Searches for scalar top and scalar bottom quarks at LEP2

R. Barate; D. Buskulic; D. Decamp; P. Ghez; C. Goy; J. P. Lees; A. Lucotte; M. N. Minard; J. Y. Nief; B. Pietrzyk; M. P. Casado; M. Chmeissani; P. Comas; J. M. Crespo; M. Delfino; E. Fernandez; M. Fernandez-Bosman; LI Garrido; A. Juste; M. Martinez; G. Merino; R. Miquel; L. M. Mir; C. Padilla; I. C. Park; A. Pascual; J. A. Perlas; I. Riu; F. Sanchez; F. Teubert; A. Colaleo; D. Creanza; M. de Palma; G. Gelao; G. Iaselli; G. Maggi; M. Maggi; N. Marinelli; S. Nuzzo; A. Ranieri; G. Raso; F. Ruggieri; G. Selvaggi; L. Silvestris; P. Tempesta; A. Tricomi; G. Zito; X. Huang; J. Lin; Q. Ouyang; T. Wang; Y. Xie; R. Xu; S. Xue; J. Zhang; L. Zhang; W. Zhao; D. Abbaneo; R. Alemany; A. O. Bazarko; U. Becker; P. Bright-Thomas; M. Cattaneo; F. Cerutti; G. Dissertori; H. Drevermann; R. W. Forty; M. Frank; R. Hagelberg; J. B. Hansen; J. Harvey; P. Janot; B. Jost; E. Kneringer; J. Knobloch; I. Lehraus; P. Mato; A. Minten; L. Moneta; A. Pacheco; J. F. Pusztaszeri; F. Ranjard; G. Rizzo; L. Rolandi; D. Rousseau; D. Schlatter; M. Schmitt; O. Schneider; W. Tejessy; I. R. Tomalin; H. Wachsmuth; A. Wagner; Z. Ajaltouni; A. Barrès; C. Boyer; A. Falvard; C. Ferdi; P. Gay; C. Guicheney; P. Henrard

doi:10.1016/S0370-2693(97)01178-7

Searches for scalar top and scalar bottom quarks at LEP2

R. Barate, D. Buskulic, D. Decamp, P. Ghez, C. Goy, J. P. Lees, A. Lucotte, M. N. Minard, J. Y. Nief, B. Pietrzyk, M. P. Casado, M. Chmeissani, P. Comas, J. M. Crespo, M. Delfino, E. Fernandez, M. Fernandez-Bosman, LI Garrido, A. Juste, M. MartinezG. Merino, R. Miquel, L. M. Mir, C. Padilla, I. C. Park, A. Pascual, J. A. Perlas, I. Riu, F. Sanchez, F. Teubert, A. Colaleo, D. Creanza, M. de Palma, G. Gelao, G. Iaselli, G. Maggi, M. Maggi, N. Marinelli, S. Nuzzo, A. Ranieri, G. Raso, F. Ruggieri, G. Selvaggi, L. Silvestris, P. Tempesta, A. Tricomi, G. Zito, X. Huang, J. Lin, Q. Ouyang, T. Wang, Y. Xie, R. Xu, S. Xue, J. Zhang, L. Zhang, W. Zhao, D. Abbaneo, R. Alemany, A. O. Bazarko, U. Becker, P. Bright-Thomas, M. Cattaneo, F. Cerutti, G. Dissertori, H. Drevermann, R. W. Forty, M. Frank, R. Hagelberg, J. B. Hansen, J. Harvey, P. Janot, B. Jost, E. Kneringer, J. Knobloch, I. Lehraus, P. Mato, A. Minten, L. Moneta, A. Pacheco, J. F. Pusztaszeri, F. Ranjard, G. Rizzo, L. Rolandi, D. Rousseau, D. Schlatter, M. Schmitt, O. Schneider, W. Tejessy, I. R. Tomalin, H. Wachsmuth, A. Wagner, Z. Ajaltouni, A. Barrès, C. Boyer, A. Falvard, C. Ferdi, P. Gay, C. Guicheney, P. Henrard

