Measurement of Spin-Density Matrix Elements in $Δ^{++}(1232)$ photoproduction

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Hauptverfasser:	Afzal, F., Akondi, C. S., Albrecht, M., Amaryan, M., Arrigo, S., Arroyave, V., Asaturyan, A., Austregesilo, A., Baldwin, Z., Barbosa, F., Barlow, J., Barriga, E., Barsotti, R., Barton, D., Baturin, V., Berdnikov, V. V., Black, T., Boeglin, W., Boer, M., Briscoe, W. J., Britton, T., Cao, S., Chudakov, E., Chung, G., Cole, P. L., Cortes, O., Crede, V., Dalton, M. M., Darulis, D., Deur, A., Dobbs, S., Dolgolenko, A., Dugger, M., Dzhygadlo, R., Ebersole, D., Edo, M., Egiyan, H., Erbora, T., Eugenio, P., Fabrizi, A., Fanelli, C., Fang, S., Fitches, J., Foda, A. M., Furletov, S., Gan, L., Gao, H., Gardner, A., Gasparian, A., Glazier, D. I., Gleason, C., Goryachev, V. S., Grube, B., Guo, J., Guo, L., Hernandez, J., Hernandez, K., Hoffman, N. D., Hornidge, D., Hou, G., Hurck, P., Hurley, A., Imoehl, W., Ireland, D. G., Ito, M. M., Jaegle, I., Jarvis, N. S., Jeske, T., Jing, M., Jones, R. T., Kakoyan, V., Kalicy, G., Khachatryan, V., Kourkoumelis, C., LaDuke, A., Larin, I., Lawrence, D., Lersch, D. I., Li, H., Liu, B., Livingston, K., Lolos, G. J., Lorenti, L., Lyubovitskij, V., Ma, R., Mack, D., Mahmood, A., Marukyan, H., Matveev, V., McCaughan, M., McCracken, M., Meyer, C. A., Miskimen, R., Mitchell, R. E., Mizutani, K., Neelamana, V., Ng, L., Nissen, E., Orešić, S., Ostrovidov, A. I., Papandreou, Z., Paudel, C., Pedroni, R., Pentchev, L., Peters, K. J., Prather, E., Rakshit, S., Reinhold, J., Remington, A., Ritchie, B. G., Ritman, J., Rodriguez, G., Romanov, D., Saldana, K., Salgado, C., Schadmand, S., Schertz, A. M., Scheuer, K., Schick, A., Schmidt, A., Schumacher, R. A., Schwiening, J., Septian, N., Sharp, P., Shen, X., Shepherd, M. R., Sikes, J., Smith, A., Smith, E. S., Sober, D. I., Somov, A., Somov, S., Stevens, J. R., Strakovsky, I. I., Sumner, B., Suresh, K., Tarasov, V. V., Taylor, S., Teymurazyan, A., Thiel, A., Viducic, T., Whitlatch, T., Wickramaarachchi, N., Wunderlich, Y., Yu, B., Zarling, J., Zhang, Z., Zhou, X., Zihlmann, B.
Format:	Preprint
Veröffentlicht:	2024
Schlagworte:	Nuclear Experiment
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_version_	1866911968209666048
author	Afzal, F. Akondi, C. S. Albrecht, M. Amaryan, M. Arrigo, S. Arroyave, V. Asaturyan, A. Austregesilo, A. Baldwin, Z. Barbosa, F. Barlow, J. Barriga, E. Barsotti, R. Barton, D. Baturin, V. Berdnikov, V. V. Black, T. Boeglin, W. Boer, M. Briscoe, W. J. Britton, T. Cao, S. Chudakov, E. Chung, G. Cole, P. L. Cortes, O. Crede, V. Dalton, M. M. Darulis, D. Deur, A. Dobbs, S. Dolgolenko, A. Dugger, M. Dzhygadlo, R. Ebersole, D. Edo, M. Egiyan, H. Erbora, T. Eugenio, P. Fabrizi, A. Fanelli, C. Fang, S. Fitches, J. Foda, A. M. Furletov, S. Gan, L. Gao, H. Gardner, A. Gasparian, A. Glazier, D. I. Gleason, C. Goryachev, V. S. Grube, B. Guo, J. Guo, L. Hernandez, J. Hernandez, K. Hoffman, N. D. Hornidge, D. Hou, G. Hurck, P. Hurley, A. Imoehl, W. Ireland, D. G. Ito, M. M. Jaegle, I. Jarvis, N. S. Jeske, T. Jing, M. Jones, R. T. Kakoyan, V. Kalicy, G. Khachatryan, V. Kourkoumelis, C. LaDuke, A. Larin, I. Lawrence, D. Lersch, D. I. Li, H. Liu, B. Livingston, K. Lolos, G. J. Lorenti, L. Lyubovitskij, V. Ma, R. Mack, D. Mahmood, A. Marukyan, H. Matveev, V. McCaughan, M. McCracken, M. Meyer, C. A. Miskimen, R. Mitchell, R. E. Mizutani, K. Neelamana, V. Ng, L. Nissen, E. Orešić, S. Ostrovidov, A. I. Papandreou, Z. Paudel, C. Pedroni, R. Pentchev, L. Peters, K. J. Prather, E. Rakshit, S. Reinhold, J. Remington, A. Ritchie, B. G. Ritman, J. Rodriguez, G. Romanov, D. Saldana, K. Salgado, C. Schadmand, S. Schertz, A. M. Scheuer, K. Schick, A. Schmidt, A. Schumacher, R. A. Schwiening, J. Septian, N. Sharp, P. Shen, X. Shepherd, M. R. Sikes, J. Smith, A. Smith, E. S. Sober, D. I. Somov, A. Somov, S. Stevens, J. R. Strakovsky, I. I. Sumner, B. Suresh, K. Tarasov, V. V. Taylor, S. Teymurazyan, A. Thiel, A. Viducic, T. Whitlatch, T. Wickramaarachchi, N. Wunderlich, Y. Yu, B. Zarling, J. Zhang, Z. Zhou, X. Zihlmann, B.
author_facet	Afzal, F. Akondi, C. S. Albrecht, M. Amaryan, M. Arrigo, S. Arroyave, V. Asaturyan, A. Austregesilo, A. Baldwin, Z. Barbosa, F. Barlow, J. Barriga, E. Barsotti, R. Barton, D. Baturin, V. Berdnikov, V. V. Black, T. Boeglin, W. Boer, M. Briscoe, W. J. Britton, T. Cao, S. Chudakov, E. Chung, G. Cole, P. L. Cortes, O. Crede, V. Dalton, M. M. Darulis, D. Deur, A. Dobbs, S. Dolgolenko, A. Dugger, M. Dzhygadlo, R. Ebersole, D. Edo, M. Egiyan, H. Erbora, T. Eugenio, P. Fabrizi, A. Fanelli, C. Fang, S. Fitches, J. Foda, A. M. Furletov, S. Gan, L. Gao, H. Gardner, A. Gasparian, A. Glazier, D. I. Gleason, C. Goryachev, V. S. Grube, B. Guo, J. Guo, L. Hernandez, J. Hernandez, K. Hoffman, N. D. Hornidge, D. Hou, G. Hurck, P. Hurley, A. Imoehl, W. Ireland, D. G. Ito, M. M. Jaegle, I. Jarvis, N. S. Jeske, T. Jing, M. Jones, R. T. Kakoyan, V. Kalicy, G. Khachatryan, V. Kourkoumelis, C. LaDuke, A. Larin, I. Lawrence, D. Lersch, D. I. Li, H. Liu, B. Livingston, K. Lolos, G. J. Lorenti, L. Lyubovitskij, V. Ma, R. Mack, D. Mahmood, A. Marukyan, H. Matveev, V. McCaughan, M. McCracken, M. Meyer, C. A. Miskimen, R. Mitchell, R. E. Mizutani, K. Neelamana, V. Ng, L. Nissen, E. Orešić, S. Ostrovidov, A. I. Papandreou, Z. Paudel, C. Pedroni, R. Pentchev, L. Peters, K. J. Prather, E. Rakshit, S. Reinhold, J. Remington, A. Ritchie, B. G. Ritman, J. Rodriguez, G. Romanov, D. Saldana, K. Salgado, C. Schadmand, S. Schertz, A. M. Scheuer, K. Schick, A. Schmidt, A. Schumacher, R. A. Schwiening, J. Septian, N. Sharp, P. Shen, X. Shepherd, M. R. Sikes, J. Smith, A. Smith, E. S. Sober, D. I. Somov, A. Somov, S. Stevens, J. R. Strakovsky, I. I. Sumner, B. Suresh, K. Tarasov, V. V. Taylor, S. Teymurazyan, A. Thiel, A. Viducic, T. Whitlatch, T. Wickramaarachchi, N. Wunderlich, Y. Yu, B. Zarling, J. Zhang, Z. Zhou, X. Zihlmann, B.
