Evidence for WW production from double-parton interactions in proton-proton collisions at √s=13 TeV

被引:0
作者
Sirunyan, A. M. [1 ]
Tumasyan, A. [1 ]
Adam, W. [2 ]
Ambrogi, F. [2 ]
Bergauer, T. [2 ]
Brandstetter, J. [2 ]
Dragicevic, M. [2 ]
Eroe, J. [2 ]
Del Valle, A. Escalante [2 ]
Flechl, M. [2 ]
Fruehwirth, R. [2 ,212 ]
Jeitler, M. [2 ,212 ]
Krammer, N. [2 ]
Kraetschmer, I [2 ]
Liko, D. [2 ]
Madlener, T. [2 ]
Mikulec, I [2 ]
Rad, N. [2 ]
Schieck, J. [2 ,212 ]
Schoefbeck, R. [2 ]
Spanring, M. [2 ]
Spitzbart, D. [2 ]
Waltenberger, W. [2 ]
Wulz, C-E [2 ,212 ]
Zarucki, M. [2 ]
Drugakov, V [3 ]
Mossolov, V [3 ]
Gonzalez, J. Suarez [3 ]
Darwish, M. R. [4 ]
De Wolf, E. A. [4 ]
Di Croce, D. [4 ]
Janssen, X. [4 ]
Lauwers, J. [4 ]
Lelek, A. [4 ]
Pieters, M. [4 ]
Sfar, H. Rejeb [4 ]
Van Haevermaet, H. [4 ]
Van Mechelen, P. [4 ]
Van Putte, S. [4 ]
Van Remortel, N. [4 ]
Blekman, F. [5 ]
Bols, E. S. [5 ]
Chhibra, S. S. [5 ]
D'Hondt, J. [5 ]
De Clercq, J. [5 ]
Lontkovskyi, D. [5 ]
Lowette, S. [5 ]
Marchesini, I [5 ]
Moortgat, S. [5 ]
Moreels, L. [5 ]
机构
[1] Yerevan Phys Inst, Yerevan, Armenia
[2] Inst Hochenergiephys, Vienna, Austria
[3] Inst Nucl Problems, Minsk, BELARUS
[4] Univ Antwerp, Antwerp, Belgium
[5] Vrije Univ Brussel, Brussels, Belgium
[6] Univ Libre Bruxelles, Brussels, Belgium
[7] Univ Ghent, Ghent, Belgium
[8] Catholic Univ Louvain, Louvain La Neuve, Belgium
[9] Ctr Brasileiro Pesquisas Fis, Rio De Janeiro, Brazil
[10] Univ Estado Rio de Janeiro, Rio De Janeiro, Brazil
[11] Univ Estadual Paulista, Sao Paulo, Brazil
[12] Univ Fed ABC, Sao Paulo, Brazil
[13] Bulgarian Acad Sci, Inst Nucl Res & Nucl Energy, Sofia, Bulgaria
[14] Univ Sofia, Sofia, Bulgaria
[15] Beihang Univ, Beijing, Peoples R China
[16] Inst High Energy Phys, Beijing, Peoples R China
[17] Peking Univ, State Key Lab Nucl Phys & Technol, Beijing, Peoples R China
[18] Tsinghua Univ, Beijing, Peoples R China
[19] Univ Los Andes, Bogota, Colombia
[20] Univ Antioquia, Medellin, Colombia
[21] Univ Split, Fac Elect Engn Mech Engn & Naval Architecture, Split, Croatia
[22] Univ Split, Fac Sci, Split, Croatia
[23] Inst Rudjer Boskovic, Zagreb, Croatia
[24] Univ Cyprus, Nicosia, Cyprus
[25] Charles Univ Prague, Prague, Czech Republic
[26] Escuela Politec Nacl, Quito, Ecuador
[27] Univ San Francisco Quito, Quito, Ecuador
[28] Acad Sci Res & Technol Arab Republ Egypt, Egyptian Network High Energy Phys, Cairo, Egypt
[29] NICPB, Tallinn, Estonia
[30] Univ Helsinki, Dept Phys, Helsinki, Finland
[31] Helsinki Inst Phys, Helsinki, Finland
[32] Lappeenranta Univ Technol, Lappeenranta, Finland
[33] Univ Paris Saclay, CEA, IRFU, Gif Sur Yvette, France
[34] Inst Polytech Paris, Lab Leprince Ringuet, Ecole Polytech, IN2P3,CNRS, Palaiseau, France
[35] Univ Strasbourg, CNRS, IPHC UMR 7178, Strasbourg, France
[36] Inst Natl Phys Nucl & Phys Particules, IN2P3, CNRS, Ctr Calcul, Villeurbanne, France
[37] Univ Lyon, Univ Claude Bernard Lyon 1, Inst Phys Nucl Lyon, IN2P3,CNRS, Villeurbanne, France
[38] Georgian Tech Univ, Tbilisi, Georgia
[39] Tbilisi State Univ, Tbilisi, Georgia
[40] Rhein Westfal TH Aachen, Phys Inst 1, Aachen, Germany
[41] Rhein Westfal TH Aachen, Phys Inst A 3, Aachen, Germany
[42] Rhein Westfal TH Aachen, Phys Inst B 3, Aachen, Germany
[43] DESY, Hamburg, Germany
[44] Univ Hamburg, Hamburg, Germany
[45] Karlsruher Inst Technol, Karlsruhe, Germany
[46] NCSR Demokritos, INPP, Aghia Paraskevi, Greece
[47] Natl & Kapodistrian Univ Athens, Athens, Greece
[48] Natl Tech Univ Athens, Athens, Greece
[49] Univ Ioannina, Ioannina, Greece
[50] Eotvos Lorand Univ, MTA ELTE Lendulet CMS Particle & Nucl Phys Grp, Budapest, Hungary
来源
EUROPEAN PHYSICAL JOURNAL C | 2020年 / 80卷 / 01期
基金
芬兰科学院; 欧洲研究理事会; 巴西圣保罗研究基金会; 欧盟地平线“2020”;
关键词
CMS; Physics; WW production; (P)OVER-BAR-P COLLISIONS; MEASURING MASSES; PP COLLISIONS; SCATTERING; PHYSICS; EVENTS; SEARCH; PROBE; LHC;
D O I
10.1140/epjc/s10052-019-7541-6
中图分类号
O412 [相对论、场论]; O572.2 [粒子物理学];
学科分类号
摘要
A search forWWproduction from double-parton scattering processes using same-charge electron-muon and dimuon events is reported, based on proton-proton collision data collected at a center-of-mass energy of 13 TeV. The analyzed data set corresponds to an integrated luminosity of 77.4 fb-1, collected using the CMS detector at the LHC in 2016 and 2017. Multivariate classifiers are used to discriminate between the signal and the dominant background processes. A maximum likelihood fit is performed to extract the signal cross section. This leads to the first evidence for WW production via double-parton scattering, with a significance of 3.9 standard deviations. The measured inclusive cross section is 1.41 +/- 0.28 (stat) +/- 0.28 (syst) pb.
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页数:26
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