Evidence for antikaon mass modification in proton-nucleus collisions
Yu T Kiselev; the FHS Collaboration; A V Akindinov; L Yu Brovkin; A N Martemyanov; V I Mikhailichenko; Yu T Kiselev; Yu V Terekhov; Yu T Kiselev; Institute for Theoretical and Experimental Physics, 117259 Moscow, B Cheremushkinskaya 25, Russia; the FHS Collaboration; Institute for Theoretical and Experimental Physics, 117259 Moscow, B Cheremushkinskaya 25, Russia; A V Akindinov; Institute for Theoretical and Experimental Physics, 117259 Moscow, B Cheremushkinskaya 25, Russia; L Yu Brovkin; Institute for Theoretical and Experimental Physics, 117259 Moscow, B Cheremushkinskaya 25, Russia; A N Martemyanov; Institute for Theoretical and Experimental Physics, 117259 Moscow, B Cheremushkinskaya 25, Russia; V I Mikhailichenko; Institute for Theoretical and Experimental Physics, 117259 Moscow, B Cheremushkinskaya 25, Russia; Yu T Kiselev; Institute for Theoretical and Experimental Physics, 117259 Moscow, B Cheremushkinskaya 25, Russia; Yu V Terekhov; Institute for Theoretical and Experimental Physics, 117259 Moscow, B Cheremushkinskaya 25, Russia
Журнал:
Journal of Physics G: Nuclear and Particle Physics
Дата:
1999-02-01
Аннотация:
Yields of K<sup>+</sup> and K<sup>−</sup> mesons from proton-nucleus collisions at the subthreshold energy range were measured. Kaons produced at 10.5° with momentum 1.28 GeV/c were detected by a beam-line focusing hadron spectrometer (FHS). The parameters of the Folding model were fixed by the best fit to the K<sup>+</sup> data. Calculation with normal antikaon mass underestimates the experimental cross section of K<sup>−</sup> production by a factor of 2.5. In-medium antikaon mass was found to be 0.6-0.85 of its vacuum mass depending on the parametrization of the total cross section for K<sup>−</sup> production in pN collisions.
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