Limits for the central production of Theta+ and Xi(--)pentaquarks in 920-GeV pA collisions.
Limits for the central production of Theta+ and Xi(--)pentaquarks in 920-GeV pA collisions.
复制标题
920-GeV pA 碰撞中 Theta 和 Xi(--) 五夸克中心产生的限制。
DOI：
10.1103/physrevlett.93.212003
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发表时间：
2004
影响因子：
8.6
通讯作者：
A. Zoccoli
中科院分区：
文献类型：
--
作者：
I. Abt;M. Adams;M. Agari;H. Albrecht;A. Aleksandrov;V. Amaral;A. Amorim;S. Aplin;V. Aushev;Y. Bagaturia;V. Balagura;M. Bargiotti;O. Barsukova;J. Bastos;J. Batista;C. Bauer;T. Bauer;A. Belkov;A. 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. Castro;H. Deppe;X. Dong;H. Dreis;V. Egorytchev;K. Ehret;F. Eisele;D. Emeliyanov;S. Essenov;L. Fabbri;P. Faccioli;M. Feuerstack;J. Flammer;B. Fominykh;M. Funcke;Ll. Garrido;B. Giacobbe;J. Gläß;D. Goloubkov;Y. Golubkov;A. Golutvin;I. Golutvin;I. Gorbounov;A. Gorišek;O. Gouchtchine;D. Goulart;S. Gradl;W. Gradl;F. Grimaldi;J. Groth;Y. Guilitsky;J. Hansen;J. M. Hernandez;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;Y. Kiryushin;E. Klinkby;K. Knöpfle;H. Kolanoski;S. Korpar;C. Krauss;P. Kreuzer;P. Križan;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;Y. Mikhailov;R. Mizuk;R. Mureşan;M. zur Nedden;M. Negodaev;M. Nörenberg;S. Nowak;M. T. Núñez Pardo de Vera;M. Ouchrif;F. Ould;C. Padilla;D. Peralta;R. Pernack;R. Pestotnik;M. Piccinini;M. 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. Schwartz;A. Schwarz;B. Schwenninger;B. Schwingenheuer;F. Sciacca;N. Semprini;S. Shuvalov;L. Silva;K. Smirnov;L. Sözüer;S. Solunin;A. Somov;S. Somov;J. Spengler;R. Spighi;A. Spiridonov;A. Stanovnik;M. Starič;C. Stegmann;H. S. Subramania;M. Symalla;I. Tikhomirov;M. Titov;I. Tsakov;U. Uwer;C. van Eldik;Y. Vassiliev;M. Villa;A. Vitale;I. Vukotic;H. Wahlberg;A. Walenta;M. Walter;J. Wang;D. Wegener;U. Werthenbach;H. Wolters;R. Wurth;A. Wurz;Y. Zaitsev;M. Zavertyaev;G. Zech;T. Zeuner;A. Zhelezov;Z. Zheng;R. Zimmermann;T. Živko;A. Zoccoli
我们在S=41.6GeV的中快度和平方根的C，Ti，W靶上的质子诱导反应中寻找了Theta+(154GeV)和Xi(-)(1862年)五夸克候选者。在2×10(8)非弹性事件中，我们没有发现在Theta+->；pk0(S)和xi(--)-gt；xi-pi-通道中有窄(sigma约5 MeV)信号的证据；我们的95%C.L.上限(UL)对于Theta+质量在1521到1555 MeV之间的分支分数B dsigma/dy/(y约0)是(4-16)Mub/N，对于Xi(-)是2.5Mub/N。Theta+/Lambda(1520)&(3-12)%收益率的UL显著低于模型预测。我们对BXi(--)/Xi(1530)0<；4%的UL与为Xi(--)提供的第一个证据的结果不一致。
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(--).