Measurement of the beam-helicity asymmetry in photoproduction of π0η pairs on carbon, aluminum, and lead

A2 Collaboration at MAMI

doi:10.1016/j.physletb.2020.135243

Measurement of the beam-helicity asymmetry in photoproduction of π⁰η pairs on carbon, aluminum, and lead

A2 Collaboration at MAMI

Racah Institute of Physics

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

1 Scopus citations

Abstract

The beam-helicity asymmetry was measured, for the first time, in photoproduction of π⁰η pairs on carbon, aluminum, and lead, with the A2 experimental setup at MAMI. The results are compared to an earlier measurement on a free proton and to the corresponding theoretical calculations. The Mainz model is used to predict the beam-helicity asymmetry for the nuclear targets. The present results indicate that the photoproduction mechanism for π⁰η pairs on nuclei is similar to photoproduction on a free nucleon. This process is dominated by the D₃₃ partial wave with the ηΔ(1232) intermediate state.

Original language	American English
Article number	135243
Journal	Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
Volume	802
DOIs	https://doi.org/10.1016/j.physletb.2020.135243
State	Published - 10 Mar 2020

Bibliographical note

Funding Information:
The authors wish to acknowledge the excellent support of the accelerator group and operators of MAMI. We also thank A. Sarantsev and V. Nikonov on behalf of the BnGa PWA group. This work was supported by the Deutsche Forschungsgemeinschaft ( SFB443 , SFB/TR16 , and SFB1044 ), DFG-RFBR (Grant No. 09-02-91330 ), the European Community-Research Infrastructure Activity under the FP6 “Structuring the European Research Area” program (Hadron Physics, Contract No. RII3-CT-2004-506078 ), Schweizerischer Nationalfonds (Contract Nos. 200020-156983 , 132799 , 121781 , 117601 , 113511 ), the U.K. Science and Technology Facilities Council (STFC 57071/1 , 50727/1 ), the U.S. Department of Energy (Offices of Science and Nuclear Physics, Award Nos. DE-FG02-99-ER41110 , DE-FG02-88ER40415 , DE-SC0014323 ) and National Science Foundation (Grant Nos. PHY-1039130 , IIA-1358175 ), INFN (Italy), and NSERC (Canada). We also acknowledge the support of the Carl-Zeiss-Stiftung . A. Fix acknowledges additional support from the Tomsk Polytechnic University competitiveness enhancement program. We thank the undergraduate students of Mount Allison University and The George Washington University for their assistance.

Funding Information:
The authors wish to acknowledge the excellent support of the accelerator group and operators of MAMI. We also thank A. Sarantsev and V. Nikonov on behalf of the BnGa PWA group. This work was supported by the Deutsche Forschungsgemeinschaft (SFB443, SFB/TR16, and SFB1044), DFG-RFBR (Grant No. 09-02-91330), the European Community-Research Infrastructure Activity under the FP6 “Structuring the European Research Area” program (Hadron Physics, Contract No. RII3-CT-2004-506078), Schweizerischer Nationalfonds (Contract Nos. 200020-156983, 132799, 121781, 117601, 113511), the U.K. Science and Technology Facilities Council (STFC 57071/1, 50727/1), the U.S. Department of Energy (Offices of Science and Nuclear Physics, Award Nos. DE-FG02-99-ER41110, DE-FG02-88ER40415, DE-SC0014323) and National Science Foundation (Grant Nos. PHY-1039130, IIA-1358175), INFN (Italy), and NSERC (Canada). We also acknowledge the support of the Carl-Zeiss-Stiftung. A. Fix acknowledges additional support from the Tomsk Polytechnic University competitiveness enhancement program. We thank the undergraduate students of Mount Allison University and The George Washington University for their assistance.

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© 2020 The Author(s)

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10.1016/j.physletb.2020.135243

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title = "Measurement of the beam-helicity asymmetry in photoproduction of π0η pairs on carbon, aluminum, and lead",

abstract = "The beam-helicity asymmetry was measured, for the first time, in photoproduction of π0η pairs on carbon, aluminum, and lead, with the A2 experimental setup at MAMI. The results are compared to an earlier measurement on a free proton and to the corresponding theoretical calculations. The Mainz model is used to predict the beam-helicity asymmetry for the nuclear targets. The present results indicate that the photoproduction mechanism for π0η pairs on nuclei is similar to photoproduction on a free nucleon. This process is dominated by the D33 partial wave with the ηΔ(1232) intermediate state.",

