Measurement of associated production of vector bosons and top quark-antiquark pairs in pp collisions at √s=7 TeV

被引：42

作者：

Chatrchyan, S. ^{[1
]}

Khachatryan, V. ^{[1
]}

Sirunyan, A. M. ^{[1
]}

Tumasyan, A. ^{[1
]}

Adam, W.

Aguilo, E. ^{[2
]}

Bergauer, T.

Dragicevic, M.

Eroe, J. ^{[2
]}

Fabjan, C. ^{[2
,184
]}

Friedl, M.

Fruehwirth, R. ^{[184
]}

Ghete, V. M.

Hoermann, N.

Hrubec, J. ^{[2
]}

Jeitler, M. ^{[184
]}

Kiesenhofer, W.

Knuenz, V.

Krammer, M. ^{[184
]}

Kraetschmer, I. ^{[2
]}

Liko, D. ^{[2
]}

Mikulec, I. ^{[2
]}

Pernicka, M.

Rabady, D. ^{[2
,118
]}

Rahbaran, B. ^{[2
]}

Rohringer, C. ^{[2
]}

Rohringer, H. ^{[2
]}

Schoefbeck, R.

Strauss, J.

Taurok, A. ^{[2
]}

Waltenberger, W.

Wulz, C. -E. ^{[2
,184
]}

Mossolov, V. ^{[3
]}

Shumeiko, N. ^{[3
]}

Gonzalez, J. Suarez ^{[3
]}

Alderweireldt, S. ^{[4
]}

Bansal, M. ^{[4
]}

Bansal, S. ^{[4
]}

Cornelis, T. ^{[4
]}

De Wolf, E. A. ^{[4
]}

Janssen, X. ^{[4
]}

Luyckx, S. ^{[4
]}

Mucibello, L. ^{[4
]}

Ochesanu, S. ^{[4
]}

Roland, B. ^{[4
]}

Rougny, R. ^{[4
]}

Selvaggi, M. ^{[4
]}

Van Haevermaet, H. ^{[4
]}

Van Mechelen, P. ^{[4
]}

Van Remortel, N. ^{[4
]}

机构：

[1] Yerevan Phys Inst, Yerevan 375036, Armenia

[2] OeAW, Inst Hochenergiephys, Vienna, Austria

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

[4] Univ Antwerp, Antwerp, Belgium

[5] Vrije Univ Brussel, Brussels, Belgium

[6] Univ Libre Bruxelles, Brussels, Belgium

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

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

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

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

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

[12] Univ Estadual Paulista, Sao Paulo, Brazil

[13] Univ Fed ABC, 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 & Technol, 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, Lab Leprince Ringuet, IN2P3, F-91128 Palaiseau, France

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

[32] Univ Lyon 1, CNRS, IN2P3, Inst Phys Nucl Lyon, Villeurbanne, France

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

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

[35] Rhein Westfal TH Aachen, Phys Inst A 3, D-52062 Aachen, Germany

[36] Rhein Westfal TH Aachen, Phys Inst B 3, D-52062 Aachen, Germany

[37] DESY, Hamburg, Germany

[38] Univ Hamburg, Hamburg, Germany

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

[40] NCSR Demokritos, INPP, Aghia Paraskevi, Greece

[41] Univ Athens, Athens, Greece

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

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

[44] Inst Nucl Res ATOMKI, Debrecen, Hungary

[45] Univ Debrecen, H-4012 Debrecen, Hungary

[46] Panjab Univ, Chandigarh 160014, India

[47] Univ Delhi, Delhi 110007, India

[48] Saha Inst Nucl Phys, Kolkata, India

[49] Bhabha Atom Res Ctr, Mumbai 400085, Maharashtra, India

[50] Tata Inst Fundamental Res EHEP, Mumbai, Maharashtra, India

来源：

PHYSICAL REVIEW LETTERS | 2013年 / 110卷 / 17期

基金：

巴西圣保罗研究基金会; 美国国家科学基金会; 芬兰科学院;

关键词：

Tellurium compounds - Uncertainty analysis;

D O I：

10.1103/PhysRevLett.110.172002

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

The first measurement of vector-boson production associated with a top quark-antiquark pair in proton-proton collisions at root s = 7 TeV is presented. The results are based on a data set corresponding to an integrated luminosity of 5.0 fb(-1), recorded by the CMS detector at the LHC in 2011. The measurement is performed in two independent channels through a trilepton analysis of t (t) over barZ events and a same-sign dilepton analysis of t (t) over barV (V = W or Z) events. In the trilepton channel a direct measurement of the t (t) over barZ cross section sigma(t (t) over barZ) = 0.28(-0.11)(+0.14) (stat)(-0.03)(+0.06) (syst) pb is obtained. In the dilepton channel a measurement of the t (t) over barV cross section yields sigma(t (t) over barV) = 0.43(-0.15)(+0.17) (stat)(-0.07)(+0.09) (syst) pb. These measurements have a significance, respectively, of 3.3 and 3.0 standard deviations from the background hypotheses and are compatible, within uncertainties, with the corresponding next-to-leading order predictions of 0.137(-0.016)(+0.012) and 0.306(-0.053)(+0.031) pb. DOI: 10.1103/PhysRevLett.110.172002

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