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Limits for the central production of Theta+ and Xi(--)pentaquarks in 920-GeV pA collisions |
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| Authors: | 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 Böcker M Bogatyrev A Bohm G Bräuer M Bruinsma M Bruschi M Buchholz P Buran T Carvalho J Conde P Cruse C Dam M Danielsen K M Danilov M Castro S De 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 Gläss J Goloubkov D Golubkov Y Golutvin A Golutvin I |
| Affiliation: | Max-Planck-Institut für Physik, Werner-Heisenberg-Institut, D-80805 Munich, Germany. |
| 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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