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Observation of Single Top Quark Production in Association with a Z Boson in Proton-Proton Collisions at root s=13 TeV

Sirunyan, A. M. and Tumasyan, A. and Adam, W. and Ambrogi, F. and Asilar, E. and Bergauer, T. and Brandstetter, J. and Dragicevic, M. and Eroe, J. and Del Valle, A. Escalante and Flechl, M. and Fruehwirth, R. and Ghete, V. M. and Hrubec, J. and Jeitler, M. and Krammer, N. and Kraetschmer, I and Liko, D. and Madlener, T. and Mikulec, I and Rad, N. and Rohringer, H. and Schieck, J. and Schoefbeck, R. and Spanring, M. and Spitzbart, D. and Waltenberger, W. and Wittmann, J. and Wulz, C-E and Zarucki, M. and Chekhovsky, V and Mossolov, V and Gonzalez, J. Suarez and De Wolf, E. A. and Di Croce, D. and Janssen, X. and Lauwers, J. and Lelek, A. and Pieters, M. and Van Haevermaet, H. and Van Mechelen, P. and Van Remortel, N. and Blekman, F. and D'Hondt, J. and De Clercq, J. and Deroover, K. and Flouris, G. and Lontkovskyi, D. and Lowette, S. and Marchesini, I and Moortgat, S. and Moreels, L. and Python, Q. and Skovpen, K. and Tavernier, S. and Van Doninck, W. and Van Mulders, P. and Van Parijs, I and Beghin, D. and Bilin, B. and Brun, H. and Clerbaux, B. and De Lentdecker, G. and Delannoy, H. and Dorney, B. and Fasanella, G. and Favart, L. and Grebenyuk, A. and Kalsi, A. K. and Luetic, J. and Popov, A. and Postiau, N. and Starling, E. and Thomas, L. and Vander Velde, C. and Vanlaer, P. and Vannerom, D. and Wang, Q. and Cornelis, T. and Dobur, D. and Fagot, A. and Gul, M. and Khvastunov, I and Roskas, C. and Trocino, D. and Tytgat, M. and Verbeke, W. and Vermassen, B. and Vit, M. and Zaganidis, N. and Bondu, O. and Bruno, G. and Caputo, C. and David, P. and Delaere, C. and Delcourt, M. and Giammanco, A. and Krintiras, G. and Lemaitre, V and Magitteri, A. and Piotrzkowski, K. and Saggio, A. and Marono, M. Vidal and Vischia, P. and Zobec, J. and Alves, F. L. and Alves, G. A. and Correia Silva, G. and Hensel, C. and Moraes, A. and Pol, M. E. and Rebello Teles, P. and Belchior Batista Das Chagas, E. and Carvalho, W. and Chinellato, J. and Coelho, E. and Da Costa, E. M. and Da Silveira, G. G. and De Jesus Damiao, D. and De Oliveira Martins, C. and Fonseca De Souza, S. and Huertas Guativa, L. M. and Malbouisson, H. and Matos Figueiredo, D. and Melo De Almeida, M. and Mora Herrera, C. and Mundim, L. and Nogima, H. and Prado Da Silva, W. L. and Sanchez Rosas, L. J. and Santoro, A. and Sznajder, A. and Thiel, M. and Tonelli Manganote, E. J. and Torres Da Silva De Araujo, F. and Vilela Pereira, A. and Ahuja, S. and Bernardes, C. A. and Calligaris, L. and Fernandez Perez Tomei, T. R. and Gregores, E. M. and Mercadante, P. G. and Novaes, S. F. and Padula, Sandra S. and Aleksandrov, A. and Hadjiiska, R. and Iaydjiev, P. and Marinov, A. and Misheva, M. and Rodozov, M. and Shopova, M. and Sultanov, G. and Dimitrov, A. and Litov, L. and Pavlov, B. and Petkov, P. and Fang, W. and Gao, X. and Yuan, L. and Ahmad, M. and Bian, J. G. and Chen, G. M. and Chen, H. S. and Chen, M. and Chen, Y. and Jiang, C. H. and Leggat, D. and