Oxana Smirnova
Senior Lecturer, Deputy Head of division
Search for an LSP gluino at LEP with the DELPHI detector
Author
- J Abdallah
- P Abreu
- W Adam
- P Adzic
- T Albrecht
- T Alderweireld
- R Alemany-Fernandez
- T Allmendinger
- PP Allport
- U Amaldi
- N Amapane
- S Amato
- E Anashkin
- A Andreazza
- S Andringa
- N Anjos
- P Antilogus
- WD Apel
- Y Arnoud
- Stefan Ask
- B Asman
- JE Augustin
- A Augustinus
- P Baillon
- A Ballestrero
- P Bambade
- R Barbier
- D Bardin
- G Barker
- A Baroncelli
- M Battaglia
- M Baubillier
- KH Becks
- M Begalli
- A Behrmann
- E Ben-Haim
- N Benekos
- A Benvenuti
- C Berat
- M Berggren
- L Berntzon
- D Bertrand
- M Besancon
- N Besson
- D Bloch
- M Blom
- M Bluj
- M Bonesini
- M Boonekamp
- PSL Booth
- G Borisov
- O Botner
- B Bouquet
- TJV Bowcock
- I Boykc
- M Bracko
- R Brenner
- E Brodet
- P Bruckman
- JM Brunet
- L Bugge
- P Buschmann
- M Calvi
- T Camporesi
- V Canale
- F Carena
- N Castro
- F Cavallo
- M Chapkin
- P Charpentier
- P Checchia
- R Chierici
- P Chliapnikov
- J Chudoba
- SU Chung
- K Cieslik
- P Collins
- R Contri
- G Cosme
- F Cossutti
- MJ Costa
- B Crawley
- D Crennell
- J Cuevas
- J D'Hondt
- J Dalmau
- T da Silva
- W Da Silva
- G Della Ricca
- A De Angelis
- W De Boer
- C De Clercq
- B De Lotto
- N De Maria
- A De Mir
- L de Paula
- L Di Ciaccio
- A Di Simone
- K Doroba
- J Drees
- M Dris
- G Eigen
- T Ekelof
- M Ellert
- M Elsing
- MCE Santo
- G Fanourakis
- D Fassouliotis
- M Feindt
- J Fernandez
- A Ferrer
- F Ferro
- U Flagmeyer
- H Foeth
- E Fokitis
- F Fulda-Quenzer
- J Fuster
- M Gandelman
- C Garcia
- P Gavillet
- E Gazis
- T Geralis
- R Gokieli
- B Golob
- G Gomez-Ceballos
- P Goncalves
- E Graziani
- G Grosdidier
- K Grzelak
- J Guy
- C Haag
- A Hallgren
- K Hamacher
- K Hamilton
- J Hansen
- S Haug
- F Hauler
- Vincent Hedberg
- M Hennecke
- H Herr
- J Hoffman
- SO Hohngren
- PJ Holt
- MA Houlden
- K Hultqvist
- JN Jackson
- G Jarlskog
- P Jarry
- D Jeans
- EK Johansson
- PD Johansson
- P Jonsson
- C Joram
- L Jungermann
- F Kapusta
- S Katsanevas
- E Katsoufis
- G Kernel
- BP Kersevan
- A Kiiskinen
- BT King
- NJ Kjaer
- P Kluit
- P Kokkinias
- C Kourkoumelis
- O Kouznetsov
- Z Krumstein
- M Kucharczyk
- J Lamsa
- G Leder
- F Ledroit
- L Leinonen
- R Leitner
- J Lemonne
- V Lepeltier
- T Lesiak
- W Liebig
- D Liko
- A Lipniacka
- JH Lopes
- JM Lope
- D Loukas
- P Lutz
- L Lyons
- J MacNaughton
- A Malek
- S Maltezos
- F Mandl
- J Marco
- R Marco
- B Marechal
- M Margoni
- JC Marin
- C Mariotti
- A Markou
- C Martinez-Rivero
- J Masik
- N Mastroyiannopoulos
- F Matorras
- C Matteuzzi
- F Mazzucato
- M Mazzucato
- R Mc Nulty
- C Meroni
- WT Meyer
- E Mighore
- W Mitaroff
- Ulf Mjörnmark
- T Moa
- M Moch
- K Moenig
- R Monge
- J Montenegro
- D Moraes
- S Moreno
- P Morettini
- U Mueller
- K Muenich
- M Mulders
- L Mundim
- W Murray
- B Muryn
- G Myatt
- T Myklebust
- M Nassiakou
- F Navarria
- K Nawrocki
- R Nicolaidou
- M Nikolenko
- A Oblakowska-Mucha
- V Obraztsov
- A Olshevski
- A Onofre
- R Orava
- K Osterberg
- A Ouraou
- A Oyanguren
- M Paganoni
- S Paiano
- JP Palacios
- H Palka
- TD Papadopoulou
