Search for production of vector-like quark pairs and of four top quarks in the lepton-plus-jets final state in pp collisions at root 8=8 tev with the atlas detector
文献类型：期刊论文
| 作者 | Aad, G.122,123; Abbott, B.155; Abdallah, J.217; Abdinov, O.14; Aben, R.148,149; Abolins, M.128; AbouZeid, O. S.225; Abramowicz, H.219; Abreu, H.218; Abreu, R.45 |
| 刊名 | Journal of high energy physics
 |
| 出版日期 | 2015-08-20 |
| 期号 | 8页码:86 |
| 关键词 | Hadron-hadron scattering |
| ISSN号 | 1029-8479 |
| DOI | 10.1007/jhep08(2015)105 |
| 英文摘要 | A search for pair production of vector-like quarks, both up-type (t) and down-type (b), as well as for four-top-quark production, is presented. the search is based on pp collisions at tev recorded in 2012 with the atlas detector at the cern large hadron collider and corresponding to an integrated luminosity of 20.3 fb(-1). data are analysed in the lepton-plus-jets final state, characterised by an isolated electron or muon with high transverse momentum, large missing transverse momentum and multiple jets. dedicated analyses are performed targeting three cases: a t quark with significant branching ratio to a w boson and a b-quark , and both a t quark and a b quark with significant branching ratio to a higgs boson and a third-generation quark ( respectively). no significant excess of events above the standard model expectation is observed, and 95% cl lower limits are derived on the masses of the vector-like t and b quarks under several branching ratio hypotheses assuming contributions from t -> wb, zt, ht and b -> wt, zb, hb decays. the 95% cl observed lower limits on the t quark mass range between 715 gev and 950 gev for all possible values of the branching ratios into the three decay modes, and are the most stringent constraints to date. additionally, the most restrictive upper bounds on four-top-quark production are set in a number of new physics scenarios. |
| 语种 | 英语 |
| WOS记录号 | WOS:000360408100001 |
| 出版者 | SPRINGER |
| URI标识 | http://www.irgrid.ac.cn/handle/1471x/1639639 |
| 专题 | 高能物理研究所 |
| 通讯作者 | Sampsonidis, D. |
| 作者单位 | 1.Univ Adelaide, Dept Phys, Adelaide, SA, Australia 2.SUNY Albany, Dept Phys, Albany, NY 12222 USA 3.Univ Alberta, Dept Phys, Edmonton, AB, Canada 4.Ankara Univ, Dept Phys, TR-06100 Ankara, Turkey 5.Istanbul Aydin Univ, Istanbul, Turkey 6.TOBB Univ Econ & Technol, Div Phys, Ankara, Turkey 7.IN2P3, CNRS, LAPP, Annecy Le Vieux, France 8.Univ Savoie Mt Blanc, Annecy Le Vieux, France 9.Argonne Natl Lab, Div High Energy Phys, Argonne, IL 60439 USA 10.Univ Arizona, Dept Phys, Tucson, AZ 85721 USA |
| 推荐引用方式 GB/T 7714 | Aad, G.,Abbott, B.,Abdallah, J.,et al. Search for production of vector-like quark pairs and of four top quarks in the lepton-plus-jets final state in pp collisions at root 8=8 tev with the atlas detector[J]. Journal of high energy physics,2015(8):86. |
| APA | Aad, G..,Abbott, B..,Abdallah, J..,Abdinov, O..,Aben, R..,...&Hays, C. P..(2015).Search for production of vector-like quark pairs and of four top quarks in the lepton-plus-jets final state in pp collisions at root 8=8 tev with the atlas detector.Journal of high energy physics(8),86. |
| MLA | Aad, G.,et al."Search for production of vector-like quark pairs and of four top quarks in the lepton-plus-jets final state in pp collisions at root 8=8 tev with the atlas detector".Journal of high energy physics .8(2015):86. |
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