Measurements of differential cross-sections of WbWb production in the dilepton channel in pp collisions at s = 13 TeV using the ATLAS detector

Journal of High Energy Physics Springer 2026:2 (2026) 153

Authors:

G Aad, E Aakvaag, B Abbott, S Abdelhameed, K Abeling, NJ Abicht, SH Abidi, M Aboelela, A Aboulhorma, H Abramowicz, Y Abulaiti, BS Acharya, A Ackermann, C Adam Bourdarios, L Adamczyk, SV Addepalli, MJ Addison, J Adelman, A Adiguzel, T Adye, AA Affolder, Y Afik, MN Agaras, A Aggarwal

Abstract:

At the Large Hadron Collider, the WbWb final state is expected to be dominated by tt¯ production with a contribution from single-top processes. Differential cross-sections for WbWb production in the dilepton decay channel are measured at the particle level as a function of various kinematic variables. The analysis is based on data from proton-proton collisions at a centre-of-mass energy of s=13 TeV, recorded by the ATLAS detector at the Large Hadron Collider over the period from 2015 to 2018, corresponding to an integrated luminosity of 140 fb−1. Measurements are performed within the fiducial phase-space defined by the presence of two b-jets and one electron and one muon of opposite charges. The differential cross-sections are corrected for detector effects and unfolded to the particle level. Results are compared with predictions from Monte Carlo event generators at next-to-leading order in perturbative quantum chromodynamics; overall the measurements are in reasonable agreement with several generator setups, although no single prediction is able to describe all measured distributions simultaneously. These measurements provide valuable constraints on the modelling of WbWb production and the interference between doubly resonant and singly resonant WbWb production.

HostSub_GP: Precise Galaxy Background Subtraction in Transient Long-slit Spectroscopy with Gaussian Processes

Publications of the Astronomical Society of the Pacific IOP Publishing 138:2 (2026) 024503

Authors:

Chang Liu, Adam A Miller

Abstract:

We present a novel host galaxy subtraction technique in long-slit spectroscopy for extragalactic transients. Unlike classic methods which generally estimate the background using simple interpolation of local galaxy flux in the 2D spectrum, our approach leverages multi-band archival images of the host galaxies to model the background emission from the galaxy in the 2D spectrum. Such imaging encodes the wavelength-dependent galaxy profile along the slit, and is readily accessible through wide-field imaging surveys. We construct a smooth prior for the 2D galaxy profile with a Gaussian process (GP) based on these reference images, and use another GP to model the correlated deviations from the prior in the observed spectrum. This enables accurate inference of the galaxy flux blended with the transient. On synthetic long-slit data of a spiral galaxy extracted from a Multi Unit Spectroscopic Explorer hyper-spectral cube, the GP method remains robust as long as the host galaxy is spatially resolved and consistently outperforms classic methods. We apply the method to archival Keck spectra of two real transients, SN 2019eix and AT 2019qiz, to further demonstrate how the method uniquely recovers weak spectral features amid strong galaxy contamination, enabling refined constraints on the properties of both transients. We have released the software implementation, HostSub_GP, a scalable toolkit that leverages JAX, with an MIT license.

Strategic white paper on AI infrastructure for particle, nuclear, and astroparticle physics: insights from JENA and EuCAIF

Machine Learning: Science and Technology IOP Publishing 7:1 (2026) 013002-013002

Authors:

Sascha Caron, Andreas Ipp, Gert Aarts, Gåbor Bíró, Daniele Bonacorsi, Elena Cuoco, Caterina Doglioni, Tommaso Dorigo, Juliån García Pardiñas, Stefano Giagu, Tobias Golling, Lukas Heinrich, Ik Siong Heng, Paula Gina Isar, Karolos Potamianos, Liliana Teodorescu, John Veitch, Pietro Vischia, Christoph Weniger

Abstract:

Abstract Artificial intelligence (AI) is transforming scientific research, with deep learning methods playing a central role in data analysis, simulations, and signal detection across particle, nuclear, and astroparticle physics. Within the JENA (Joint ECFA, NuPECC, APPEC) communities and as part of the European Coalition for AI in Fundamental Physics initiative, AI integration is advancing steadily. However, broader adoption remains constrained by challenges such as limited computational resources, a lack of expertise, and difficulties in transitioning from research and development to production. This white paper provides a strategic roadmap, informed by a community survey, to address these barriers. It outlines critical infrastructure requirements, prioritises training initiatives, and proposes funding strategies to scale AI capabilities across fundamental physics over the next five years.

