Leif Jönsson
Professor emeritus
Search for single top quark production in ep collisions at HERA
Author
- A Aktas
- V Andreev
- T Anthonis
- A Asmone
- A Babaev
- S Backovic
- J Bahr
- P Baranov
- E Barrelet
- W Bartel
- S Baumgartner
- J Becker
- M Beckingham
- O Behnke
- O Behrendt
- A Belousov
- C Berger
- T Berndt
- JC Bizot
- J Bohme
- MO Boenig
- V Boudry
- J Bracinik
- W Braunschweig
- V Brisson
- HB Broker
- DP Brown
- D Bruncko
- FW Busser
- A Bunyatyan
- G Buschhorn
- L Bystritskaya
- AJ Campbell
- S Caron
- F Cassol-Brunner
- V Chekelian
- D Clarke
- C Collard
- JG Contreras
- YR Coppens
- JA Coughlan
- MC Cousinou
- BE Cox
- G Cozzika
- J Cvach
- JB Dainton
- WD Dau
- K Daum
- B Delcourt
- N Delerue
- R Demirchyan
- A De Roeck
- EA De Wolf
- C Diaconu
- J Dingfelder
- V Dodonov
- JD Dowell
- A Dubak
- C Duprel
- G Eckerlin
- V Efremenko
- S Egli
- R Eichler
- F Eisele
- M Ellerbrock
- E Elsen
- M Erdmann
- W Erdmann
- PJW Faulkner
- L Favart
- A Fedotov
- R Felst
- J Ferencei
- M Fleischer
- P Fleischmann
- YH Fleming
- G Flucke
- G Flugge
- A Fomenko
- I Foresti
- J Formanek
- G Franke
- G Frising
- E Gabathuler
- K Gabathuler
- J Garvey
- J Gassner
- J Gayler
- R Gerhards
- C Gerlich
- S Ghazaryan
- L Goerlich
- N Gogitidze
- S Gorbounov
- C Grab
- V Grabski
- H Grassler
- T Greenshaw
- M Gregori
- G Grindhammer
- D Haidt
- L Hajduk
- J Haller
- G Heinzelmann
- RCW Henderson
- H Henschel
- O Henshaw
- R Heremans
- G Herrera
- I Herynek
- M Hildebrandt
- KH Hiller
- J Hladky
- P Hoting
- D Hoffmann
- R Horisberger
- A Hovhannisyan
- M Ibbotson
- M Jacquet
- L Janauschek
- X Janssen
- V Jemanov
- Leif Jönsson
- C Johnson
- DP Johnson
- Hannes Jung
- D Kant
- M Kapichine
- Martin Karlsson
- J Katzy
- F Keil
- N Keller
- J Kennedy
- IR Kenyon
- C Kiesling
- M Klein
- C Kleinwort
- T Kluge
- G Knies
- B Koblitz
- SD Kolya
- V Korbel
- P Kostka
- R Koutouev
- A Kropivnitskaya
- J Kroseberg
- J Kueckens
- T Kuhr
- MPJ Landon
- W Lange
- T Lastovicka
- P Laycock
- A Lebedev
- B Leissner
- R Lemrani
- V Lendermann
- S Levonian
- B List
- E Lobodzinska
- N Loktionova
- R Lopez-Fernandez
- V Lubimov
- H Lueders
- S Luders
- D Luke
- L Lytkin
- A Makankine
- N Malden
- E Malinovski
- S Mangano
- P Marage
- J Marks
- R Marshall
- HU Martyn
- J Martyniak
- SJ Maxfield
- D Meer
- A Mehta
- K Meier
- AB Meyer
- H Meyer
- J Meyer
- S Michine
- S Mikocki
- D Milstead
- F Moreau
- A Morozov
- JV Morris
- K Muller
- P Murin
- V Nagovizin
- B Naroska
- J Naumann
- T Naumann
- PR Newman
- F Niebergall
- C Niebuhr
- D Nikitin
- G Nowak
- M Nozicka
- B Olivier
- JE Olsson
- D Ozerov
- C Pascaud
- GD Patel
- M Peez
- E Perez
- A Petrukhin
- D Pitzl
- R Poschl
- B Povh
- N Raicevic
- J Rauschenberger
- P Reimer
- B Reisert
- C Risler
- E Rizvi
- P Robmann
- R Roosen
- A Rostovtsev
- S Rusakov
- K Rybicki
- DPC Sankey
- E Sauvan
- S Schatzel
- J Scheins
- FP Schilling
- P Schleper
- D Schmidt
- S Schmidt
- S Schmitt
- M Schneider
- L Schoeffel
- A Schoning
- V Schroder
- HC Schultz-Coulon
- C Schwanenberger
- K Sedlak
- F Sefkow
- I Sheviakov
- LN Shtarkov
- Y Sirois
- T Sloan
- P Smirnov
- Y Soloviev
- D South
- V Spaskov
- A Specka
- H Spitzer
- R Stamen
- B Stella
- J Stiewe
- I Strauch
- U Straumann
- G Thompson
- PD Thompson
- F Tomasz
- D Traynor
- P Truol
- G Tsipolitis
- I Tsurin
- J Turnau
- JE Turney
- E Tzamariudaki
- A Uraev
- M Urban
- A Usik
- S Valkar
- A Valkarova
- C Vallee
- P Van Mechelen
- AV Trevino
- S Vassiliev
- Y Vazdik
- C Veelken
- A Vest
- A Vichnevski
- V Volchinski
- K Wacker
- J Wagner
- B Waugh
- G Weber
- R Weber
- D Wegener
- C Werner
- N Werner
- M Wessels
- B Wessling
- M Winde
- GG Winter
- C Wissing
- EE Woehrling
- E Wunsch
- J Zacek
- J Zalesak
- Z Zhang
- A Zhokin
- F Zomer
- M zur Nedden
Summary, in English
A search for single top quark production is performed in e(+/-) pcollisions at HERA. The search exploits data corresponding to an integrated luminosity of 118.3 pb(-1). A model for the anomalous production of top quarks in a flavour changing neutral current process involving a tugamma coupling is investigated. Decays of top quarks into a b quark and a W boson are considered in the leptonic and the hadronic decay channels of the W. Both a cut-based analysis and a multivariate likelihood analysis are performed to discriminate anomalous top quark production from Standard Model background processes. In the leptonic channel, 5 events are found while 1.31 +/- 0.22 events are expected from the Standard Model background. In the hadronic channel, no excess above the expectation for Standard Model processes is found. These observations lead to a cross section (ep --> e t X) = 0.29(-0.14)(+0.15) pb at roots = 319 GeV. Alternatively, assuming that the observed events are due to a statistical fluctuation, upper limits of 0.55 pb on the anomalous top production cross section and of 0.27 on the tugamma coupling k(tugamma) are established at the 95% confidence level.
Department/s
- Particle and nuclear physics
Publishing year
2004
Language
English
Pages
9-22
Publication/Series
European Physical Journal C. Particles and Fields
Volume
33
Issue
1
Document type
Journal article
Publisher
Springer
Topic
- Subatomic Physics
Status
Published
ISBN/ISSN/Other
- ISSN: 1434-6044