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arxiv: 2501.03091 · v1 · pith:QOVY4PN2new · submitted 2025-01-06 · ⚛️ nucl-ex · hep-ex

First Measurement of a⁰₂(1320) Polarized Photoproduction Cross Section

GlueX Collaboration: F. Afzal , C. S. Akondi , M. Albrecht , M. Amaryan , S. Arrigo , V. Arroyave , A. Asaturyan , A. Austregesilo
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Z. Baldwin F. Barbosa J. Barlow E. Barriga R. Barsotti D. Barton V. Baturin V. V. Berdnikov T. Black W. Boeglin M. Boer W. J. Briscoe T. Britton S. Cao E. Chudakov G. Chung P. L. Cole O. Cortes V. Crede M. M. Dalton D. Darulis A. Deur S. Dobbs A. Dolgolenko M. Dugger R. Dzhygadlo D. Ebersole M. Edo H. Egiyan T. Erbora P. Eugenio A. Fabrizi C. Fanelli S. Fang J. Fitches A. M. Foda S. Furletov L. Gan H. Gao A. Gardner A. Gasparian D. I. Glazier C. Gleason V. S. Goryachev B. Grube J. Guo L. Guo J. Hernandez K. Hernandez N. D. Hoffman D. Hornidge G. Hou P. Hurck A. Hurley W. Imoehl D. G. Ireland M. M. Ito I. Jaegle N. S. Jarvis T. Jeske M. Jing R. T. Jones V. Kakoyan G. Kalicy V. Khachatryan C. Kourkoumelis A. LaDuke I. Larin D. Lawrence D. I. Lersch H. Li B. Liu K. Livingston G. J. Lolos L. Lorenti V. Lyubovitskij R. Ma A. Mahmood H. Marukyan V. Matveev M. McCaughan M. McCracken C. A. Meyer R. Miskimen R. E. Mitchell K. Mizutani P. Moran V. Neelamana L. Ng E. Nissen S. Ore\v{s}i\'c A. I. Ostrovidov Z. Papandreou C. Paudel R. Pedroni L. Pentchev K. J. Peters E. Prather L. Puthiya Veetil S. Rakshit J. Reinhold A. Remington B. G. Ritchie J. Ritman G. Rodriguez D. Romanov K. Saldana C. Salgado S. Schadmand A. M. Schertz K. Scheuer A. Schick A. Schmidt R. A. Schumacher J. Schwiening M. Scott N. Septian P. Sharp X. Shen M. R. Shepherd J. Sikes A. Smith E. S. Smith D. I. Sober A. Somov S. Somov J. R. Stevens I. I. Strakovsky B. Sumner K. Suresh V. V. Tarasov S. Taylor A. Teymurazyan A. Thiel T. Viducic T. Whitlatch N. Wickramaarachchi Y. Wunderlich B. Yu J. Zarling Z. Zhang X. Zhou B. Zihlmann
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classification ⚛️ nucl-ex hep-ex
keywords firstphotoproductionbeamcrosssectiontimeallowsamplitudes
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We measure for the first time the differential photoproduction cross section $d\sigma/dt$ of the $a_2(1320)$ meson at an average photon beam energy of 8.5~GeV, using data with an integrated luminosity of 104~pb$^{-1}$ collected by the GlueX experiment. We fully reconstruct the $\gamma p \to \eta\pi^0 p$ reaction and perform a partial-wave analysis in the $a_2(1320)$ mass region with amplitudes that incorporate the linear polarization of the beam. This allows us to separate for the first time the contributions of natural- and unnatural-parity exchanges. These measurements provide novel information about the photoproduction mechanism, which is critical for the search for spin-exotic states.

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