contents	We measure the spin-density matrix elements (SDMEs) of the $Δ^{++}(1232)$ in the photoproduction reaction $γp \to π^-Δ^{++}(1232)$ with the GlueX experiment in Hall D at Jefferson Lab. The measurement uses a linearly--polarized photon beam with energies from $8.2$ to $8.8$~GeV and the statistical precision of the SDMEs exceeds the previous measurement by three orders of magnitude for the momentum transfer squared region below $1.4$ GeV$^2$. The data are sensitive to the previously undetermined relative sign between couplings in existing Regge-exchange models. Linear combinations of the extracted SDMEs allow for a decomposition into natural and unnatural--exchange amplitudes. We find that the unnatural exchange plays an important role in the low momentum transfer region.
format	Preprint
id	arxiv_https___arxiv_org_abs_2406_12829
institution	arXiv
publishDate	2024
record_format	arxiv
spellingShingle	Measurement of Spin-Density Matrix Elements in $Δ^{++}(1232)$ photoproduction Afzal, F. Akondi, C. S. Albrecht, M. Amaryan, M. Arrigo, S. Arroyave, V. Asaturyan, A. Austregesilo, A. Baldwin, Z. Barbosa, F. Barlow, J. Barriga, E. Barsotti, R. Barton, D. Baturin, V. Berdnikov, V. V. Black, T. Boeglin, W. Boer, M. Briscoe, W. J. Britton, T. Cao, S. Chudakov, E. Chung, G. Cole, P. L. Cortes, O. Crede, V. Dalton, M. M. Darulis, D. Deur, A. Dobbs, S. Dolgolenko, A. Dugger, M. Dzhygadlo, R. Ebersole, D. Edo, M. Egiyan, H. Erbora, T. Eugenio, P. Fabrizi, A. Fanelli, C. Fang, S. Fitches, J. Foda, A. M. Furletov, S. Gan, L. Gao, H. Gardner, A. Gasparian, A. Glazier, D. I. Gleason, C. Goryachev, V. S. Grube, B. Guo, J. Guo, L. Hernandez, J. Hernandez, K. Hoffman, N. D. Hornidge, D. Hou, G. Hurck, P. Hurley, A. Imoehl, W. Ireland, D. G. Ito, M. M. Jaegle, I. Jarvis, N. S. Jeske, T. Jing, M. Jones, R. T. Kakoyan, V. Kalicy, G. Khachatryan, V. Kourkoumelis, C. LaDuke, A. Larin, I. Lawrence, D. Lersch, D. I. Li, H. Liu, B. Livingston, K. Lolos, G. J. Lorenti, L. Lyubovitskij, V. Ma, R. Mack, D. Mahmood, A. Marukyan, H. Matveev, V. McCaughan, M. McCracken, M. Meyer, C. A. Miskimen, R. Mitchell, R. E. Mizutani, K. Neelamana, V. Ng, L. Nissen, E. Orešić, S. Ostrovidov, A. I. Papandreou, Z. Paudel, C. Pedroni, R. Pentchev, L. Peters, K. J. Prather, E. Rakshit, S. Reinhold, J. Remington, A. Ritchie, B. G. Ritman, J. Rodriguez, G. Romanov, D. Saldana, K. Salgado, C. Schadmand, S. Schertz, A. M. Scheuer, K. Schick, A. Schmidt, A. Schumacher, R. A. Schwiening, J. Septian, N. Sharp, P. Shen, X. Shepherd, M. R. Sikes, J. Smith, A. Smith, E. S. Sober, D. I. Somov, A. Somov, S. Stevens, J. R. Strakovsky, I. I. Sumner, B. Suresh, K. Tarasov, V. V. Taylor, S. Teymurazyan, A. Thiel, A. Viducic, T. Whitlatch, T. Wickramaarachchi, N. Wunderlich, Y. Yu, B. Zarling, J. Zhang, Z. Zhou, X. Zihlmann, B. Nuclear Experiment We measure the spin-density matrix elements (SDMEs) of the $Δ^{++}(1232)$ in the photoproduction reaction $γp \to π^-Δ^{++}(1232)$ with the GlueX experiment in Hall D at Jefferson Lab. The measurement uses a linearly--polarized photon beam with energies from $8.2$ to $8.8$~GeV and the statistical precision of the SDMEs exceeds the previous measurement by three orders of magnitude for the momentum transfer squared region below $1.4$ GeV$^2$. The data are sensitive to the previously undetermined relative sign between couplings in existing Regge-exchange models. Linear combinations of the extracted SDMEs allow for a decomposition into natural and unnatural--exchange amplitudes. We find that the unnatural exchange plays an important role in the low momentum transfer region.
title	Measurement of Spin-Density Matrix Elements in $Δ^{++}(1232)$ photoproduction
topic	Nuclear Experiment
url	https://arxiv.org/abs/2406.12829

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