The e(+)-jet invariant mass spectrum produced in the reaction e(+)p --> e(+)X has been studied at a center-of-mass energy of 300 GeV. The data were collected. using the ZEUS detector operating at the HERA collider, and correspond to an integrated luminosity of 47.7 pb(-1). The observed mass spectrum is in good agreement with Standard Model expectations up to an e(+)-jet mass of 210 GeV. Above this mass. some excess is seen. The angular distribution of these events is typical of high-Q(2) neutral current events and does not give convincing evidence for the presence of a narrow scalar or vector state. Limits are presented on the product of cross section and branching ratio for such a slate and are interpreted as limits on leptoquark or R-parity-violating squark production. Specific leptoquark types are ruled out at 95% confidence level for coupling strength lambda = 0.3 for masses between 150 and 280 GeV.

Search for resonances decaying to e(+)-jet in e(+)p interactions at HERA

SACCHI, Roberto;CIRIO, Roberto;COSTA, Marco;MONACO, Vincenzo;PERONI, Cristiana;SOLANO, Ada Maria;
2000-01-01

Abstract

The e(+)-jet invariant mass spectrum produced in the reaction e(+)p --> e(+)X has been studied at a center-of-mass energy of 300 GeV. The data were collected. using the ZEUS detector operating at the HERA collider, and correspond to an integrated luminosity of 47.7 pb(-1). The observed mass spectrum is in good agreement with Standard Model expectations up to an e(+)-jet mass of 210 GeV. Above this mass. some excess is seen. The angular distribution of these events is typical of high-Q(2) neutral current events and does not give convincing evidence for the presence of a narrow scalar or vector state. Limits are presented on the product of cross section and branching ratio for such a slate and are interpreted as limits on leptoquark or R-parity-violating squark production. Specific leptoquark types are ruled out at 95% confidence level for coupling strength lambda = 0.3 for masses between 150 and 280 GeV.
2000
16
253
267
http://dx.doi.org/10.1007/s100520050018
ZEUS; LEPTOQUARK PAIR PRODUCTION; MONTE-CARLO GENERATOR; P(P)OVER-BAR COLLISIONS; HADRON-COLLISIONS; SCATTERING; PHYSICS; MODEL; LEP
J. Breitweg;S. Chekanov;M. Derrick;D. Krakauer;S. Magill;B. Musgrave;A. Pellegrino;J. Repond;R. Stanek;R. Yoshida;M. C. K.;G. Abbiendi;F. Anselmo;P. Antonioli;G. Bari;M. Basile;L. Bellagamba;D. Boscherini;A. Bruni;G. Bruni;G. C. Romeo;G. Castellini;L. Cifarelli;F. Cindolo;A. Contin;N. Coppola;M. Corradi;S. D. Pasquale;P. Giusti;G. Iacobucci;G. Laurenti;G. Levi;A. Margotti;T. Massam;R. Nania;F. Palmonari;A. Pesci;A. Polini;G. Sartorelli;Y. Z. Garcia;A. Zichichi;C. Amelung;A. Bornheim;I. Brock;K. Coboken;J. Crittenden;R. Deffner;K. Hartmann;K. Heinloth;E. Hilger;P. Irrgang;H. P. Jakob;A. Kappes;U. F. Katz;R. Kerger;E. Paul;H. Schnurbusch;A. Stifutkin;J. Tandler;K. C. Voss;A. Weber;H. Wieber;D. S. Bailey;O. Barret;N. H. Brook;B. Foster;G. P. Heath;H. F. Heath;J. D. McFall;D. Piccioni;E. Rodrigues;J. Scott;R. J. Tapper;M. Capua;A. Mastroberardino;M. Schioppa;G. Susinno;H. Y. Jeoung;J. Y. Kim;J. H. Lee;I. T. Lim;K. J. Ma;M. Y. Pac;A. Caldwell;W. Liu;X. Liu;B. Mellado;S. Paganis;R. Sacchi;S. Sampson;F. Sciulli;J. Chwastowski;A. Eskreys;J. Figiel;K. Klimek;K. Olkiewicz;K. Piotrzkowski;M. B. Przybycien;P. Stopa;L. Zawiejski;L. Adamczyk;B. Bednarek;K. Jelen;D. Kisielewska;A. M. Kowal;T. Kowalski;M. Przybycien;E. Rulikowska-Zarebska;L. Suszycki;D. Szuba;A. Kotanski;L. A. T.;U. Behrens;J. K. Bienlein;C. Burgard;K. Desler;G. Drews;A. Fox-Murphy;U. Fricke;F. Goebel;P. Gottlicher;R. Graciani;T. Haas;W. Hain;G. F. Hartner;D. Hasell;K. Hebbel;K. F. Johnson;M. Kasemann;W. Koch;U. Kotz;H. Kowalski;L. Lindemann;B. Lohr;M. Martinez;M. Milite;T. Monteiro;M. Moritz;D. Notz;F. Pelucchi;M. C. Petrucci;M. Rohde;P. R. B.;A. A. Savin;U. Schneekloth;F. Selonke;M. Sievers;S. Stonjek;E. Tassi;G. Wolf;U. Wollmer;C. Youngman;W. Zeuner;C. Coldewey;H. J. Grabosch;A. L. D.;A. Meyer;S. Schlenstedt;P. B. Straub;C. Barbagli;E. Gallo;P. Pelfer;C. Maccarrone;L. Votano;A. Bamberger;A. Benen;S. Eisenhardt;P. Markun;H. Raach;S. Wolfle;P. J. Bussey;A. T. Doyle;S. W. Lee;N. Macdonald;G. J. McCance;D. H. Saxon;L. E. Sinclair;I. O. Skillicorn;R. Waugh;I. Bohnet;N. Gendner;U. Holm;A. Meyer-Larsen;H. Salehi;K. Wick;D. Dannheim;A. Garfagnini;I. Gialas;L. K. Gladilin;D. Kcira;R. Klanner;E. Lohrmann;G. Poelz;F. Zetsche;R. Goncalo;K. R. Long;D. B. Miller;A. D. Tapper;R. Walker;U. Mallik;P. Cloth;D. Filges;T. Ishii;M. Kuze;K. Nagano;K. Tokushuku;S. Yamada;Y. Yamazaki;S. H. Ahn;S. B. Lee;S. K. Park;H. Lim;I. H. Park;D. Son;F. Barreiro;G. Garcia;C. Glasman;O. Gonzalez;L. Labarga;J. d. Peso;I. Redondo;J. Terron;M. Barbi;F. Corriveau;D. S. Hanna;A. Ochs;S. Padhi;M. Riveline;D. G. Stairs;M. Wing;T. Tsurugai;V. Bashkirov;B. A. Dologshein;R. K. Dementiev;P. F. Ermolov;Y. A. Golubkov;I. I. Katkov;L. A. Khein;N. A. Korotkova;I. A. Korzhavina;V. A. Kuzmin;O. Y. Lukina;A. S. Proskuryakov;L. M. Shcheglova;A. N. Solomin;N. N. Vlasov;S. A. Zotkin;C. Bokel;M. Botje;N. Brummer;J. Engelen;S. Grijpink;E. Koffeman;P. Kooijman;S. Schagen;A. v. Sighem;H. Tiecke;N. Tuning;J. J. Velthuis;J. Vossebeld;L. Wiggers;E. d. Wolf;D. Acosta;B. Bylsma;L. S. Durkin;J. Gilmore;C. M. Ginsburg;C. L. Kim;T. Y. Ling;S. Boogert;A. M. Cooper-Sarkar;R. C. E.;J. Grosse-Knetter;T. Matsushita;O. Ruske;M. R. Sutton;R. Walczak;A. Bertolin;R. Brugnera;R. Carlin;F. D. Corso;U. Dosselli;S. Dusini;S. Limentani;M. Morandin;M. Posocco;L. L. Stanco;R. Stroili;C. Voci;L. Iannotti;B. Y. Oh;J. R. Okrasinski;W. S. Toothacker;J. J. Whitmore;Y. Iga;G. D'Agostini;G. Marini;A. Nigro;C. Cormack;J. C. Hart;N. A. McCubbin;T. P. Shah;D. Epperson;C. Heusch;H. F. W.;A. Seiden;R. Wichmann;D. C. Williams;N. Pavel;H. Abramowicz;S. Dagan;S. Kananov;A. Kreisel;A. Levy;T. Abe;T. Fusayasu;K. Umemori;T. Yamashita;R. Hamatsu;T. Hirose;M. Inuzuka;S. Kitamura;T. Nishimura;M. Arneodo;N. Cartiglia;R. Cirio;M. Costa;M. I. Ferrero;S. Maselli;V. Monaco;C. Peroni;M. Ruspa;A. Solano;A. Staiano;M. Dardo;D. C. Bailey;C. P. Fagerstroem;R. Galea;T. Koop;G. M. Levman;J. E. Martin;R. S. Orr;S. Polenz;A. Sabetfakhri;D. Simmons;J. M. Butterworth;C. D. Catterall;M. E. Hayes;E. A. Heaphy;T. W. Jones;J. B. Lane;B. J. West;J. Ciborowski;R. Ciesielski;G. Grzelak;R. J. Nowak;J. M. Pawlak;R. Pawlak;B. Smalska;T. Tymieniecka;A. K. Wroblewski;J. A. Zakrzewski;A. F. Zarnecki;M. Adamus;T. Gadaj;O. Deppe;K. Eisenberg;D. Hochman;U. Karshon;W. F. Badgett;D. Chapin;R. Cross;C. Foudas;S. Mattingly;D. D. Reeder;W. H. Smith;A. Vaiciulis;T. Wildschek;M. Wodarczyk;A. Deshpande;S. Dhawan;V. W. Hughes;S. Bhadra;C. Catterall;J. E. Cole;W. R. Frisken;R. Hall-Wilton;M. Khakzad;S. Menary;W. B. Schmidke
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