Search for a scalar top quark using the OPAL detector

Akers, R.; Alexander, G.; Allison, J.; Anderson, K. J.; Arcelli, S.; Asai, S.; Astbury, A.; Axen, D.; Azuelos, G.; Ball, A. H.; Barberio, E.; Barlow, R. J.; Bartoldus, R.; Batley, J. R.; Beaudoin, G.; Beck, A.; Beck, G. A.; Becker, J.; Beeston, C.; Behnke, T.; Bell, K. W.; Bella, G.; Bentkowski, P.; Bentvelsen, S.; Berlich, P.; Bethke, S.; Biebel, O.; Bloodworth, I. J.; Bock, P.; Bosch, H. M.; Boutemeur, M.; Braibant, S.; Bright-Thomas, P.; Brown, R. M.; Buijs, A.; Burckhart, H.; Burgard, C.; Capiluppi, P.; Carnegie, R. K.; Carter, A. A.; Carter, J. R.; Chang, C. Y.; Charlesworth, C.; Charlton, David; Chu, S. L.; Clarke, P. E.L.; Clayton, J. C.; Clowes, S. G.; Cohen, I.; Conboy, J. E.; Coupland, M.; Cuffiani, M.; Dado, S.; Dallapiccola, C.; Dallavalle, G. M.; Darling, C.; Jong, S. J. De; Deng, Hui; Dittmar, M.; Dixit, M. S.; Silva, E. do Couto e; Duboscq, J. E.; Duchovni, E.; Duckeck, G.; Duerdoth, I. P.; Dunwoody, U. C.; Elcombe, P. A.; Estabrooks, P. G.; Etzion, E.; Evans, H.; Fabbri, F.; Fabbro, B.; Fanti, M.; Fierro, M.; Fincke-Keeler, M.; Fischer, H. M.; Fischer, P.; Folman, R.; Fong, D. G.; Foucher, M.; Fukui, H.; Fürtjes, A.; Gagnon, P.; Gaidot, A.; Gary, J. W.; Gascon, J.; Geddes, N. I.; Geich-Gimbel, Ch.; Gensler, S. W.; Gentit, F. X.; Geralis, T.; Giacomelli, G.; Giacomelli, P.; Giacomelli, Roberto; Gibson, V.; Gibson, W. R.; Gillies, J. D.; Goldberg, J.; Gingrich, D. M.; Goodrick, M. J.; Gorn, W.; Grandi, C.; Grannis, P. D.; Gross, E.; Hagemann, J.; Hanson, G.; Hansroul, M.; Hargrove, C. K.; Hart, J. C.; Hart, P. A.; Hauschild, M.; Hawkes, C. M.; Heflin, E.; Hemingway, R. J.; Herten, G.; Heuer, R. D.; Hill, J. C.; Hillier, S. J.; Hilse, T.; Hinshaw, D. A.; Hobson, P. R.; Hochman, D.; Höcker, A.; Homer, R. J.; Honma, A. K.; Hughes-Jones, R. E.; Humbert, R.; Igo‐Kemenes, P.; Ihssen, H.; Imrie, D. C.; Jawahery, A.; Jeffreys, P. W.; Jérémie, H.; Jimack, M.; Jones, M.; Jones, Roger; Jovanović, P.; Jui, C.; Karlen, D.; Kawagoe, K.; Kawamoto, T.; Keeler, R.; Kellogg, R. G.; Kennedy, B. W.; King, B. J.; King, J.; Kluth, S.; Kobayashi, Tatsuo; Kobel, M.; Koetke, D. S.; Kokott, T. P.; Komamiya, S.; Kowalewski, R.; Howard, Robert; Krieger, P.; Krogh, J. von; Kyberd, P.; Lafferty, G. D.; Lafoux, H.; Lahmann, R.; Lauber, J.; Layter, J. G.; Leblanc, P.; Dû, P. Le; Lee, A. M.; Lefebvre, E.; Lehto, M. H.; Lellouch, D.; Leroy, C.; Letts, J.; Levinson, L. J.; Li, Z.; Liu, F.; Lloyd, S. L.; Loebinger, F. K.; Long, G. D.; Lorazo, B.; Losty, M. J.; Lou, X.; Ludwig, J.; Luig, A.; Mannelli, M.; Marcellini, S.; Markus, C.; Martín, A.; Martin, J. P.; Mäshimo, T.; Mättig, P.; Maur, U.; McKenna, J. A.; McMahon, Thomas J.; McNab, A.; McNutt, J. R.; Meijers, F.; Merritt, F. S.; Mes, H.; Michelini, A.; Middleton, R. P.; Mikenberg, G.; Mildenberger, J.; Miller, D. J.; Mir, R.; Mohr, W.; Moisan, C.; Montanari, A.; Mori, T.; Morii, M.; Müller, U.; Nellen, B.; Nijjhar, B.; O’Neale, S. W.; Oakham, F. G.; Odorici, F.; Ogren, H. O.; Oram, C. J.; Oreglia, M. J.; Orito, S.; Pansart, J. P.; Patrick, G. N.; Pearce, M. J.; Pfister, P.; Phillips, P. D.; Pilcher, J. E.; Pinfold, J. L.; Pitman, D.; Plane, D. E.; Poffenberger, P.; Poli, B.; Posthaus, A.; Pritchard, T. W.; Przysiezniak, H.; Redmond, M. W.; Rees, D. L.; Rigby, D.; Rison, M. G.; Robins, S. A.; Robinson, D.; Roney, J. M.; Ros, E.; Rossberg, S.; Rossi, A. M.; Rosvick, M.; Routenburg, P.; Rozen, Y.; Runge, K.; Runólfsson, Ö.; Rust, D. R.; Sasaki, M.; Sbarra, C.; Schaile, A. D.; Schaile, O.; Scharf, F.; Scharff-Hansen, P.; Schenk, P.; Schmitt, B.; Schmitt, H. von der; Schröder, M.; Schultz‐Coulon, H.‐C.; Schütz, P.; Schulz, M.; Schwick, C.; Schwiening, J.; Scott, W. G.; Settles, M.; Shears, T.; Shen, B. C.; Shepherd‐Themistocleous, C. H.; Sherwood, P.; Siroli, G. P.; Skillman, A.; Skuja, A.; Smith, A. M.; Smith, T. J.; Snow, G. A.; Sobie, R.; Springer, R. W.; Sproston, M.; Stahl, A.; Stegmann, C.; Stephens, K.; Steuerer, J.; Stockhausen, B.; Ströhmer, R.; Strom, D.; Szymański, P.; Takeda, Hiroshi; Takeshita, T.; Tarem, S.; Tecchio, M.; Teixeira-Dias, P.; Tesch, N.; Thomson, M. A.; Towers, S.; Tsukamoto, T.; Turner-Watson, M. F.; plas, D. Van den; Kooten, R. Van; Vasseur, G.; Vincter, M. G.; Wagner, A.; Wagner, D. L.; Ward, C. P.; Ward, D. R.; Ward, J. J.; Watkins, P. M.; Watson, A. T.; Watson, N. K.; Weber, P.; Wells, P. S.; Wermes, N.; Wilkens, B.; Wilson, G. W.; Wilson, J. A.; Winterer, V. H.; Włodek, T.; Wolf, G.; Wotton, S. A.; Wyatt, T. R.; Yeaman, A.; Yekutieli, G.; Yurko, M.; Zeuner, W. D.; Zorn, G. T.

