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Evidence for light-by-light scattering and searches for axion-like particles in ultraperipheral PbPb collisions at √sNN = 5.02 TeV

Sirunyan, AM and Tumasyan, A and Adam, W and Ambrogi, F and Asilar, E and Bergauer, T and Brandstetter, J and Dragicevic, M and Erö, J and Escalante Del Valle, A and Flechl, M and Frühwirth, R and Ghete, VM and Hrubec, J and Jeitler, M and Krammer, N and Krätschmer, I and Liko, D and Madlener, T and Mikulec, I and Rad, N and Rohringer, H and Schieck, J and Schöfbeck, R and Spanring, M and Spitzbart, D and Taurok, A and Waltenberger, W and Wittmann, J and Wulz, C-E and Zarucki, M and Chekhovsky, V and Mossolov, V and Suarez Gonzalez, J and De Wolf, EA and Di Croce, D and Janssen, X and Lauwers, J and Pieters, M and Van Haevermaet, H and Van Mechelen, P and Van Remortel, N and Abu Zeid, S and Blekman, F and D'Hondt, J and De Bruyn, I 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 Goldouzian, R and Grebenyuk, A and Kalsi, AK and Lenzi, T and Luetic, J 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 Poyraz, D and Roskas, C and Trocino, D and Tytgat, M and Verbeke, W and Vermassen, B and Vit, M and Zaganidis, N and Bakhshiansohi, H and Bondu, O and Brochet, S and Bruno, G and Caputo, C and David, P and Delaere, C and Delcourt, M and Francois, B and Giammanco, A and Krintiras, G and Lemaitre, V and Magitteri, A and Mertens, A and Musich, M and Piotrzkowski, K and Saggio, A and Vidal Marono, M and Wertz, S and Zobec, J and Alves, FL and Alves, GA and Correa Martins Junior, M and Correia Silva, G and Hensel, C and Moraes, A and Pol, ME and Rebello Teles, P and Belchior Batista Das Chagas, E and Carvalho, W and Chinellato, J and Coelho, E and Da Costa, EM and Da Silveira, GG and De Jesus Damiao, D and De Oliveira Martins, C and Fonseca De Souza, S 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, WL and Sanchez Rosas, LJ and Santoro, A and Sznajder, A and Thiel, M and Tonelli Manganote, EJ and Torres Da Silva De Araujo, F and Vilela Pereira, A and Ahuja, S and Bernardes, CA and Calligaris, L and Fernandez Perez Tomei, TR and Gregores, EM and Mercadante, PG and Novaes, SF and Padula, SS 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, JG and Chen, GM and Chen, HS and Chen, M and Chen, Y and Jiang, CH and Leggat, D and Liao, H and Liu, Z and Romeo, F and Shaheen, SM and Spiezia, A and Tao, J and Wang, Z 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, SJ and Wang, D and Xu, Z and Wang, Y and Avila, C and Cabrera, A and Carrillo Montoya, CA and Chaparro Sierra, LF and Florez, C and González Hernández, CF and Segura Delgado, MA and Courbon, B 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 Starodumov, A and Susa, T and Ather, MW and Attikis, A and Kolosova, M and Mavromanolakis, G and Mousa, J and Nicolaou, C and Ptochos, F and Razis, PA and Rykaczewski, H and Finger, M and Ayala, E and Carrera Jarrin, E and Ellithi Kamel, A and Mahmoud, MA and Mohammed, Y and Bhowmik, S and Carvalho Antunes De Oliveira, A and Dewanjee, RK 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 Heikkilä, JK and Järvinen, T and Karimäki, V and Kinnunen, R and Lampén, T and Lassila-Perini, K and Laurila, S and Lehti, S and Lindén, T and Luukka, P and Mäenpää, 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, JL and Ferri, F and Ganjour, S and Givernaud, A and Gras, P and Hamel de Monchenault, G and Jarry, P and Leloup, C and Locci, E and Malcles, J and Negro, G and Rander, J and Rosowsky, A and Sahin, MÃ� and Titov, M and Abdulsalam, A and Amendola, C and Antropov, I and Beaudette, F and Busson, P and Charlot, C and Granier de Cassagnac, R and