Article

Search for contact interactions, large extra dimensions and finite quark radius in ep collisions at HERA

Argonne National Laboratory, Argonne, IL 60439-4815, USA4545Supported by the US Department of Energy.; M.C.K. Mattingly; Andrews University, Berrien Springs, MI 49104-0380, USA; P. Antonioli,; G. Bari,; M. Basile,; L. Bellagamba,; D. Boscherini,; A. Bruni,; G. Bruni,; G. Cara Romeo,; L. Cifarelli,; F. Cindolo,; A. Contin,; M. Corradi,; S. De Pasquale,; P. Giusti,; G. Iacobucci,; A. Margotti,; A. Montanari,; R. Nania,; F. Palmonari,; A. Pesci,; G. Sartorelli,; A. Zichichi; University and INFN Bologna, Bologna, Italy3636Supported by the Italian National Institute for Nuclear Physics (INFN).; G. Aghuzumtsyan,; D. Bartsch,; I. Brock,; S. Goers,; H. Hartmann,; E. Hilger,; P. Irrgang,; H.-P. Jakob,; O. Kind,; U. Meyer,; J. Rautenberg,; R. Renner,; A. Stifutkin,; J. Tandler,; K.C. Voss,; M. Wang,; Physikalisches Institut der Universität Bonn, Bonn, Germany3333Supported by the German Federal Ministry for Education and Research (BMBF), under contract numbers HZ1GUA 2, HZ1GUB 0, HZ1PDA 5, HZ1VFA 5.; N.H. Brook,; J.E. Cole,; G.P. Heath,; T. Namsoo,; S. Robins,; M. Wing; H.H. Wills Physics Laboratory, University of Bristol, Bristol, United Kingdom4444Supported by the Particle Physics and Astronomy Research Council, UK.; M. Capua,; A. Mastroberardino,; M. Schioppa,; G. Susinno; Physics Department, Calabria University, and INFN, Cosenza, Italy36; J.Y. Kim,; Y.K. Kim,; J.H. Lee,; I.T. Lim,; Chonnam National University, Kwangju, South Korea3838Supported by the Korean Ministry of Education and Korea Science and Engineering Foundation.; M. Helbich,; X. Liu,; B. Mellado,; Y. Ning,; S. Paganis,; Z. Ren,; W.B. Schmidke,; F. Sciulli; Nevis Laboratories, Columbia University, Irvington on Hudson, NY 10027, USA4646Supported by the US National Science Foundation.; J. Chwastowski,; A. Eskreys,; J. Figiel,; A. Galas,; K. Olkiewicz,; P. Stopa,; L. Zawiejski; Institute of Nuclear Physics, Cracow, Poland4343Supported by the Spanish Ministry of Education and Science through funds provided by CICYT.; L. Adamczyk,; T. Bołd,; D. Kisielewska,; A.M. Kowal,; M. Kowal,; T. Kowalski,; M. Przybycień,; L. Suszycki,; D. Szuba,; Faculty of Physics and Nuclear Techniques, AGH-University of Science and Technology, Cracow, Poland4747Supported by the Polish State Committee for Scientific Research, Grant No. 112/E-356/SPUB/DESY/P-03/DZ 116/2003-2005, 2 P03B 13922.; W. Słomiński; Department of Physics, Jagellonian University, Cracow, Poland; V. Adler,; U. Behrens,; I. Bloch,; K. Borras,; V. Chiochia,; D. Dannheim,; G. Drews,; J. Fourletova,; U. Fricke,; A. Geiser,; O. Gutsche,; T. Haas,; W. Hain,; B. Kahle,; U. Kötz,; G. Kramberger,; H. Labes,; D. Lelas,; H. Lim,; B. Löhr,; R. Mankel,; I.-A. Melzer-Pellmann,; C.N. Nguyen,; D. Notz,; A.E. Nuncio-Quiroz,; A. Polini,; A. Raval,; L. Rurua,; U. Schneekloth,; U. Stösslein,; G. Wolf,; C. Youngman,; W. Zeuner; Deutsches Elektronen-Synchrotron DESY, Hamburg, Germany; S. Schlenstedt; DESY Zeuthen, Zeuthen, Germany; G. Barbagli,; E. Gallo,; C. Genta,; P.G. Pelfer; University and INFN, Florence, Italy36; A. Bamberger,; A. Benen,; F. Karstens,; D. Dobur,; N.N. Vlasov; Fakultät für Physik der Universität Freiburg i.Br., Freiburg i.Br., Germany33; M. Bell,; P.J. Bussey,; A.T. Doyle,; J. Ferrando,; J. Hamilton,; S. Hanlon,; D.H. Saxon,; I.O. Skillicorn; Department