Search for narrow resonances in dilepton mass spectra in pp collisions at √s=7 TeV CMS Collaboration

被引：81

作者：

Chatrchyan, S. ^{[2
]}

Khachatryan, V. ^{[2
]}

Sirunyan, A. M. ^{[2
]}

Tumasyan, A. ^{[2
]}

Adam, W. ^{[3
]}

Bergauer, T. ^{[3
]}

Dragicevic, M. ^{[3
]}

Eroe, J. ^{[3
]}

Fabjan, C. ^{[3
]}

Friedl, M. ^{[3
]}

Fruehwirth, R. ^{[3
]}

Ghete, V. M. ^{[3
]}

Hammer, J. ^{[3
]}

Hoermann, N. ^{[3
]}

Hrubec, J. ^{[3
]}

Jeitler, M. ^{[3
]}

Kiesenhofer, W. ^{[3
]}

Knuenz, V. ^{[3
]}

Krammer, M. ^{[3
]}

Liko, D. ^{[3
]}

Mikulec, I. ^{[3
]}

Pernicka, M. ^{[3
]}

Rahbaran, B. ^{[3
]}

Rohringer, C. ^{[3
]}

Rohringer, H. ^{[3
]}

Schoefbeck, R. ^{[3
]}

Strauss, J. ^{[3
]}

Taurok, A. ^{[3
]}

Wagner, R. ^{[3
]}

Waltenberger, W. ^{[3
]}

Walzel, G. ^{[3
]}

Widl, E. ^{[3
]}

Wulz, C. -E. ^{[3
]}

Mossolov, V. ^{[4
]}

Shumeiko, N. ^{[4
]}

Gonzalez, J. Suarez ^{[4
]}

Bansal, S. ^{[5
]}

Cornelis, T. ^{[5
]}

De Wolf, E. A. ^{[5
]}

Janssen, X. ^{[5
]}

Luyckx, S. ^{[5
]}

Maes, T. ^{[5
]}

Mucibello, L. ^{[5
]}

Ochesanu, S. ^{[5
]}

Roland, B. ^{[5
]}

Rougny, R. ^{[5
]}

Selvaggi, M. ^{[5
]}

Staykova, Z. ^{[5
]}

Van Haevermaet, H. ^{[5
]}

Van Mechelen, P. ^{[5
]}

机构：

[1] CERN, European Org Nucl Res, CH-1211 Geneva, Switzerland

[2] Yerevan Phys Inst, Yerevan 375036, Armenia

[3] Inst Hochenergiephys OeAW, Vienna, Austria

[4] Natl Ctr Particle & High Energy Phys, Minsk, BELARUS

[5] Univ Antwerp, B-2020 Antwerp, Belgium

[6] Vrije Univ Brussel, Brussels, Belgium

[7] Univ Libre Bruxelles, Brussels, Belgium

[8] Univ Ghent, B-9000 Ghent, Belgium

[9] Catholic Univ Louvain, B-1348 Louvain, Belgium

[10] Univ Mons, B-7000 Mons, Belgium

[11] Ctr Brasileiro Pesquisas Fis, Rio De Janeiro, Brazil

[12] Univ Estado Rio de Janeiro, BR-20550011 Rio De Janeiro, Brazil

[13] Univ Estadual Paulista, Inst Fis Teor, BR-01405 Sao Paulo, Brazil

[14] Bulgarian Acad Sci, Inst Nucl Res & Nucl Energy, Sofia, Bulgaria

[15] Univ Sofia, BU-1126 Sofia, Bulgaria

[16] Inst High Energy Phys, Beijing 100039, Peoples R China

[17] Peking Univ, State Key Lab Nucl Phys & Tech, Beijing 100871, Peoples R China

