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Measurement of Spin Density Matrix Elements in $\Lambda(1520)$ Photoproduction at 8.2-8.8 GeV

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arxiv 2107.12314 v2 pith:KWG2YEFR submitted 2021-07-26 nucl-ex hep-ex

GlueX Collaboration: S. Adhikari , C. S. Akondi , M. Albrecht , A. Ali , M. Amaryan , A. Asaturyan , A. Austregesilo , Z. Baldwin
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F. Barbosa J. Barlow E. Barriga R. Barsotti T. D. Beattie V. V. Berdnikov T. Black W. Boeglin W. J. Briscoe T. Britton W. K. Brooks E. Chudakov S. Cole P. L. Cole O. Cortes V. Crede M. M. Dalton T. Daniels A. Deur S. Dobbs A. Dolgolenko R. Dotel M. Dugger R. Dzhygadlo H. Egiyan T. Erbora A. Ernst P. Eugenio C. Fanelli S. Fegan J. Fitches A. M. Foda S. Furletov L. Gan H. Gao A. Gasparian C. Gleason K. Goetzen V. S. Goryachev L. Guo M. Hagen H. Hakobyan A. Hamdi J. Hernandez N. D. Hoffman G. Hou G. M. Huber A. Hurley D. G. Ireland M. M. Ito I. Jaegle N. S. Jarvis R. T. Jones V. Kakoyan G. Kalicy M. Kamel V. Khachatryan M. Khatchatryan C. Kourkoumelis S. Kuleshov A. LaDuke I. Larin D. Lawrence D. I. Lersch H. Li W. B. Li B. Liu K. Livingston G. J. Lolos K. Luckas V. Lyubovitskij D. Mack A. Mahmood H. Marukyan V. Matveev M. McCaughan M. McCracken C. A. Meyer R. Miskimen R. E. Mitchell K. Mizutani V. Neelamana F. Nerling L. Ng A. I. Ostrovidov Z. Papandreou C. Paudel P. Pauli R. Pedroni L. Pentchev K. J. Peters J. Reinhold B. G. Ritchie J. Ritman G. Rodriguez D. Romanov C. Romero K. Saldana C. Salgado S. Schadmand A. M. Schertz A. Schick A. Schmidt R. A. Schumacher J. Schwiening P. Sharp X. Shen M. R. Shepherd A. Smith E. S. Smith D. I. Sober A. Somov S. Somov O. Soto J. R. Stevens I. I. Strakovsky B. Sumner K. Suresh V. V. Tarasov S. Taylor A. Teymurazyan A. Thiel G. Vasileiadis T. Viducic T. Whitlatch N. Wickramaarachchi M. Williams Y. Yang J. Zarling Z. Zhang Z. Zhao J. Zhou X. Zhou Q. Zhou B. Zihlmann D. I. Glazier V. Mathieu
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classification nucl-exhep-ex
keywords lambdameasurementphotoproductiondensityelementsexchangegammamatrix
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abstract

We report on the measurement of spin density matrix elements of the $\Lambda(1520)$ in the photoproduction reaction $\gamma p\rightarrow \Lambda(1520)K^+$, via its subsequent decay to $K^{-}p$. The measurement was performed as part of the GlueX experimental program in Hall D at Jefferson Lab using a linearly polarized photon beam with $E_\gamma =$ 8.2-8.8 GeV. These are the first such measurements in this photon energy range. Results are presented in bins of momentum transfer squared, $-(t-t_\text{0})$. We compare the results with a Reggeon exchange model and determine that natural exchange amplitudes are dominant in $\Lambda(1520)$ photoproduction.

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    Regge amplitude fit to high-energy polarized pi- Delta++ photoproduction confirms pion dominance at small t and extracts pi N Delta coupling consistent with Delta decay plus first values for rho, b1, and a2 N Delta couplings.

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