Kucher, I and Lobanov, A and Martin Blanco, J and Martin Perez, C and Nguyen, M and Ochando, C and Ortona, G and Paganini, P and Pigard, P and Rembser, J and Salerno, R and Sauvan, JB and Sirois, Y and Stahl Leiton, AG and Zabi, A and Zghiche, A and Agram, J-L and Andrea, J and Bloch, D and Brom, J-M and Chabert, EC and Cherepanov, V and Collard, C and Conte, E and Fontaine, J-C and Gelé, D and Goerlach, U and Jansová, 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 Finco, L and Gascon, S and Gouzevitch, M and Grenier, G and Ille, B and Lagarde, F and Laktineh, IB and Lattaud, H and Lethuillier, M and Mirabito, L and Perries, S and Popov, A and Sordini, V and Touquet, G and Vander Donckt, M and Viret, S and Toriashvili, T and Tsamalaidze, Z and Autermann, C and Feld, L and Kiesel, MK and Klein, K and Lipinski, M and Preuten, M and Rauch, MP and Schomakers, C and Schulz, J and Teroerde, M and Wittmer, B and Zhukov, V and Albert, A and Duchardt, D and Endres, M and Erdmann, M and Ghosh, S and Güth, A 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 Pook, T and Radziej, M and Reithler, H and Rieger, M and Schmidt, A and Teyssier, D and Flügge, G and Hlushchenko, O and Kress, T and Künsken, A and Müller, T and Nehrkorn, A and Nowack, A and Pistone, C and Pooth, O and Roy, D and Sert, H and Stahl, A and Aldaya Martin, M and Arndt, T and Asawatangtrakuldee, C and Babounikau, I and Beernaert, K and Behnke, O and Behrens, U and Bermúdez Martínez, A and Bertsche, D and Bin Anuar, AA 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, MM and Diez Pardos, C and Domínguez Damiani, D and Eckerlin, G and Eichhorn, T and Elwood, A and Eren, E and Gallo, E and Geiser, A and Grohsjean, A and Guthoff, M and Haranko, M and Harb, A and Hauk, J and Jung, H and Kasemann, M and Keaveney, J and Kleinwort, C and Knolle, J and Krücker, D and Lange, W and Lelek, A and Lenz, T and Leonard, J and Lipka, K and Lohmann, W and Mankel, R and Melzer-Pellmann, I-A and Meyer, AB and Meyer, M and Missiroli, M and Mittag, G and Mnich, J and Myronenko, V and Pflitsch, SK and Pitzl, D and Raspereza, A and Savitskyi, M and Saxena, P and Schütze, P and Schwanenberger, C and Shevchenko, R and Singh, A and Tholen, H and Turkot, O and Vagnerini, A and Van Onsem, GP 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 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, CEN 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 Steinbrück, G and Stober, FM and Stöver, M and Vanhoefer, A and Vormwald, B and Zoi, I and Akbiyik, M and Barth, C and Baselga, M and Baur, S and Butz, E and Caspart, R and Chwalek, T and Colombo, F and De Boer, W and Dierlamm, A and El Morabit, K and Faltermann, N and Freund, B and Giffels, M and Harrendorf, MA and Hartmann, F and Heindl, SM and Husemann, U and Kassel, F and Katkov, I and Kudella, S and Mildner, H and Mitra, S and Mozer, MU and Müller, T and Plagge, M and Quast, G and Rabbertz, K and Schröder, M and Shvetsov, I and Sieber, G and Simonis, HJ and Ulrich, R and Wayand, S and Weber, M and Weiler, T and Williamson, S and Wöhrmann, C and Wolf, R and Anagnostou, G and Daskalakis, G and Geralis, T and Kyriakis, A and Loukas, D and Paspalaki, G and Topsis-Giotis, I and Karathanasis, G and Kesisoglou, S and Kontaxakis, P and Panagiotou, A and Papavergou, I and Saoulidou, N and Tziaferi, E and Vellidis, K 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 Manthos, N and Papadopoulos, I and Paradas, E and Strologas, J and Triantis, FA and Tsitsonis, D and Bartók, M and Csanad, M and Filipovic, N and Major, P and Nagy, MI and Pasztor, G and Surányi, O and Veres, GI and Bencze, G and Hajdu, C and Horvath, D and Hunyadi, Ã� and