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| 題名: | Search for flavor changing neutral currents in top quark decays in pp collisions at 7 TeV |
| 作者: | 林宗泰;Apresyan, Artur;Bagliesi, Giuseppe;Velkovska, Julia;Varelas, Nikos;Innocente, Vincenzo;Hadjiiska, Roumyana;Gascon, Susan;Geiser, Achim;Spalding, William J;Markina, Anastasia;Chang, Yuan-Hann;Shukla, Prashant;Colaleo, Anna;Piotrzkowski, Krzysztof;Steinbrück, Georg;Avetisyan, Aram;Elliott-Peisert, Anna;Farrell, Chris;Pant, Lalit Mohan;Tricomi, Alessia;Martinez, German;Cockerill, David JA;Nappi, Aniello;Ferencek, Dinko;Haas, Jeff;Ekmedzic, Marko;Lu, Ying;Hollingsworth, Matthew;Brooke, James John;Thomsen, Jan;Mott, Alexander;Rommerskirchen, Tanja;Mohanty, Ajit Kumar;Spiropulu, Maria;De Moraes Gregores, Eduardo;Malcles, Julie;Jain, Shilpi;Luyckx, Sten;Danielson, Thomas;Fabbri, Fabrizio;Berry, Edmund;Chwalek, Thorsten;Dupont-Sagorin, Niels;Paktinat Mehdiabadi, Saeid;Szillasi, Zoltan;Bauer, Gerry;Hatakeyama, Kenichi;Kazana, Malgorzata;Dumanoglu, Isa;Frueboes, Tomasz;Segoni, Ilaria;Bachtis, Michail;Costa, Salvatore;Letts, James;Kim, Tae Jeong;Saka, Halil;Piparo, Danilo;Van Mechelen, Pierre;Vanini, Sara;Fulcher, Jonathan;West, Christopher;Gomez, Gervasio;Gninenko, Sergei;Dinardo, Mauro Emanuele;Ptochos, Fotios;Timciuc, Vladlen;Wilken, Rachel;Ford, William T;Grachov, Oleg;Kovalskyi, Dmytro;Damgov, Jordan;Boimska, Bozena;Chao, Yuan;Beri, Suman Bala;Cankocak, Kerem;Van Remortel, Nick;Rodozov, Mircho;Halkiadakis, Eva;Navarria, Francesco;Girgis, Semiray;Bellan, Riccardo;Kim, Gui Nyun;Sanders, Stephen;Chang, Sunghyun;Kalavase, Puneeth;De La Cruz, Begona;Laasanen, Alvin T;Goldstein, Joel;Naumann-Emme, Sebastian;Mehta, Pourus;Vavilov, Sergey;Mavrommatis, Charalampos;Dugad, Shashikant;Snow, Gregory R;Gilbert, Andrew;de Trocóniz, Jorge F;Kayis Topaksu, Aysel;Zhokin, Alexander;Mccartin, Joseph;Kreuzer, Peter |
| 貢獻者: | 理學院物理學系 |
| 關鍵詞: | CMS;Experiment;High Energy Physics - Experiment;Particle Physics;Physics;Searches;Top |
| 日期: | 2013-01-29 |
| 上傳時間: | 2026-04-23 13:10:46 (UTC+8) |
| 出版者: | United States: Elsevier B.V |
| 摘要: | 摘要： The results of a search for flavor changing neutral currents in top quark decays t $\to$ Zq in events with a topology compatible with the decay chain $t \bar{t} \to Wb+Zq \to ell \nu b + ell ell q$ are presented. The search is performed with a data sample corresponding to an integrated luminosity of 5.0 inverse femtobarns of proton-proton collisions at a center-of-mass energy of 7 TeV, collected with the CMS detector at the LHC. The observed number of events agrees with the standard model prediction and no evidence for flavor changing neutral currents in top quark decays is found. A t $\to$ Zq branching fraction greater than 0.24% is excluded at the 95% confidence level. The results of a search for flavor changing neutral currents in top quark decays t→Zq in events with a topology compatible with the decay chain tt¯→Wb+Zq→ℓνb+ℓℓq are presented. The search is performed with a data sample corresponding to an integrated luminosity of 5.0 fb−1 of proton–proton collisions at a center-of-mass energy of 7 TeV, collected with the CMS detector at the LHC. The observed number of events agrees with the standard model prediction and no evidence for flavor changing neutral currents in top quark decays is found. A t→Zq branching fraction greater than 0.21% is excluded at the 95% confidence level. The results of a search for flavor changing neutral currents in top quark decays t to Zq in events with a topology compatible with the decay chain t t-bar to Wb + Zq to ell nu b + ell ell q are presented. The search is performed with a data sample corresponding to an integrated luminosity of 5.0 inverse femtobarns of proton-proton collisions at a center-of-mass energy of 7 TeV, collected with the CMS detector at the LHC. The observed number of events agrees with the standard model prediction and no evidence for flavor changing neutral currents in top quark decays is found. A t to Zq branching fraction greater than 0.21% is excluded at the 95% confidence level.
出版者： United States: Elsevier B.V
出版日期： 2013-01-29
出處： Physics Letters. Section B, 2013-01, Vol.718 (4-5), p.1252-1272
資源來源： Elsevier ScienceDirect Journals Complete
版權： 2012 CERN
版權： CC0 1.0 - Universal
識別號： ISSN: 0370-2693
識別號： ISSN: 1873-2445
識別號： EISSN: 1873-2445
識別號： DOI: 10.1016/j.physletb.2012.12.045 |
| 顯示於類別: | [物理學系] 期刊論文
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