Abstract
A search for a scalar top quark has been performed using a total data sample of 10.4 pb-1 at centre-of-mass energies of √s = 170 and 172 GeV collected with the OPAL detector at LEP. No candidate events were observed. Combining this result with those obtained at √s = 130, 136 and 161 GeV, the 95% C.L. lower limit on the scalar top quark mass is 66.8 GeV, if the mixing angle between the supersymmetric partners of the left- and right-handed states of the top quark is smaller than π/4. If the mixing angle is zero, the limit is 73.3 GeV. These limits were obtained assuming that the scalar top quark decays into a charm quark and the lightest neutralino, and that the mass difference between the scalar top quark and the lightest neutralino is larger than 10 GeV. The complementary decay mode of the scalar top quark in which it decays into a bottom quark, a charged lepton and a scalar neutrino was also studied. From a similar analysis, a mass limit on the light scalar bottom quark was set at 69.7 GeV, for a mixing angle between the supersymmetric partners of the left- and right-handed states of the bottom quark of zero, and the mass difference between the scalar bottom quark and the lightest neutralino larger than 8 GeV.
| Original language | English (US) |
|---|---|
| Pages (from-to) | 409-420 |
| Number of pages | 12 |
| Journal | Zeitschrift fur Physik C-Particles and Fields |
| Volume | 75 |
| Issue number | 3 |
| DOIs | |
| State | Published - Jul 1997 |
ASJC Scopus subject areas
- Physics and Astronomy (miscellaneous)
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In: Zeitschrift fur Physik C-Particles and Fields, Vol. 75, No. 3, 07.1997, p. 409-420.
Research output: Contribution to journal › Article › peer-review
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TY - JOUR
T1 - Search for scalar top and scalar bottom quarks at √s = 170-172 GeV in e+e- collisions
AU - Ackerstaff, K.
AU - Alexander, G.
AU - Allison, J.
AU - Altekamp, N.
AU - Anderson, K. J.
AU - Anderson, S.
AU - Arcelli, S.
AU - Asai, S.
AU - Axen, D.
AU - Azuelos, G.
AU - Ball, A. H.
AU - Barberio, E.
AU - Barlow, R. J.
AU - Bartoldus, R.
AU - Batley, J. R.
AU - Baumann, S.
AU - Bechtluft, J.
AU - Beeston, C.
AU - Behnke, T.
AU - Bell, A. N.
AU - Bell, K. W.
AU - Bella, G.
AU - Bentvelsen, S.
AU - Berlich, P.
AU - Bethke, S.
AU - Biebel, O.
AU - Biguzzi, A.
AU - Bird, S. D.
AU - Blobel, V.
AU - Bloodworth, I. J.
AU - Bloomer, J. E.
AU - Bobinski, M.
AU - Bock, P.
AU - Bonacorsi, D.
AU - Boutemeur, M.
AU - Bouwens, B. T.
AU - Braibant, S.
AU - Brigliadori, L.
AU - Brown, R. M.
AU - Burckhart, H. J.
AU - Burgard, C.
AU - Bürgin, R.
AU - Capiluppi, P.
AU - Carnegie, R. K.
AU - Carter, A. A.
AU - Carter, J. R.
AU - Chang, C. Y.
AU - Charlton, D. G.
AU - Chrisman, D.
AU - Clarke, P. E.L.
AU - Cohen, I.
AU - Conboy, J. E.
AU - Cooke, O. C.
AU - Cuffiani, M.
AU - Dado, S.
AU - Dallapiccola, C.
AU - Dallavalle, G. M.
AU - De Jong, S.
AU - Del Pozo, L. A.
AU - Desch, K.
AU - Dixit, M. S.
AU - Do Couto E Silva, E.
AU - Doucet, M.
AU - Duchovni, E.
AU - Duckeck, G.
AU - Duerdoth, I. P.
AU - Eatough, D.
AU - Edwards, J. E.G.
AU - Estabrooks, P. G.
AU - Evans, H. G.