doi:10.1016/0370-2693(94)91470-2

Cited by 38 publications

(61 citation statements)

References 29 publications

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“…5 And Department of Experimental Physics, Lajos Kossuth University, Debrecen, Hungary. 6 And MPI München. 7 And Research Institute for Particle and Nuclear Physics, Budapest, Hungary.…”

Section: Introductionmentioning

confidence: 99%

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Search for scalar top and scalar bottom quarks at LEP

Abbiendi¹,

Ainsley²,

Åkesson³

et al. 2002

Physics Letters B

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Searches for a scalar top quark and a scalar bottom quark have been performed using a data sample of 438 pb −1 at centreof-mass energies of √ s = 192-209 GeV collected with the OPAL detector at LEP. No evidence for a signal was found. The 95% confidence level lower limit on the scalar top quark mass is 97.6 GeV if the mixing angle between the supersymmetric partners of the left-and right-handed states of the top quark is zero. When the scalar top quark decouples from the Z 0 boson, the lower limit is 95.7 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 decaying into a bottom quark, a charged lepton and a scalar neutrino has also been studied. The lower limit on the scalar top quark mass is 96.0 GeV for this decay mode, if the mass difference between the scalar top quark and the scalar neutrino is greater than 10 GeV and if the mixing angle of the scalar top quark is zero. From a search for the scalar bottom quark, a mass limit of 96.9 GeV was obtained if the mass difference between the scalar bottom quark and the lightest neutralino is larger than 10 GeV.

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“…5 And Department of Experimental Physics, Lajos Kossuth University, Debrecen, Hungary. 6 And MPI München. 7 And Research Institute for Particle and Nuclear Physics, Budapest, Hungary.…”

Section: Introductionmentioning

confidence: 99%

“…Searches at e + e − colliders are sensitive to smaller mass differences. The first lower limits on thẽ t 1 mass were obtained around the Z 0 peak (LEP1) assumingt 1 → cχ 0 1 [6]. Using part of the higher energy LEP2 data sample, the 95% C.L.…”

Section: Introductionmentioning

confidence: 99%

Search for scalar top and scalar bottom quarks at LEP

Abbiendi¹,

Ainsley²,

Åkesson³

et al. 2002

Physics Letters B

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“…mass limit on the light scalar bottom quark is found to be 88. 6 GeV, assuming that the mass difference between the scalar bottom quark and the lightest neutralino is greater than 7 GeV and that the mixing angle of the scalar bottom quark is zero. If the mass difference is greater than 10 GeV and the lightest neutralino is heavier than 30 GeV, the mass limit on the light scalar bottom quark is 89.8 GeV for zero mixing angle.…”

Section: Discussionmentioning

confidence: 99%

Search for scalar top and scalar bottom quarks at = 189 GeV at LEP

et al. 1999

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“…The reconstruction of B 0 → π + π − decays has been studied with the full detector simulation program BRAHMS, but simulating only the tracking detectors. The candidate selection was based on the OPAL search for this decay [30]. After requiring the direction of the thrust axis to satisfy | cos θ T | < 0.9, jets were reconstructed using a cone algorithm with half-angle 0.65 rad and minimum jet energy 5 GeV.…”

Section: Asymmetry Measurement For π + π −mentioning

confidence: 99%

“…All possible opposite-charge pairs of tracks in each jet were then combined as possible B 0 candidates, requiring the vertex probability to exceed 1 %, the decay length significance L/σ L to exceed 3 and the b hadron candidate energy to exceed 25 GeV. Additionally, the opening angle φ between the two tracks was required to be less than 0.5 and the angle θ * of the π + in the rest frame of the B 0 was required to satisfy |cosθ * | < 0.8 [30]. Finally the reconstructed mass of the candidate was required to be in the range 5.258-5.299 GeV.…”

Section: Asymmetry Measurement For π + π −mentioning

confidence: 99%

Electroweak and CP violation physics at a Linear Collider Z-factory

Hawkings

Mönig²

2000

EPJ direct

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A future linear collider such as TESLA may be able to run on the Z 0 resonance with very high luminosity and polarised electron and positron beams. The possibilities of measuring electroweak quantities with high precision are investigated. Huge improvements with respect to the present precision can be expected, especially for the asymmetries A LR and A b where beam polarisation can be exploited. The very large sample of Z 0 → bb events also allows studies of various CP-violating b decays. The precision achievable on the CKM unitarity triangle angles is comparable to experiments at b factories and future hadron colliders.

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Search for a scalar top quark using the OPAL detector

Cited by 38 publications

References 29 publications

Search for scalar top and scalar bottom quarks at LEP

Search for scalar top and scalar bottom quarks at LEP

Search for scalar top and scalar bottom quarks at = 189 GeV at LEP

Electroweak and CP violation physics at a Linear Collider Z-factory

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