Search for single-top production in ep collisions at HERA

被引：98

作者：

Chekanov, S

Derrick, M

Krakauer, D

Loizides, JH

Magill, S

Musgrave, B

Repond, J

Yoshida, R

Mattingly, MCK

Antonioli, P

Bari, G

Basile, M

Bellagamba, L

Boscherini, D

Bruni, A

Bruni, G

Romeo, GC

Cifarelli, L

Cindolo, R

Contin, A

Corradi, M

De Pasquale, S

Giusti, P

Iacobucci, G

Margotti, A

Nania, R

Palmonari, F

Pesci, A

Saitorelli, G

Zichichi, A

Aghuzumtsyan, G

Bartsch, D

Brock, I

Goers, S

Hartmann, H

Hilger, E

Irrgang, P

Jakob, HP

Kappes, A

Katz, UF

Kind, O

Meyer, U

Paul, E

Rautenberg, J

Renner, R

Stifutkin, A

Tandler, J

Voss, KC

Wang, M

Weber, A

机构：

[1] Argonne Natl Lab, Argonne, IL 60439 USA

[2] Andrews Univ, Berrien Springs, MI 49104 USA

[3] Univ Bologna, Bologna, Italy

[4] Ist Nazl Fis Nucl, I-40126 Bologna, Italy

[5] Univ Bonn, Inst Phys, D-5300 Bonn, Germany

[6] Univ Bristol, HH Wills Phys Lab, Bristol BS8 1TL, Avon, England

[7] Univ Calabria, Dept Phys, I-87036 Cosenza, Italy

[8] Ist Nazl Fis Nucl, Cosenza, Italy

[9] Chonnam Natl Univ, Kwangju, South Korea

[10] Columbia Univ, Nevis Labs, Hudson, NY 10027 USA

[11] Inst Nucl Phys, Krakow, Poland

[12] Univ Min & Met Krakow, Fac Phys & Nucl Tech, Krakow, Poland

[13] Jagiellonian Univ, Dept Phys, Krakow, Poland

[14] DESY, D-2000 Hamburg, Germany

[15] DESY, Zeuthen, Germany

[16] Univ Florence, Florence, Italy

[17] Ist Nazl Fis Nucl, I-50125 Florence, Italy

[18] Univ Freiburg, Fak Phys, D-7800 Freiburg, Germany

[19] Univ Glasgow, Dept Phys & Astron, Glasgow, Lanark, Scotland

[20] Univ Hamburg, Inst Expt Phys, Hamburg, Germany

[21] Univ London Imperial Coll Sci Technol & Med, High Energy Nucl Phys Grp, London, England

[22] Forschungszentrum, Inst Kernphys, Julich, Germany

[23] KEK, Inst Particle & Nucl Studies, Tsukuba, Ibaraki, Japan

[24] Minist Educ & Sci Kazakhstan, Inst Phys & Technol, Alma Ata, Kazakhstan

[25] Kyungpook Natl Univ, Taegu 702701, South Korea

[26] Catholic Univ Louvain, Inst Phys Nucl, B-1348 Louvain, Belgium

[27] Univ Autonoma Madrid, Dept Fis Teor, Madrid, Spain

[28] McGill Univ, Dept Phys, Montreal, PQ H3A 2T8, Canada

[29] Meiji Gakuin Inst, Fac Gen Educ, Yokohama, Kanagawa, Japan

[30] Moscow Engn Phys Inst, Moscow 115409, Russia

[31] Moscow MV Lomonosov State Univ, Inst Nucl Phys, Moscow, Russia

[32] NIKHEF H, NL-1009 DB Amsterdam, Netherlands

[33] Univ Amsterdam, Amsterdam, Netherlands

[34] Ohio State Univ, Dept Phys, Columbus, OH 43210 USA

[35] Univ Oxford, Dept Phys, Oxford, England

[36] Univ Padua, Dipartimento Fis, Padua, Italy

[37] Ist Nazl Fis Nucl, Padua, Italy

[38] Penn State Univ, Dept Phys, University Pk, PA 16802 USA

[39] Polytech Univ, Sagamihara, Kanagawa, Japan

[40] Univ Roma La Sapienza, Dipartimento Fis, I-00185 Rome, Italy

[41] Ist Nazl Fis Nucl, Rome, Italy

[42] Rutherford Appleton Lab, Didcot OX11 0QX, Oxon, England

[43] Univ Calif Santa Cruz, Santa Cruz, CA 95064 USA

[44] Ewha Womans Univ, Dept Phys, Seoul, South Korea

[45] Univ Siegen, Fachbereich Phys, D-5900 Siegen, Germany

[46] Tel Aviv Univ, Sch Phys, Raymond & Beverly Sackler Fac Exact Sci, IL-69978 Tel Aviv, Israel

[47] Univ Tokyo, Dept Phys, Tokyo 113, Japan

[48] Tokyo Metropolitan Univ, Dept Phys, Tokyo 113, Japan

[49] Univ Turin, Dipartimento Fis Sperimentale, Turin, Italy

[50] Ist Nazl Fis Nucl, I-10125 Turin, Italy

来源：

PHYSICS LETTERS B | 2003年 / 559卷 / 3-4期

关键词：

D O I：

10.1016/S0370-2693(03)00333-2

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

A search for single-top production, ep --> et X, has been made with the ZEUS detector at HERA using an integrated luminosity of 130.1 pb(-1). Events from both the leptonic and hadronic decay channels of the W boson resulting from the decay of the top quark were sought. For the leptonic mode, the search was made for events with isolated high-energy leptons and significant missing transverse momentum. For the hadronic decay mode, three-jet events in which two of the jets had an invariant mass consistent with that of the W were selected. No evidence for top production was found. The results are used to constrain single-top production via flavour-changing neutral current (FCNC) transitions. The ZEUS limit excludes a substantial region in the FCNC tugamma coupling not ruled out by other experiments. (C) 2003 Published by Elsevier Science B.V.

引用

页码：153 / 170

页数：18

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