Search for baryon number violation in top-quark decays

被引：11

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
,188
]}

Friedl, M. ^{[3
]}

Fruehwirth, R. ^{[3
,188
]}

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

Hoermann, N. ^{[3
]}

Hrubec, J. ^{[3
]}

Jeitler, M. ^{[3
,188
]}

Kiesenhofer, W. ^{[3
]}

Knuetz, V. ^{[3
]}

Krammer, M. ^{[3
,188
]}

Kraetschmer, I. ^{[3
]}

Liko, D. ^{[3
]}

Mikulec, I. ^{[3
]}

Rabady, D. ^{[3
,122
]}

Rahbaran, B. ^{[3
]}

Rohringer, C. ^{[3
]}

Rohringer, H. ^{[3
]}

Schoefbeck, R. ^{[3
]}

Strauss, J. ^{[3
]}

Taurok, A. ^{[3
]}

Treberer-Treberspurg, W. ^{[3
]}

Waltenberger, W. ^{[3
]}

Wulz, C. -E. ^{[3
,188
]}

Mossolov, V. ^{[4
]}

Shumeiko, N. ^{[4
]}

Gonzalez, J. Suarez ^{[4
]}

Alderweireldt, S. ^{[5
]}

Bansal, M. ^{[5
]}

Bansal, S. ^{[5
]}

Cornelis, T. ^{[5
]}

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

Janssen, X. ^{[5
]}

Knutsson, A. ^{[5
]}

Luyckx, S. ^{[5
]}

Mucibello, L. ^{[5
]}

Ochesanu, S. ^{[5
]}

Roland, B. ^{[5
]}

Rougny, R. ^{[5
]}

Staykova, Z. ^{[5
]}

Van Haevermaet, H. ^{[5
]}

Van Mechelen, P. ^{[5
]}

Van Remortel, N. ^{[5
]}

机构：

[1] CERN, CH-1211 Geneva 23, 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, Sao Paulo, Brazil

[14] Univ Fed ABC, Sao Paulo, Brazil

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

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

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

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

[19] Univ Los Andes, Bogota, Colombia

[20] Tech Univ Split, Split, Croatia

[21] Univ Split, Split, Croatia

[22] Rudjer Boskovic Inst, Zagreb, Croatia

[23] Univ Cyprus, Nicosia, Cyprus

[24] Charles Univ Prague, Prague, Czech Republic

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

[26] NICPB, Tallinn, Estonia

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

[28] Helsinki Inst Phys, Helsinki, Finland

[29] Lappeenranta Univ Technol, Lappeenranta, Finland

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

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

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

[33] Inst Natl Phys Nucl & Phys Particules, Ctr Calcul, CNRS IN2P3, Villeurbanne, France

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

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

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

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

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

[39] DESY, Hamburg, Germany

[40] Univ Hamburg, Hamburg, Germany

[41] Univ Karlsruhe, Inst Expt Kernphys, Karlsruhe, Germany

[42] NCSR Demokritos, Inst Nucl & Particle Phys, Aghia Paraskevi, Greece

[43] Univ Athens, Athens, Greece

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

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

[46] Inst Nucl Res ATOMKI, Debrecen, Hungary

[47] Univ Debrecen, Debrecen, Hungary

[48] Natl Inst Sci Educ & Res, Bhubaneswar, Orissa, India

[49] Panjab Univ, Chandigarh 160014, India

[50] Univ Delhi, Delhi 110007, India

来源：

PHYSICS LETTERS B | 2014年 / 731卷

基金：

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

关键词：

LHC; CMS; Top quark; Baryon number; PARTON DISTRIBUTIONS; LEPTON;

D O I：

10.1016/j.physletb.2014.02.033

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

A search for baryon number violation (BNV) in top-quark decays is performed using pp collisions produced by the LHC at root s = 8 TeV. The top-quark decay considered in this search results in one light lepton (muon or electron), two jets, but no neutrino in the final state. Data used for the analysis were collected by the CMS detector and correspond to an integrated luminosity of 19.5 fb(-1). The event selection is optimized for top quarks produced in pairs, with one undergoing the BNV decay and the other the standard model hadronic decay to three jets. No significant excess of events over the expected yield from standard model processes is observed. The upper limits at 95% confidence level on the branching fraction of the BNV top-quark decay are calculated to be 0.0016 and 0.0017 for the muon and the electron channels, respectively. Assuming lepton universality, an upper limit of 0.0015 results from the combination of the two channels. These limits are the first that have been obtained on a BNV process involving the top quark. (C) 2014 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY license

引用

页码：173 / 196

页数：24

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