of Physics and Astronomy, University of Glasgow, Glasgow, United Kingdom44; I. Gialas; Department of Engineering in Management and Finance, University of Aegean, Greece; T. Carli,; T. Gosau,; U. Holm,; N. Krumnack,; E. Lohrmann,; M. Milite,; H. Salehi,; P. Schleper,; K. Wichmann,; K. Wick,; A. Ziegler,; Ar. Ziegler; Institute of Experimental Physics, Hamburg University, Hamburg, Germany33; C. Collins-Tooth,; C. Foudas,; K.R. Long,; A.D. Tapper; High Energy Nuclear Physics Group, Imperial College London, London, United Kingdom44; P. Cloth,; D. Filges; Forschungszentrum Jülich, Institut für Kernphysik, Jülich, Germany; K. Nagano,; S. Yamada,; Y. Yamazaki; Institute of Particle and Nuclear Studies, KEK, Tsukuba, Japan3737Supported by the Japanese Ministry of Education, Culture, Sports, Science and Technology (MEXT) and its grants for Scientific Research.; A.N. Barakbaev,; E.G. Boos,; N.S. Pokrovskiy,; B.O. Zhautykov; Institute of Physics and Technology of Ministry of Education and Science of Kazakhstan, Almaty, Kazakhstan; D. Son; Center for High Energy Physics, Kyungpook National University, Daegu, South Korea38; K. Piotrzkowski; Institut de Physique Nucléaire, Université Catholique de Louvain, Louvain-la-Neuve, Belgium; F. Barreiro,; O. González,; L. Labarga,; J. del Peso,; E. Tassi,; J. Terrón,; M. Vázquez,; M. Zambrana; Departamento de Física Teórica, Universidad Autónoma de Madrid, Madrid, Spain43; M. Barbi,; F. Corriveau,; S. Gliga,; J. Lainesse,; S. Padhi,; D.G. Stairs,; R. Walsh; Department of Physics, McGill University, Montréal, Québec, Canada H3A 2T83232Supported by the Natural Sciences and Engineering Research Council of Canada (NSERC).; T. Tsurugai; Faculty of General Education, Meiji Gakuin University, Yokohama, Japan37; A. Antonov,; P. Danilov,; B.A. Dolgoshein,; D. Gladkov,; V. Sosnovtsev,; S. Suchkov; Moscow Engineering Physics Institute, Moscow, Russia4141Partially supported by the German Federal Ministry for Education and Research (BMBF).; R.K. Dementiev,; P.F. Ermolov,; I.I. Katkov,; L.A. Khein,; I.A. Korzhavina,; V.A. Kuzmin,; O.Yu. Lukina,; A.S. Proskuryakov,; L.M. Shcheglova,; S.A. Zotkin; Institute of Nuclear Physics, Moscow State University, Moscow, Russia4242Partly supported by the Russian Ministry of Industry, Science and Technology through its grant for Scientific Research on High Energy Physics.; N. Coppola,; S. Grijpink,; E. Koffeman,; P. Kooijman,; E. Maddox,; A. Pellegrino,; S. Schagen,; H. Tiecke,; J.J. Velthuis,; L. Wiggers,; E. de Wolf; NIKHEF and University of Amsterdam, Amsterdam, Netherlands3939Supported by the Netherlands Foundation for Research on Matter (FOM).; N. Brümmer,; B. Bylsma,; L.S. Durkin,; T.Y. Ling; Physics Department, Ohio State University, Columbus, OH 43210, USA45; A.M. Cooper-Sarkar,; A. Cottrell,; R.C.E. Devenish,; B. Foster,; G. Grzelak,; S. Patel,; P.B. Straub,; R. Walczak; Department of Physics, University of Oxford, Oxford, United Kingdom44; A. Bertolin,; R. Brugnera,; R. Carlin,; F. Dal Corso,; S. Dusini,; A. Garfagnini,; S. Limentani,; A. Longhin,; A. Parenti,; M. Posocco,; L. Stanco,; M. Turcato; Dipartimento di Fisica dell'Università and INFN, Padova, Italy36; E.A. Heaphy,; F. Metlica,; B.Y. Oh,; Department of Physics, Pennsylvania State University, University Park, PA 16802, USA46; Y. Iga; Polytechnic