Charge calibration of MALTA2, a radiation hard depleted monolithic active pixel sensor

Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment Elsevier BV 1082 (2026) 170972

Authors:

Lucian Fasselt, Ignacio Asensi Tortajada, Prafulla Behera, Dumitru Vlad Berlea, Daniela Bortoletto, Craig Buttar, Valerio Dao, Ganapati Dash, Leyre Flores Sanz de Acedo, Martin Gazi, Laura Gonella, Vicente GonzĂĄlez, Sebastian Haberl, Tomohiro Inada, Pranati Jana, Long Li, Heinz Pernegger, Petra Riedler, Walter Snoeys, Carlos Solans SĂĄnchez, Milou van Rijnbach, Marcos VĂĄzquez NĂșñez, Anusree Vijay, Julian Weick, Steven Worm

Observation of $W^{+}W^{-}\\gamma$ production in $pp$ collisions at $\\sqrt{s}$ = 13 TeV with the ATLAS detector and constraints on anomalous quartic gauge-boson couplings

Physics Letters B Elsevier 873 (2026) 140050

Authors:

G Aad, E Aakvaag, B Abbott, S Abdelhameed, K Abeling, NJ Abicht, SH Abidi, M Aboelela, A Aboulhorma, H Abramowicz, Y Abulaiti, BS Acharya, A Ackermann, C Adam Bourdarios, L Adamczyk, SV Addepalli, MJ Addison, J Adelman, A Adiguzel, T Adye, AA Affolder, Y Afik, MN Agaras, A Aggarwal, C Agheorghiesei, F Ahmadov, S Ahuja, S Ahuja, X Ai, G Aielli, A Aikot, M Ait Tamlihat, B Aitbenchikh, M Akbiyik, TPA Åkesson, AV Akimov, D Akiyama, NN Akolkar, S Aktas, GL Alberghi, J Albert, U Alberti, P Albicocco, GL Albouy, S Alderweireldt, ZL Alegria, M Aleksa, IN Aleksandrov, C Alexa, T Alexopoulos, F Alfonsi, M Algren, M Alhroob, B Ali, HMJ Ali, S Ali, SW Alibocus, M Aliev, G Alimonti, W Alkakhi, C Allaire, BMM Allbrooke, DR Allen, JS Allen, JF Allen, PP Allport, A Aloisio, F Alonso, C Alpigiani, ZMK Alsolami, A Alvarez Fernandez, M Alves Cardoso, MG Alviggi, M Aly, Y Amaral Coutinho, A Ambler, C Amelung, M Amerl, CG Ames, T Amezza, D Amidei, B Amini, K Amirie, A Amirkhanov, SP Amor Dos Santos, KR Amos, D Amperiadou, S An, C Anastopoulos, T Andeen, JK Anders, AC Anderson, A Andreazza, S Angelidakis, A Angerami, AV Anisenkov, A Annovi, C Antel, E Antipov, M Antonelli, F Anulli, M Aoki, T Aoki, MA Aparo, L Aperio Bella, M Apicella, C Appelt, A Apyan, M Arampatzi, SJ Arbiol Val, C Arcangeletti, ATH Arce, J-F Arguin, S Argyropoulos, J-H Arling, O Arnaez, H Arnold, G Artoni, H Asada, K Asai, S Asatryan, NA Asbah, RA Ashby Pickering, AM Aslam, K Assamagan, R Astalos, KSV Astrand, S Atashi, RJ Atkin, H Atmani, PA Atmasiddha, K Augsten, AD Auriol, VA Austrup, AS Avad, G Avolio, K Axiotis, A Azzam, D Babal, H Bachacou, K Bachas, A Bachiu, E Bachmann, MJ Backes, A Badea, TM Baer, P Bagnaia, M Bahmani, D Bahner, K Bai, JT Baines, L Baines, OK Baker, E Bakos, D Bakshi Gupta, LE Balabram Filho, V Balakrishnan, R Balasubramanian, EM Baldin, P