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Search for an LSP gluino at LEP with the DELPHI detector

Abdallah, J; Abreu, P; Adam, W; Adzic, P; Albrecht, T; Alderweireld, T; Alemany-Fernandez, R; Allmendinger, T; Allport, PP and Amaldi, U, et al. (2003) In European Physical Journal C. Particles and Fields 26(4). p.505-525
Abstract
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 In these models, the missing energy signature of the lightest supersymmetric particle is no longer valid, even if R-parity is conserved.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... (More)
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 In these models, the missing energy signature of the lightest supersymmetric particle is no longer valid, even if R-parity is conserved.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. (Less)
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European Physical Journal C. Particles and Fields
volume
26
issue
4
pages
505 - 525
publisher
Springer
external identifiers
  • wos:000181578800002
  • scopus:0037291917
ISSN
1434-6044
DOI
10.1140/epjc/s2002-01111-5
language
English
LU publication?
yes
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f20462ef-d1f0-437f-98c4-391647459527 (old id 315860)
date added to LUP
2007-08-21 10:43:54
date last changed
2018-01-07 09:01:08
@article{f20462ef-d1f0-437f-98c4-391647459527,
  abstract     = {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.},
  author       = {Abdallah, J and Abreu, P and Adam, W and Adzic, P and Albrecht, T and Alderweireld, T and Alemany-Fernandez, R and Allmendinger, T and Allport, PP and Amaldi, U and Amapane, N and Amato, S and Anashkin, E and Andreazza, A and Andringa, S and Anjos, N and Antilogus, P and Apel, WD and Arnoud, Y and Ask, Stefan and Asman, B and Augustin, JE and Augustinus, A and Baillon, P and Ballestrero, A and Bambade, P and Barbier, R and Bardin, D and Barker, G and Baroncelli, A and Battaglia, M and Baubillier, M and Becks, KH and Begalli, M and Behrmann, A and Ben-Haim, E and Benekos, N and Benvenuti, A and Berat, C and Berggren, M and Berntzon, L and Bertrand, D and Besancon, M and Besson, N and Bloch, D and Blom, M and Bluj, M and Bonesini, M and Boonekamp, M and Booth, PSL and Borisov, G and Botner, O and Bouquet, B and Bowcock, TJV and Boykc, I and Bracko, M and Brenner, R and Brodet, E and Bruckman, P and Brunet, JM and Bugge, L and Buschmann, P and Calvi, M and Camporesi, T and Canale, V and Carena, F and Castro, N and Cavallo, F and Chapkin, M and Charpentier, P and Checchia, P and Chierici, R and Chliapnikov, P and Chudoba, J and Chung, SU and Cieslik, K and Collins, P and Contri, R and Cosme, G and Cossutti, F and Costa, MJ and Crawley, B and Crennell, D and Cuevas, J and D'Hondt, J and Dalmau, J and da Silva, T and Da Silva, W and Della Ricca, G and De Angelis, A and De Boer, W and De Clercq, C and De Lotto, B and De Maria, N and De Mir, A and de Paula, L and Di Ciaccio, L and Di Simone, A and Doroba, K and Drees, J and Dris, M and Eigen, G and Ekelof, T and Ellert, M and Elsing, M and Santo, MCE and Fanourakis, G and Fassouliotis, D and Feindt, M and Fernandez, J and Ferrer, A and Ferro, F and Flagmeyer, U and Foeth, H and Fokitis, E and Fulda-Quenzer, F and Fuster, J and Gandelman, M and Garcia, C and Gavillet, P and Gazis, E and Geralis, T and Gokieli, R and Golob, B and Gomez-Ceballos, G and Goncalves, P and Graziani, E and Grosdidier, G and 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Markou, A and Martinez-Rivero, C and Masik, J and Mastroyiannopoulos, N and Matorras, F and Matteuzzi, C and Mazzucato, F and Mazzucato, M and Mc Nulty, R and Meroni, C and Meyer, WT and Mighore, E and Mitaroff, W and Mjörnmark, Ulf and Moa, T and Moch, M and Moenig, K and Monge, R and Montenegro, J and Moraes, D and Moreno, S and Morettini, P and Mueller, U and Muenich, K and Mulders, M and Mundim, L and Murray, W and Muryn, B and Myatt, G and Myklebust, T and Nassiakou, M and Navarria, F and Nawrocki, K and Nicolaidou, R and Nikolenko, M and Oblakowska-Mucha, A and Obraztsov, V and Olshevski, A and Onofre, A and Orava, R and Osterberg, K and Ouraou, A and Oyanguren, A and Paganoni, M and Paiano, S and Palacios, JP and Palka, H and Papadopoulou, TD and Pape, L and Parkes, C and Parodi, F and Parzefall, U and Passeri, A and Passon, O and Peralta, L and Perepelitsa, V and Perrotta, A and Petrolini, A and Piedra, J and Pieri, L and Pierre, F and Pimenta, M and Piotto, E and Podobnik, T and Poireau, V and Pol, ME and Polok, G and Poropat, P and Pozdniakov, V and Pukhaeva, N and Pullia, A and Rames, J and Ramler, L and Read, A and Rebecchi, P and Rehn, J and Reid, D and Reinhardt, R and Renton, P and Richard, F and Ridky, J and Rivero, M and Rodriguez, D and Romero, A and Ronchese, P and Rosenberg, E and Roudeau, P and Rovelli, T and Ruhlmann-Kleider, V and Ryabtchikov, D and Sadovsky, A and Salmi, L and Salt, J and Savoy-Navarro, A and Schwickerath, U and Segar, A and Sekulin, R and Siebel, M and Sisakian, A and Smadja, G and Smirnova, Oxana and Sokolov, A and Sopczak, A and Sosnowski, R and Spassov, T and Stanitzki, M and Stocchi, A and Strauss, J and Stugu, B and Szczekowski, M and Szeptycka, M and Szumlak, T and Tabarelli, T and Taffard, AC and Tegenfeldt, F and Timmermans, J and Tkatchev, L and Tobin, M and Todorovova, S and Tomaradze, A and Tome, B and Tonazzo, A and Tortosa, P and Travnicek, P and Treille, D and Tristram, G and Trochimczuk, M and Troncon, C and Turluer, ML and Tyapkin, IA and Tyapkin, P and Tzamarias, S and Uvarov, V and Valenti, G and Van Dam, P and Van Eldik, J and Van Lysebetten, A and van Remortel, N and Van Vulpen, I and Vegni, G and Veloso, F and Venus, W and Verbeure, F and Verdier, P and Verzi, V and Vilanova, D and Vitale, L and Vrba, V and Wahlen, H and Washbrook, AJ and Weiser, C and Wicke, D and Wicken, J and Wilkinson, G and Winter, M and Witek, M and Yushchenko, O and Zalewska, A and Zalewski, P and Zavrtanik, D and Zimin, NI and Zintchenko, A and Zupan, M},
  issn         = {1434-6044},
  language     = {eng},
  number       = {4},
  pages        = {505--525},
  publisher    = {Springer},
  series       = {European Physical Journal C. Particles and Fields},
  title        = {Search for an LSP gluino at LEP with the DELPHI detector},
  url          = {http://dx.doi.org/10.1140/epjc/s2002-01111-5},
  volume       = {26},
  year         = {2003},
}