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Search for direct top squark pair production in events with a Z boson, b -jets and missing transverse momentum in √s=8 TeV pp collisions with the ATLAS detector

CollaborationWith : Alexandre, Gauthier / Ancu, Lucian Stefan / Barone, Gaetano / Bell, Paul / Bell, William / Benhar Noccioli, Eleonora / Bilbao De Mendizabal, Javier / Bucci, Francesca / Camacho Toro, Reina / Clark, Allan Geoffrey / Delitzsch, Chris Malena / Della Volpe, Domenico / Doglioni, Caterina / Ferrere, Didier / Gadomski, Szymon / Gonzalez Sevilla, Sergio / Goulette, Marc / Gramling, Johanna Léna / Guescini, Francesco / Iacobucci, Giuseppe / Katre, Akshay / La Rosa, Alessandro / Mermod, Philippe / Miucci, Antonio / Muenstermann, Daniel / Nektarijevic, Snezana / Nikolics, Katalin / Pásztor, G. / Picazio, Attilio / Pohl, Martin / Rosbach, Kilian / Vallecorsa, Sofia / Wu, Xin
Published in European Physical Journal. C. 2014, vol. 74, no. 6, p. 2883
Collection SCOAP3
Abstract A search is presented for direct top squark pair production using events with at least two leptons including a same-flavour opposite-sign pair with invariant mass consistent with the Z boson mass, jets tagged as originating from b -quarks and missing transverse momentum. The analysis is performed with proton–proton collision data at s=8TeV collected with the ATLAS detector at the LHC in 2012 corresponding to an integrated luminosity of 20.3 fb -1 . No excess beyond the Standard Model expectation is observed. Interpretations of the results are provided in models based on the direct pair production of the heavier top squark state ( t~2 ) followed by the decay to the lighter top squark state ( t~1 ) via t~2→Zt~1 , and for t~1 pair production in natural gauge-mediated supersymmetry breaking scenarios where the neutralino ( χ~10 ) is the next-to-lightest supersymmetric particle and decays producing a Z boson and a gravitino ( G~ ) via the χ~10→ZG~ process.
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ATLAS COLLABORATION. Search for direct top squark pair production in events with a Z boson, b -jets and missing transverse momentum in √s=8 TeV pp collisions with the ATLAS detector. In: European Physical Journal. C, 2014, vol. 74, n° 6, p. 2883. https://archive-ouverte.unige.ch/unige:55800

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Deposited on : 2015-04-27

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