AU - Evans, M.
AU - Fabbri, F.
AU - Fanti, M.
AU - Faust, A. A.
AU - Fiedler, F.
AU - Fierro, M.
AU - Fischer, H. M.
AU - Fleck, I.
AU - Folman, R.
AU - Fong, D. G.
AU - Foucher, M.
AU - Fürtjes, A.
AU - Futyan, D. I.
AU - Gagnon, P.
AU - Gary, J. W.
AU - Gascon, J.
AU - Gascon-Shotkin, S. M.
AU - Geddes, N. I.
AU - Geich-Gimbel, C.
AU - Geralis, T.
AU - Giacomelli, G.
AU - Giacomelli, P.
AU - Giacomelli, R.
AU - Gibson, V.
AU - Gibson, W. R.
AU - Gingrich, D. M.
AU - Glenzinski, D.
AU - Goldberg, J.
AU - Goodrick, M. J.
AU - Gorn, W.
AU - Grandi, C.
AU - Gross, E.
AU - Grunhaus, J.
AU - Gruwé, M.
AU - Hajdu, C.
AU - Hanson, G. G.
AU - Hansroul, M.
AU - Hapke, M.
AU - Hargrove, C. K.
AU - Hart, P. A.
AU - Hartmann, C.
AU - Hauschild, M.
AU - Hawkes, C. M.
AU - Hawkings, R.
AU - Hemingway, R. J.
AU - Herndon, M.
AU - Herten, G.
AU - Heuer, R. D.
AU - Hildreth, M. D.
AU - Hill, J. C.
AU - Hillier, S. J.
AU - Hilse, T.
AU - Hobson, P. R.
AU - Homer, R. J.
AU - Honma, A. K.
AU - Horváth, D.
AU - Howard, R.
AU - Hutchcroft, D. E.
AU - Igo-Kemenes, P.
AU - Imrie, D. C.
AU - Ingram, M. R.
AU - Ishii, K.
AU - Jawahery, A.
AU - Jeffreys, P. W.
AU - Jeremie, H.
AU - Jimack, M.
AU - Joly, A.
AU - Jones, C. R.
AU - Jones, G.
AU - Jones, M.
AU - Jost, U.
AU - Jovanovic, P.
AU - Junk, T. R.
AU - Karlen, D.
AU - Kartvelishvili, V.
AU - Kawagoe, K.
AU - Kawamoto, T.
AU - Keeler, R. K.
AU - Kellogg, R. G.
AU - Kennedy, B. W.
AU - Kirk, J.
AU - Klier, A.
AU - Kluth, S.
AU - Kobayashi, T.
AU - Kobel, M.
AU - Koetke, D. S.
AU - Kokott, T. P.
AU - Kolrep, M.
AU - Komamiya, S.
AU - Kress, T.
AU - Krieger, P.
AU - Von Krogh, J.
AU - Kyberd, P.
AU - Lafferty, G. D.
AU - Lahmann, R.
AU - Lai, W. P.
AU - Lanske, D.
AU - Lauber, J.
AU - Lautenschlager, S. R.
AU - Layter, J. G.
AU - Lazic, D.
AU - Lee, A. M.
AU - Lefebvre, E.
AU - Lellouch, D.
AU - Letts, J.
AU - Levinson, L.
AU - Lloyd, S. L.
AU - Loebinger, F. K.
AU - Long, G. D.
AU - Losty, M. J.
AU - Ludwig, J.
AU - Macchiolo, A.
AU - Macpherson, A.
AU - Mannelli, M.
AU - Marcellini, S.
AU - Markus, C.
AU - Martin, A. J.
AU - Martin, J. P.
AU - Martinez, G.
AU - Mashimo, T.
AU - Mättig, P.
AU - McDonald, W. J.
AU - McKenna, J.
AU - Mckigney, E. A.
AU - McMahon, T. J.
AU - McPherson, R. A.
AU - Meijers, F.
AU - Menke, S.
