Search for pair production of third-generation leptoquarks and top squarks in pp collisions at √s=7 TeV

Please use this identifier to cite or link to this item: https://ir.lib.ncu.edu.tw/handle/987654321/106828

Title:	Search for pair production of third-generation leptoquarks and top squarks in pp collisions at √s=7 TeV
Authors:	張元翰;Chatrchyan, S;Tumasyan, A;Mucibello, L;Dias, F A;Padula, Sandra S;Meng, X;Osorio Oliveros, A F;Polic, D;Kortelainen, M J;Besancon, M;Bianchini, L;Hebbeker, T;Weber, M;Geisler, M;Eckstein, D;Novgorodova, O;Feindt, M;Hauth, T;Niegel, M;Oehler, A;Saoulidou, N;Veszpremi, V;Palinkas, J;Kumar, V;Lusito, L;Barbagli, G;Branca, A;Lazzizzera, I;Torre, P;Biino, C;Musich, M;Potenza, A;Kim, Zero J;Ryu, G;Carrillo Moreno, S;Silverwood, H;Bialkowska, H;Szleper, M;Malakhov, A;Moisenz, P;Savrin, V;Leonidov, A;Vinogradov, A;Bitioukov, S;Fernandez Bedoya, C;Bocci, A;De Roeck, A;Hinzmann, A;Lenzi, P;Perrozzi, L;Rovere, M;Sekmen, S;Martinez Ruiz Del Arbol, P;Moortgat, F;Petrakou, E;Wang, M;Dumanoglu, I;Yildirim, E;Olaiya, E;Shepherd-Themistocleous, C H;Jarvis, M;Magnan, A-M;Henderson, C;Speer, T;Rakness, G;Sumowidagdo, S;Mangano, B;McColl, N;Spiropulu, M;Gaz, A;Alexander, J;Thompson, J;Freeman, J;Hanlon, J;Sellers, P;Adams, T;Veeraraghavan, V;Kalakhety, H;Duru, F;Maksimovic, P;Kellogg, R G;Cali, I A;Krajczar, K;Wenger, E A;Iashvili, I;Halyo, V;Lopes Pegna, D;Raval, A;Tully, C;Chou, J P;Patel, R;Salur, S;Hollingsworth, M;Yang, Z C;Eusebi, R;Montalvo, R;Akchurin, N;Arenton, M W;Hirosky, R;Herndon, M
Contributors:	理學院物理學系
Date:	2013-02-20
Issue Date:	2026-04-23 13:46:01 (UTC+8)
Abstract:	摘要： Results are presented from a search for the pair production of third-generation scalar and vector leptoquarks, as well as for top squarks in R-parity-violating supersymmetric models. In either scenario, the new, heavy particle decays into a τ lepton and a b quark. The search is based on a data sample of pp collisions at sqrt[s] = 7 TeV, which is collected by the CMS detector at the LHC and corresponds to an integrated luminosity of 4.8 fb(-1). The number of observed events is found to be in agreement with the standard model prediction, and exclusion limits on mass parameters are obtained at the 95% confidence level. Vector leptoquarks with masses below 760 GeV are excluded and, if the branching fraction of the scalar leptoquark decay to a τ lepton and a b quark is assumed to be unity, third-generation scalar leptoquarks with masses below 525 GeV are ruled out. Top squarks with masses below 453 GeV are excluded for a typical benchmark scenario, and limits on the coupling between the top squark, τ lepton, and b quark, λ(333)(') are obtained. These results are the most stringent for these scenarios to date.Results are presented from a search for the pair production of third-generation scalar and vector leptoquarks, as well as for top squarks in R-parity-violating supersymmetric models. In either scenario, the new, heavy particle decays into a τ lepton and a b quark. The search is based on a data sample of pp collisions at sqrt[s] = 7 TeV, which is collected by the CMS detector at the LHC and corresponds to an integrated luminosity of 4.8 fb(-1). The number of observed events is found to be in agreement with the standard model prediction, and exclusion limits on mass parameters are obtained at the 95% confidence level. Vector leptoquarks with masses below 760 GeV are excluded and, if the branching fraction of the scalar leptoquark decay to a τ lepton and a b quark is assumed to be unity, third-generation scalar leptoquarks with masses below 525 GeV are ruled out. Top squarks with masses below 453 GeV are excluded for a typical benchmark scenario, and limits on the coupling between the top squark, τ lepton, and b quark, λ(333)(') are obtained. These results are the most stringent for these scenarios to date. 出版日期： 2013-02-22 出處： Physical review letters, 2013-02, Vol.110 (8), p.081801 資源來源： American Physical Society Journals 識別號： ISSN: 1079-7114 識別號： EISSN: 1079-7114 識別號： DOI: 10.1103/PhysRevLett.110.081801
Appears in Collections:	[Department of Physics] journal & Dissertation

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