Evidence for a narrow baryonic state decaying to K(S)(0)p and K(S)(0)(p)over-bar in deep inelastic scattering at HERA
Articolo
Data di Pubblicazione:
2004
Abstract:
A resonance search has been made in the K(S)(0)p and K(S)(0)(p) over bar invariant-mass spectrum measured with the ZEUS detector at HERA using an integrated luminosity of 121 pb(-1). The search was performed in the central rapidity region of inclusive deep inelastic scattering at an ep centre-of-mass energy of 300-318 GeV for exchanged photon virtuality, Q(2), above 1 GeV(2). Recent results from fixed-target experiments give evidence for a narrow baryon resonance decaying to K(+)n and K(S)(0)p, interpreted as a pentaquark. The results presented here support the existence of such state, with a mass of 1521.5 +/- 1.5(stat.)(-1.7)(+2.8)(syst.) MeV and a Gaussian width consistent with the experimental resolution of 2 MeV The signal is visible at high Q(2) and, for Q(2) > 20 GeV(2), contains 221 +/- 48 events. The probability of a similar signal anywhere in the range 1500-1560 MeV arising from fluctuations of the background is below 6 x 10(-5).
Tipologia CRIS:
03A-Articolo su Rivista
Keywords:
CENTRAL TRACKING DETECTOR; ZEUS BARREL CALORIMETER; POSITIVE-STRANGENESS; REAR CALORIMETER; PHOTOPRODUCTION; CONSTRUCTION; DESIGN; PENTAQUARK; ENERGY; MASS
Elenco autori:
S. Chekanov;M. Derrick;J. H. Loizides;S. Magill;S. Miglioranzi;B. Musgrave;J. Repond;R. Yoshida;M. C. K.;N. Pavel;P. Antonioli;G. Bari;M. Basile;L. Bellagamba;D. Boscherini;A. Bruni;G. Bruni;G. C. Romeo;L. Cifarelli;F. Cindolo;A. Contin;M. Corradi;S. D. Pasquale;P. Giusti;G. Iacobucci;A. Margotti;A. Montanari;R. Nania;F. Palmonari;A. Pesci;L. Rinaldi;G. Sartorelli;A. Zichichi;G. Aghuzumtsyan;D. Bartsch;I. Brock;S. Goers;H. Hartmann;E. Hilger;P. Irrgang;H. P. Jakob;O. Kind;U. Meyer;E. Paul;J. Rautenberg;R. Renner;A. Stifutkin;J. Tandler;K. C. Voss;M. Wang;D. S. Bailey;N. H. Brook;J. E. Cole;G. P. Heath;T. Namsoo;S. Robins;M. Wing;M. Capua;A. Mastroberardino;M. Schioppa;G. Susinno;J. Y. Kim;I. T. Lim;K. J. Ma;M. Y. Pac;M. Helbich;Y. Ning;Z. Ren;W. B. Schmidke;F. Sciulli;J. Chwastowski;A. Eskreys;J. Figiel;A. Galas;K. Olkiewicz;P. Stopa;L. Zawiejski;L. Adamczyk;T. Bold;I. Grabowska-Bold;D. Kisielewska;A. M. Kowal;M. Kowal;J. Lukasik;M. Przybycien;L. Suszycki;D. Szuba;J. Szuba;A. Kotanski;W. Slominski;V. Adler;U. Behrens;I. Bloch;K. Borras;V. Chiochia;D. Dannheim;G. Drews;J. Fourletova;U. Fricke;A. Geiser;P. Gottlicher;O. Gutsche;T. Haas;W. Hain;S. Hillert;C. Horn;B. Kahle;U. Kotz;H. Kowalski;G. Kramberger;H. Labes;D. Lelas;H. Lim;B. Lohr;R. Mankel;I. A. Melzer-Pellmann;C. N. Nguyen;D. Notz;A. E. Nuncio-Quiroz;A. Polini;A. Raval;L. Rurua;U. Schneekloth;U. Stosslein;G. Wolf;C. Youngman;W. Zeuner;S. Schlenstedt;G. Barbagli;E. Gallo;C. Genta;R. Pelfer;A. Bamberger;A. Benen;F. Karstens;D. Dobur;N. N. Vlasov;M. Bell;P. J. Bussey;A. T. Doyle;J. Ferrando;J. Hamilton;S. Hanlon;D. H. Saxon;I. O. Skillicorn;I. Gialas;T. Carli;T. Gosau;U. Holm;N. Krumnack;E. Lohrmann;M. Milite;H. Salehi;P. Schleper;T. Schorner-Sadenius;S. Stonjek;K. Wichmann;K. Wick;A. Ziegler;A. Ziegler;C. Collins-Tooth;C. Foudas;R. Goncalo;K. R. Long;A. D. Tapper;P. Cloth;D. Filges;M. Kataoka;K. Nagano;K. Tokushuku;S. Yamada;Y. Yamazaki;A. N. Barakbaev;E. G. Boos;N. S. Pokrovskiy;B. O. Zhautykov;D. Son;K. Piotrzkowski;F. Barreiro;C. Glasman;O. Gonzalez;L. Labarga;J. d. Peso;E. Tassi;J. Terron;M. Zambrana;M. Barbi;F. Corriveau;S. Gliga;J. Lainesse;S. Padhi;D. G. Stairs;R. Walsh;T. Tsurugai;A. Antonov;P. Danilov;B. A. Dolgoshein;D. Gladkov;V. Sosnovtsev;S. Suchkov;R. K. Dementiev;P. F. Ermolov;I. I. Katkov;L. A. Khein;I. A. Korzhavina;V. A. Kuzmin;B. B. Levchenko;O. Y. Lukina;A. S. Proskuryakov;L. M. Shcheglova;S. A. Zotkin;I. Abt;C. Buttner;A. Caldwell;X. Liu;J. Sutiak;N. Coppola;S. Grijpink;E. Koffeman;P. Kooijman;E. Maddox;A. Pellegrino;S. Schagen;H. Tiecke;M. Vazquez;L. Wiggers;E. d. Wolf;N. Brummer;B. Bylsma;L. S. Durkin;T. Y. Ling;A. M. Cooper-Sarkar;A. Cottrell;R. C. E.;B. Foster;G. Grzelak;C. Gwenlan;T. Kohno;S. Patel;P. B. Straub;R. Walczak;A. Bertolin;R. Brugnera;R. Carlin;F. D. Corso;S. Dusini;A. Garfagnini;S. Limentani;A. Longhin;A. Parenti;M. Posocco;L. Stanco;M. Turcato;E. A. Heaphy;E. Metlica;B. Y. Oh;J. J. Whitmore;Y. Iga;G. D'Agostini;G. Marini;A. Nigro;C. Cormack;J. C. Hart;N. A. McCubbin;C. Heusch;I. H. Park;H. Abramowicz;A. Gabareen;S. Kananov;A. Kreisel;A. Levy;M. Kuze;T. Fusayasu;S. Kagawa;T. Tawara;T. Yamashita;R. Hamatsu;T. Hirose;M. Inuzuka;H. Kaji;S. Kitamura;K. Matsuzawa;M. Costa;M. I. Ferrero;V. Monaco;R. Sacchi;A. Solano;M. Arneodo;M. Ruspa;T. Koop;J. F. Martin;A. Mirea;J. M. Butterworth;R. Hall-Wilton;T. W. Jones;M. S. Lightwood;M. R. Sutton;C. Targett-Adams;J. Ciborowski;R. Ciesielski;P. Luzniak;R. J. Nowak;J. M. Pawlak;J. Sztuk;T. Tymieniecka;A. Ukleja;J. Ukleja;A. F. Zarnecki;M. Adamus;P. Plucinski;Y. Eisenberg;D. Hochman;U. Karshon;M. Riveline;A. Everett;L. K. Gladilin;D. Kcira;S. Lammers;L. Li;D. D. Reeder;M. Rosin;P. Ryan;A. A. Savin;W. H. Smith;S. Dhawan;S. Bhadra;C. D. Catterall;S. Fourletov;G. Hartner;S. Menary;M. Soares;J. Standage
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