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. 2004 Nov 19;93(21):212003.
doi: 10.1103/PhysRevLett.93.212003. Epub 2004 Nov 18.

Limits for the central production of Theta+ and Xi(--)pentaquarks in 920-GeV pA collisions

I Abt  1 , M Adams, M Agari, H Albrecht, A Aleksandrov, V Amaral, A Amorim, S J Aplin, V Aushev, Y Bagaturia, V Balagura, M Bargiotti, O Barsukova, J Bastos, J Batista, C Bauer, Th S Bauer, A Belkov, Ar Belkov, I Belotelov, A Bertin, B Bobchenko, M Böcker, A Bogatyrev, G Bohm, M Bräuer, M Bruinsma, M Bruschi, P Buchholz, T Buran, J Carvalho, P Conde, C Cruse, M Dam, K M Danielsen, M Danilov, S De Castro, H Deppe, X Dong, H B Dreis, V Egorytchev, K Ehret, F Eisele, D Emeliyanov, S Essenov, L Fabbri, P Faccioli, M Feuerstack-Raible, J Flammer, B Fominykh, M Funcke, Ll Garrido, B Giacobbe, J Gläss, D Goloubkov, Y Golubkov, A Golutvin, I Golutvin, I Gorbounov, A Gorisek, O Gouchtchine, D C Goulart, S Gradl, W Gradl, F Grimaldi, J Groth-Jensen, Yu Guilitsky, J D Hansen, J M Hernández, W Hofmann, T Hott, W Hulsbergen, U Husemann, O Igonkina, M Ispiryan, T Jagla, C Jiang, H Kapitza, S Karabekyan, N Karpenko, S Keller, J Kessler, F Khasanov, Yu Kiryushin, E Klinkby, K T Knöpfle, H Kolanoski, S Korpar, C Krauss, P Kreuzer, P Krizan, D Krücker, S Kupper, T Kvaratskheliia, A Lanyov, K Lau, B Lewendel, T Lohse, B Lomonosov, R Männer, S Masciocchi, I Massa, I Matchikhilian, G Medin, M Medinnis, M Mevius, A Michetti, Yu Mikhailov, R Mizuk, R Muresan, M Zur Nedden, M Negodaev, M Nörenberg, S Nowak, M T Núñez Pardo de Vera, M Ouchrif, F Ould-Saada, C Padilla, D Peralta, R Pernack, R Pestotnik, M Piccinini, M A Pleier, M Poli, V Popov, A Pose, D Pose, S Prystupa, V Pugatch, Y Pylypchenko, J Pyrlik, K Reeves, D Ressing, H Rick, I Riu, P Robmann, I Rostovtseva, V Rybnikov, F Sánchez, A Sbrizzi, M Schmelling, B Schmidt, A Schreiner, H Schröder, A J Schwartz, A S Schwarz, B Schwenninger, B Schwingenheuer, F Sciacca, N Semprini-Cesari, S Shuvalov, L Silva, K Smirnov, L Sözüer, S Solunin, A Somov, S Somov, J Spengler, R Spighi, A Spiridonov, A Stanovnik, M Staric, C Stegmann, H S Subramania, M Symalla, I Tikhomirov, M Titov, I Tsakov, U Uwer, C van Eldik, Yu Vassiliev, M Villa, A Vitale, I Vukotic, H Wahlberg, A H Walenta, M Walter, J J Wang, D Wegener, U Werthenbach, H Wolters, R Wurth, A Wurz, Yu Zaitsev, M Zavertyaev, G Zech, T Zeuner, A Zhelezov, Z Zheng, R Zimmermann, T Zivko, A Zoccoli; HERA-B Collaboration
Affiliations

Limits for the central production of Theta+ and Xi(--)pentaquarks in 920-GeV pA collisions

I Abt et al. Phys Rev Lett. .

Abstract

We have searched for Theta+(1540) and Xi(--)(1862) pentaquark candidates in proton-induced reactions on C, Ti, and W targets at midrapidity and square root of s = 41.6 GeV. In 2 x 10(8) inelastic events we find no evidence for narrow (sigma approximately 5 MeV) signals in the Theta+ --> pK0(S) and Xi(--) --> Xi- pi- channels; our 95% C.L. upper limits (UL) for the inclusive production cross section times branching fraction B dsigma/dy/(y approximately 0) are (4-16) mub/N for a Theta+ mass between 1521 and 1555 MeV, and 2.5 mub/N for the Xi(--). The UL of the yield ratio of Theta+/Lambda(1520) < (3-12)% is significantly lower than model predictions. Our UL of B Xi(--)/Xi(1530)0 < 4% is at variance with the results that have provided the first evidence for the Xi(--).

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