Sikler, F and Vámi, TÃ� 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, ZL and Ujvari, B and Choudhury, S and Komaragiri, JR and Tiwari, PC and Bahinipati, S and Kar, C and Mal, P and Mandal, K and Nayak, A and Sahoo, DK and Swain, SK and Bansal, S and Beri, SB 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 Kumar, R and Kumari, P and Lohan, M and Mehta, A and Sandeep, K and Sharma, S and Singh, JB and Virdi, AK and Walia, G and Bhardwaj, A and Choudhary, BC and Garg, RB and Gola, M and Keshri, S and Kumar, A and Malhotra, S and Naimuddin, M and Priyanka, P and Ranjan, K and Shah, A and Sharma, R and Bhardwaj, R and Bharti, M and Bhattacharya, R and Bhattacharya, S and Bhawandeep, U and Bhowmik, D and Dey, S and Dutt, S and Dutta, S and Mondal, K and Nandan, S and Purohit, A and Rout, PK and Roy, A and Roy Chowdhury, S and Saha, G and Sarkar, S and Sharan, M and Singh, B and Thakur, S and Behera, PK and Chudasama, R and Dutta, D and Jha, V and Kumar, V and Netrakanti, PK and Pant, LM and Shukla, P and Aziz, T and Bhat, MA and Dugad, S and Mohanty, GB and Sur, N and Sutar, B and Verma, RK and Banerjee, S and Chatterjee, S and Das, P and Guchait, M and Jain, S and Karmakar, S and Kumar, S and Maity, M and Majumder, G and Mazumdar, K and Sahoo, N and Sarkar, T and Dube, S and Hegde, V and Kapoor, A and Kothekar, K and Pandey, S and Rane, A and Chenarani, S and Eskandari Tadavani, E and Etesami, SM and Khakzad, M and Mohammadi Najafabadi, M and Naseri, M and Rezaei Hosseinabadi, F and Safarzadeh, B and Zeinali, M and Felcini, M and Grunewald, M and Abbrescia, M and Calabria, C and Colaleo, A and Creanza, D and Cristella, L and De Filippis, N and De Palma, M and Di Florio, A and Errico, F and Fiore, L and Gelmi, A and Iaselli, G and Ince, M and Lezki, S and Maggi, G and Maggi, M and Miniello, G and My, S and Nuzzo, S and Pompili, A and Pugliese, G and Radogna, R and Ranieri, A and Selvaggi, G and Sharma, A and Silvestris, L and Venditti, R and Verwilligen, P and Zito, G and Abbiendi, G and Battilana, C and Bonacorsi, D and Borgonovi, L and Braibant-Giacomelli, S and Campanini, R and Capiluppi, P and Castro, A and Cavallo, FR and Chhibra, SS and Ciocca, C and Codispoti, G and Cuffiani, M and Dallavalle, GM and Fabbri, F and Fanfani, A and Fontanesi, E and Giacomelli, P and Grandi, C and Guiducci, L and Lo Meo, S and Marcellini, S and Masetti, G and Montanari, A and Navarria, FL and Perrotta, A and Primavera, F and Rossi, AM and Rovelli, T and Siroli, GP and Tosi, N and Albergo, S and Di Mattia, A and Potenza, R and Tricomi, A and Tuve, C and Barbagli, G and Chatterjee, K and Ciulli, V and Civinini, C and D'Alessandro, R and Focardi, E and Latino, G and Lenzi, P and Meschini, M and Paoletti, S and Russo, L and Sguazzoni, G and Strom, D and Viliani, L and Benussi, L and Bianco, S and Piccolo, D and Ferro, F and Ravera, F and Robutti, E and Tosi, S and Benaglia, A and Beschi, A and Brianza, L and Brivio, F and Ciriolo, V and Di Guida, S and Dinardo, ME and Fiorendi, S and Gennai, S and Ghezzi, A and Govoni, P and Malberti, M and Malvezzi, S and Massironi, A and Menasce, D and Monti, F and Moroni, L and Paganoni, M and Pedrini, D and Ragazzi, S and Tabarelli de Fatis, T and Zuolo, D and Buontempo, S and Cavallo, N and Di Crescenzo, A and Fabozzi, F and Fienga, F and Galati, G and Iorio, AOM and Khan, WA and Lista, L and Meola, S and Paolucci, P and Sciacca, C and Voevodina, E and Azzi, P and Bacchetta, N and Bisello, D and Boletti, A and Bragagnolo, A and Carlin, R and Checchia, P and Dall'Osso, M and De Castro Manzano, P and Dorigo, T and Dosselli, U and Gasparini, F and Gasparini, U and Gozzelino, A and Hoh, SY and Lacaprara, S