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Abstract

Searches for scalar top and bottom quarks have been performed with data collected by the ALEPH detector at LEP. The data sample consists of 21.7 pb-1 taken at √s = 161, 170, and 172 GeV and 5.7 pb-1 taken at √s = 130 and 136 GeV. No evidence for scalar top quarks or scalar bottom quarks was found in the channels t̃ → c χ, t̃ → bℓṽ, and b̃ → bχ. For the channel t̃ → c χ a limit of 67 GeV/c2 has been set on the scalar top quark mass, independent of the mixing angle between the supersymmetric partners of the left and right-handed states of the top quark. This limit assumes a mass difference between the t̃ and the χ of at least 10 GeV/c2. For the channel χ → bℓṽ the mixing-angle independent scalar top limit is 70 GeV/c2, assuming a mass difference between the t̄ and the ṽ of at least 10 GeV/c2. For the channel b̄ →bχ, a limit of 73 GeV/c2 has been set on the mass of the supersymmetric partner of the left-handed state of the bottom quark. This limit is valid if the mass difference between the b̃ and the χ is at least 10 GeV/c2. © 1997 Elsevier Science B.V.

Original language	English
Pages (from-to)	431-446
Journal	Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
Volume	413
DOIs	https://doi.org/10.1016/S0370-2693(97)01178-7
Publication status	Published - 13 Nov 1997

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10.1016/S0370-2693(97)01178-7

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Barate, R., Buskulic, D., Decamp, D., Ghez, P., Goy, C., Lees, J. P., Lucotte, A., Minard, M. N., Nief, J. Y., Pietrzyk, B., Casado, M. P., Chmeissani, M., Comas, P., Crespo, J. M., Delfino, M., Fernandez, E., Fernandez-Bosman, M., Garrido, LI., Juste, A., ... Henrard, P. (1997). Searches for scalar top and scalar bottom quarks at LEP2. Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics, 413, 431-446. https://doi.org/10.1016/S0370-2693(97)01178-7

@article{99a73cbcef924a99b6b0eb99b1b94c4b,

title = "Searches for scalar top and scalar bottom quarks at LEP2",

abstract = "Searches for scalar top and bottom quarks have been performed with data collected by the ALEPH detector at LEP. The data sample consists of 21.7 pb-1 taken at √s = 161, 170, and 172 GeV and 5.7 pb-1 taken at √s = 130 and 136 GeV. No evidence for scalar top quarks or scalar bottom quarks was found in the channels {\~t} → c χ, {\~t} → bℓṽ, and {\~b} → bχ. For the channel {\~t} → c χ a limit of 67 GeV/c2 has been set on the scalar top quark mass, independent of the mixing angle between the supersymmetric partners of the left and right-handed states of the top quark. This limit assumes a mass difference between the {\~t} and the χ of at least 10 GeV/c2. For the channel χ → bℓṽ the mixing-angle independent scalar top limit is 70 GeV/c2, assuming a mass difference between the {\=t} and the ṽ of at least 10 GeV/c2. For the channel {\=b} →bχ, a limit of 73 GeV/c2 has been set on the mass of the supersymmetric partner of the left-handed state of the bottom quark. This limit is valid if the mass difference between the {\~b} and the χ is at least 10 GeV/c2. {\textcopyright} 1997 Elsevier Science B.V.",

author = "R. Barate and D. Buskulic and D. Decamp and P. Ghez and C. Goy and Lees, {J. P.} and A. Lucotte and Minard, {M. N.} and Nief, {J. Y.} and B. Pietrzyk and Casado, {M. P.} and M. Chmeissani and P. Comas and Crespo, {J. M.} and M. Delfino and E. Fernandez and M. Fernandez-Bosman and LI Garrido and A. Juste and M. Martinez and G. Merino and R. Miquel and Mir, {L. M.} and C. Padilla and Park, {I. C.} and A. Pascual and Perlas, {J. A.} and I. Riu and F. Sanchez and F. Teubert and A. Colaleo and D. Creanza and {de Palma}, M. and G. Gelao and G. Iaselli and G. Maggi and M. Maggi and N. Marinelli and S. Nuzzo and A. Ranieri and G. Raso and F. Ruggieri and G. Selvaggi and L. Silvestris and P. Tempesta and A. Tricomi and G. Zito and X. Huang and J. Lin and Q. Ouyang and T. Wang and Y. Xie and R. Xu and S. Xue and J. Zhang and L. Zhang and W. Zhao and D. Abbaneo and R. Alemany and Bazarko, {A. O.} and U. Becker and P. Bright-Thomas and M. Cattaneo and F. Cerutti and G. Dissertori and H. Drevermann and Forty, {R. W.} and M. Frank and R. Hagelberg and Hansen, {J. B.} and J. Harvey and P. Janot and B. Jost and E. Kneringer and J. Knobloch and I. Lehraus and P. Mato and A. Minten and L. Moneta and A. Pacheco and Pusztaszeri, {J. F.} and F. Ranjard and G. Rizzo and L. Rolandi and D. Rousseau and D. Schlatter and M. Schmitt and O. Schneider and W. Tejessy and Tomalin, {I. R.} and H. Wachsmuth and A. Wagner and Z. Ajaltouni and A. Barr{\`e}s and C. Boyer and A. Falvard and C. Ferdi and P. Gay and C. Guicheney and P. Henrard",

