ATLAS Run 1 searches for direct pair production of third-generation squarks at the Large Hadron Collider

Aad, G. and Abbott, B. and Abdallah, J. and Abdinov, O. and Aben, R. and Krasznahorkay, Attila and Nagai, Yoshikazu and Pásztor, Gabriella and Tóth, József (2015) ATLAS Run 1 searches for direct pair production of third-generation squarks at the Large Hadron Collider. EUROPEAN PHYSICAL JOURNAL C, 75 (10). ISSN 1434-6044

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Abstract

This paper reviews and extends searches for the direct pair production of the scalar super- symmetric partners of the top and bottom quarks in proton–proton collisions collected by the ATLAS collaboration during the LHC Run 1. Most of the analyses use 20 fb−1 of collisions at a centre-of-mass energy of √s = 8 TeV, although in some case an additional 4.7 fb−1 of collision data at √s = 7 TeV are used. New analyses are introduced to improve the sensitiv- ity to specific regions of the model parameter space. Since no evidence of third-generation squarks is found, exclusion limits are derived by combining several analyses and are presen- ted in both a simplified model framework, assuming simple decay chains, as well as within the context of more elaborate phenomenological supersymmetric models.

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