and Lujan, P and Margoni, M and Meneguzzo, AT and Pazzini, J and Ronchese, P and Rossin, R and Simonetto, F and Tiko, A and Torassa, E and Zanetti, M and Zotto, P and Zumerle, G and Braghieri, A and Magnani, A and Montagna, P and Ratti, SP and Re, V and Ressegotti, M and Riccardi, C and Salvini, P and Vai, I and Vitulo, P and Biasini, M and Bilei, GM and Cecchi, C and Ciangottini, D and Fanò, L and Lariccia, P and Leonardi, R and Manoni, E and Mantovani, G and Mariani, V and Menichelli, M and Rossi, A and Santocchia, A and Spiga, D and Androsov, K and Azzurri, P and Bagliesi, G and Bianchini, L and Boccali, T and Borrello, L and Castaldi, R and Ciocci, MA and Dell'Orso, R and Fedi, G and Fiori, F and Giannini, L and Giassi, A and Grippo, MT and Ligabue, F and Manca, E and Mandorli, G and Messineo, A and Palla, F and Rizzi, A and Spagnolo, P and Tenchini, R and Tonelli, G and Venturi, A and Verdini, PG and Barone, L and Cavallari, F and Cipriani, M and Del Re, D and Di Marco, E and Diemoz, M and Gelli, S and Longo, E and Marzocchi, B and Meridiani, P and Organtini, G and Pandolfi, F and Paramatti, R and Preiato, F and Rahatlou, S and Rovelli, C and Santanastasio, F and Amapane, N and Arcidiacono, R and Argiro, S and Arneodo, M and Bartosik, N and Bellan, R and Biino, C and Cartiglia, N and Cenna, F and Cometti, S and Costa, M and Covarelli, R and Demaria, N and Kiani, B and Mariotti, C and Maselli, S and Migliore, E and Monaco, V and Monteil, E and Monteno, M and Obertino, MM and Pacher, L and Pastrone, N and Pelliccioni, M and Pinna Angioni, GL and Romero, A and Ruspa, M and Sacchi, R and Shchelina, K and Sola, V and Solano, A and Soldi, D and Staiano, A and Belforte, S and Candelise, V and Casarsa, M and Cossutti, F and Da Rold, A and Della Ricca, G and Vazzoler, F and Zanetti, A and Kim, DH and Kim, GN and Kim, MS and Lee, J and Lee, S and Lee, SW and Moon, CS and Oh, YD and Pak, SI and Sekmen, S and Son, DC and Yang, YC and Kim, H and Moon, DH and Oh, G and Goh, J and Kim, TJ and Cho, S and Choi, S and Go, Y and Gyun, D and Ha, S and Hong, B and Jo, Y and Lee, K and Lee, KS and Lim, J and Park, SK and Roh, Y and Kim, HS and Almond, J and Kim, J and Kim, JS and Lee, H and Nam, K and Oh, SB and Radburn-Smith, BC and Seo, SH and Yang, UK and Yoo, HD and Yu, GB and Jeon, D and Kim, JH and Lee, JSH and Park, IC and Choi, Y and Hwang, C and Yu, I and Dudenas, V and Juodagalvis, A and Vaitkus, J and Ahmed, I and Ibrahim, ZA and Md Ali, MAB and Mohamad Idris, F and Wan Abdullah, WAT and Yusli, MN and Zolkapli, Z and Benitez, JF and Castaneda Hernandez, A and Murillo Quijada, JA and Castilla-Valdez, H and De La Cruz-Burelo, E and Duran-Osuna, MC and Heredia-De La Cruz, I and Lopez-Fernandez, R and Mejia Guisao, J and Rabadan-Trejo, RI and Ramirez-Garcia, M and Ramirez-Sanchez, G and Reyes-Almanza, R and Sanchez-Hernandez, A and Carrillo Moreno, S and Oropeza Barrera, C and Vazquez Valencia, F and Eysermans, J and Pedraza, I and Salazar Ibarguen, HA and Uribe Estrada, C and Morelos Pineda, A and Krofcheck, D and Bheesette, S and Butler, PH and Ahmad, A and Asghar, MI and Hassan, Q and Hoorani, HR and Saddique, A and Shah, MA and Shoaib, M and Waqas, M and Bialkowska, H and Bluj, M and Boimska, B and Frueboes, T and Górski, M and Kazana, M and Nawrocki, K and Szleper, M and Traczyk, P and Zalewski, P and Bunkowski, K and Byszuk, A and Doroba, K and Kalinowski, A and Konecki, M and Krolikowski, J and Misiura, M and Olszewski, M and Pyskir, A and Walczak, M and Araujo, M and Bargassa, P and Beirão Da Cruz E Silva, C and Di Francesco, A and Faccioli, P and Galinhas, B and Gallinaro, M and Hollar, J and Leonardo, N and Nemallapudi, MV and