Search for the exotic Θ + resonance in the NOMAD experiment

O. Samoylov,D. Naumov,V. Cavasinni,P. Astier, D. Autiero, A. Baldisseri, M. Baldo-Ceolin,M. Banner,G. Bassompierre,K. Benslama,N. Besson,I. Bird, B. Blumenfeld, F. Bobisut,J. Bouchez,S. Boyd,A. Bueno, S. Bunyatov,L. Camilleri, A. Cardini,P.W. Cattaneo,A. Cervera-Villanueva,R. Challis,A. Chukanov,G. Collazuol, G. Conforto,C. Conta,M. Contalbrigo,R. Cousins,D. Daniels,H. Degaudenzi,T. Del Prete,A. De Santo,T. Dignan,L. Di Lella,E. do Couto e Silva,J. Dumarchez,M. Ellis,G.J. Feldman,R. Ferrari,D. Ferrère, V. Flaminio, M. Fraternali,J.-M. Gaillard, E. Gangler, A. Geiser, D. Geppert, D. Gibin,S. Gninenko,A. Godley,J.-J. Gomez-Cadenas,J. Gosset,C. Gößling,M. Gouanère,A. Grant,G. Graziani,A. Guglielmi,C. Hagner,J. Hernando,D. Hubbard,P. Hurst,N. Hyett,E. Iacopini,C. Joseph,F. Juget,N. Kent, M. Kirsanov,O. Klimov, J. Kokkonen,A. Kovzelev,A. Krasnoperov,S. Lacaprara,C. Lachaud,B. Lakić,A. Lanza,L. La Rotonda,M. Laveder,A. Letessier-Selvon,J.-M. Levy,L. Linssen,A. Ljubičić,J. Long,A. Lupi,V. Lyubushkin,A. Marchionni,F. Martelli, X. Méchain,J.-P. Mendiburu,J.-P. Meyer,M. Mezzetto,S.R. Mishra,G.F. Moorhead,P. Nédélec, Y. Nefedov, C. Nguyen-Mau, D. Orestano,F. Pastore,L.S. Peak, E. Pennacchio, H. Pessard, R. Petti, A. Placci, G. Polesello, D. Pollmann, A. Polyarush, C. Poulsen, B. Popov, L. Rebuffi,J. Rico, P. Riemann,C. Roda, A. Rubbia,F. Salvatore, K. Schahmaneche, B. Schmidt, T. Schmidt, A. Sconza, M. Sevior, D. Sillou, F.J.P. Soler, G. Sozzi, D. Steele, U. Stiegler, M. Stipčević,Th. Stolarczyk, M. Tareb-Reyes, G.N. Taylor, V. Tereshchenko, A. Toropin, A.-M. Touchard,S.N. Tovey, M.-T. Tran, E. Tsesmelis, J. Ulrichs, L. Vacavant, M. Valdata-Nappi, V. Valuev, F. Vannucci,K.E. Varvell, M. Veltri, V. Vercesi, G. Vidal-Sitjes,J.-M. Vieira, T. Vinogradova,F.V. Weber, T. Weisse,F.F. Wilson, L.J. Winton,B.D. Yabsley, H. Zaccone, K. Zuber, P. Zuccon

EUROPEAN PHYSICAL JOURNAL C(2006)

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摘要
A search for exotic Θ + baryon via Θ + →p+K 0 S decay mode in the NOMAD ν μ N data is reported. The special background generation procedure was developed. The proton identification criteria are tuned to maximize the sensitivity to the Θ + signal as a function of x F which allows to study the Θ + production mechanism. We do not observe any evidence for the Θ + state in the NOMAD data. We provide an upper limit on Θ + production rate at 90% CL as 2.13×10 -3 per neutrino interaction.
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