Searches for scalar top, scalar bottom and degenerate scalar quarks have been performed with data collected with the ALEPH detector at LEP. The data sample consists of 57 pb-1 taken at = 181-184 GeV. No evidence for scalar top, scalar bottom or degenerate scalar quarks was found in the channels t~-->cχ, t~-->blν~, b~-->bχ, and q~-->qχ. From the channel t~-->cχ a limit of 74 GeV/c2 has been set on the scalar top quark mass, independent of the mixing angle. This limit assumes a mass difference between the t~ and the χ in the range 10-40 GeV/c2. From the channel t~-->blν~ the mixing-angle-independent scalar top limit is 82 GeV/c2, assuming mt~-mν~ > 10 GeV/c2. From the channel b~-->bχ, a limit of 79 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 for mb~-mχ > 10 GeV/c2. From the channel q~-->qχ, a limit of 87 GeV/c2 has been set on the mass of supersymmetric partners of light quarks assuming five degenerate flavours and the production of both ``left-handed'' and ``right-handed'' squarks. This limit is valid for mq~-mχ > 5 GeV/c2.

Scalar quark searches in e+e− collisions at GeV / R., B., D., B., D., D., P., G., C., G., S., J., J. P., L., A., L., F., M., E., M., M. N., M., J. Y., N., B., P., R., A., G., B., M. P., C., M., C., J. M., C., M., D., E., F., et al.. - In: PHYSICS LETTERS. SECTION B. - ISSN 0370-2693. - STAMPA. - 434:(1998), pp. 189-199. [10.1016/S0370-2693(98)00662-5]

Scalar quark searches in e+e− collisions at GeV

GREGORIO, ANNA;GIANNINI, GIANROSSANO;
1998-01-01

Abstract

Searches for scalar top, scalar bottom and degenerate scalar quarks have been performed with data collected with the ALEPH detector at LEP. The data sample consists of 57 pb-1 taken at = 181-184 GeV. No evidence for scalar top, scalar bottom or degenerate scalar quarks was found in the channels t~-->cχ, t~-->blν~, b~-->bχ, and q~-->qχ. From the channel t~-->cχ a limit of 74 GeV/c2 has been set on the scalar top quark mass, independent of the mixing angle. This limit assumes a mass difference between the t~ and the χ in the range 10-40 GeV/c2. From the channel t~-->blν~ the mixing-angle-independent scalar top limit is 82 GeV/c2, assuming mt~-mν~ > 10 GeV/c2. From the channel b~-->bχ, a limit of 79 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 for mb~-mχ > 10 GeV/c2. From the channel q~-->qχ, a limit of 87 GeV/c2 has been set on the mass of supersymmetric partners of light quarks assuming five degenerate flavours and the production of both ``left-handed'' and ``right-handed'' squarks. This limit is valid for mq~-mχ > 5 GeV/c2.
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11368/2561078
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