Search for anomalous tt̄ production in the highly-boosted all-hadronic final stat

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题名:	Search for anomalous tt̄ production in the highly-boosted all-hadronic final stat
作者:	張元翰;Chatrchyan, S.;Wagner, P.;Waltenberger, W.;Blyweert, S.;Bruno, G.;Asawatangtrakuldee, C.;Morovic, S.;Mousa, J.;Kortelainen, M. J.;Locci, E.;Haguenauer, M.;Sammet, J.;Schmitz, S. A.;Steggemann, J.;Rennefeld, J.;Dammann, D.;Wissing, C.;Erfle, J.;Troendle, D.;Geralis, T.;Mavrommatis, C.;Kohli, J. M.;Dutta, D.;Dugad, S.;Hesari, H.;Selvaggi, G.;Marcellini, S.;Fabozzi, F.;Ronchese, P.;Vanini, S.;Boccali, T.;Fanelli, C.;Organtini, G.;Chung, J.;Kim, G. N.;Ro, S. R.;Seo, E.;Yu, I.;Hoorani, H. R.;Szleper, M.;Vorobyev, A.;Kossov, M.;Dremin, I.;Maestre, J. Alcaraz;Lopez, S. Goy;Codispoti, G.;de Trocóniz, J. F.;Folgueras, S.;Rivero, C. Martinez;Sanchez, F. J. Munoz;Dupont-Sagorin, N.;Langenegger, U.;Mohr, N.;Sanchez, A. K.;Theofilatos, K.;Dozen, C.;Deliomeroglu, M.;Isildak, B.;Levchuk, L.;Nirunpong, K.;Hall, G.;Raymond, D. M.;Liu, H.;Rumerio, P.;Kukartsev, G.;Nguyen, D.;Breedon, R.;Erbacher, R.;Mall, O.;Evans, D.;Tadel, M.;Justus, C.;Wilkinson, R.;Hirschauer, J.;O’Dell, V.;Uplegger, L.;Kim, B.;Korytov, A.;Newsom, C. R.;Lange, D.;Hahn, K. A.;Haupt, J.;Zhang, J.;Mucia, N.;Ruchti, R.;Hughes, R.;Werner, J. S.;Benedetti, D.;Bortoletto, D.;Svyatkovskiy, A.;Eshaq, Y.;Damgov, J.;Libeiro, T.;Volobouev, I.;Greene, S.;Gurrola, A.;Goodell, J.;Anderson, M.;Lazaridis, C.;Loveless, R.
贡献者:	理學院物理學系
日期:	2012-01-01
上传时间:	2026-04-23 12:58:21 (UTC+8)
摘要:	摘要： A search is presented for a massive particle, generically referred to as a Z ′ , decaying into a$ {\mathrm{t}}\overline {\mathrm{t}} $pair. The search focuses on Z ′ resonances that are sufficiently massive to produce highly Lorentz-boosted top quarks, which yield collimated decay products that are partially or fully merged into single jets. The analysis uses new methods to analyze jet substructure, providing suppression of the non-top multijet backgrounds. The analysis is based on a data sample of proton-proton collisions at a center-of-mass energy of 7 TeV, corresponding to an integrated luminosity of 5 fb −1 . Upper limits in the range of 1 pb are set on the product of the production cross section and branching fraction for a topcolor Z ′ modeled for several widths, as well as for a Randall-Sundrum Kaluza-Klein gluon. In addition, the result contrain any enhancement in$ {\mathrm{t}}\overline {\mathrm{t}} $production beyond expectations of the standard mode for tt invariant mass larger than 1 TeV/ c 2 . 出版日期： 2012-09 出處： The journal of high energy physics, 2012-09, Vol.2012 (9), Article 29 資源來源： Publicly Available Content Database 識別號： ISSN: 1029-8479 識別號： ISSN: 1126-6708 識別號： ISSN: 1127-2236 識別號： EISSN: 1029-8479 識別號： DOI: 10.1007/JHEP09(2012)029
显示于类别:	[物理學系] 期刊論文

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