Abstract
The total cross-section of the pp → nK+Σ+ reaction was measured at COSY using a proton beam with a momentum of p beam = 2.95 GeV/c, corresponding to an excess energy of ε = 129 MeV. The neutron detector COSYnus was added to the time-of-flight spectrometer COSY-TOF which tracks charged primary and secondary particles. Thus a complete reconstruction of the exit channel was feasible by exploiting for both neutron and kaon their time and direction of flight as well as the decay of the Σ+-hyperon into a neutral and a charged particle. The cross-section was determined to be between σ = 2.0 and 5.9 μb with 68% confidence. The experimental data published so far by various groups for this reaction are assessed as a whole. We conclude that either the theoretical models lack some important aspect of the reaction mechanism if one takes the experimental data at face value, or the experimental data are inconsistent and therefore theoretical descriptions must fail.
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References
M. Abdel-Bary et al., Eur. Phys. J. A 46, 27 (2010).
M. Abdel-Bary et al., Eur. Phys. J. A 48, 23 (2012).
R.I. Louttit et al., Phys. Rev. 123, 1465 (1961).
W. Chinowsky et al., Phys. Rev. 165, 1466 (1968).
I. Sondhi, Phys. Lett. B 26, 645 (1968).
UCLA 1033 (1968) PhD Thesis.
T. Rozek et al., Phys. Lett. B 643, 251 (2006).
Yu. Valdau et al., Phys. Lett. B 652, 245 (2007).
Yu. Valdau et al., Phys. Rev. C 81, 045208 (2010).
A. Budzanowski et al., Phys. Lett. B 692, 10 (2010).
A. Sibirtsev et al., Eur. Phys. J. A 32, 229 (2007).
W.J. Hogan et al., Phys. Rev. 166, 166 (1968).
J.T. Reed et al., Phys. Rev. 168, 1495 (1968).
R. Siebert et al., Nucl. Phys. A 567, 819 (1994).
Yu. Valdau, C. Wilkin, Phys. Lett. B 696, 23 (2011).
R. Bilger et al., Phys. Lett. B 420, 217 (1998).
A. Hassan et al., Nucl. Instrum. Methods Phys. Res. A 425, 403 (1999).
M. Dahmen et al., Nucl. Instrum. Methods Phys. Res. A 348, 97 (1994).
A. Böhm et al., Nucl. Instrum. Methods Phys. Res. A 443, 238 (2000).
L. Karsch et al., Nucl. Instrum. Methods Phys. Res. A 460, 362 (2001).
L. Karsch, PhD Thesis, Technische Universität Dresden (2005).
Particle Data Group (K. Nakamura et al.), J. Phys. G 37, 075021 (2010).
A. Baldini, Landoldt-Børnstein: Numerical Data and Functional Relationships in Science and Technology, New Series Vol. I/12b (Springer, New York, Heidelberg, 1988). .
S. Brand, PhD Thesis, Ruhr-Universität Bochum (1995).
U. Zielinsky, PhD Thesis, Ruhr-Universität Bochum (1999).
P. Cloth, Programm INC77, Version 1.0, FZ Jülich, 1992.
H.W. Bertini, Phys. Rev. 131, 1821 (1963).
H.W. Bertini, Phys. Rev. 188, 1711 (1969).
M. Abdel-Bary et al., Phys. Lett. B 688, 142 (2010).
D. Albers et al., Phys. Rev. Lett. 78, 1652 (1997).
G. Feldman, R.D. Cousins, Phys. Rev. D 57, 3873 (1998).
The ROOT system homepage, http://root.cern.ch/root/html/TFeldmanCousins.html.
G.Q. Li, C.M. Ko, Nucl. Phys. A 594, 439 (1995).
K. Tsushima et al., Phys. Rev. C 59, 369 (2000).
R. Shyam, Phys. Rev. C 73, 035211 (2006).
Ju-Jun Xie, Bing-Song Zou, Phys. Lett. B 649, 405 (2007).
Cao Xu et al., Chin. Phys. Lett. 25, 888 (2008).
A. Sibirtsev et al., Eur. Phys. J. A 27, 296 (2006).
G. Feldman, P.T. Matthews, Phys. Rev. 109, 546 (1958).
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The COSY-TOF Collaboration., Abdel-Bary, M., Abdel-Samad, S. et al. The pp → nK+Σ+ reaction at 2.95 GeV/c. Eur. Phys. J. A 48, 37 (2012). https://doi.org/10.1140/epja/i2012-12037-2
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DOI: https://doi.org/10.1140/epja/i2012-12037-2