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Title

Search for supersymmetry in events with b -tagged jets and missing transverse momentum in pp collisions at √s = 13 TeV with the ATLAS detector

CollaborationWith : Akilli, Ece / Ancu, Lucian Stefan / Benoit, Mathieu / Calace, Noemi / Clark, Allan Geoffrey / Coccaro, Andrea / Della Volpe, Domenico / Di Bello, Francesco / Dubreuil, Arnaud / Ferrere, Didier / Golling, Tobias / Gonzalez Sevilla, Sergio / Iacobucci, Giuseppe / Jansky, Roland / Katre, Akshay / Khoo, Teng Jian / Lanfermann, Marie Christine / Lionti, Anthony Eric / March Ruiz, Luis / Mermod, Philippe / Nackenhorst, Olaf / Nessi, Marzio / Paolozzi, Lorenzo / Schramm, Steven / Sfyrla, Anna / Valente, Marco / Wu, Xin
Published in Journal of High Energy Physics. 2017, vol. 1711, p. 195-245
Collection Open Access - SCOAP3
Abstract A search for the supersymmetric partners of the Standard Model bottom and top quarks is presented. The search uses 36.1 fb −1 of pp collision data at √s = 13 TeV collected by the ATLAS experiment at the Large Hadron Collider. Direct production of pairs of bottom and top squarks ( b ¯ 1 $$ {\overline{b}}_1 $$ and t ¯ 1 $$ {\overline{t}}_1 $$ ) is searched for in final states with b -tagged jets and missing transverse momentum. Distinctive selections are defined with either no charged leptons (electrons or muons) in the final state, or one charged lepton. The zero-lepton selection targets models in which the b ¯ 1 $$ {\overline{b}}_1 $$ is the lightest squark and decays via b ¯ 1 → b χ ¯ 1 0 $$ {\overline{b}}_1\to b{\overline{\chi}}_1^0 $$ , where χ ¯ 1 0 $$ {\overline{\chi}}_1^0 $$ is the lightest neutralino. The one-lepton final state targets models where bottom or top squarks are produced and can decay into multiple channels, b ¯ 1 → b χ ¯ 1 0 $$ {\overline{b}}_1\to b{\overline{\chi}}_1^0 $$ and b ¯ 1 → t χ ¯ 1 ± $$ {\overline{b}}_1\to t{\overline{\chi}}_1^{\pm } $$ , or t ¯ 1 → t χ ¯ 1 0 $$ {\overline{t}}_1\to t{\overline{\chi}}_1^0 $$ and t ¯ 1 → b χ ¯ 1 ± $$ {\overline{t}}_1\to b{\overline{\chi}}_1^{\pm } $$ , where χ ¯ 1 ± $$ {\overline{\chi}}_1^{\pm } $$ is the lightest chargino and the mass difference m χ ¯ 1 ± − m χ ¯ 1 0 $$ {m}_{{\overline{\chi}}_1^{\pm }}-{m}_{{\overline{\chi}}_1^0} $$ is set to 1 GeV. No excess above the expected Standard Model background is observed. Exclusion limits at 95% confidence level on the mass of third-generation squarks are derived in various supersymmetry-inspired simplified models.
Keywords Hadron-Hadron scattering (experiments)
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arXiv: 1708.09266
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ATLAS COLLABORATION. Search for supersymmetry in events with b -tagged jets and missing transverse momentum in pp collisions at √s = 13 TeV with the ATLAS detector. In: Journal of High Energy Physics, 2017, vol. 1711, p. 195-245. https://archive-ouverte.unige.ch/unige:101037

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Deposited on : 2018-01-02

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