author = "{A2 Collaboration at MAMI} and V. Sokhoyan and S. Prakhov and A. Fix and S. Abt and P. Achenbach and P. Adlarson and F. Afzal and P. Aguar-Bartolom{\'e} and Z. Ahmed and K. Altangerel and Annand, {J. R.M.} and Arends, {H. J.} and K. Bantawa and M. Bashkanov and R. Beck and M. Biroth and Borisov, {N. S.} and A. Braghieri and Briscoe, {W. J.} and S. Cherepnya and F. Cividini and C. Collicott and S. Costanza and A. Denig and M. Dieterle and Downie, {E. J.} and P. Drexler and {Ferretti Bondy}, {M. I.} and Fil'kov, {L. V.} and S. Gardner and S. Garni and Glazier, {D. I.} and I. Gorodnov and W. Gradl and M. G{\"u}nther and Gurevich, {G. M.} and L. Heijkenskj{\"o}ld and D. Hornidge and Huber, {G. M.} and A. K{\"a}ser and Kashevarov, {V. L.} and S. Kay and I. Keshelashvili and R. Kondratiev and M. Korolija and B. Krusche and A. Lazarev and K. Livingston and S. Lutterer and G. Ron",

note = "Funding Information: The authors wish to acknowledge the excellent support of the accelerator group and operators of MAMI. We also thank A. Sarantsev and V. Nikonov on behalf of the BnGa PWA group. This work was supported by the Deutsche Forschungsgemeinschaft ( SFB443 , SFB/TR16 , and SFB1044 ), DFG-RFBR (Grant No. 09-02-91330 ), the European Community-Research Infrastructure Activity under the FP6 “Structuring the European Research Area” program (Hadron Physics, Contract No. RII3-CT-2004-506078 ), Schweizerischer Nationalfonds (Contract Nos. 200020-156983 , 132799 , 121781 , 117601 , 113511 ), the U.K. Science and Technology Facilities Council (STFC 57071/1 , 50727/1 ), the U.S. Department of Energy (Offices of Science and Nuclear Physics, Award Nos. DE-FG02-99-ER41110 , DE-FG02-88ER40415 , DE-SC0014323 ) and National Science Foundation (Grant Nos. PHY-1039130 , IIA-1358175 ), INFN (Italy), and NSERC (Canada). We also acknowledge the support of the Carl-Zeiss-Stiftung . A. Fix acknowledges additional support from the Tomsk Polytechnic University competitiveness enhancement program. We thank the undergraduate students of Mount Allison University and The George Washington University for their assistance. Funding Information: The authors wish to acknowledge the excellent support of the accelerator group and operators of MAMI. We also thank A. Sarantsev and V. Nikonov on behalf of the BnGa PWA group. This work was supported by the Deutsche Forschungsgemeinschaft (SFB443, SFB/TR16, and SFB1044), DFG-RFBR (Grant No. 09-02-91330), the European Community-Research Infrastructure Activity under the FP6 “Structuring the European Research Area” program (Hadron Physics, Contract No. RII3-CT-2004-506078), Schweizerischer Nationalfonds (Contract Nos. 200020-156983, 132799, 121781, 117601, 113511), the U.K. Science and Technology Facilities Council (STFC 57071/1, 50727/1), the U.S. Department of Energy (Offices of Science and Nuclear Physics, Award Nos. DE-FG02-99-ER41110, DE-FG02-88ER40415, DE-SC0014323) and National Science Foundation (Grant Nos. PHY-1039130, IIA-1358175), INFN (Italy), and NSERC (Canada). We also acknowledge the support of the Carl-Zeiss-Stiftung. A. Fix acknowledges additional support from the Tomsk Polytechnic University competitiveness enhancement program. We thank the undergraduate students of Mount Allison University and The George Washington University for their assistance. Publisher Copyright: {\textcopyright} 2020 The Author(s)",

year = "2020",

month = mar,

day = "10",

doi = "10.1016/j.physletb.2020.135243",

language = "American English",

volume = "802",

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

issn = "0370-2693",

publisher = "Elsevier",

}

TY - JOUR

T1 - Measurement of the beam-helicity asymmetry in photoproduction of π0η pairs on carbon, aluminum, and lead

AU - A2 Collaboration at MAMI

AU - Sokhoyan, V.

AU - Prakhov, S.

AU - Fix, A.

AU - Abt, S.

AU - Achenbach, P.

AU - Adlarson, P.

AU - Afzal, F.

AU - Aguar-Bartolomé, P.

AU - Ahmed, Z.

AU - Altangerel, K.

AU - Annand, J. R.M.

AU - Arends, H. J.

AU - Bantawa, K.

AU - Bashkanov, M.

AU - Beck, R.

AU - Biroth, M.

AU - Borisov, N. S.

AU - Braghieri, A.

AU - Briscoe, W. J.

AU - Cherepnya, S.

AU - Cividini, F.

AU - Collicott, C.

AU - Costanza, S.

AU - Denig, A.

AU - Dieterle, M.

AU - Downie, E. J.

AU - Drexler, P.

AU - Ferretti Bondy, M. I.

AU - Fil'kov, L. V.

AU - Gardner, S.