Balek, E Ballabene, F Balli, LM Baltes, WK Balunas, J Balz, I Bamwidhi, E Banas, M Bandieramonte, A Bandyopadhyay, S Bansal, L Barak, M Barakat, EL Barberio, D Barberis, M Barbero, MZ Barel, T Barillari, M-S Barisits, T Barklow, P Baron, DA Baron Moreno, A Baroncelli, AJ Barr, JD Barr, F Barreiro, J Barreiro GuimarĂŁes da Costa, MG Barros Teixeira, S Barsov, F Bartels, R Bartoldus, AE Barton, P Bartos, M Baselga, S Bashiri, A Bassalat, MJ Basso, S Bataju, R Bate, RL Bates, S Batlamous, M Battaglia, D Battulga, M Bauce, M Bauer, P Bauer, LT Bayer, LT Bazzano Hurrell, JB Beacham, T Beau, JY Beaucamp, PH Beauchemin, P Bechtle, HP Beck, K Becker, AJ Beddall, VA Bednyakov, CP Bee, LJ Beemster, M Begalli, M Begel, JK Behr, JF Beirer, F Beisiegel, M Belfkir, G Bella, L Bellagamba, A Bellerive, CD Bellgraph, P Bellos, K Beloborodov, I Benaoumeur, D Benchekroun, F Bendebba, Y Benhammou, KC Benkendorfer, L Beresford, M Beretta, E Bergeaas Kuutmann, N Berger, B Bergmann, J Beringer, G Bernardi, C Bernius, FU Bernlochner, A Berrocal Guardia, T Berry, P Berta, A Berthold, A Berti, R Bertrand, S Bethke, A Betti, AJ Bevan, L Bezio, NK Bhalla, S Bharthuar, S Bhatta, P Bhattarai, ZM Bhatti, KD Bhide, VS Bhopatkar, RM Bianchi, G Bianco, O Biebel, M Biglietti, CS Billingsley, Y Bimgdi, M Bindi, A Bingham, A Bingul, C Bini, GA Bird, M Birman, M Biros, S Biryukov, T Bisanz, E Bisceglie, JP Biswal, D Biswas, I Bloch, A Blue, U Blumenschein, VS Bobrovnikov, L Boccardo, M Boehler, B Boehm, D Bogavac, AG Bogdanchikov, LS Boggia, V Boisvert, P Bokan, T Bold, M Bomben, M Bona, M Boonekamp, AG BorbĂ©ly, IS Bordulev, G Borissov, D Bortoletto, D Boscherini, M Bosman, K Bouaouda, N Bouchhar, L Boudet, J Boudreau, EV Bouhova-Thacker, D Boumediene, R Bouquet, A Boveia, J Boyd, D Boye, IR Boyko, L Bozianu, J Bracinik, N Brahimi, G Brandt, O Brandt, B Brau, JE Brau, R Brener, L Brenner, R Brenner, S Bressler, G Brianti, D Britton, D Britzger, I Brock, R Brock, G Brooijmans, AJ Brooks, EM Brooks, E Brost, LM Brown, LE Bruce, TL Bruckler, PA Bruckman de Renstrom, B BrĂŒers, A Bruni, G Bruni, D Brunner, M Bruschi, N Bruscino, T Buanes, Q Buat, D Buchin, AG Buckley, O Bulekov, BA Bullard, S Burdin, CD Burgard, AM Burger, B Burghgrave, O Burlayenko, J Burleson, JC Burzynski, EL Busch, V BĂŒscher, PJ Bussey, O But, JM Butler, CM Buttar, JM Butterworth, W Buttinger, CJ Buxo Vazquez, AR Buzykaev, S Cabrera UrbĂĄn, L Cadamuro, H Cai, Y Cai, Y Cai, VMM Cairo, O Cakir, N Calace, P Calafiura, G Calderini, P Calfayan, L Calic, G Callea, LP Caloba, D Calvet, S Calvet, R Camacho Toro, S Camarda, D Camarero Munoz, P Camarri, C Camincher, M Campanelli, A Camplani, V Canale, AC Canbay, E Canonero, J