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 root s = 161, 170, and 172 GeV and 5.7 pb(-1) taken at root s = 130 and 136 GeV. No evidence for scalar top quarks or scalar bottom quarks was found in the channels (t) over tilde --> c chi, (t) over tilde --> bl<(nu)over tilde>, and (b) over tilde --> b chi. For the channel (t) over tilde --> c chi a limit of 67 GeV/c(2) 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) over tilde and the chi of at least 10 GeV/c(2). For the channel (t) over tilde --> bl<(nu)over tilde> the mixing-angle independent scalar top limit is 70 GeV/c(2), assuming a mass difference between the (t) over tilde and the <(nu)over tilde> of at least 10 GeV/c(2). For the channel (b) over tilde --> b chi, a limit of 73 GeV/c(2) 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) over tilde and the chi is at least 10 GeV/c(2).

Searches for scalar top and scalar bottom quarks at LEP2 / 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, L., Juste, A., Martinez, M., et al.. - In: PHYSICS LETTERS. SECTION B. - ISSN 0370-2693. - STAMPA. - 413:3-4(1997), pp. 431-446. [10.1016/S0370-2693(97)01178-7]

Searches for scalar top and scalar bottom quarks at LEP2

CREANZA, Donato Maria;IASELLI, Giuseppe;MAGGI, Giorgio Pietro;
1997

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 root s = 161, 170, and 172 GeV and 5.7 pb(-1) taken at root s = 130 and 136 GeV. No evidence for scalar top quarks or scalar bottom quarks was found in the channels (t) over tilde --> c chi, (t) over tilde --> bl<(nu)over tilde>, and (b) over tilde --> b chi. For the channel (t) over tilde --> c chi a limit of 67 GeV/c(2) 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) over tilde and the chi of at least 10 GeV/c(2). For the channel (t) over tilde --> bl<(nu)over tilde> the mixing-angle independent scalar top limit is 70 GeV/c(2), assuming a mass difference between the (t) over tilde and the <(nu)over tilde> of at least 10 GeV/c(2). For the channel (b) over tilde --> b chi, a limit of 73 GeV/c(2) 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) over tilde and the chi is at least 10 GeV/c(2).
1997
Searches for scalar top and scalar bottom quarks at LEP2 / 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, L., Juste, A., Martinez, M., et al.. - In: PHYSICS LETTERS. SECTION B. - ISSN 0370-2693. - STAMPA. - 413:3-4(1997), pp. 431-446. [10.1016/S0370-2693(97)01178-7]
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11589/4061
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