year = "1997",

month = nov,

day = "13",

doi = "10.1016/S0370-2693(97)01178-7",

language = "English",

volume = "413",

pages = "431--446",

journal = "Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics",

issn = "0370-2693",

publisher = "Elsevier",

}

Barate, R, Buskulic, D, Decamp, D, Ghez, P, Goy, C, Lees, JP, Lucotte, A, Minard, MN, Nief, JY, Pietrzyk, B, Casado, MP, Chmeissani, M, Comas, P, Crespo, JM , Delfino, M , Fernandez, E, Fernandez-Bosman, M, Garrido, LI, Juste, A, Martinez, M, Merino, G, Miquel, R, Mir, LM, Padilla, C, Park, IC, Pascual, A, Perlas, JA, Riu, I, Sanchez, F, Teubert, F, Colaleo, A, Creanza, D, de Palma, M, Gelao, G, Iaselli, G, Maggi, G, Maggi, M, Marinelli, N, Nuzzo, S, Ranieri, A, Raso, G, Ruggieri, F, Selvaggi, G, Silvestris, L, Tempesta, P, Tricomi, A, Zito, G, Huang, X, Lin, J, Ouyang, Q, Wang, T, Xie, Y, Xu, R, Xue, S, Zhang, J, Zhang, L, Zhao, W, Abbaneo, D, Alemany, R, Bazarko, AO, Becker, U, Bright-Thomas, P, Cattaneo, M, Cerutti, F, Dissertori, G, Drevermann, H, Forty, RW, Frank, M, Hagelberg, R, Hansen, JB, Harvey, J, Janot, P, Jost, B, Kneringer, E, Knobloch, J, Lehraus, I, Mato, P, Minten, A, Moneta, L, Pacheco, A, Pusztaszeri, JF, Ranjard, F, Rizzo, G, Rolandi, L, Rousseau, D, Schlatter, D, Schmitt, M, Schneider, O, Tejessy, W, Tomalin, IR, Wachsmuth, H, Wagner, A, Ajaltouni, Z, Barrès, A, Boyer, C, Falvard, A, Ferdi, C, Gay, P, Guicheney, C & Henrard, P 1997, 'Searches for scalar top and scalar bottom quarks at LEP2', Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics, vol. 413, pp. 431-446. https://doi.org/10.1016/S0370-2693(97)01178-7

TY - JOUR

T1 - Searches for scalar top and scalar bottom quarks at LEP2

AU - Barate, R.

AU - Buskulic, D.

AU - Decamp, D.

AU - Ghez, P.

AU - Goy, C.

AU - Lees, J. P.

AU - Lucotte, A.

AU - Minard, M. N.

AU - Nief, J. Y.

AU - Pietrzyk, B.

AU - Casado, M. P.

AU - Chmeissani, M.

AU - Comas, P.

AU - Crespo, J. M.

AU - Delfino, M.

AU - Fernandez, E.

AU - Fernandez-Bosman, M.

AU - Garrido, LI

AU - Juste, A.

AU - Martinez, M.

AU - Merino, G.

AU - Miquel, R.

AU - Mir, L. M.

AU - Padilla, C.

AU - Park, I. C.

AU - Pascual, A.

AU - Perlas, J. A.

AU - Riu, I.

AU - Sanchez, F.

AU - Teubert, F.

AU - Colaleo, A.

AU - Creanza, D.

AU - de Palma, M.

AU - Gelao, G.

AU - Iaselli, G.

AU - Maggi, G.

AU - Maggi, M.

AU - Marinelli, N.

AU - Nuzzo, S.

AU - Ranieri, A.

AU - Raso, G.

AU - Ruggieri, F.

