Search for the rare decay of the W boson into a pion and a photon in proton-proton collisions at s=13 TeV
Academic Article
Publication Date:
2021
abstract:
A search is performed for the rare decay W-+/--> pi(+/-)gamma in proton-proton collisions at root s = 13 TeV. Data corresponding to an integrated luminosity of 137 fb(-1) were collected during 2016 to 2018 with the CMS detector. This analysis exploits a novel search strategy based on W boson production in top quark pair events. An inclusive search for the W-+/--> pi(+/-)gamma decay is not optimal at the LHC because of the high trigger thresholds. Instead, a trigger selection is exploited in which the W boson originating from one of the top quarks is used to tag the event in a leptonic decay. The W boson emerging from the other top quark is used to search for the W-+/--> pi(+/-)gamma signature. Such decays are characterized by an isolated track pointing to a large energy deposit, and by an isolated photon of large transverse momentum. The presence of b quark jets reduces the background from the hadronization of light-flavor quarks and gluons. The W-+/- -> pi(+/-)gamma decay is not observed. An upper exclusion limit is set to this branching fraction, corresponding to 1.50 x 10(-5) at 95% confidence level, whereas the expected upper exclusion limit is 0.85(-0.29)(+0.52) x 10(-5). (C) 2021 The Author(s). Published by Elsevier B.V.
Iris type:
1.1 Articolo in rivista
Keywords:
CMS; Standard model; EWK
List of contributors:
Sirunyan, Am; Tumasyan, A; Adam, W; Bergauer, T; Dragicevic, M; Ero, J; Del Valle, Ae; Fruhwirth, R; Jeitler, M; Krammer, N; Lechner, L; Liko, D; Mikulec, I; Pitters, Fm; Rad, N; Schieck, J; Schofbeck, R; Spanring, ; Templ, S; Waltenberger, W; Wulz, Ce; Zarucki, M; Chekhovsky, V; Litomin, A; Makarenko, V; Gonzalez, Js; Darwish, Mr; De Wolf, Ea; Di Croce, D; Janssen, X; Kello, T; Lelek, A; Pieters, M; Sfar, Hr; Van Haevermaet, H; Van Mechelen, P; Van Putte, S; Van Remortel, N; Blekman, F; Bols, Es; Chhibra, Ss; D'Hondt, J; De Clercq, J; Lontkovskyi, D; Lowette, S; Marchesini, I; Moortgat, S; Morton, A; Python, Q; Tavernier, S; Van Doninck, W; Van Mulders, P; Beghin, D; Bilin, B; Clerbaux, B; De Lentdecker, G; Dorney, B; Favart, L; Grebenyuk, A; Kalsi, Ak; Makarenko, I; Moureaux, L; Popov, A; Postiau, N; Starling, E; Thomas, L; Vander Velde, C; Vanlaer, P; Vannerom, D; Wezenbeek, L; Petre, L; Cornelis, T; Dobur, D; Gruchala, M; Khvastunov, I; Niedziela, M; Roskas, C; Skovpen, K; Tytgat, M; Verbeke, W; Vermassen, B; Vit, M; Bruno, G; Bury, F; Caputo, C; David, P; Delaere, C; Delcourt, M; Donertas, Is; Giammanco, A; Lemaitre, V; Mondal, K; Prisciandaro, J; Taliercio, A; Teklishyn, M; Vischia, P; Wertz, S; Wuyckens, S; Alves, Ga; Hensel, C; Moraes, A; Alda, Wl; Das