Seixas, J and Strong, G and Toldaiev, O and Vadruccio, D and Varela, J and Afanasiev, S and Bunin, P and Gavrilenko, M and Golutvin, I and Gorbunov, I and Kamenev, A and Karjavine, V and Lanev, A and Malakhov, A and Matveev, V and Moisenz, P and Palichik, V and Perelygin, V and Shmatov, S and Shulha, S and Skatchkov, N and Smirnov, V and Voytishin, N and Zarubin, A and Golovtsov, V and Ivanov, Y and Kim, V and Kuznetsova, E and Levchenko, P and Murzin, V and Oreshkin, V and Smirnov, I and Sosnov, D and Sulimov, V and Uvarov, L and Vavilov, S and Vorobyev, A and Andreev, Y and Dermenev, A and Gninenko, S and Golubev, N and Karneyeu, A and Kirsanov, M and Krasnikov, N and Pashenkov, A and Tlisov, D and Toropin, A and Epshteyn, V and Gavrilov, V and Lychkovskaya, N and Popov, V and Pozdnyakov, I and Safronov, G and Spiridonov, A and Stepennov, A and Stolin, V and Toms, M and Vlasov, E and Zhokin, A and Aushev, T and Chadeeva, M and Parygin, P and Philippov, D and Polikarpov, S and Popova, E and Rusinov, V and Andreev, V and Azarkin, M and Dremin, I and Kirakosyan, M and Rusakov, SV and Terkulov, A and Baskakov, A and Belyaev, A and Boos, E and Ershov, A and Gribushin, A and Khein, L and Klyukhin, V and Kodolova, O and Lokhtin, I and Lukina, O and Miagkov, I and Obraztsov, S and Petrushanko, S and Savrin, V and Snigirev, A and Barnyakov, A and Blinov, V and Dimova, T and Kardapoltsev, L and Skovpen, Y and Azhgirey, I and Bayshev, I and Bitioukov, S and Elumakhov, D and Godizov, A and Kachanov, V and Kalinin, A and Konstantinov, D and Mandrik, P and Petrov, V and Ryutin, R and Slabospitskii, S and Sobol, A and Troshin, S and Tyurin, N and Uzunian, A and Volkov, A and Babaev, A and Baidali, S and Okhotnikov, V and Adzic, P and Cirkovic, P and Devetak, D and Dordevic, M and Milosevic, J and Alcaraz Maestre, J and Ã�lvarez Fernández, A and Bachiller, I and Barrio Luna, M and Brochero Cifuentes, JA and Cerrada, M and Colino, N and De La Cruz, B and Delgado Peris, A and Fernandez Bedoya, C and Fernández Ramos, JP and Flix, J and Fouz, MC and Gonzalez Lopez, O and Goy Lopez, S and Hernandez, JM and Josa, MI and Moran, D and Pérez-Calero Yzquierdo, A and Puerta Pelayo, J and Redondo, I and Romero, L and Soares, MS and Triossi, A and Albajar, C and de Trocóniz, JF and Cuevas, J and Erice, C and Fernandez Menendez, J and Folgueras, S and Gonzalez Caballero, I and González Fernández, JR and Palencia Cortezon, E and Rodríguez Bouza, V and Sanchez Cruz, S and Vischia, P and Vizan Garcia, JM and Cabrillo, IJ and Calderon, A and Chazin Quero, B and Duarte Campderros, J and Fernandez, M and Fernández Manteca, PJ and García Alonso, A and Garcia-Ferrero, J and Gomez, G and Lopez Virto, A and Marco, J and Martinez Rivero, C and Martinez Ruiz del Arbol, P and Matorras, F and Piedra Gomez, J and Prieels, C and Rodrigo, T and Ruiz-Jimeno, A and Scodellaro, L and Trevisani, N and Vila, I and Vilar Cortabitarte, R and Wickramage, N and Abbaneo, D and Akgun, B and Auffray, E and Auzinger, G and Baillon, P and Ball, AH and Barney, D and Bendavid, J and Bianco, M and Bocci, A and Botta, C and Brondolin, E and Camporesi, T and Cepeda, M and Cerminara, G and Chapon, E and Cucciati, G and d'Enterria, D and Dabrowski, A and Daci, N and Daponte, V and David, A and De Roeck, A and Deelen, N and Dobson, M and Dünser, M and Dupont, N and Elliott-Peisert, A and Everaerts, P and Fallavollita, F and Fasanella, D and Franzoni, G and Fulcher, J and Funk, W and Gigi, D and Gilbert, A and Gill, K and Glege, F and Guilbaud, M and Gulhan, D and Hegeman, J and Heidegger, C and Innocente, V and Jafari, A and Janot, P and Karacheban, O and Kieseler, J and Kornmayer, A and Krammer, M