The top-quark mass is measured in proton-proton collisions at root s = 7 TeV using a data sample corresponding to an integrated luminosity of 5.0 fb(-1) collected by the CMS experiment at the LHC. The measurement is performed in the dilepton decay channel t (t) over bar -> (l(+)nu(l)b) (l-(nu) over bar (l)(b) over bar), where l = e, mu. Candidate top-quark decays are selected by requiring two leptons, at least two jets, and imbalance in transverse momentum. The mass is reconstructed with an analytical matrix weighting technique using distributions derived from simulated samples. Using a maximum-likelihood fit, the top-quark mass is determined to be 172.5 +/- 0.4 (stat.) +/- 1.5 (syst.) GeV. RI Petrushanko, Sergey/D-6880-2012; Lokhtin, Igor/D-7004-2012; Wulz, Claudia-Elisabeth/H-5657-2011; Raidal, Martti/F-4436-2012; Venturi, Andrea/J-1877-2012; Snigirev, Alexander/D-8912-2012; Novaes, Sergio/D-3532-2012; Stahl, Achim/E-8846-2011; Karancsi, Janos/A-9710-2013; Dudko, Lev/D-7127-2012; Mercadante, Pedro/K-1918-2012; tosi, mia/J-5777-2012; Della Ricca, Giuseppe/B-6826-2013; Kadastik, Mario/B-7559-2008; Mundim, Luiz/A-1291-2012; De La Cruz Burelo, Eduard/B-9802-2013; Santaolalla, Javier/C-3094-2013; Alves, Gilvan/C-4007-2013; Azzi, Patrizia/H-5404-2012; Tinoco Mendes, Andre David/D-4314-2011; Fruhwirth, Rudolf/H-2529-2012; Flix, Josep/G-5414-2012; Rolandi, Luigi (Gigi)/E-8563-2013; Montanari, Alessandro/J-2420-2012; Tomei, Thiago/E-7091-2012; Zalewski, Piotr/H-7335-2013; Tinti, Gemma/I-5886-2013 OI Novaes, Sergio/0000-0003-0471-8549; Stahl, Achim/0000-0002-8369-7506; Karancsi, Janos/0000-0003-0802-7665; Dudko, Lev/0000-0002-4462-3192; Della Ricca, Giuseppe/0000-0003-2831-6982; Mundim, Luiz/0000-0001-9964-7805; De La Cruz Burelo, Eduard/0000-0002-7469-6974; Tinoco Mendes, Andre David/0000-0001-5854-7699; Rolandi, Luigi (Gigi)/0000-0002-0635-274X;

Measurement of the top-quark mass in tt¯ events with lepton+jets final states in pp collisions at s√=7 TeV

Abbrescia, M;De Palma, M;My, S;Nuzzo, S;Pompili, A;Selvaggi, G;Venditti, R;
2012

Abstract

The top-quark mass is measured in proton-proton collisions at root s = 7 TeV using a data sample corresponding to an integrated luminosity of 5.0 fb(-1) collected by the CMS experiment at the LHC. The measurement is performed in the dilepton decay channel t (t) over bar -> (l(+)nu(l)b) (l-(nu) over bar (l)(b) over bar), where l = e, mu. Candidate top-quark decays are selected by requiring two leptons, at least two jets, and imbalance in transverse momentum. The mass is reconstructed with an analytical matrix weighting technique using distributions derived from simulated samples. Using a maximum-likelihood fit, the top-quark mass is determined to be 172.5 +/- 0.4 (stat.) +/- 1.5 (syst.) GeV. RI Petrushanko, Sergey/D-6880-2012; Lokhtin, Igor/D-7004-2012; Wulz, Claudia-Elisabeth/H-5657-2011; Raidal, Martti/F-4436-2012; Venturi, Andrea/J-1877-2012; Snigirev, Alexander/D-8912-2012; Novaes, Sergio/D-3532-2012; Stahl, Achim/E-8846-2011; Karancsi, Janos/A-9710-2013; Dudko, Lev/D-7127-2012; Mercadante, Pedro/K-1918-2012; tosi, mia/J-5777-2012; Della Ricca, Giuseppe/B-6826-2013; Kadastik, Mario/B-7559-2008; Mundim, Luiz/A-1291-2012; De La Cruz Burelo, Eduard/B-9802-2013; Santaolalla, Javier/C-3094-2013; Alves, Gilvan/C-4007-2013; Azzi, Patrizia/H-5404-2012; Tinoco Mendes, Andre David/D-4314-2011; Fruhwirth, Rudolf/H-2529-2012; Flix, Josep/G-5414-2012; Rolandi, Luigi (Gigi)/E-8563-2013; Montanari, Alessandro/J-2420-2012; Tomei, Thiago/E-7091-2012; Zalewski, Piotr/H-7335-2013; Tinti, Gemma/I-5886-2013 OI Novaes, Sergio/0000-0003-0471-8549; Stahl, Achim/0000-0002-8369-7506; Karancsi, Janos/0000-0003-0802-7665; Dudko, Lev/0000-0002-4462-3192; Della Ricca, Giuseppe/0000-0003-2831-6982; Mundim, Luiz/0000-0001-9964-7805; De La Cruz Burelo, Eduard/0000-0002-7469-6974; Tinoco Mendes, Andre David/0000-0001-5854-7699; Rolandi, Luigi (Gigi)/0000-0002-0635-274X;
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/11586/135065
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