Cantero, Y Cao, F Capocasa, M Capua, A Carbone, R Cardarelli, JCJ Cardenas, MP Cardiff, G Carducci, T Carli, G Carlino, JI Carlotto, BT Carlson, EM Carlson, J Carmignani, L Carminati, A Carnelli, M Carnesale, S Caron, E Carquin, IB Carr, S CarrĂĄ, G Carratta, C Carrion Martinez, AM Carroll, MP Casado, P Casolaro, M Caspar, WR Castiglioni, FL Castillo, L Castillo Garcia, V Castillo Gimenez, NF Castro, A Catinaccio, JR Catmore, T Cavaliere, V Cavaliere, LJ Caviedes Betancourt, E Celebi, S Cella, V Cepaitis, K Cerny, AS Cerqueira, A Cerri, L Cerrito, F Cerutti, B Cervato, A Cervelli, G Cesarini, SA Cetin, PM Chabrillat, R Chakkappai, S Chakraborty, A Chambers, J Chan, WY Chan, JD Chapman, E Chapon, B Chargeishvili, DG Charlton, C Chauhan, Y Che, S Chekanov, GA Chelkov, B Chen, B Chen, H Chen, H Chen, J Chen, J Chen, M Chen, S Chen, SJ Chen, X Chen, X Chen, Z Chen, CL Cheng, HC Cheng, S Cheong, A Cheplakov, E Cherepanova, R Cherkaoui El Moursli, E Cheu, K Cheung, L Chevalier, V Chiarella, G Chiarelli, G Chiodini, AS Chisholm, A Chitan, M Chitishvili, MV Chizhov, K Choi, Y Chou, EYS Chow, KL Chu, MC Chu, X Chu, Z Chubinidze, J Chudoba, JJ Chwastowski, D Cieri, KM Ciesla, V Cindro, A Ciocio, F Cirotto, ZH Citron, M Citterio, DA Ciubotaru, A Clark, PJ Clark, N Clarke Hall, C Clarry, SE Clawson, C Clement, L Clissa, Y Coadou, M Cobal, A Coccaro, RF Coelho Barrue, R Coelho Lopes De Sa, S Coelli, LS Colangeli, B Cole, P Collado Soto, J Collot, R Coluccia, P Conde Muiño, MP Connell, SH Connell, EI Conroy, M Contreras Cossio, F Conventi, AM Cooper-Sarkar, L Corazzina, FA Corchia, A Cordeiro Oudot Choi, LD Corpe, M Corradi, F Corriveau, A Cortes-Gonzalez, MJ Costa, F Costanza, D Costanzo, J Couthures, G Cowan, K Cranmer, L Cremer, D Cremonini, S CrĂ©pĂ©-Renaudin, F Crescioli, T Cresta, M Cristinziani, M Cristoforetti, E Critelli, V Croft, G Crosetti, A Cueto, H Cui, Z Cui, BM Cunnett, WR Cunningham, F Curcio, JR Curran, MJ Da Cunha Sargedas De Sousa, JV Da Fonseca Pinto, C Da Via, W Dabrowski, T Dado, S Dahbi, T Dai, D Dal Santo, C Dallapiccola, M Dam, G D’amen, V D’Amico, JR Dandoy, M D’Andrea, D Dannheim, G D’anniballe, M Danninger, V Dao, G Darbo, SJ Das, F Dattola, S D’Auria, A D’Avanzo, T Davidek, J Davidson, I Dawson, K De, C De Almeida Rossi, R De Asmundis, N De Biase, S De Castro, N De Groot, P de Jong, H De la Torre, A De Maria, A De Salvo, U De Sanctis, F De Santis, A De Santo, JB De Vivie De Regie, J Debevc, DV Dedovich, J Degens, AM Deiana, J Del Peso, L Delagrange, F Deliot, CM Delitzsch, M Della Pietra, D Della Volpe, A Dell’Acqua, L Dell’Asta, M Delmastro, CC Delogu, PA Delsart, S Demers, M Demichev, SP Denisov, H Denizli, L D’Eramo, D Derendarz, F