Measurement of the cross section ratio σtt¯bb¯/σtt¯jj in pp collisions at s=8 TeV

Please use this identifier to cite or link to this item: https://ir.lib.ncu.edu.tw/handle/987654321/105251

Title:	Measurement of the cross section ratio σtt¯bb¯/σtt¯jj in pp collisions at s=8 TeV
Authors:	余欣珊;Sirunyan, A.M.;Waltenberger, W.;Wulz, C.-E.;De Wolf, E.A.;Mccartin, J.;Salva Diblen, S.;Strobbe, N.;Tytgat, M.;Yazgan, E.;Pagano, D.;De Jesus Damiao, D.;Liang, S.;Li, W.;Zou, W.;Florez, C.;Härkönen, J.;Givernaud, A.;Charlot, C.;Chasserat, J.;Sabes, D.;Kargoll, B.;Eckerlin, G.;Lutz, B.;Ntomari, E.;Garutti, E.;Anagnostou, G.;Naimuddin, M.;Ranjan, K.;Parida, B.;Wickramage, N.;De Palma, M.;Masetti, G.;Costa, S.;Gennai, S.;Lucchini, M.T.;Ronchese, P.;Gabusi, M.;Ratti, S.P.;Riccardi, C.;Venturi, A.;Longo, E.;Costa, M.;Potenza, A.;Choi, S.;Kwon, E.;Yu, I.;Krofcheck, D.;Oreshkin, V.;Smirnov, I.;Uvarov, L.;Andreev, Yu;Golubev, N.;Lychkovskaya, N.;Kirakosyan, M.;Snigirev, A.;Ekmedzic, M.;De La Cruz, B.;Gonzalez Lopez, O.;Merino, G.;Missiroli, M.;Camporesi, T.;Girone, M.;Gundacker, S.;Lecoq, P.;Malgeri, L.;Sakulin, H.;Vlimant, J.R.;Bianchini, L.;Chang, P.;Asavapibhop, B.;Isildak, B.;Hall, G.;Heintz, U.;Kukartsev, G.;Breedon, R.;Lacroix, F.;Incandela, J.;Mott, A.;Chu, J.;Butler, J.N.;Spiegel, L.;Barnett, B.A.;Kenny III, R.P.;Murray, M.;Gronberg, J.;Gomez Ceballos, G.;Ma, T.;Velicanu, D.;Singovsky, A.;Dominguez, A.;Jung, K.;Lopes Pegna, D.;Zablocki, J.;Zabel, J.;Han, J.;Contreras-Campana, E.;Walker, M.;Dudero, P.R.;Sturdy, J.;Ojalvo, I.
Contributors:	理學院物理學系
Keywords:	CMS;Physics;Top physics
Date:	2015-06-30
Issue Date:	2026-04-23 12:13:11 (UTC+8)
Publisher:	Elsevier B.V
Abstract:	摘要： The first measurement of the cross section ratio σtt¯bb¯/σtt¯jj is presented using a data sample corresponding to an integrated luminosity of 19.6 fb−1 collected in pp collisions at s=8 TeV with the CMS detector at the LHC. Events with two leptons (e or μ) and four reconstructed jets, including two identified as b quark jets, in the final state are selected. The ratio is determined for a minimum jet transverse momentum pT of both 20 and 40 GeV/c. The measured ratio is 0.022±0.003(stat)±0.005(syst) for pT>20 GeV/c. The absolute cross sections σtt¯bb¯ and σtt¯jj are also measured. The measured ratio for pT>40 GeV/c is compatible with a theoretical quantum chromodynamics calculation at next-to-leading order. 出版者： Elsevier B.V 出版日期： 2015-06-30 出處： Physics letters. B, 2015-06, Vol.746, p.132-153 資源來源： Elsevier ScienceDirect Journals Complete 版權： 2015 CERN for the benefit of the CMS Collaboration 識別號： ISSN: 0370-2693 識別號： EISSN: 1873-2445 識別號： DOI: 10.1016/j.physletb.2015.04.060
Appears in Collections:	[Department of Physics] journal & Dissertation

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