AU - Merritt, F. S.
AU - Mes, H.
AU - Meyer, J.
AU - Michelini, A.
AU - Mikenberg, G.
AU - Miller, D. J.
AU - Mincer, A.
AU - Mir, R.
AU - Mohr, W.
AU - Montanari, A.
AU - Mori, T.
AU - Morii, M.
AU - Müller, U.
AU - Nagai, K.
AU - Nakamura, I.
AU - Neal, H. A.
AU - Nellen, B.
AU - Nisius, R.
AU - O'Neale, S. W.
AU - Oakham, F. G.
AU - Odorici, F.
AU - Ogren, H. O.
AU - Oldershaw, N. J.
AU - Oreglia, M. J.
AU - Orito, S.
AU - Pálinkas, J.
AU - Pásztor, G.
AU - Pater, J. R.
AU - Patrick, G. N.
AU - Patt, J.
AU - Pearce, M. J.
AU - Petzold, S.
AU - Pfeifenschneider, P.
AU - Pilcher, J. E.
AU - Pinfold, J.
AU - Plane, D. E.
AU - Poffenberger, P.
AU - Poli, B.
AU - Posthaus, A.
AU - Przysiezniak, H.
AU - Rees, D. L.
AU - Rigby, D.
AU - Robertson, S.
AU - Robins, S. A.
AU - Rodning, N.
AU - Roney, J. M.
AU - Rooke, A.
AU - Ros, E.
AU - Rossi, A. M.
AU - Rosvick, M.
AU - Routenburg, P.
AU - Rozen, Y.
AU - Runge, K.
AU - Runolfsson, O.
AU - Ruppel, U.
AU - Rust, D. R.
AU - Rylko, R.
AU - Sachs, K.
AU - Saeki, T.
AU - Sarkisyan, E. K.G.
AU - Sbarra, C.
AU - Schaile, A. D.
AU - Schaile, O.
AU - Scharf, F.
AU - Scharff-Hansen, P.
AU - Schenk, P.
AU - Schieck, J.
AU - Schleper, P.
AU - Schmitt, B.
AU - Schmitt, S.
AU - Schöning, A.
AU - Schröder, M.
AU - Schultz-Coulon, H. C.
AU - Schulz, M.
AU - Schumacher, M.
AU - Schwick, C.
AU - Scott, W. G.
AU - Shears, T. G.
AU - Shen, B. C.
AU - Shepherd-Themistocleous, C. H.
AU - Sherwood, P.
AU - Siroli, G. P.
AU - Sittler, A.
AU - Skillman, A.
AU - Skuja, A.
AU - Smith, A. M.
AU - Snow, G. A.
AU - Sobie, R.
AU - Söldner-Rembold, S.
AU - Springer, R. W.
AU - Sproston, M.
AU - Stephens, K.
AU - Steuerer, J.
AU - Stockhausen, B.
AU - Stoll, K.
AU - Strom, D.
AU - Szymanski, P.
AU - Tafirout, R.
AU - Talbot, S. D.
AU - Tanaka, S.
AU - Taras, P.
AU - Tarem, S.
AU - Teuscher, R.
AU - Thiergen, M.
AU - Thomson, M. A.
AU - Von Törne, E.
AU - Towers, S.
AU - Trigger, I.
AU - Tsur, E.
AU - Turcot, A. S.
AU - Turner-Watson, M. F.
AU - Utzat, P.
AU - Van Kooten, R.
AU - Verzocchi, M.
AU - Vikas, P.
AU - Vokurka, E. H.
AU - Voss, H.
AU - Wäckerle, F.
AU - Wagner, A.
AU - Ward, C. P.
AU - Ward, D. R.
AU - Watkins, P. M.
AU - Watson, A. T.
AU - Watson, N. K.
AU - Wells, P. S.
AU - Wermes, N.
AU - White, J. S.
AU - Wilkens, B.
AU - Wilson, G. W.
AU - Wilson, J. A.
AU - Wolf, G.
