π photoproduction

UR - http://www.scopus.com/inward/record.url?scp=84941961533&partnerID=8YFLogxK

U2 - 10.1016/j.physletb.2015.09.015

DO - 10.1016/j.physletb.2015.09.015

M3 - Article

SN - 0370-2693

VL - 750

SP - 252

EP - 258

JO - Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics

JF - Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics