Search for supersymmetry in events with soft leptons, low jet multiplicity, and missing transverse energy in proton–proton collisions at √s=8 TeV

Please use this identifier to cite or link to this item: https://ir.lib.ncu.edu.tw/handle/987654321/107123

Title:	Search for supersymmetry in events with soft leptons, low jet multiplicity, and missing transverse energy in proton–proton collisions at √s=8 TeV
Authors:	余欣珊;Sirunyan, A.M.;Hartl, C.;Jeitler, M.;Knutsson, A.;Karapostoli, G.;Ryckbosch, D.;Musich, M.;Quertenmont, L.;Pol, M.E.;De Jesus Damiao, D.;Bernardes, C.A.;Padula, Sandra S.;Romero Abad, D.;Sultanov, G.;Cheng, T.;Shaheen, S.M.;Pekkanen, J.;Beaudette, F.;Dahms, T.;Zabi, A.;Weber, H.;Sonnenschein, L.;Choudhury, S.;Karacheban, O.;Heindl, S.M.;Kornmayer, A.;Giakoumopoulou, V.A.;Sahoo, D.K.;Kumar, Ashok;Mazumdar, K.;Mitra, S.;Bisello, D.;Schizzi, A.;Park, S.K.;Kwon, E.;Vaitkus, J.;Mohamad Idris, F.;Wan Abdullah, W.A.T.;Sanchez-Hernandez, A.;Shoaib, M.;Baskakov, A.;Krychkine, V.;Fernández Ramos, J.P.;Quintario Olmeda, A.;de Trocóniz, J.F.;Missiroli, M.;Calderon, A.;Bachtis, M.;Bonato, A.;Breuker, H.;du Pree, T.;Sphicas, P.;Quittnat, M.;Wallny, R.;Robmann, P.;Yu, S.S.;Miñano Moya, M.;Tali, B.;Karapinar, G.;Cakir, A.;Sen, S.;Calligaris, L.;Richards, A.;Olivito, D.;Golf, F.;Newman, H.B.;Zhu, R.Y.;Paulini, M.;Wagner, S.R.;Teo, W.D.;Gutsche, O.;Acosta, D.;Korytov, A.;Rank, D.;Terentyev, N.;Rodriguez, J.L.;Silkworth, C.;Ferraioli, C.;Jabeen, S.;Kellogg, R.G.;Kunkle, J.;Skuja, A.;Roland, C.;Varma, M.;Evans, A.;Ruckstuhl, N.;Turkewitz, J.;Ratnikov, F.;Alyari, M.;Kharchilava, A.;Barberis, E.;Lannon, K.;Ling, T.Y.;Luo, W.;Piroué, P.;Xie, W.;Ecklund, K.M.;Park, M.;Dudero, P.R.;Neu, C.
Contributors:	理學院物理學系
Keywords:	CMS;Collisions;Decay;Leptons;Pair production;Physics;PHYSICS OF ELEMENTARY PARTICLES AND FIELDS;Searching;Standard model (particle physics);Supersymmetry
Date:	2016-08-10
Issue Date:	2026-04-23 13:57:10 (UTC+8)
Publisher:	Netherlands: Elsevier B.V
Abstract:	摘要： 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˜→bℓνχ˜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. 出版者： Netherlands: Elsevier B.V 出版日期： 2016-08-10 出處： Physics letters. B, 2016-08, Vol.759 (C), p.9-35 資源來源： Elsevier ScienceDirect Journals Complete 版權： 2016 The Author 識別號： ISSN: 0370-2693 識別號： EISSN: 1873-2445 識別號： DOI: 10.1016/j.physletb.2016.05.033
Appears in Collections:	[Department of Physics] journal & Dissertation

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