Search for pair production of third-generation scalar leptoquarks and top squarks in proton–proton collisions at [Formula presented] TeV

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题名:	Search for pair production of third-generation scalar leptoquarks and top squarks in proton–proton collisions at [Formula presented] TeV
作者:	林宗泰;Sirunyan, A.M.;Waltenberger, W.;Wulz, C.-E.;De Wolf, E.A.;Mccartin, J.;Salva Diblen, S.;Strobbe, N.;Tytgat, M.;Yazgan, E.;Pagano, D.;De Jesus Damiao, D.;Liang, S.;Li, W.;Zou, W.;Florez, C.;Härkönen, J.;Givernaud, A.;Charlot, C.;Chasserat, J.;Sabes, D.;Kargoll, B.;Eckerlin, G.;Ntomari, E.;Garutti, E.;Geralis, T.;Naimuddin, M.;Ranjan, K.;Parida, B.;Wickramage, N.;De Palma, M.;Masetti, G.;Costa, S.;Gennai, S.;Lucchini, M.T.;Ronchese, P.;Gabusi, M.;Ratti, S.P.;Riccardi, C.;Venturi, A.;Longo, E.;Costa, M.;Potenza, A.;Choi, S.;Kwon, E.;Yu, I.;Krofcheck, D.;Smirnov, I.;Uvarov, L.;Andreev, Yu;Golubev, N.;Lychkovskaya, N.;Kirakosyan, M.;Snigirev, A.;Ekmedzic, M.;De La Cruz, B.;Gonzalez Lopez, O.;Merino, G.;Missiroli, M.;Camporesi, T.;Bianchini, L.;Takahashi, M.;Yang, Y.;Lu, Y.J.;Chen, P.H.;Harper, S.;Olaiya, E.;Cripps, N.;Fulcher, J.;Futyan, D.;Kenzie, M.;Nikitenko, A.;Pela, J.;Symonds, P.;Henderson, C.;Farrell, C.;Valuev, V.;Gary, J.W.;Luthra, A.;Shrinivas, A.;Cheung, H.W.K.;Vidal, R.;Muniz, L.;Hewamanage, S.;Johnson, K.F.;Haytmyradov, M.;Yi, K.;Yang, M.;Meier, F.;Hill, C.;Piroué, P.;Benedetti, D.;Kress, M.;Merkel, P.;Barker, A.;Gray, R.;York, A.;Kovitanggoon, K.;Ledovskoy, A.;Dasu, S.;Lazaridis, C.
贡献者:	理學院物理學系
关键词:	CMS;Leptoquark;Physics;Top squark
日期:	2014-12-12
上传时间:	2026-04-23 13:46:15 (UTC+8)
出版者:	Netherlands: Elsevier B.V
摘要:	摘要： A search for pair production of third-generation scalar leptoquarks and supersymmetric top quark partners, top squarks, in final states involving tau leptons and bottom quarks is presented. The search uses events from a data sample of proton–proton collisions corresponding to an integrated luminosity of 19.7 fb−1, collected with the CMS detector at the LHC with s=8 TeV. The number of observed events is found to be in agreement with the expected standard model background. Third-generation scalar leptoquarks with masses below 740 GeV are excluded at 95% confidence level, assuming a 100% branching fraction for the leptoquark decay to a tau lepton and a bottom quark. In addition, this mass limit applies directly to top squarks decaying via an R-parity violating coupling λ333′. The search also considers a similar signature from top squarks undergoing a chargino-mediated decay involving the R-parity violating coupling λ3jk′. Each top squark decays to a tau lepton, a bottom quark, and two light quarks. Top squarks in this model with masses below 580 GeV are excluded at 95% confidence level. The constraint on the leptoquark mass is the most stringent to date, and this is the first search for top squarks decaying via λ3jk′. 出版者： Netherlands: Elsevier B.V 出版日期： 2014-12-01 出處： Physics letters. B, 2014-12, Vol.739 (C), p.229-249 資源來源： Elsevier ScienceDirect Journals Complete 版權： 2014 The Authors 識別號： ISSN: 0370-2693 識別號： EISSN: 1873-2445 識別號： DOI: 10.1016/j.physletb.2014.10.063
显示于类别:	[物理學系] 期刊論文

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