Derue, P Dervan, AM Desai, K Desch, FA Di Bello, A Di Ciaccio, L Di Ciaccio, A Di Domenico, C Di Donato, A Di Girolamo, G Di Gregorio, A Di Luca, B Di Micco, R Di Nardo, KF Di Petrillo, M Diamantopoulou, FA Dias, MA Diaz, AR Didenko, M Didenko, SD Diefenbacher, EB Diehl, S Ă­ez Cornell, C Diez Pardos, C Dimitriadi, A Dimitrievska, A Dimri, Y Ding, J Dingfelder, T Dingley, I-M Dinu, SJ Dittmeier, F Dittus, M Divisek, B Dixit, F Djama, T Djobava, C Doglioni, A Dohnalova, Z Dolezal, K Domijan, KM Dona, M Donadelli, B Dong, J Donini, A D’Onofrio, M D’Onofrio, J Dopke, A Doria, N Dos Santos Fernandes, IA Dos Santos Luz, P Dougan, MT Dova, AT Doyle, MP Drescher, E Dreyer, I Drivas-koulouris, M Drnevich, D Du, TA du Pree, Z Duan, M Dubau, F Dubinin, M Dubovsky, E Duchovni, G Duckeck, PK Duckett, OA Ducu, D Duda, A Dudarev, MM Dudek, ER Duden, M D’uffizi, L Duflot, M DĂŒhrssen, I Duminica, AE Dumitriu, M Dunford, K Dunne, A Duperrin, H Duran Yildiz, A Durglishvili, GI Dyckes, M Dyndal, BS Dziedzic, ZO Earnshaw, GH Eberwein, B Eckerova, S Eggebrecht, E Egidio Purcino De Souza, G Eigen, K Einsweiler, T Ekelof, PA Ekman, S El Farkh, Y El Ghazali, H El Jarrari, A El Moussaouy, D Elitez, M Ellert, F Ellinghaus, TA Elliot, N Ellis, J Elmsheuser, M Elsawy, M Elsing, D Emeliyanov, Y Enari, S Epari, D Ernani Martins Neto, F Ernst, M Escalier, C Escobar, E Etzion, G Evans, H Evans, LS Evans, A Ezhilov, S Ezzarqtouni, F Fabbri, L Fabbri, G Facini, V Fadeyev, RM Fakhrutdinov, D Fakoudis, S Falciano, LF Falda Ulhoa Coelho, F Fallavollita, G Falsetti, J Faltova, C Fan, KY Fan, Y Fan, Y Fang, M Fanti, M Faraj, Z Farazpay, A Farbin, A Farilla, K Farman, T Farooque, JN Farr, MS Farrington, SM Farrington, F Fassi, D Fassouliotis, L Fayard, P Federic, P Federicova, OL Fedin, M Feickert, L Feligioni, DE Fellers, C Feng, Y Feng, Z Feng, MJ Fenton, L Ferencz, B Fernandez Barbadillo, P Fernandez Martinez, MJV Fernoux, J Ferrando, A Ferrari, P Ferrari, R Ferrari, D Ferrere, C Ferretti, MP Fewell, D Fiacco, F Fiedler, P Fiedler, S Filimonov, MS Filip, A Filipčič, EK Filmer, F Filthaut, MCN Fiolhais, L Fiorini, WC Fisher, T Fitschen, PM Fitzhugh, I Fleck, P Fleischmann, T Flick, M Flores, LR Flores Castillo, L Flores Sanz De Acedo, FM Follega, N Fomin, JH Foo, A Formica, AC Forti, E Fortin, AW Fortman, L Foster, L Fountas, D Fournier, H Fox, P Francavilla, S Francescato, S Franchellucci, M Franchini, S Franchino, D Francis, L Franco, L Franconi, M Franklin, G Frattari, YY Frid, J Friend, N Fritzsche, A Froch, D Froidevaux, JA Frost, Y Fu, S Fuenzalida Garrido, M Fujimoto, KY Fung, E Furtado De Simas Filho, M Furukawa, J Fuster, A Gaa, A Gabrielli, A Gabrielli, P Gadow, G