Bibcode
Sirunyan, A. M.; Tumasyan, A.; Adam, W.; Ambrogi, F.; Asilar, E.; Bergauer, T.; Brandstetter, J.; Brondolin, E.; Dragicevic, M.; Erö, J.; Flechl, M.; Friedl, M.; Frühwirth, R.; Ghete, V. M.; Grossmann, J.; Hrubec, J.; Jeitler, M.; König, A.; Krammer, N.; Krätschmer, I.; Liko, D.; Madlener, T.; Mikulec, I.; Pree, E.; Rad, N.; Rohringer, H.; Schieck, J.; Schöfbeck, R.; Spanring, M.; Spitzbart, D.; Waltenberger, W.; Wittmann, J.; Wulz, C.-E.; Zarucki, M.; Chekhovsky, V.; Mossolov, V.; Suarez Gonzalez, J.; De Wolf, E. A.; Di Croce, D.; Janssen, X.; Lauwers, J.; Van De Klundert, M.; Van Haevermaet, H.; Van Mechelen, P.; Van Remortel, N.; Abu Zeid, S.; Blekman, F.; D'Hondt, J.; De Bruyn, I.; De Clercq, J.; Deroover, K.; Flouris, G.; Lontkovskyi, D.; Lowette, S.; Marchesini, I.; Moortgat, S.; Moreels, L.; Python, Q.; Skovpen, K.; Tavernier, S.; Van Doninck, W.; Van Mulders, P.; Van Parijs, I.; Beghin, D.; Brun, H.; Clerbaux, B.; De Lentdecker, G.; Delannoy, H.; Dorney, B.; Fasanella, G.; Favart, L.; Goldouzian, R.; Grebenyuk, A.; Lenzi, T.; Luetic, J.; Maerschalk, T.; Marinov, A.; Seva, T.; Starling, E.; Vander Velde, C.; Vanlaer, P.; Vannerom, D.; Yonamine, R.; Zenoni, F.; Zhang, F.; Cimmino, A.; Cornelis, T.; Dobur, D.; Fagot, A.; Gul, M.; Khvastunov, I.; Poyraz, D.; Roskas, C.; Salva, S.; Tytgat, M.; Verbeke, W.; Zaganidis, N.; Bakhshiansohi, H.; Bondu, O.; Brochet, S. et al.
Referencia bibliográfica
Physical Review D, Volume 97, Issue 3, id.032009
Fecha de publicación:
2
2018
Revista
Número de citas
35
Número de citas referidas
34
Descripción
A search for new physics is presented in final states with two
oppositely charged leptons (electrons or muons), jets identified as
originating from b quarks, and missing transverse momentum
(pTmiss). The search uses proton-proton collision
data at √{s }=13 TeV amounting to 35.9 fb-1 of
integrated luminosity collected using the CMS detector in 2016.
Hypothetical signal events are efficiently separated from the dominant t
t ¯ background with requirements on pTmiss
and transverse-mass variables. No significant deviation is observed from
the expected background. Exclusion limits are set in the context of
simplified supersymmetric models with pair-produced top squarks. For top
squarks, decaying exclusively to a top quark and a neutralino, exclusion
limits are placed at 95% confidence level on the mass of the lightest
top squark up to 800 GeV and on the lightest neutralino up to 360 GeV.
These results, combined with searches in the single-lepton and all-jet
final states, raise the exclusion limits up to 1050 GeV for the lightest
top squark and up to 500 GeV for the lightest neutralino. For top
squarks undergoing a cascade decay through charginos and sleptons, the
mass limits reach up to 1300 GeV for top squarks and up to 800 GeV for
the lightest neutralino. The results are also interpreted in a
simplified model with a dark matter (DM) particle coupled to the top
quark through a scalar or pseudoscalar mediator. For light DM, mediator
masses up to 100 (50) GeV are excluded for scalar (pseudoscalar)
mediators. The result for the scalar mediator achieves some of the most
stringent limits to date in this model.