LEPS - Laser Electron Photon Experiment at SPring-8

The Laser Electron Photon beamline at SPring-8 (LEPS) produces GeV photon beams by the backward Compton scattering of ultraviolet laser photons off 8 GeV electrons circulating in the SPring-8 synchrotron radiation ring. The beams are used for nuclear and hadron physics experiments by international collaborations. The first LEPS beam was produced in 1999 and the first physics run started in 2000.

Topics

• "Evidence of the Θ⁺ in the γd → K⁺K^- pn reaction" Phys. Rev. C79, 025210, 2009 published 27 Feb. 2009



• RCNP Workshop on "Quark Nuclear Physics at the LEPS2 Beamline" Jan. 8-9, 2007 at RCNP.


• Workshop on "LEPS/SPring-8 new beamline" was held on July 28-29, 2005 at RCNP.


• International Workshop PENTAQUARK04 was held on July 20-23, 2004 at SPring-8, Japan.


• Evidence for a Five-Quark S=+1 Baryon Resonance (2003.7.1)

LEPS2

• LEPS2 Website

Project

• Polarized HD Target

Overview of LEPS

• The LEPS Beamline
• The LEPS Detectors
• The LEPS Collaboration

• Photo Gallery

Recent Results, Publications and Documents

• Near-Threshold Λ(1520) Production by the γ p + Λ(1520) Reaction at Forward K⁺ Angles,
  H. Kohri, et al., Phys. Rev. Lett. 104, 172001 (2010) , arXiv:0906.0197 [hep-ex]
• Backward-angle η photoproduction from protons at E_γ=1.6-2.4 GeV,
  M. Sumihama, et al., Phys. Rev. C 80, 052201(R) (2009), arXiv:0910.0900v1 [nucl-ex]
• Measurement of the incoherent γd→φpn photoproduction near threshold,
  W.C. Chang, M. Miyabe, T. Nakano, et al., Phys.Lett.B684:6,2010
• Near-threshold photoproduction of Λ(1520) from protons and deuterons,
  N. Muramatsu, J.Y. Chen, W.C. Chang, et al., Phys.Rev.Lett.103:012001,2009, arXiv:0904.2034 [nucl-ex]
• Evidence of the Θ⁺ in the γd → K⁺K^-pn reaction,
  T. Nakano, N. Muramatsu, et al., Phys.Rev.C79:025210,2009, arXiv:0812.1035 [nucl-ex]
• Cross Sections and Beam Asymmetries for K⁺Σ^*- photoproduction from the deuteron at E_γ = 1.5-GeV - 2.4-GeV,
  K. Hicks, D. Keller, H. Kohri, et al., Phys.Rev.Lett.102:012501,2009, arXiv:0812.0771 [nucl-ex]
• Photoproduction of Λ(1405) and Σ⁰(1385) on the proton at E_γ = 1.5-2.4-GeV,
  M. Niiyama, H. Fujimura, et al., Phys.Rev.C78:035202,2008, arXiv:0805.4051 [hep-ex]
• Other Publications

Related Links

• LEPS User Information

• SPring-8

• Useful links for LEPS members

• www.hadron.jp Virtual Lab. of LEPS/SPring-8 new beamline project (limited access to project members)