Search for dark matter and unparticles produced in association with a Z boson in proton-proton collisions at s =8 TeV

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题名:	Search for dark matter and unparticles produced in association with a Z boson in proton-proton collisions at s =8 TeV
作者:	余欣珊;Hartl, C.;Jeitler, M.;Knutsson, A.;Karapostoli, G.;Fagot, A.;Bruno, G.;Giammanco, A.;Mertens, A.;Pin, A.;Moraes, A.;Santoro, A.;Tao, J.;Malcles, J.;Pequegnot, A. L.;Erdmann, M.;Dolinska, G.;Baus, C.;Friese, R.;Panagiotou, A.;Foudas, C.;Loukas, N.;Karancsi, J.;Mal, P.;Singh, J. B.;Chatterjee, K.;Mohanty, A. K.;Topkar, A.;Bhowmik, S.;Dugad, S.;Majumder, G.;Safarzadeh, B.;Abbrescia, M.;De Palma, M.;Navarria, F. L.;Barbagli, G.;Buontempo, S.;Paolucci, P.;Checchia, P.;Ronchese, P.;Tosi, M.;Zucchetta, A.;Alunni Solestizi, L.;Giassi, A.;D’imperio, G.;Arcidiacono, R.;La Licata, C.;Marone, M.;Choi, Y.;Juodagalvis, A.;Kazana, M.;Perelygin, V.;Sulimov, V.;Gavrilov, V.;Mesyats, G.;Belyaev, A.;Vila, I.;Mersi, S.;Neugebauer, H.;Sakulin, H.;Sharma, A.;Silva, P.;Rossini, M.;Yu, S. S.;Akin, I. V.;Gülmez, E.;Yetkin, E. A.;Buchmuller, O.;Lucas, R.;Lyons, L.;Rohlf, J.;Zou, D.;Breedon, R.;Chertok, M.;Shalhout, S.;Bravo, C.;Pieri, M.;Jensen, F.;Wagner, S. R.;Berryhill, J.;Gottschalk, E.;Jung, A. W.;Mrenna, S.;Weber, H. A.;Thomas, L.;Adams, J. R.;Diamond, B.;Clarida, W.;Tiras, E.;Yi, K.;Swartz, M.;Jabeen, S.;Mcginn, C.;Bloom, K.;Mucia, N.;Pollack, B.;Trovato, M.;Brinson, J.;Neumeister, N.;Cowden, C.;Carlsmith, D.
贡献者:	理學院物理學系
关键词:	PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
日期:	2016-03-22
上传时间:	2026-04-23 13:02:50 (UTC+8)
出版者:	United States: American Physical Society
摘要:	摘要： In this study, a search for evidence of particle dark matter (DM) and unparticle production at the LHC has been performed using events containing two charged leptons, consistent with the decay of a Z boson, and large missing transverse momentum. This study is based on data collected with the CMS detector corresponding to an integrated luminosity of 19.7 fb–1 of pp collisions at the LHC at a center-of-mass energy of 8 TeV. No significant excess of events is observed above the number expected from the standard model contributions. The results are interpreted in terms of 90% confidence level limits on the DM-nucleon scattering cross section, as a function of the DM particle mass, for both spin-dependent and spin-independent scenarios. Limits are set on the effective cutoff scale Lambda, and on the annihilation rate for DM particles, assuming that their branching fraction to quarks is 100%. Additionally, the most stringent 95% confidence level limits to date on the unparticle model parameters are obtained. 出版者： United States: American Physical Society 出版日期： 2016-03-22 出處： Physical review. D, 2016-03, Vol.93 (5), Article 052011 識別號： ISSN: 2470-0010 識別號： EISSN: 2470-0029 識別號： DOI: 10.1103/PhysRevD.93.052011
显示于类别:	[物理學系] 期刊論文

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