Bibcode
Khachatryan, V.; Sirunyan, A. M.; Tumasyan, A.; Adam, W.; Asilar, E.; Bergauer, T.; Brandstetter, J.; Brondolin, E.; Dragicevic, M.; Erö, J.; Flechl, M.; Friedl, M.; Frühwirth, R.; Ghete, V. M.; Hartl, C.; Hörmann, N.; Hrubec, J.; Jeitler, M.; Knünz, V.; König, A.; Krammer, M.; Krätschmer, I.; Liko, D.; Matsushita, T.; Mikulec, I.; Rabady, D.; Rahbaran, B.; Rohringer, H.; Schieck, J.; Schöfbeck, R.; Strauss, J.; Treberer-Treberspurg, W.; Waltenberger, W.; Wulz, C.-E.; Mossolov, V.; Shumeiko, N.; Suarez Gonzalez, J.; Alderweireldt, S.; Cornelis, T.; De Wolf, E. A.; 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.; Moreels, L.; Olbrechts, A.; Python, Q.; Strom, D.; Tavernier, S.; Van Doninck, W.; Van Mulders, P.; Van Onsem, G. P.; Van Parijs, I.; Barria, P.; Brun, H.; Caillol, C.; Clerbaux, B.; De Lentdecker, G.; Fasanella, G.; Favart, L.; Grebenyuk, A.; Karapostoli, G.; Lenzi, T.; Léonard, A.; Maerschalk, T.; Marinov, A.; Perniè, L.; Randle-conde, A.; Reis, T.; Seva, T.; Vander Velde, C.; Vanlaer, P.; Yonamine, R.; Zenoni, F.; Zhang, F.; Beernaert, K.; Benucci, L.; Cimmino, A.; Crucy, S.; Dobur, D.; Fagot, A.; Garcia, G.; Gul, M.; Mccartin, J.; Ocampo Rios, A. A.; Poyraz, D. et al.
Bibliographical reference
Physics Letters B, Volume 759, p. 9-35.
Advertised on:
8
2016
Citations
9
Refereed citations
8
Description
Results are presented from a search for supersymmetric particles in
scenarios with small mass splittings. The data sample corresponds to
19.7 fb-1 of proton-proton collisions recorded by the CMS
experiment at √{ s} = 8 TeV. The search targets top squark (t
˜) pair production in scenarios with mass differences Δm = m
(t ˜) - m (χ˜10) below the W-boson
mass and with top-squark decays in the four-body mode (t ˜ →
bℓν χ˜10), where the neutralino
(χ˜10) is assumed to be the lightest
supersymmetric particle (LSP). The signature includes a high transverse
momentum (pT) jet associated with initial-state radiation,
one or two low-pT leptons, and significant missing transverse
energy. The event yields observed in data are consistent with the
expected background contributions from standard model processes. Limits
are set on the cross section for top squark pair production as a
function of the t ˜ and LSP masses. Assuming a 100% branching
fraction for the four-body decay mode, top-squark masses below 316 GeV
are excluded for Δm = 25 GeV at 95% CL. The dilepton data are also
interpreted under the assumption of chargino-neutralino production, with
subsequent decays to sleptons or sneutrinos. Assuming a difference
between the common
χ˜1+/χ˜20
mass and the LSP mass of 20 GeV and a τ-enriched decay scenario,
masses in the range m (χ ˜1+) < 307
GeV are excluded at 95% CL.