Chagas, Ebb; Malbouisson, Hb; Carvalho, W; Chinellato, J; Coelho, E; Da Costa, Em; Da Silveira, Gg; Damiao, Dd; De Souza, Sf; Martins, J; Figueiredo, Dm; Jaime, Mm; Herrera, Cm; Mundim, L; Nogima, H; Teles, Pr; Rosas, Ljs; Santoro, A; Do Amaral, Sms; Sznajder, A; Thiel, M; De Araujo, Ftd; Pereira, Av; Bernardes, Ca; Calligaris, L; Tomei, Trfp; Gregores, Em; Lemos, Ds; Mercadante, Pg; Novaes, Sf; Padula, Ss; Aleksandrov, A; Antchev, G; Atanasov, I; Hadjiiska, R; Iaydjiev, P; Misheva, M; Rodozov, M; Shopova, M; Sultanov, G; Dimitrov, A; Ivanov, T; Litov, L; Pavlov, B; Petkov, P; Petrov, A; Cheng, T; Fang, W; Guo, Q; Wang, H; Yuan, L; Ahmad, M; Bauer, G; Hu, Z; Wang, Y; Yi, K; Chapon, E; Chen, Gm; Chen, Hs; Chen, M; Javaid, T; Kapoor, A; Leggat, D; Liao, H; Liu, Za; Sharma, R; Spiezia, A; Tao, J; Thomas-wilsker, J; Wang, J; Zhang, H; Zhang, S; Zhao, J; Agapitos, A; Ban, Y; Chen, C; Huang, Q; Levin, A; Li, Q; Lu, M; Lyu, X; Mao, Y; Qian, Sj; Wang, D; Wang, Q; Xiao, J; You, Z; Gao, X; Xiao, M; Avila, C; Cabrera, A; Florez, C; Fraga, J; Sarkar, A; Delgado, Mas; Jaramillo, J; Guisao, Jm; Ramirez, F; Alvarez, Jdr; Gonzalez, Cas; Arbelaez, Nv; Giljanovic, D; Godinovic, N; Lelas, D; Puljak, I; Antunovic, Z; Kovac, M; Sculac, T; Brigljevic, V; Ferencek, D; Majumder, D; Roguljic, M; Starodumov, A; Susa, T; Ather, Mw; Attikis, A; Erodotou, E; Ioannou, A; Kole, G; Kolosova, M; Konstantinou, S; Mousa, J; Nicolaou, C; Ptochos, F; Razis, Pa; Rykaczewski, H; Saka, H; Tsiakkouri, D; Finger, M; Finger, Mf; Kveton, A; Tomsa, J; Ayala, E; Jarrin, Ec; Abdalla, H; Abdelalim, Aa; Elgammal, S; Lotfy, A; Mahmoud, Ma; Bhowmik, S; De Oliveira, Aca; Dewanjee, Rk; Ehataht, K; Kadastik, M; Raidal, M; Veelken, C; Eerola, R; Forthomme, L; Kirschenmann, H; Osterberg, K; Voutilainen, M; Brucken, E; Garcia, F; Havukainen, J; Karimaki, V; Kim, Ms; Kinnunen, R; Lampen, T; Lassila-Perini, K; Lehti, S; Linden, T; Siikonen, H; Tuominen, E; Tuominiemi, J; Luukka, R; Tuuva, T; Amendola, C; Besancon, M; Couderc, F; Dejardin, M; Denegri, D; Faure, Jl; Ferri, F; Ganjour, S; Givernaud, A; Gras, P; de Monchenault, Gh; Jarry, P; Lenzi, B; Locci, E; Malcles, J; Rander, J; Rosowsky, A; Savoy-Navarro, A; Titov, M; Yu, Gb; Ahuja, S; Beaudette, F; Bonanomi, M; Perraguin, Ab; Busson, P; Charlot, C; Davignon, O; Diab, B; Falmagne, G; de Cassagnac, Rg; Hakimi, A; Kucher, I; Lobanov, A; Perez, Cm; Nguyen, M; Ochando, C; Paganini, P; Rembser, J; Salerno, R; Sauvan, Jb; Sirois, Y; Zabi, A; Zghiche, A; Agram, Jl; Andrea, J; Bloch, D; Bourgatte, G; Brom, Jm; Chabert, Ec; Collard, C; Fontaine, Jc; Goerlach, U; Grimault, C; Le Bihan, Ac; Van Hove, P; Gele, D; Asilar, E; Beauceron, S; Bernet, C; Boudoul, G; Camen, C; Carle, A; Chanon,
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