Liao, H. and Liu, Z. and Shaheen, S. M. and Spiezia, A. and Tao, J. and Yazgan, E. and Zhang, H. and Zhang, S. and Zhao, J. and Ban, Y. and Chen, G. and Levin, A. and Li, J. and Li, L. and Li, Q. and Mao, Y. and Qian, S. J. and Wang, D. and Wang, Y. and Avila, C. and Cabrera, A. and Carrillo Montoya, C. A. and Chaparro Sierra, L. F. and Florez, C. and Gonzalez Hernandez, C. F. and Segura Delgado, M. A. and Ruiz Alvarez, J. D. and Godinovic, N. and Lelas, D. and Puljak, I and Sculac, T. and Antunovic, Z. and Kovac, M. and Brigljevic, V and Ferencek, D. and Kadija, K. and Mesic, B. and Roguljic, M. and Starodumov, A. and Susa, T. and Ather, M. W. and Attikis, A. and Kolosova, M. and Mavromanolakis, G. and Mousa, J. and Nicolaou, C. and Ptochos, F. and Razis, P. A. and Rykaczewski, H. and Finger, M. and Finger, M. and Ayala, E. and Carrera Jarrin, E. and Abdalla, H. and Assran, Y. and Mohamed, A. and Bhowmik, S. and De Oliveira, A. Carvalho Antunes and Dewanjee, R. K. and Ehataht, K. and Kadastik, M. and Raidal, M. and Veelken, C. and Eerola, P. and Kirschenmann, H. and Pekkanen, J. and Voutilainen, M. and Havukainen, J. and Heikkila, J. K. and Jarvinen, T. and Karimaki, V and Kinnunen, R. and Lampen, T. and Lassila-Perini, K. and Laurila, S. and Lehti, S. and Linden, T. and Luukka, P. and Maenpaa, T. and Siikonen, H. and Tuominen, E. and Tuominiemi, J. and Tuuva, T. and Besancon, M. and Couderc, F. and Dejardin, M. and Denegri, D. and Faure, J. L. and Ferri, F. and Ganjour, S. and Givernaud, A. and Gras, P. and de Monchenault, G. Hamel and Jarry, P. and Leloup, C. and Locci, E. and Malcles, J. and Negro, G. and Rander, J. and Rosowsky, A. and Sahin, M. O. and Savoy-Navarro, A. and Titov, M. and Amendola, C. and Beaudette, F. and Busson, P. and Charlot, C. and Diab, B. and de Cassagnac, R. Granier and Kucher, I and Lobanov, A. and Blanco, J. Martin and Perez, C. Martin and Nguyen, M. and Ochando, C. and Ortona, G. and Paganini, P. and Rembser, J. and Salerno, R. and Sauvan, J. B. and Sirois, Y. and Leiton, A. G. Stahl and Zabi, A. and Zghiche, A. and Agram, J-L and Andrea, J. and Bloch, D. and Bourgatte, G. and Brom, J-M and Chabert, E. C. and Cherepanov, V and Collard, C. and Conte, E. and Fontaine, J-C and Gele, D. and Goerlach, U. and Jansova, M. and Le Bihan, A-C and Tonon, N. and Van Hove, P. and Gadrat, S. and Beauceron, S. and Bernet, C. and Boudoul, G. and Chanon, N. and Chierici, R. and Contardo, D. and Depasse, P. and El Mamouni, H. and Fay, J. and Gascon, S. and Gouzevitch, M. and Grenier, G. and Ille, B. and Lagarde, F. and Laktineh, I. B. and Lattaud, H. and Lethuillier, M. and Mirabito, L. and Perries, S. and Sordini, V and Touquet, G. and Vander Donckt, M. and Viret, S. and Khvedelidze, A. and Tsamalaidze, Z. and Autermann, C. and Feld, L. and Kiesel, M. K. and Klein, K. and Lipinski, M. and Preuten, M. and Rauch, M. P. and Schomakers, C. and Schulz, J. and Teroerde, M. and Wittmer, B. and Albert, A. and Erdmann, M. and Erdweg, S. and Esch, T. and Fischer, R. and Ghosh, S. and Hebbeker, T. and Heidemann, C. and Hoepfner, K. and Keller, H. and Mastrolorenzo, L. and