Measurement of the photon beam asymmetry in $\overrightarrow{\gamma }p\to K^{+}{\mathrm{\Sigma }}^0$ at $E_{\gamma }=8.5$ GeV

Journal Article · Thu Jun 25 00:00:00 EDT 2020 · Physical Review C

DOI:https://doi.org/10.1103/PhysRevC.101.065206· OSTI ID:1635167

Adhikari, S.; Ali, A.; Amaryan, M. ; Austregesilo, A.; Barbosa, F.; Barlow, J.; Barriga, E.; Barsotti, R.; Beattie, T. D.; Berdnikov, V. V.; Black, T.; Boeglin, W.; Briscoe, W. J.; Britton, T.; Brooks, W. K.; Cannon, B. E.; Cao, N.; Chudakov, E.; Cole, S.; Cortes, O. ; Crede, V.; Dalton, M. M.; Daniels, T.; Deur, A.; Dobbs, S.; Dolgolenko, A.; Dotel, R.; Dugger, M.; Dzhygadlo, R.; Egiyan, H.; Erbora, T.; Ernst, A.; Eugenio, P.; Fanelli, C.; Fegan, S.; Foda, A. M.; Foote, J.; Frye, J.; Furletov, S.; Gan, L.; Gasparian, A.; Gleason, C.; Goetzen, K.; Goncalves, A.; Goryachev, V. S.; Guo, L.; Hakobyan, H.; Hamdi, A.; Huber, G. M.; Hurley, A.; Ireland, D. G.; Ito, M. M.; Jarvis, N. S.; Jones, R. T.; Kakoyan, V.; Kalicy, G.; Kamel, M.; Kourkoumelis, C.; Kuleshov, S.; Larin, I.; Lawrence, D.; Lersch, D. I.; Li, H.; Li, W.; Liu, B.; Livingston, K.; Lolos, G. J.; Lyubovitskij, V.; Mack, D.; Marukyan, H.; Matveev, V.; McCaughan, M.; McCracken, M.; McGinley, W.; Meyer, C. A.; Miskimen, R.; Mitchell, R. E.; Nerling, F.; Ng, L.; Ni, H.; Ostrovidov, A. I.; Papandreou, Z.; Patsyuk, M.; Paudel, C.; Pauli, P.; Pedroni, R.; Pentchev, L.; Peters, K. J.; Phelps, W.; Pooser, E.; Qin, N.; Reinhold, J.; Ritchie, B. G.; Robison, L.; Romanov, D.; Romero, C.; Salgado, C.; Schertz, A. M.; Schumacher, R. A.; Schwiening, J.; Seth, K. K.; Shen, X.; Shepherd, M. R.; Smith, E. S.; Sober, D. I.; Somov, A.; Somov, S.; Soto, O.; Stevens, J. R.; Strakovsky, I. I.; Suresh, K.; Tarasov, V. V.; Taylor, S.; Teymurazyan, A.; Thiel, A.; Vasileiadis, G.; Whitlatch, T.; Wickramaarachchi, N. ; Williams, M.; Xiao, T.; Yang, Y.; Zarling, J.; Zhang, Z.; Zhou, Q.; Zhou, X.; Zihlmann, B.

We report measurements of the photon beam asymmetry $$\Sigma$$ for the reaction $$\vec{\gamma} p\to K^+\Sigma^0$$(1193) using the GlueX spectrometer in Hall D at Jefferson Lab. Data were collected using a linearly polarized photon beam in the energy range of 8.2-8.8 GeV incident on a liquid hydrogen target. The beam asymmetry $$\Sigma$$ was measured as a function of the Mandelstam variable $$t$$, and a single value of $$\Sigma$$ was extracted for events produced in the $$u$$-channel. These are the first exclusive measurements of the photon beam asymmetry $$\Sigma$$ for the reaction in this energy range. For the $$t$$-channel, the measured beam asymmetry is close to unity over the $$t$$-range studied, $-t=(0.1-1.4)~$(GeV/$$c$$)$$^{2}$$, with an average value of $$\Sigma = 1.00\pm 0.05$$. This agrees with theoretical models that describe the reaction via the natural-parity exchange of the $$K^{*}$$(892) Regge trajectory. A value of $$\Sigma = 0.41 \pm 0.09$$ is obtained for the $$u$$-channel integrated up to $-u=2.0$~(GeV/$$c$$)$$^{2}$$.

• Research Organization: Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States); Univ. of Massachusetts, Amherst, MA (United States); George Washington Univ., Ashburn, VA (United States)
• Sponsoring Organization: USDOE Office of Science (SC), Nuclear Physics (NP)
• Contributing Organization: GlueX Collaboration
• Grant/Contract Number: AC05-06OR23177; FG02-88ER40415; SC0016583
• OSTI ID: 1635167
• Alternate ID(s): OSTI ID: 1658583; OSTI ID: 1726250
• Report Number(s): JLAB-PHY-20-3169; DOE/OR-23177-4946; arXiv:2003.08038; PRVCAN; TRN: US2201336
• Journal Information: Physical Review C, Vol. 101, Issue 6; ISSN 2469-9985
• Publisher: American Physical Society (APS)
• Country of Publication: United States
• Language: English

Related Subjects

73 NUCLEAR PHYSICS AND RADIATION PHYSICS
Photonuclear reactions