University, Sagamihara, Japan37; G. D'Agostini,; G. Marini,; A. Nigro; Dipartimento di Fisica, Università ‘La Sapienza’ and INFN, Rome, Italy36; J.C. Hart,; N.A. McCubbin; Rutherford Appleton Laboratory, Chilton, Didcot, Oxon, United Kingdom44; C. Heusch; University of California, Santa Cruz, CA 95064, USA45; I.H. Park; Department of Physics, Ewha Womans University, Seoul, South Korea; N. Pavel; Fachbereich Physik der Universität-Gesamthochschule Siegen, Germany; H. Abramowicz,; A. Gabareen,; S. Kananov,; A. Kreisel,; A. Levy; Raymond and Beverly Sackler Faculty of Exact Sciences, School of Physics, Tel-Aviv University, Tel-Aviv, Israel3535Supported by the German–Israel Foundation and the Israel Science Foundation.; M. Kuze; Department of Physics, Tokyo Institute of Technology, Tokyo, Japan37; T. Fusayasu,; S. Kagawa,; T. Kohno,; T. Tawara,; T. Yamashita; Department of Physics, University of Tokyo, Tokyo, Japan37; R. Hamatsu,; M. Inuzuka,; H. Kaji,; K. Matsuzawa; Department of Physics, Tokyo Metropolitan University, Tokyo, Japan37; M.I. Ferrero,; V. Monaco,; R. Sacchi,; A. Solano; Università di Torino and INFN, Torino, Italy36; M. Arneodo,; M. Ruspa; Università del Piemonte Orientale, Novara, and INFN, Torino, Italy36; T. Koop,; J.F. Martin,; A. Mirea; Department of Physics, University of Toronto, Toronto, Ontario, Canada M5S 1A732; R. Hall-Wilton,; T.W. Jones,; M.S. Lightwood,; C. Targett-Adams; Physics and Astronomy Department, University College London, London, United Kingdom44; R.J. Nowak,; J.M. Pawlak,; A.F. Żarnecki; Institute of Experimental Physics, Warsaw University, Warsaw, Poland4848Supported by the Polish State Committee for Scientific Research, Grant No. 115/E-343/SPUB-M/DESY/P-03/DZ 121/2001-2002, 2 P03B 07022.; M. Adamus,; P. Plucinski; Institute for Nuclear Studies, Warsaw, Poland48; Y. Eisenberg,; D. Hochman,; U. Karshon,; M. Riveline; Department of Particle Physics, Weizmann Institute, Rehovot, Israel3434Supported by the MINERVA Gesellschaft für Forschung GmbH, the Israel Science Foundation, the US–Israel Binational Science Foundation and the Benozyio Center for High Energy Physics.; D. Kçira,; S. Lammers,; L. Li,; D.D. Reeder,; M. Rosin,; A.A. Savin,; W.H. Smith; Department of Physics, University of Wisconsin, Madison, WI 53706, USA45; A. Deshpande,; S. Dhawan; Department of Physics, Yale University, New Haven, CT 06520-8121, USA45; S. Bhadra,; C.D. Catterall,; S. Fourletov,; G. Hartner,; S. Menary,; M. Soares,; J. Standage; Department of Physics, York University, Ontario, Canada M3J 1P332
Physics Letters B DOI: 10.1016/j.physletb.2004.03.081

ABSTRACT A search for physics beyond the Standard Model has been performed with high-Q2 neutral current deep inelastic scattering events recorded with the ZEUS detector at HERA. Two data sets, e+p→e+X and e−p→e−X, with respective integrated luminosities of 112 pb−1 and 16 pb−1, were analyzed. The data reach Q2 values as high as 40 000 GeV2. No significant deviations from Standard Model predictions were observed. Limits were derived on the effective mass scale in eeqq contact interactions, the ratio of leptoquark mass to the Yukawa coupling for heavy leptoquark models and the mass scale parameter in models with large extra dimensions. The limit on the quark charge radius, in the classical form factor approximation, is 0.85×10−16 cm.

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Jun 16, 2014