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25 April 2024

» pubmed » pmid15600999

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Limits for the central production of Theta+ and Xi(--)pentaquarks in 920-GeV pA collisions
I Abt ; 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 ; ;
Date:	19 Nov 2004
Journal:	Phys Rev Lett, 93 (21), 212003
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(--).
Source:	PubMed, pmid15600999
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