Search for long-lived neutral particles decaying to quark-antiquark pairs in proton-proton collisions at s =8TeV

Please use this identifier to cite or link to this item: https://ir.lib.ncu.edu.tw/handle/987654321/106408

Title:	Search for long-lived neutral particles decaying to quark-antiquark pairs in proton-proton collisions at s =8TeV
Authors:	林宗泰;Ghete, V. M.;Waltenberger, W.;Wulz, C.-E.;Mccartin, J.;Salva Diblen, S.;Strobbe, N.;Tytgat, M.;Yazgan, E.;Pagano, D.;De Jesus Damiao, D.;Liang, S.;Li, W.;Zou, W.;Chaparro Sierra, L. F.;Florez, C.;Locci, E.;Dalchenko, M.;Zabi, A.;Agram, J.-L.;Mirabito, L.;Perieanu, A.;Erdmann, M.;Papacz, P.;Calligaris, L.;Costanza, F.;Melzer-Pellmann, I.-A.;Meyer, A. B.;Wissing, C.;Erfle, J.;Troendle, D.;Lobelle Pardo, P.;Agapitos, A.;Kesisoglou, S.;Gupta, R.;Gomber, B.;Sarkar, S.;Dewanjee, R. K.;Marcellini, S.;Navarria, F. L.;Rovelli, T.;Tosi, S.;Fabozzi, F.;Margoni, M.;Savoy-Navarro, A.;Grassi, M.;Kim, T. J.;Juodagalvis, A.;Komaragiri, J. R.;Morelos Pineda, A.;Gomez, G.;Scodellaro, L.;Dobson, M.;Buchmann, M. A.;Quittnat, M.;Ronga, F. J.;Akin, I. V.;Bahtiyar, H.;Harper, S.;Olaiya, E.;Cripps, N.;Fulcher, J.;Futyan, D.;Kenzie, M.;Nikitenko, A.;Pela, J.;Fantasia, C.;Landsberg, G.;Calderon De La Barca Sanchez, M.;Ko, W.;Ignatenko, M.;Gary, J. W.;Campagnari, C.;Geffert, P.;Apresyan, A.;Duarte, J.;Thompson, J.;Bauerdick, L. A. T.;Harris, R. M.;Johnson, M.;Taylor, L.;Das, S.;Bochenek, J.;Haas, J.;Gauthier, L.;Yetkin, T.;Ivanov, A.;Tonjes, M. B.;Wyslouch, B.;Claes, D. R.;Gonzalez Suarez, R.;Hahn, K. A.;Driga, O.;Medvedeva, T.;Silvers, D.;Garcia-Bellido, A.;Chou, J. P.;Dudero, P. R.;Delannoy, A. G.;Snook, B.;Ojalvo, I.
Contributors:	理學院物理學系
Keywords:	Channels;Collisions;Confidence intervals;Cross sections;Decay;Fermions;Neutral particles;PHYSICS OF ELEMENTARY PARTICLES AND FIELDS;Searching
Date:	2015-01-20
Issue Date:	2026-04-23 13:21:31 (UTC+8)
Publisher:	United States: American Physical Society
Abstract:	摘要： A search is performed for long-lived massive neutral particles decaying to quark-antiquark pairs. The experimental signature is a distinctive topology of a pair of jets, originating at a secondary vertex. Events were collected with the CMS detector at the CERN LHC in proton-proton collisions at a center-of-mass energy of 8 TeV. The data analyzed correspond to an integrated luminosity of 18.5 fb super(-1). No significant excess is observed above standard model expectations. Upper limits at 95% confidence level are set on the production cross section of a heavy neutral scalar particle, H, in the mass range of 200 to 1000 GeV, decaying promptly into a pair of long-lived neutral X particles in the mass range of 50 to 350 GeV, each in turn decaying into a quark-antiquark pair. For X with mean proper decay lengths of 0.4 to 200 cm, the upper limits are typically 0.5-200 fb. The results are also interpreted in the context of an R-parity-violating supersymmetric model with long-lived neutralinos decaying into a quark-antiquark pair and a muon. For pair production of squarks that promptly decay to neutralinos with mean proper decay lengths of 2-40 cm, the upper limits on the cross section are typically 0.5-3 fb. The above limits are the most stringent on these channels to date. 出版者： United States: American Physical Society 出版日期： 2015-01-20 出處： Physical review. D, Particles, fields, gravitation, and cosmology, 2015-01, Vol.91 (1), Article 012007 識別號： ISSN: 1550-7998 識別號： EISSN: 1550-2368 識別號： DOI: 10.1103/PhysRevD.91.012007
Appears in Collections:	[Department of Physics] journal & Dissertation

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