Merschmeyer, M. and Meyer, A. and Millet, P. and Mukherjee, S. and Novak, A. and Pook, T. and Pozdnyakov, A. and Radziej, M. and Reithler, H. and Rieger, M. and Schmidt, A. and Sharma, A. and Teyssier, D. and Thueer, S. and Fluegge, G. and Hlushchenko, O. and Kress, T. and Mueller, T. and Nehrkorn, A. and Nowack, A. and Pistone, C. and Pooth, O. and Roy, D. and Sert, H. and Stahl, A. and Martin, M. Aldaya and Arndt, T. and Asawatangtrakuldee, C. and Babounikau, I and Bakhshiansohi, H. and Beernaert, K. and Behnke, O. and Behrens, U. and Martinez, A. Bermudez and Bertsche, D. and Bin Anuar, A. A. and Borras, K. and Botta, V and Campbell, A. and Connor, P. and Contreras-Campana, C. and Danilov, V and De Wit, A. and Defranchis, M. M. and Pardos, C. Diez and Damiani, D. Dominguez and Eckerlin, G. and Eichhorn, T. and Elwood, A. and Eren, E. and Gallo, E. and Geiser, A. and Luyando, J. M. Grados and Grohsjean, A. and Guthoff, M. and Haranko, M. and Harb, A. and Jomhari, N. Z. and Jung, H. and Kasemann, M. and Keaveney, J. and Kleinwort, C. and Knolle, J. and Kruecker, D. and Lange, W. and Lenz, T. and Leonard, J. and Lipka, K. and Lohmann, W. and Mankel, R. and Melzer-Pellmann, I-A and Meyer, A. B. and Meyer, M. and Missiroli, M. and Mittag, G. and Mnich, J. and Myronenko, V and Pflitsch, S. K. and Pitzl, D. and Raspereza, A. and Saibel, A. and Savitskyi, M. and Saxena, P. and Schuetze, P. and Schwanenberger, C. and Shevchenko, R. and Singh, A. and Tholen, H. and Turkot, O. and Vagnerini, A. and Van De Klundert, M. and Van Onsem, G. P. and Walsh, R. and Wen, Y. and Wichmann, K. and Wissing, C. and Zenaiev, O. and Aggleton, R. and Bein, S. and Benato, L. and Benecke, A. and Blobel, V and Dreyer, T. and Ebrahimi, A. and Garutti, E. and Gonzalez, D. and Gunnellini, P. and Haller, J. and Hinzmann, A. and Karavdina, A. and Kasieczka, G. and Klanner, R. and Kogler, R. and Kovalchuk, N. and Kurz, S. and Kutzner, V and Lange, J. and Marconi, D. and Multhaup, J. and Niedziela, M. and Niemeyer, C. E. N. and Nowatschin, D. and Perieanu, A. and Reimers, A. and Rieger, O. and Scharf, C. and Schleper, P. and Schumann, S. and Schwandt, J. and Sonneveld, J. and Stadie, H. and Steinbrueck, G. and Stober, F. M. and Stoever, M. and Vormwald, B. and Zoi, I and Akbiyik, M. and Barth, C. and Baselga, M. and Baur, S. and Berger, T. and Butz, E. and Caspart, R. and Chwalek, T. and De Boer, W. and Dierlamm, A. and El Morabit, K. and Faltermann, N. and Giffels, M. and Harrendorf, M. A. and Hartmann, F. and Husemann, U. and Katkov, I and Kudella, S. and Mitra, S. and Mozer, M. U. and Mueller, Th and Musich, M. and Quast, G. and Rabbertz, K. and Schroeder, M. and Shvetsov, I and Simonis, H. J. and Ulrich, R. and Weber, M. and Woehrmann, C. and Wolf, R. and Anagnostou, G. and Daskalakis, G. and Geralis, T. and Kyriakis, A. and Loukas, D. and Paspalaki, G. and Agapitos, A. and Karathanasis, G. and Kontaxakis, P. and Panagiotou, A. and Papavergou, I and Saoulidou, N. and Vellidis, K. and Bakas, G. and Kousouris, K. and Papakrivopoulos, I and Tsipolitis, G. and Evangelou, I and Foudas, C. and