[18] Univ Los Andes, Bogota, Colombia

[19] Tech Univ Split, Split, Croatia

[20] Univ Split, Split, Croatia

[21] Rudjer Boskovic Inst, Zagreb, Croatia

[22] Univ Cyprus, Nicosia, Cyprus

[23] Charles Univ Prague, Prague, Czech Republic

[24] Acad Sci Res & Technol Arab Republ Egypt, Egyptian Network High Energy Phys, Cairo, Egypt

[25] NICPB, Tallinn, Estonia

[26] Univ Helsinki, Dept Phys, Helsinki, Finland

[27] Helsinki Inst Phys, Helsinki, Finland

[28] Lappeenranta Univ Technol, Lappeenranta, Finland

[29] CEA Saclay, DSM IRFU, F-91191 Gif Sur Yvette, France

[30] Ecole Polytech, CNRS, IN2P3, Lab Leprince Ringuet, F-91128 Palaiseau, France

[31] Univ Haute Alsace Mulhouse, Univ Strasbourg, CNRS, Inst Pluridisciplinaire Hubert Curien,IN2P3, Strasbourg, France

[32] IN2P3, Ctr Calcul, Villeurbanne, France

[33] Univ Lyon 1, CNRS, Inst Phys Nucl Lyon, IN2P3, F-69622 Villeurbanne, France

[34] Tbilisi State Univ, Inst High Energy Phys & Informatizat, GE-380086 Tbilisi, Georgia

[35] Rhein Westfal TH Aachen, Inst Phys 1, Aachen, Germany

[36] Rhein Westfal TH Aachen, Phys Inst A 3, Aachen, Germany

[37] Rhein Westfal TH Aachen, Phys Inst B 3, Aachen, Germany

[38] DESY, Hamburg, Germany

[39] Univ Hamburg, Hamburg, Germany

[40] Univ Karlsruhe, Inst Expt Kernphys, D-7500 Karlsruhe, Germany

[41] Inst Nucl Phys Demokritos, Aghia Paraskevi, Greece

[42] Univ Athens, Athens, Greece

[43] Univ Ioannina, GR-45110 Ioannina, Greece

[44] KFKI Res Inst Particle & Nucl Phys, Budapest, Hungary

[45] Inst Nucl Res ATOMKI, Debrecen, Hungary

[46] Univ Debrecen, Debrecen, Hungary

[47] Panjab Univ, Chandigarh 160014, India

[48] Univ Delhi, Delhi 110007, India

[49] Saha Inst Nucl Phys, Kolkata, India

[50] Bhabha Atom Res Ctr, Bombay 400085, Maharashtra, India

来源：

PHYSICS LETTERS B | 2012年 / 714卷 / 2-5期

基金：

欧洲研究理事会; 巴西圣保罗研究基金会; 芬兰科学院; 美国国家科学基金会;

关键词：

CMS; Dileptons; Resonances; FERMION-PAIR PRODUCTION; E(+)E(-) COLLISIONS; CONSTRAINTS; PHYSICS; HADRON;

D O I：

10.1016/j.physletb.2012.06.051

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

A search for narrow, high-mass resonances decaying to electron or muon pairs has been performed using pp collision data collected at root s = 7 TeV by the CMS experiment in 2011. The data sample corresponds to an integrated luminosity of approximately 5 fb(-1). The event yields observed in the signal regions are consistent with predictions of the standard model backgrounds, and upper limits on the cross section times branching fraction for a resonance decaying to dileptons are extracted from a shape analysis of the dilepton invariant mass distribution. The resulting mass limits at 95% confidence level are 2330 GeV for the Z' in the Sequential Standard Model, 2000 GeV for the superstring-inspired Z'(psi) resonance, 890 (540) GeV for the Stueckelberg extension Z'(St) the mass parameter epsilon = 0.06 (0.04), and 2140 (1810) GeV for Kaluza-Klein gravitons with the coupling parameter k/(M) over bar (Pl) of 0.10 (0.05). These limits are the most stringent to date. (C) 2012 Elsevier B.V. All rights reserved.

引用

页码：158 / 179

页数：22

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