Gagliardi, LG Gagnon, S Gaid, S Galantzan, J Gallagher, EJ Gallas, AL Gallen, BJ Gallop, KK Gan, S Ganguly, Y Gao, A Garabaglu, FM Garay Walls, C GarcĂ­a, A Garcia Alonso, AG Garcia Caffaro, JE GarcĂ­a Navarro, MA Garcia Ruiz, M Garcia-Sciveres, GL Gardner, RW Gardner, N Garelli, RB Garg, JM Gargan, CA Garner, CM Garvey, VK Gassmann, G Gaudio, V Gautam, P Gauzzi, J Gavranovic, IL Gavrilenko, A Gavrilyuk, C Gay, G Gaycken, EN Gazis, A Gekow, C Gemme, MH Genest, AD Gentry, S George, T Geralis, AA Gerwin, P Gessinger-Befurt, ME Geyik, M Ghani, K Ghorbanian, A Ghosal, A Ghosh, A Ghosh, B Giacobbe, S Giagu, T Giani, A Giannini, SM Gibson, M Gignac, DT Gil, AK Gilbert, BJ Gilbert, D Gillberg, G Gilles, DM Gingrich, MP Giordani, PF Giraud, G Giugliarelli, D Giugni, F Giuli, I Gkialas, LK Gladilin, C Glasman, M Glazewska, RM Gleason, G GlemĆŸa, M Glisic, I Gnesi, Y Go, M Goblirsch-Kolb, B Gocke, D Godin, B Gokturk, S Goldfarb, T Golling, MGD Gololo, D Golubkov, JP Gombas, A Gomes, G Gomes Da Silva, AJ Gomez Delegido, R Gonçalo, L Gonella, A Gongadze, F Gonnella, JL Gonski, RY GonzĂĄlez Andana, S GonzĂĄlez de la Hoz, MV Gonzalez Rodrigues, R Gonzalez Suarez, S Gonzalez-Sevilla, L Goossens, B Gorini, E Gorini, A GoriĆĄek, TC Gosart, AT Goshaw, MI Gostkin, S Goswami, CA Gottardo, SA Gotz, M Gouighri, AG Goussiou, N Govender, RP Grabarczyk, I Grabowska-Bold, K Graham, E Gramstad, S Grancagnolo, CM Grant, PM Gravila, FG Gravili, HM Gray, M Greco, MJ Green, C Grefe, AS Grefsrud, IM Gregor, KT Greif, P Grenier, SG Grewe, AA Grillo, K Grimm, S Grinstein, J-F Grivaz, E Gross, J Grosse-Knetter, L Guan, G Guerrieri, R Guevara, R Gugel, JAM Guhit, A Guida, E Guilloton, S Guindon, F Guo, J Guo, L Guo, L Guo, Y Guo, Y Guo, A Gupta, R Gupta, S Gupta, S Gurbuz, SS Gurdasani, G Gustavino, P Gutierrez, LF Gutierrez Zagazeta, M Gutsche, C Gutschow, C Gwenlan, CB Gwilliam, ES Haaland, A Haas, M Habedank, C Haber, HK Hadavand, A Haddad, A Hadef, AI Hagan, JJ Hahn, EH Haines, M Haleem, J Haley, GD Hallewell, JA Hallford, K Hamano, H Hamdaoui, M Hamer, SED Hammoud, EJ Hampshire, J Han, L Han, L Han, S Han, K Hanagaki, M Hance, DA Hangal, H Hanif, MD Hank, JB Hansen, PH Hansen, T Harenberg, S Harkusha, ML Harris, YT Harris, J Harrison, NM Harrison, PF Harrison, MLE Hart, NM Hartman, NM Hartmann, RZ Hasan, Y Hasegawa, F Haslbeck, S Hassan, R Hauser, M Haviernik, CM Hawkes, RJ Hawkings, Y Hayashi, D Hayden, C Hayes, RL Hayes, CP Hays, JM Hays, HS Hayward, M He, Y He, Y He, NB Heatley, V Hedberg, J Heilman, S Heim, T Heim, JJ Heinrich, L Heinrich, J Hejbal, M Helbig, A Held, S Hellesund, CM Helling, S Hellman, AM Henriques Correia, H Herde, Y HernĂĄndez JimĂ©nez, LM Herrmann, T Herrmann, G