AU - Wyatt, T. R.
AU - Yamashita, S.
AU - Yekutieli, G.
AU - Zacek, V.
AU - Zer-Zion, D.
N1 - Funding Information: Acknowledgements. We particularly wish to thank the SL Division√ for the efficient operation of the LEP accelerator at the new energies of s = 170– 172 GeV and for their continuing close cooperation with our experimental group. We thank our colleagues from CEA, DAPNIA/SPP, CE-Saclay for their efforts over the years on the time-of-flight and trigger systems which we continue to use. In addition to the support staff at our own institutions we are pleased to acknowledge the Department of Energy, USA, National Science Foundation, USA, Particle Physics and Astronomy Research Council, UK, Natural Sciences and Engineering Research Council, Canada, Israel Science Foundation, administered by the Israel Academy of Science and Humanities, Minerva Gesellschaft, Japanese Ministry of Education, Science and Culture (the Monbusho) and a grant under the Monbusho International Science Research Program, German Israeli Bi-national Science Foundation (GIF), Bundesministerium für Bildung, Wissenschaft, Forschung und Tech-nologie, Germany, National Research Council of Canada, Hungarian Foundation for Scientific Research, OTKA T-016660, and OTKA F-015089.
PY - 1997/7
Y1 - 1997/7
N2 - A search for a scalar top quark has been performed using a total data sample of 10.4 pb-1 at centre-of-mass energies of √s = 170 and 172 GeV collected with the OPAL detector at LEP. No candidate events were observed. Combining this result with those obtained at √s = 130, 136 and 161 GeV, the 95% C.L. lower limit on the scalar top quark mass is 66.8 GeV, if the mixing angle between the supersymmetric partners of the left- and right-handed states of the top quark is smaller than π/4. If the mixing angle is zero, the limit is 73.3 GeV. These limits were obtained assuming that the scalar top quark decays into a charm quark and the lightest neutralino, and that the mass difference between the scalar top quark and the lightest neutralino is larger than 10 GeV. The complementary decay mode of the scalar top quark in which it decays into a bottom quark, a charged lepton and a scalar neutrino was also studied. From a similar analysis, a mass limit on the light scalar bottom quark was set at 69.7 GeV, for a mixing angle between the supersymmetric partners of the left- and right-handed states of the bottom quark of zero, and the mass difference between the scalar bottom quark and the lightest neutralino larger than 8 GeV.
AB - A search for a scalar top quark has been performed using a total data sample of 10.4 pb-1 at centre-of-mass energies of √s = 170 and 172 GeV collected with the OPAL detector at LEP. No candidate events were observed. Combining this result with those obtained at √s = 130, 136 and 161 GeV, the 95% C.L. lower limit on the scalar top quark mass is 66.8 GeV, if the mixing angle between the supersymmetric partners of the left- and right-handed states of the top quark is smaller than π/4. If the mixing angle is zero, the limit is 73.3 GeV. These limits were obtained assuming that the scalar top quark decays into a charm quark and the lightest neutralino, and that the mass difference between the scalar top quark and the lightest neutralino is larger than 10 GeV. The complementary decay mode of the scalar top quark in which it decays into a bottom quark, a charged lepton and a scalar neutrino was also studied. From a similar analysis, a mass limit on the light scalar bottom quark was set at 69.7 GeV, for a mixing angle between the supersymmetric partners of the left- and right-handed states of the bottom quark of zero, and the mass difference between the scalar bottom quark and the lightest neutralino larger than 8 GeV.
UR - http://www.scopus.com/inward/record.url?scp=0001693145&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=0001693145&partnerID=8YFLogxK
U2 - 10.1007/s002880050484
DO - 10.1007/s002880050484
M3 - Article
AN - SCOPUS:0001693145
SN - 0170-9739
VL - 75
SP - 409
EP - 420
JO - Zeitschrift fur Physik C-Particles and Fields
JF - Zeitschrift fur Physik C-Particles and Fields
IS - 3
ER -