Comparison of spike production in pp and + p / K + p interactions at 205 - 360 GeV / c EHS / NA

EHS/NA22 Collaboration N.M. Agababyan7 , A.Kh. Argynova8 , M.R. Atayan7, M. Charlet4;a, J. Czyżewski4;b;c, E.A. De Wolf1;d, I.M. Dremin9;e, K. Dziunikowska2;c, A.M.F. Endler5, P.F. Ermolov3, Z.Sh. Garutchava6;d , H.R. Gulkanyan7 , R.Sh. Hakobyan7, J.K. Karamyan7, D. Kisielewska2;c, W. Kittel4, A.I. Lebedev8 , A.A. Loctionov8, S.S. Mehrabyan7, Z.V. Metreveli6, M.T.Nazirov8, K. Olkiewicz2;c, F.K. Rizatdinova3, E.K. Shabalina3 , L.N. Smirnova3, M.D. Tabidze6, L.A. Tikhonova3 , A.G. Tomaradze6;f , F. Verbeure1 , S.A. Zotkin3 1 Department of Physics, Universitaire Instelling Antwerpen, B-2610 Wilrijk, Belgium 2 Institute of Physics and Nuclear Techniques of Academy of Mining and Metallurgy and Institute of Nuclear Physics, PL-30055 Krakow, Poland 3 Nuclear Physics Institute, Moscow State University, RU-119899 Moscow, Russia 4 High Energy Physics Institute Nijmegen (HEFIN), University of Nijmegen/NIKHEF, NL-6525 ED Nijmegen, The Netherlands 5 Centro Brasileiro de Pesquisas Fisicas, BR-22290 Rio de Janeiro, Brazil 6 Institute for High Energy Physics of Tbilisi State University, GE-380086 Tbilisi, Georgia 7 Institute of Physics, AM-375036 Yerevan, Armenia 8 Institute of High Energy Physics, Academy of Science of Kazakhstan, Alma-Ata 480082, Kazakhstan 9 Lebedev Physical Institute, Moscow RU-117924, Russia Abstract. It is shown that experimental data on spike production differ in pp and +p/K+p interactions at 205 360 GeV/c. The rapidity distribution of spike centres exhibits two peaks in pp, while it has one wide bump in p/Kp. The peaks are explained as coherent radiation of gluons at finite length. Due to interference phenomena, they are present in pp and practically absent in p/Kp.