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

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Search for scalar top and scalar bottom quarks at √s = 189 GeV at LEP. / OPAL Collaboration.
In: Physics Letters B, Vol. 456, No. 1, 03.06.1999, p. 95-106.

Research output: Contribution to Journal/Magazine › Journal article › peer-review

Harvard

OPAL Collaboration 1999, 'Search for scalar top and scalar bottom quarks at √s = 189 GeV at LEP', Physics Letters B, vol. 456, no. 1, pp. 95-106. https://doi.org/10.1016/S0370-2693(99)00440-2

APA

OPAL Collaboration (1999). Search for scalar top and scalar bottom quarks at √s = 189 GeV at LEP. Physics Letters B, 456(1), 95-106. https://doi.org/10.1016/S0370-2693(99)00440-2

Vancouver

OPAL Collaboration. Search for scalar top and scalar bottom quarks at √s = 189 GeV at LEP. Physics Letters B. 1999 Jun 3;456(1):95-106. doi: 10.1016/S0370-2693(99)00440-2

Author

OPAL Collaboration. / Search for scalar top and scalar bottom quarks at √s = 189 GeV at LEP. In: Physics Letters B. 1999 ; Vol. 456, No. 1. pp. 95-106.

Bibtex

@article{8fa3c4f4d3f14939a57158094344ff59,
title = "Search for scalar top and scalar bottom quarks at √s = 189 GeV at LEP",
abstract = "Searches for a scalar top quark and a scalar bottom quark have been performed using a data sample of 182 pb−1 at a centre-of-mass energy of Full-size image (<1 K)189 GeV collected with the OPAL detector at LEP. No evidence for a signal was found. The 95% confidence level (C.L.) lower limit on the scalar top quark mass is 90.3 GeV if the mixing angle between the supersymmetric partners of the left- and right-handed states of the top quark is zero. In the worst case, when the scalar top quark decouples from the Z0 boson, the lower limit is 87.2 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. From a search for the scalar bottom quark, a mass limit of 88.6 GeV was obtained if the mass difference between the scalar bottom quark and the lightest neutralino is larger than 7 GeV. These limits significantly improve the previous OPAL limits.",
author = "Vakhtang Kartvelishvili and {OPAL Collaboration}",
year = "1999",
month = jun,
day = "3",
doi = "10.1016/S0370-2693(99)00440-2",
language = "English",
volume = "456",
pages = "95--106",
journal = "Physics Letters B",
issn = "0370-2693",
publisher = "ELSEVIER SCIENCE BV",
number = "1",

}

RIS

TY - JOUR

T1 - Search for scalar top and scalar bottom quarks at √s = 189 GeV at LEP

AU - Kartvelishvili, Vakhtang

AU - OPAL Collaboration

PY - 1999/6/3

Y1 - 1999/6/3

N2 - Searches for a scalar top quark and a scalar bottom quark have been performed using a data sample of 182 pb−1 at a centre-of-mass energy of Full-size image (<1 K)189 GeV collected with the OPAL detector at LEP. No evidence for a signal was found. The 95% confidence level (C.L.) lower limit on the scalar top quark mass is 90.3 GeV if the mixing angle between the supersymmetric partners of the left- and right-handed states of the top quark is zero. In the worst case, when the scalar top quark decouples from the Z0 boson, the lower limit is 87.2 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. From a search for the scalar bottom quark, a mass limit of 88.6 GeV was obtained if the mass difference between the scalar bottom quark and the lightest neutralino is larger than 7 GeV. These limits significantly improve the previous OPAL limits.

AB - Searches for a scalar top quark and a scalar bottom quark have been performed using a data sample of 182 pb−1 at a centre-of-mass energy of Full-size image (<1 K)189 GeV collected with the OPAL detector at LEP. No evidence for a signal was found. The 95% confidence level (C.L.) lower limit on the scalar top quark mass is 90.3 GeV if the mixing angle between the supersymmetric partners of the left- and right-handed states of the top quark is zero. In the worst case, when the scalar top quark decouples from the Z0 boson, the lower limit is 87.2 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. From a search for the scalar bottom quark, a mass limit of 88.6 GeV was obtained if the mass difference between the scalar bottom quark and the lightest neutralino is larger than 7 GeV. These limits significantly improve the previous OPAL limits.

U2 - 10.1016/S0370-2693(99)00440-2

DO - 10.1016/S0370-2693(99)00440-2

M3 - Journal article

VL - 456

SP - 95

EP - 106

JO - Physics Letters B

JF - Physics Letters B

SN - 0370-2693

IS - 1

ER -