Gamma-Ray Proton Interactions between 0.5 and 4.8 BeV

Crouch, H. R.; Hargraves, R.; Kendall, B.; Lanou, R. E.; Shapiro, A.; Widgoff, M.; Fischer, G.; Brenner, A. E.; Law, M. E.; Ronat, E.; Strauch, K.; Street, J. C.; Szymański, J.; Teal, J. D.; Bastien, Pierre; Eisenberg, Y.; Feld, Bernard T.; Fischer, V. K.; Pless, I. A.; Rogers, Andrew; Rogers, Charles William; Rosenson, L.; Watts, T.; Yamamoto, R. K.; Guerriero, L.; Salandin, G. A.

doi:10.1103/physrevlett.13.636

Cited by 42 publications

(1 citation statement)

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“…Several studies of the photoproduction of the Λ(1520) have been published; some report only cross sections, a few also report decay distributions or spin density matrix elements. Early measurements by Crouch et al [13] and Blanpied et al [14] at the Cambridge Electron Accelerator, Mistry et al [15] at Cornell, and Boyarski et al [16] at SLAC provided the first measurements of the γp → K + Λ(1520) differential and total cross sections.…”

Section: Previous Resultsmentioning

confidence: 99%

Measurement of Spin Density Matrix Elements in the Reaction y p to K+ Lambda(1520) Using CLAS at Jefferson Lab

Levine

2016

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This work presents a measurement of the spin density matrix elements of the Λ(1520) in the reaction γp → K + Λ(1520). The elements measured are ρ 11 , Re(ρ 31 ), and Re(ρ 3−1 ). The spin density matrix elements, together with differential cross sections, can provide information about the production mechanism of the Λ(1520). The data used is from the g11a run period, collected at the CLAS detector at Jefferson Lab. The Λ(1520) was detected via the pK − decay mode, and three topologies, p(K + )K − , pK + (K − ), and pK + K − , were studied to maximize kinematic coverage. The measurements cover the center-of-mass energy range from 2.04 GeV to 2.82 GeV and almost the full range of the production angle. These are the first measurements of these quantities over much of this kinematic region, and the large dataset allows us to use much finer binning than all previous measurements. These measurements do not match predictions from existing models and can provide the basis for a better theoretical understanding of Λ(1520) photoproduction.First of all, I would like to thank my advisor, Curtis Meyer, who has given me guidance and support for over six years, since my first semester at CMU. Obviously, this work would not exist with him. Thanks to Reinhard Schumacher for lending an ear whenever I had a tricky problem, and for help navigating the CLAS collaboration. Thanks also go to the rest of my thesis committee, Brian Quinn, Gregg Franklin, and Justin Stevens, whose tough questions and helpful comments were much appreciated and helped make this thesis better.Thanks to the rest of the CMU medium energy group as well. Yves Van Haarlem helped me with my first project here and Brian Vernarsky taught me about all the software I used for this analysis. Kei Moriya gave me the idea to work on the Λ(1520) in the first place and has been a friend and mentor. Thanks to the post-docs Paul Mattione, Haiyun Lu, and Vahe Mamyan for everything, but especially for ping-pong breaks. I have been lucky enough to share my office with extraordinary people: my wonderful current officemates Naomi Jarvis and Will McGinley and my completely excellent former officemate Megan Friend. I met Dao Ho even before I moved to Pittsburgh, and we've been friends since. Mike Staib has been great to talk to about both physics and non-physics matters.Huge thanks to all the members of the CLAS and GlueX collaborations. Literally none of my work would have been possible without you. Special thanks to the grad student contingent of both collaborations who always ensured that my trips to JLab were not just productive, but fun.Thanks so much to all of my fellow CMU grad students, you made grad school bearable. Special thanks to Ying Zhang, who was a great roommate, always up for watching a movie, or for a discussion on world politics. Udom Sae-Ueng, You-Cyuan Jhang, Yu Feng, Yutaro Iiyama, Patrick Mende, and Robert Haussman also deserve thanks; I can't even describe how much your friendship has meant to me. Zach McDargh has been a good friend and a steadfast source of ...

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