AU - Selvaggi, G.

AU - Silvestris, L.

AU - Tempesta, P.

AU - Tricomi, A.

AU - Zito, G.

AU - Huang, X.

AU - Lin, J.

AU - Ouyang, Q.

AU - Wang, T.

AU - Xie, Y.

AU - Xu, R.

AU - Xue, S.

AU - Zhang, J.

AU - Zhang, L.

AU - Zhao, W.

AU - Abbaneo, D.

AU - Alemany, R.

AU - Bazarko, A. O.

AU - Becker, U.

AU - Bright-Thomas, P.

AU - Cattaneo, M.

AU - Cerutti, F.

AU - Dissertori, G.

AU - Drevermann, H.

AU - Forty, R. W.

AU - Frank, M.

AU - Hagelberg, R.

AU - Hansen, J. B.

AU - Harvey, J.

AU - Janot, P.

AU - Jost, B.

AU - Kneringer, E.

AU - Knobloch, J.

AU - Lehraus, I.

AU - Mato, P.

AU - Minten, A.

AU - Moneta, L.

AU - Pacheco, A.

AU - Pusztaszeri, J. F.

AU - Ranjard, F.

AU - Rizzo, G.

AU - Rolandi, L.

AU - Rousseau, D.

AU - Schlatter, D.

AU - Schmitt, M.

AU - Schneider, O.

AU - Tejessy, W.

AU - Tomalin, I. R.

AU - Wachsmuth, H.

AU - Wagner, A.

AU - Ajaltouni, Z.

AU - Barrès, A.

AU - Boyer, C.

AU - Falvard, A.

AU - Ferdi, C.

AU - Gay, P.

AU - Guicheney, C.

AU - Henrard, P.

PY - 1997/11/13

Y1 - 1997/11/13

N2 - Searches for scalar top and bottom quarks have been performed with data collected by the ALEPH detector at LEP. The data sample consists of 21.7 pb-1 taken at √s = 161, 170, and 172 GeV and 5.7 pb-1 taken at √s = 130 and 136 GeV. No evidence for scalar top quarks or scalar bottom quarks was found in the channels t̃ → c χ, t̃ → bℓṽ, and b̃ → bχ. For the channel t̃ → c χ a limit of 67 GeV/c2 has been set on the scalar top quark mass, independent of the mixing angle between the supersymmetric partners of the left and right-handed states of the top quark. This limit assumes a mass difference between the t̃ and the χ of at least 10 GeV/c2. For the channel χ → bℓṽ the mixing-angle independent scalar top limit is 70 GeV/c2, assuming a mass difference between the t̄ and the ṽ of at least 10 GeV/c2. For the channel b̄ →bχ, a limit of 73 GeV/c2 has been set on the mass of the supersymmetric partner of the left-handed state of the bottom quark. This limit is valid if the mass difference between the b̃ and the χ is at least 10 GeV/c2. © 1997 Elsevier Science B.V.

AB - Searches for scalar top and bottom quarks have been performed with data collected by the ALEPH detector at LEP. The data sample consists of 21.7 pb-1 taken at √s = 161, 170, and 172 GeV and 5.7 pb-1 taken at √s = 130 and 136 GeV. No evidence for scalar top quarks or scalar bottom quarks was found in the channels t̃ → c χ, t̃ → bℓṽ, and b̃ → bχ. For the channel t̃ → c χ a limit of 67 GeV/c2 has been set on the scalar top quark mass, independent of the mixing angle between the supersymmetric partners of the left and right-handed states of the top quark. This limit assumes a mass difference between the t̃ and the χ of at least 10 GeV/c2. For the channel χ → bℓṽ the mixing-angle independent scalar top limit is 70 GeV/c2, assuming a mass difference between the t̄ and the ṽ of at least 10 GeV/c2. For the channel b̄ →bχ, a limit of 73 GeV/c2 has been set on the mass of the supersymmetric partner of the left-handed state of the bottom quark. This limit is valid if the mass difference between the b̃ and the χ is at least 10 GeV/c2. © 1997 Elsevier Science B.V.

U2 - 10.1016/S0370-2693(97)01178-7

DO - 10.1016/S0370-2693(97)01178-7

M3 - Article

SN - 0370-2693

VL - 413

SP - 431

EP - 446

JO - Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics

JF - Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics

ER -

Searches for scalar top and scalar bottom quarks at LEP2

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