and Lange, C and Lecoq, P and Lourenço, C and Malgeri, L and Mannelli, M and Meijers, F and Merlin, JA and Mersi, S and Meschi, E and Milenovic, P and Moortgat, F and Mulders, M and Ngadiuba, J and Nourbakhsh, S and Orfanelli, S and Orsini, L and Pantaleo, F and Pape, L and Perez, E and Peruzzi, M and Petrilli, A and Petrucciani, G and Pfeiffer, A and Pierini, M and Pitters, FM and Rabady, D and Racz, A and Reis, T and Rolandi, G and Rovere, M and Sakulin, H and Schäfer, C and Schwick, C and Seidel, M and Selvaggi, M and Silva, P and Sphicas, P and Stakia, A and 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and De Guio, F and Dudero, PR and Kunori, S and Lamichhane, K and Mengke, T and Muthumuni, S and Peltola, T and Undleeb, S and Volobouev, I and Greene, S and Gurrola, A and Janjam, R and Johns, W and Maguire, C and Melo, A and Ni, H and Padeken, K and Ruiz Alvarez, JD and Sheldon, P and Tuo, S and Velkovska, J and Verweij, M and Xu, Q and Arenton, MW and Barria, P and Cox, B and Hirosky, R and Joyce, M and Ledovskoy, A and Li, H and Neu, C and Sinthuprasith, T and Wolfe, E and Xia, F and Harr, R and Karchin, PE and Poudyal, N and Sturdy, J and Thapa, P and Zaleski, S and Brodski, M and Buchanan, J and Caillol, C and Carlsmith, D and Dasu, S and Dodd, L and Gomber, B and Grothe, M and Herndon, M and Hervé, A and Hussain, U and Klabbers, P and Lanaro, A and Long, K and Loveless, R and Ruggles, T and Savin, A and Smith, N and Smith, WH and Woods, N and Malik, S and Collaboration, The CMS (2019) Evidence for light-by-light scattering and searches for axion-like particles in ultraperipheral PbPb collisions at √sNN = 5.02 TeV. In: Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics, 797 .

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Official URL: https://doi.org/10.1016/j.physletb.2019.134826

Abstract

Evidence for the light-by-light scattering process, γγ→γγ, in ultraperipheral PbPb collisions at a centre-of-mass energy per nucleon pair of 5.02TeV is reported. The analysis is conducted using a data sample corresponding to an integrated luminosity of 390μb−1 recorded by the CMS experiment at the LHC. Light-by-light scattering processes are selected in events with two photons exclusively produced, each with transverse energy ET γ>2GeV, pseudorapidity |ηγ|<2.4, diphoton invariant mass mγγ>5GeV, diphoton transverse momentum pT γγ<1GeV, and diphoton acoplanarity below 0.01. After all selection criteria are applied, 14 events are observed, compared to expectations of 9.0±0.9(theo) events for the signal and 4.0±1.2(stat) for the background processes. The excess observed in data relative to the background-only expectation corresponds to a significance of 3.7 standard deviations, and has properties consistent with those expected for the light-by-light scattering signal. The measured fiducial light-by-light scattering cross section, σfid(γγ→γγ)=120±46(stat)±28(syst)±12(theo)nb, is consistent with the standard model prediction. The mγγ distribution is used to set new exclusion limits on the production of pseudoscalar axion-like particles, via the (Figure presented.) process, in the mass range (Figure presented.).

Item Type: Journal Article
Publication: Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
Publisher: Elsevier B.V.
Additional Information: The copyright for this article belongs to the Authors.
Keywords: CMS; Light-by-light; PbPb; Photoproduction; UPC
Department/Centre: Division of Physical & Mathematical Sciences > Centre for High Energy Physics
Date Deposited: 19 Oct 2022 09:10
Last Modified: 19 Oct 2022 09:10
URI: https://eprints.iisc.ac.in/id/eprint/77340

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