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Search for top squark pair production in compressed-mass-spectrum scenarios in proton-proton collisions at s=8 TeV using the αT variable

Author(s): Khachatryan, V; Sirunyan, AM; Tumasyan, A; Adam, W; Asilar, E; et al

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Abstract: © 2017 The AuthorAn inclusive search is performed for supersymmetry in final states containing jets and an apparent imbalance in transverse momentum, p→Tmiss, due to the production of unobserved weakly interacting particles in pp collisions at a centre-of-mass energy of 8 TeV. The data, recorded with the CMS detector at the CERN LHC, correspond to an integrated luminosity of 18.5 fb−1. The dimensionless kinematic variable αT is used to discriminate between events with genuine p→Tmiss associated with unobserved particles and spurious values of p→Tmiss arising from jet energy mismeasurements. No excess of event yields above the expected standard model backgrounds is observed. The results are interpreted in terms of constraints on the parameter space of several simplified models of supersymmetry that assume the pair production of top squarks. The search provides sensitivity to a broad range of top squark (t˜) decay modes, including the two-body decay t˜→cχ˜1°, where c is a charm quark and χ˜1° is the lightest neutralino, as well as the four-body decay t˜→bff¯′χ˜1°, where b is a bottom quark and f and f¯′ are fermions produced in the decay of an intermediate off-shell W boson. These modes dominate in scenarios in which the top squark and lightest neutralino are nearly degenerate in mass. For these modes, top squarks with masses as large as 260 and 225 GeV are excluded, respectively, for the two- and four-body decays.
Publication Date: 10-Apr-2017
Electronic Publication Date: 10-Feb-2017
Citation: Khachatryan, V, Sirunyan, AM, Tumasyan, A, Adam, W, Asilar, E, Bergauer, T, Brandstetter, J, Brondolin, E, Dragicevic, M, Erö, J, Flechl, M, Friedl, M, Frühwirth, R, Ghete, VM, Hartl, C, Hörmann, N, Hrubec, J, Jeitler, M, König, A, Krammer, M, Krätschmer, I, Liko, D, Matsushita, T, Mikulec, I, Rabady, D, Rad, N, Rahbaran, B, Rohringer, H, Schieck, J, Strauss, J, Treberer-Treberspurg, W, Waltenberger, W, Wulz, CE, Mossolov, V, Shumeiko, N, Suarez Gonzalez, J, Alderweireldt, S, Cornelis, T, De Wolf, EA, Janssen, X, Knutsson, A, Lauwers, J, Luyckx, S, Van De Klundert, M, Van Haevermaet, H, Van Mechelen, P, Van Remortel, N, Van Spilbeeck, A, Abu Zeid, S, Blekman, F, D'Hondt, J, Daci, N, De Bruyn, I, Deroover, K, Heracleous, N, Keaveney, J, Lowette, S, Moortgat, S, Moreels, L, Olbrechts, A, Python, Q, Strom, D, Tavernier, S, Van Doninck, W, Van Mulders, P, Van Parijs, I, Brun, H, Caillol, C, Clerbaux, B, De Lentdecker, G, Fasanella, G, Favart, L, Goldouzian, R, Grebenyuk, A, Karapostoli, G, Lenzi, T, Léonard, A, Maerschalk, T, Marinov, A, Randle-conde, A, Seva, T, Vander Velde, C, Vanlaer, P, Yonamine, R, Zenoni, F, Zhang, F, Benucci, L, Cimmino, A, Crucy, S, Dobur, D, Fagot, A, Garcia, G, Gul, M, Mccartin, J, Ocampo Rios, AA, Poyraz, D, Ryckbosch, D, Salva, S, Schöfbeck, R, Sigamani, M. (2017). Search for top squark pair production in compressed-mass-spectrum scenarios in proton-proton collisions at s=8 TeV using the α<inf>T</inf> variable. Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics, 767 (403 - 430. doi:10.1016/j.physletb.2017.02.007
DOI: doi:10.1016/j.physletb.2017.02.007
ISSN: 0370-2693
Pages: 403 - 430
Type of Material: Journal Article
Journal/Proceeding Title: Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
Version: Final published version. This is an open access article.

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