Gianneios, P. and Katsoulis, P. and Kokkas, P. and Mallios, S. and Manitara, K. and Manthos, N. and Papadopoulos, I and Paradas, E. and Strologas, J. and Triantis, F. A. and Tsitsonis, D. and Bartok, M. and Csanad, M. and Filipovic, N. and Major, P. and Mandal, K. and Mehta, A. and Nagy, M. and Pasztor, G. and Suranyi, O. and Veres, G. and Bencze, G. and Hajdu, C. and Horvath, D. and Hunyadi, A. and Sikler, F. and Vami, T. A. and Veszpremi, V. and Vesztergombi, G. and Beni, N. and Czellar, S. and Karancsi, J. and Makovec, A. and Molnar, J. and Szillasi, Z. and Raics, P. and Trocsanyi, Z. L. and Ujvari, B. and Choudhury, S. and Komaragiri, J. R. and Tiwari, P. C. and Bahinipati, S. and Kar, C. and Mal, P. and Nayak, A. and Chowdhury, S. Roy and Sahoo, D. K. and Swain, S. K. and Bansal, S. and Beri, S. B. and Bhatnagar, V and Chauhan, S. and Chawla, R. and Dhingra, N. and Gupta, R. and Kaur, A. and Kaur, M. and Kaur, S. and Kumari, P. and Lohan, M. and Meena, M. and Sandeep, K. and Sharma, S. and Singh, J. B. and Virdi, A. K. and Walia, G. and Bhardwaj, A. and Choudhary, B. C. and Garg, R. 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B. and Sur, N. and Verma, Ravindra Kumar and Banerjee, S. and Bhattacharya, S. and Chatterjee, S. and Das, P. and Guchait, M. and Jain, Sa and Karmakar, S. and Kumar, S. and Majumder, G. and Mazumdar, K. and Sahoo, N. and Chauhan, S. and Dube, S. and Hegde, V and Kapoor, A. and Kothekar, K. and Pandey, S. and Rane, A. and Rastogi, A. and Sharma, S. and Chenarani, S. and Tadavani, E. Eskandari and Etesami, S. M. and Khakzad, M. and Najafabadi, M. Mohammadi and Naseri, M. and Hosseinabadi, F. 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Official URL: https://dx.doi.org/10.1103/PhysRevLett.122.132003

Abstract

The observation of single top quark production in association with a Z boson and a quark (tZq) is reported. Events from proton-proton collisions at a center-of-mass energy of 13 TeV containing three charged leptons (either electrons or muons) and at least two jets are analyzed. The data were collected with the CMS detector in 2016 and 2017 and correspond to an integrated luminosity of 77.4fb(-1). The increased integrated luminosity, a multivariate lepton identification, and a redesigned analysis strategy improve significantly the sensitivity of the analysis compared to previous searches for tZq production. The tZq signal is observed with a significance well over 5 standard deviations. The measured tZq production cross section is sigma(pp -> tZq -> tl(+) l(-) q) = 111 +/- 13 (stat)(-9)(+11) (syst) fb, for dilepton invariant masses above 30 GeV, in agreement with the standard model expectation.

Item Type: Journal Article
Publication: PHYSICAL REVIEW LETTERS
Publisher: AMER PHYSICAL SOC
Additional Information: The copyright for this article belongs to AMER PHYSICAL SOC
Department/Centre: Division of Physical & Mathematical Sciences > Centre for High Energy Physics
Date Deposited: 29 May 2019 07:22
Last Modified: 29 May 2019 07:22
URI: http://eprints.iisc.ac.in/id/eprint/62543

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