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| 題名: | Measurement of associated production of vector bosons and top quark-antiquark pairs in pp collisions at √s=7 TeV |
| 作者: | 余欣珊;Chatrchyan, S;Tumasyan, A;Jeitler, M;Knünz, V;Villella, I;Lellouch, J;Sigamani, M;Basegmez, S;Castello, R;Martins, T;Marinho, F;Hadjiiska, R;Pavlov, B;Chen, H S;Xu, M;Liu, S;Mousa, J;Benhabib, L;Busson, P;Mironov, C;Andrea, J;Schmitz, S A;Thüer, S;Perchalla, L;Nowak, F;Stadie, H;Niegel, M;Wayand, S;Saoulidou, N;Palinkas, J;Karancsi, J;Dhingra, N;De Palma, M;Fiore, L;Grandi, C;Montanari, A;Bianco, S;Ghezzi, A;Buontempo, S;Riccardi, C;Martínez-Ortega, J;Dominik, W;Andreev, Yu;Rusakov, S V;Klyukhin, V;Krychkine, V;Brun, H;Calderon, A;Jorda, C;Rodríguez-Marrero, A Y;Scodellaro, L;Elliott-Peisert, A;Gowdy, S;Perez, E;Rodrigues Antunes, J;Bertl, W;Erdmann, W;Nessi-Tedaldi, F;Volpe, R;Yu, S S;Suwonjandee, N;Ozturk, S;Coughlan, J A;Colling, D;Hatherell, Z;Wardle, N;Speer, T;Smith, J;Squires, M;Gary, J W;Wimpenny, S;Evans, D;Bornheim, A;Di Marco, E;Xie, S;Ferguson, T;Nicolas Kaufman, G;Albrow, M;Marraffino, J M;Kropivnitskaya, A;Gaultney, V;Markowitz, P;Gerber, C E;Norbeck, E;Whitbeck, A;Noonan, D;Marionneau, M;Singovsky, A;Rahmat, R;Chasco, M;Anastassov, A;Hildreth, M;Luo, W;Maroussov, V;Svyatkovskiy, A;Akgun, B;Bhatti, A;Wood, J;Gollapinni, S;Dasu, S |
| 貢獻者: | 理學院物理學系 |
| 日期: | 2013-04-25 |
| 上傳時間: | 2026-04-23 12:09:02 (UTC+8) |
| 摘要: | 摘要： The first measurement of vector-boson production associated with a top quark-antiquark pair in proton-proton collisions at sqrt[s] = 7 TeV is presented. The results are based on a data set corresponding to an integrated luminosity of 5.0 fb(-1), recorded by the CMS detector at the LHC in 2011. The measurement is performed in two independent channels through a trilepton analysis of ttZ events and a same-sign dilepton analysis of ttV (V = W or Z) events. In the trilepton channel a direct measurement of the ttZ cross section σ(ttZ) = 0.28(-0.11)(+0.14) (stat)(-0.03)(+0.06) (syst) pb is obtained. In the dilepton channel a measurement of the ttV cross section yields σ(ttV) = 0.43(-0.15)(+0.17) (stat)(-0.07)(+0.09) (syst) pb. These measurements have a significance, respectively, of 3.3 and 3.0 standard deviations from the background hypotheses and are compatible, within uncertainties, with the corresponding next-to-leading order predictions of 0.137(-0.016)(+0.012) and 0.306(-0.053)(+0.031) pb.The first measurement of vector-boson production associated with a top quark-antiquark pair in proton-proton collisions at sqrt[s] = 7 TeV is presented. The results are based on a data set corresponding to an integrated luminosity of 5.0 fb(-1), recorded by the CMS detector at the LHC in 2011. The measurement is performed in two independent channels through a trilepton analysis of ttZ events and a same-sign dilepton analysis of ttV (V = W or Z) events. In the trilepton channel a direct measurement of the ttZ cross section σ(ttZ) = 0.28(-0.11)(+0.14) (stat)(-0.03)(+0.06) (syst) pb is obtained. In the dilepton channel a measurement of the ttV cross section yields σ(ttV) = 0.43(-0.15)(+0.17) (stat)(-0.07)(+0.09) (syst) pb. These measurements have a significance, respectively, of 3.3 and 3.0 standard deviations from the background hypotheses and are compatible, within uncertainties, with the corresponding next-to-leading order predictions of 0.137(-0.016)(+0.012) and 0.306(-0.053)(+0.031) pb.
出版日期： 2013-04-26
出處： Physical review letters, 2013-04, Vol.110 (17), p.172002
資源來源： APS online
識別號： ISSN: 1079-7114
識別號： EISSN: 1079-7114
識別號： DOI: 10.1103/PhysRevLett.110.172002 |
| 顯示於類別: | [物理學系] 期刊論文
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