Abstract
In the J-PARC E27 experiment, we search for a K − pp bound state via the d(π +, K +) reaction at 1.7 GeV/c at the K1.8 beam line. The binding energy and decay width of the K − pp bound state can be obtained in the missing mass measurement with a good energy resolution of 2 MeV/c 2. A range counter array (RCA) was constructed to detect the two high-momentum protons from the K − pp decay and to reduce the background such as quasi-free hyperon production. Recently, we have carried out a pilot run in June, 2012. The d(π +, K +) missing-mass spectrum has been obtained for the first time. In this report, an overview of the E27 experiment and a preliminary result on this pilot run are presented.
This is a preview of subscription content, log in via an institution to check access.
Similar content being viewed by others
References
Yamazaki T., Akaishi Y.: Nuclear \({{\overline{K}}}\) bound states in light nuclei. Phys. Rev. C 65, (2002)
Ivanov, A.N., Kienle, P., Marton, J., Widmann, E.: Phenomenological model of the Kaonic Nuclear Cluster K − pp in the ground state. arXiv:nucl-th/0512037
Shevchenko N.V., Gal A., Mares J., Revai J.: anti-K NN quasi-bound state and the anti-K N interaction: Coupled-channel Faddeev calculations of the anti-K NN - pi Sigma N system. Phys. Rev. C 76, 044004 (2007)
Ikeda Y., Sato T.: Strange dibaryon resonance in the anti-K NN - pi Sigma N system. Phys. Rev. C 76, 035203 (2007)
Doté A., Hyodo T., Weise W.: K −pp system with chiral SU(3) effective interaction. Nucl. Phys. A 804, 197 (2008)
Wycech S., Green A.M.: Variational calculations for K-few-nucleon systems. Phys. Rev. C 79, 014001 (2009)
Barnea N., Gal A., Liverts E.Z.: Realistic calculations of \({{{\rm \overline{K} }}}\) NN, \({{{\rm \overline{K} }}}\) NNN, and \({{{\rm \overline{K}\,\overline{K} }}}\) NN quasibound states. Phys. Lett B 712, 132 (2012)
Bayar M., Oset E.: Improved Fixed Center Approximation of the Faddeev equations for the \({{{\rm \overline{K} }}}\) NN system with S = 0. Nucl. Phys. A 883, 57 (2012)
Agnello M. et al.: Evidence for a kaon-bound state K −pp produced in K − absorption reactions at rest. Phys. Rev. Lett 94, 212303 (2005)
Yamazaki T. et al.: Indication of a deeply bound compact K-pp state formed in the pp -> p Lambda K+ reaction at 2.85 GeV. Phys. Rev. Lett 104, 132502 (2010)
Magas V.K., Oset E., Ramos A., Toki H.: A Critical view on the deeply bound K −pp system. Phys. Rev. C 74, 025206 (2006)
Yamazaki T., Akaishi Y.: Emission spectra and invariant masses of Lambda and p in the stopped-K-NN absorption process in He-4 and Li-6. Nucl. Phys. A 792, 229 (2007)
Yamazaki T., Akaishi Y.: The basic anti-K nuclear cluster K- pp and its enhanced formation in the p + p —> K+ +X reaction. Phys. Rev. C 76, 045201 (2007)
Tanaka K.H. et al.: Construction and status of the Hadron Experimental Hall. Nucl. Phys. A 835, 81 (2010)
Shirotori K. et al.: Search for the Θ + pentaquark via the π–p→K–X reaction at 1.92 GeV/c. Phys. Rev. Lett 109, 132002 (2012)
Candlin D.J. et al.: Differential cross-section and polarization for pi+ p —> K+ sigma+ at 26 momenta between 1.282-GeV/c and 2.473-GeV/c. Nucl. Phys. B 226, 1 (1983)
Author information
Authors and Affiliations
Corresponding author
Rights and permissions
About this article
Cite this article
Ichikawa, Y., Bhang, H.C., Bufalino, S. et al. J-PARC E27 Experiment to Search for a Nuclear Kaon Bound State K − pp . Few-Body Syst 54, 1191–1194 (2013). https://doi.org/10.1007/s00601-013-0668-3
Received:
Accepted:
Published:
Issue Date:
DOI: https://doi.org/10.1007/s00601-013-0668-3