AU - Garni, S.

AU - Glazier, D. I.

AU - Gorodnov, I.

AU - Gradl, W.

AU - Günther, M.

AU - Gurevich, G. M.

AU - Heijkenskjöld, L.

AU - Hornidge, D.

AU - Huber, G. M.

AU - Käser, A.

AU - Kashevarov, V. L.

AU - Kay, S.

AU - Keshelashvili, I.

AU - Kondratiev, R.

AU - Korolija, M.

AU - Krusche, B.

AU - Lazarev, A.

AU - Livingston, K.

AU - Lutterer, S.

AU - Ron, G.

N1 - Funding Information: The authors wish to acknowledge the excellent support of the accelerator group and operators of MAMI. We also thank A. Sarantsev and V. Nikonov on behalf of the BnGa PWA group. This work was supported by the Deutsche Forschungsgemeinschaft ( SFB443 , SFB/TR16 , and SFB1044 ), DFG-RFBR (Grant No. 09-02-91330 ), the European Community-Research Infrastructure Activity under the FP6 “Structuring the European Research Area” program (Hadron Physics, Contract No. RII3-CT-2004-506078 ), Schweizerischer Nationalfonds (Contract Nos. 200020-156983 , 132799 , 121781 , 117601 , 113511 ), the U.K. Science and Technology Facilities Council (STFC 57071/1 , 50727/1 ), the U.S. Department of Energy (Offices of Science and Nuclear Physics, Award Nos. DE-FG02-99-ER41110 , DE-FG02-88ER40415 , DE-SC0014323 ) and National Science Foundation (Grant Nos. PHY-1039130 , IIA-1358175 ), INFN (Italy), and NSERC (Canada). We also acknowledge the support of the Carl-Zeiss-Stiftung . A. Fix acknowledges additional support from the Tomsk Polytechnic University competitiveness enhancement program. We thank the undergraduate students of Mount Allison University and The George Washington University for their assistance. Funding Information: The authors wish to acknowledge the excellent support of the accelerator group and operators of MAMI. We also thank A. Sarantsev and V. Nikonov on behalf of the BnGa PWA group. This work was supported by the Deutsche Forschungsgemeinschaft (SFB443, SFB/TR16, and SFB1044), DFG-RFBR (Grant No. 09-02-91330), the European Community-Research Infrastructure Activity under the FP6 “Structuring the European Research Area” program (Hadron Physics, Contract No. RII3-CT-2004-506078), Schweizerischer Nationalfonds (Contract Nos. 200020-156983, 132799, 121781, 117601, 113511), the U.K. Science and Technology Facilities Council (STFC 57071/1, 50727/1), the U.S. Department of Energy (Offices of Science and Nuclear Physics, Award Nos. DE-FG02-99-ER41110, DE-FG02-88ER40415, DE-SC0014323) and National Science Foundation (Grant Nos. PHY-1039130, IIA-1358175), INFN (Italy), and NSERC (Canada). We also acknowledge the support of the Carl-Zeiss-Stiftung. A. Fix acknowledges additional support from the Tomsk Polytechnic University competitiveness enhancement program. We thank the undergraduate students of Mount Allison University and The George Washington University for their assistance. Publisher Copyright: © 2020 The Author(s)

PY - 2020/3/10

Y1 - 2020/3/10

N2 - The beam-helicity asymmetry was measured, for the first time, in photoproduction of π0η pairs on carbon, aluminum, and lead, with the A2 experimental setup at MAMI. The results are compared to an earlier measurement on a free proton and to the corresponding theoretical calculations. The Mainz model is used to predict the beam-helicity asymmetry for the nuclear targets. The present results indicate that the photoproduction mechanism for π0η pairs on nuclei is similar to photoproduction on a free nucleon. This process is dominated by the D33 partial wave with the ηΔ(1232) intermediate state.

AB - The beam-helicity asymmetry was measured, for the first time, in photoproduction of π0η pairs on carbon, aluminum, and lead, with the A2 experimental setup at MAMI. The results are compared to an earlier measurement on a free proton and to the corresponding theoretical calculations. The Mainz model is used to predict the beam-helicity asymmetry for the nuclear targets. The present results indicate that the photoproduction mechanism for π0η pairs on nuclei is similar to photoproduction on a free nucleon. This process is dominated by the D33 partial wave with the ηΔ(1232) intermediate state.

UR - http://www.scopus.com/inward/record.url?scp=85078243753&partnerID=8YFLogxK

U2 - 10.1016/j.physletb.2020.135243

DO - 10.1016/j.physletb.2020.135243

M3 - Article

AN - SCOPUS:85078243753

SN - 0370-2693

VL - 802

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

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

M1 - 135243

ER -

Measurement of the beam-helicity asymmetry in photoproduction of π⁰η pairs on carbon, aluminum, and lead

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