- L Pape
- C Parkes
- F Parodi
- U Parzefall
- A Passeri
- O Passon
- L Peralta
- V Perepelitsa
- A Perrotta
- A Petrolini
- J Piedra
- L Pieri
- F Pierre
- M Pimenta
- E Piotto
- T Podobnik
- V Poireau
- ME Pol
- G Polok
- P Poropat
- V Pozdniakov
- N Pukhaeva
- A Pullia
- J Rames
- L Ramler
- A Read
- P Rebecchi
- J Rehn
- D Reid
- R Reinhardt
- P Renton
- F Richard
- J Ridky
- M Rivero
- D Rodriguez
- A Romero
- P Ronchese
- E Rosenberg
- P Roudeau
- T Rovelli
- V Ruhlmann-Kleider
- D Ryabtchikov
- A Sadovsky
- L Salmi
- J Salt
- A Savoy-Navarro
- U Schwickerath
- A Segar
- R Sekulin
- M Siebel
- A Sisakian
- G Smadja
- Oxana Smirnova
- A Sokolov
- A Sopczak
- R Sosnowski
- T Spassov
- M Stanitzki
- A Stocchi
- J Strauss
- B Stugu
- M Szczekowski
- M Szeptycka
- T Szumlak
- T Tabarelli
- AC Taffard
- F Tegenfeldt
- J Timmermans
- L Tkatchev
- M Tobin
- S Todorovova
- A Tomaradze
- B Tome
- A Tonazzo
- P Tortosa
- P Travnicek
- D Treille
- G Tristram
- M Trochimczuk
- C Troncon
- ML Turluer
- IA Tyapkin
- P Tyapkin
- S Tzamarias
- V Uvarov
- G Valenti
- P Van Dam
- J Van Eldik
- A Van Lysebetten
- N van Remortel
- I Van Vulpen
- G Vegni
- F Veloso
- W Venus
- F Verbeure
- P Verdier
- V Verzi
- D Vilanova
- L Vitale
- V Vrba
- H Wahlen
- AJ Washbrook
- C Weiser
- D Wicke
- J Wicken
- G Wilkinson
- M Winter
- M Witek
- O Yushchenko
- A Zalewska
- P Zalewski
- D Zavrtanik
- NI Zimin
- A Zintchenko
- M Zupan
Summary, in English
In some supersymmetric models, the gluino ((g) over tilde) is predicted to be light and stable. In that case, it would hadronize to form R-hadrons. In these models, the missing energy signature of the lightest supersymmetric particle is no longer valid, even if R-parity is conserved. Therefore, such a gluino is not constrained by hadron collider results, which looked for the decay (g) over tilde --> q (q) over bar(χ) over tilde (0)(1). Data collected by the DELPHI detector in 1994 at 91.2 GeV have been analysed to search for q (q) over bar(gg) over tilde events. No deviation from Standard Model predictions is observed and a gluino mass between 2 and 18 GeV/c(2) is excluded at the 95% confidence level in these models. Then, R-hadrons produced in the squark decays were searched for in the data collected by DELPHI at the centre-of-mass energies of 189 to 208 GeV, corresponding to an overall integrated luminosity of 609 pb(-1). The observed number of events is in agreement with the Standard Model predictions. Limits at 95% confidence level are derived on the squark masses from the excluded regions in the plane (m((q) over tilde1),m((g) over bar)): m((t) over tilde1) > 90 GeV/c(2) and m((b) over tilde1) > 96 GeV/c(2) for purely left squarks. m((t) over tilde1) > 87 GeV/c(2) and m((b) over tilde1) > 82 GeV/c(2) independent of the mixing angle.
Department/s
- Particle and nuclear physics
Publishing year
2003
Language
English
Pages
505-525
Publication/Series
European Physical Journal C. Particles and Fields
Volume
26
Issue
4
Document type
Journal article
Publisher
Springer
Topic
- Subatomic Physics
Status
Published
ISBN/ISSN/Other
- ISSN: 1434-6044