1. Limits for the central production of $\Theta^+$ and $\Xi^{--}$ pentaquarks in 920-$GeV$ $pA$ collisions
- Author
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Abt, I., Adams, M., Agari, M., Albrecht, H., Aleksandrov, A., Amaral, V., Amorim, A., Aplin, S. J., Aushev, V., Bagaturia, Y., Balagura, V., Bargiotti, M., Barsukova, O., Bastos, J., Batista, J., Bauer, C., Bauer, Th. S., Belkov, A., Belkov, Ar., Belotelov, I., Bertin, A., Bobchenko, B., Bocker, M., Bogatyrev, A., Bohm, G., Brauer, M., Bruinsma, M., Bruschi, M., Buchholz, P., Buran, T., Carvalho, J., Conde, P., Cruse, C., Dam, M., Danielsen, K. M., Danilov, M., De Castro, S., Deppe, H., Dong, X., Dreis, H. B., Egorytchev, V., Ehret, K., Eisele, F., Emeliyanov, D., Essenov, S., Fabbri, L., Faccioli, P., Feuerstack-Raible, M., Flammer, J., Fominykh, B., Funcke, M., Garrido, Ll., Giacobbe, B., Glass, J., Goloubkov, D., Golubkov, Y., Golutvin, A., Golutvin, I., Gorbounov, I., Gorisek, A., Gouchtchine, O., Goulart, D. C., Gradl, S., Gradl, W., Grimaldi, F., Guilitsky, Yu., Hansen, J. D., Hernandez, J. M., Hofmann, W., Hott, T., Hulsbergen, W., Husemann, U., Igonkina, O., Ispiryan, M., Jagla, T., Jiang, C., Kapitza, H., Karabekyan, S., Karpenko, N., Keller, S., Kessler, J., Khasanov, F., Kiryushin, Yu., Knopfle, K. T., Kolanoski, H., Korpar, S., Krauss, C., Kreuzer, P., Krizan, P., Krucker, D., Kupper, S., Kvaratskheliia, T., Lanyov, A., Lau, K., Lewendel, B., Lohse, T., Lomonosov, B., Manner, R., Masciocchi, S., Massa, I., Matchikhilian, I., Medin, G., Medinnis, M., Mevius, M., Michetti, A., Mikhailov, Yu., Mizuk, R., Muresan, R., Zur Nedden, M., Negodaev, M., Norenberg, M., Nowak, S., Nunez Pardo De Vera, M. T., Ouchrif, M., Ould-Saada, F., Padilla, C., Peralta, D., Pernack, R., Pestotnik, R., Piccinini, M., Pleier, Marc-Andre, Poli, M., Popov, V., Pose, A., Pose, D., Prystupa, S., Pugatch, V. M., Pylypchenko, Y., Pyrlik, J., Reeves, K., Ressing, D., Rick, H., Riu, I., Robmann, P., Rostovtseva, I., Rybnikov, V., Sanchez, F., Sbrizzi, A., Schmelling, M., Schmidt, B., Schreiner, A., Schroder, H., Schwartz, Alan J., Schwarz, Andreas S., Schwenninger, B., Schwingenheuer, B., Sciacca, F., Semprini-Cesari, N., Shuvalov, S., Silva, L., Smirnov, K., Sozuer, L., Solunin, S., Somov, A., Somov, S., Spengler, J., Spighi, R., Spiridonov, A., Stanovnik, A., Staric, M., Stegmann, C., Subramania, H. S., Symalla, M., Tikhomirov, I., Titov, Maxim P., Tsakov, I., Uwer, U., Van Eldik, C., Vassiliev, Yu., Villa, M., Vitale, A., Vukotic, I., Wahlberg, H., Walenta, A. H., Walter, M., Wang, J. J., Wegener, D., Werthenbach, U., Wolters, H., Wurth, R., Wurz, A., Zaitsev, Yu., Zavertyaev, M., Zech, Gunter, Zeuner, T., Zhelezov, A., Zheng, Z., Zimmermann, R., Zivko, T., and Zoccoli, A.
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tungsten ,mass spectrum: (p K0(S)) ,mass spectrum: (Xi- pi-) ,carbon ,HERA-B ,p nucleus: inclusive reaction ,yield: (Theta(1540) Lambda(1520)) ,DESY HERA Stor ,channel cross section: branching ratio ,yield: (Xi(1862) Xi(1530)) ,postulated particle: Xi(1862) ,titanium ,pentaquark: search for ,upper limit ,920 GeV ,Theta(1540) ,experimental results - Abstract
Physical review letters 93(21), 212003 (2004). doi:10.1103/PhysRevLett.93.212003, We have searched for Theta^+(1540) and Xi^{--}(1862) pentaquark candidates in proton-induced reactions on C, Ti and W targets at mid-rapidity and \sqrt{s} = 41.6 GeV. In 2x10^8 inelastic events we find no evidence for narrow (sigma~5 MeV) signals in the Theta^+ -> pK_s and Xi^{--} -> Xi^-pi^- channels: our 95% CL upper limits (UL) for the inclusive production cross section times branching fraction Bx(dsigma/dy)|_{y~0} are 3.7 and 2.5 microb/N. The UL of the yield ratio of [Theta^+ / Lambda(1520)] < 2.7% is significantly lower than model predictions. Our UL of [BxXi^{--} / Xi(1530)^0] < 4% is at variance with the results that have provided first evidence for the Xi^{--} signal., Published by APS, College Park, Md.
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- 2004
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