Herten, R Hertenberger, L Hervas, ME Hesping, NP Hessey, J Hessler, M Hidaoui, N Hidic, E Hill, TS Hillersoy, SJ Hillier, JR Hinds, F Hinterkeuser, M Hirose, S Hirose, D Hirschbuehl, TG Hitchings, B Hiti, J Hobbs, R Hobincu, N Hod, AM Hodges, MC Hodgkinson, BH Hodkinson, A Hoecker, DD Hofer, J Hofer, J Hofner, M Holzbock, LBAH Hommels, V Homsak, BP Honan, JJ Hong, TM Hong, BH Hooberman, WH Hopkins, MC Hoppesch, Y Horii, ME Horstmann, S Hou, MR Housenga, J Howarth, J Hoya, M Hrabovsky, T Hryn’ova, PJ Hsu, S-C Hsu, T Hsu, M Hu, Q Hu, S Huang, X Huang, Y Huang, Y Huang, Y Huang, Z Huang, Z Hubacek, F Huegging, TB Huffman, M Hufnagel Maranha De Faria, CA Hugli, M Huhtinen, SK Huiberts, R Hulsken, CE Hultquist, DL Humphreys, N Huseynov, J Huston, J Huth, L Huth, R Hyneman, G Iacobucci, G Iakovidis, L Iconomidou-Fayard, JP Iddon, P Iengo, Y Iiyama, T Iizawa, Y Ikegami, D Iliadis, N Ilic, H Imam, G Inacio Goncalves, SA Infante Cabanas, T Ingebretsen Carlson, JM Inglis, G Introzzi, M Iodice, V Ippolito, RK Irwin, M Ishino, W Islam, C Issever, S Istin, K Itabashi, H Ito, R Iuppa, A Ivina, V Izzo, P Jacka, P Jackson, P Jain, K Jakobs, T Jakoubek, J Jamieson, W Jang, S Jankovych, M Javurkova, P Jawahar, L Jeanty, J Jejelava, P Jenni, CE Jessiman, C Jia, H Jia, J Jia, X Jia, Z Jia, C Jiang, Q Jiang, S Jiggins, M Jimenez Ortega, J Jimenez Pena, S Jin, A Jinaru, O Jinnouchi, P Johansson, KA Johns, JW Johnson, FA Jolly, DM Jones, E Jones, KS Jones, P Jones, RWL Jones, TJ Jones, HL Joos, R Joshi, J Jovicevic, X Ju, JJ Junggeburth, T Junkermann, A Juste Rozas, MK Juzek, S Kabana, A Kaczmarska, SA Kadir, M Kado, H Kagan, M Kagan, A Kahn, C Kahra, T Kaji, E Kajomovitz, N Kakati, N Kakoty, I Kalaitzidou, S Kandel, N Kanellos, NJ Kang, D Kar, E Karentzos, K Karki, O Karkout, SN Karpov, ZM Karpova, V Kartvelishvili, AN Karyukhin, E Kasimi, J Katzy, S Kaur, K Kawade, MP Kawale, C Kawamoto, T Kawamoto, EF Kay, S Kazakos, VF Kazanin, JM Keaveney, R Keeler, GV Kehris, JS Keller, JM Kelly, JJ Kempster, O Kepka, J Kerr, BP Kerridge, BP KerĆĄevan, L Keszeghova, RA Khan, A Khanov, AG Kharlamov, T Kharlamova, EE Khoda, M Kholodenko, TJ Khoo, G Khoriauli, Y Khoulaki, YAR Khwaira, B Kibirige, D Kim, DW Kim, YK Kim, N Kimura, MK Kingston, A Kirchhoff, C Kirfel, F Kirfel, J Kirk, AE Kiryunin, S Kita, O Kivernyk, M Klassen, C Klein, L Klein, MH Klein, SB Klein, U Klein, A Klimentov, T Klioutchnikova, P Kluit, S Kluth, E Kneringer, TM Knight, A Knue, M Kobel, D Kobylianskii, SF Koch, M Kocian, P KodyĆĄ, DM Koeck, T Koffas, O Kolay, I Koletsou, T Komarek, K Köneke, AXY Kong, T Kono, N Konstantinidis, P Kontaxakis, B Konya, R Kopeliansky, S Koperny, K Korcyl, K Kordas, A Korn, S Korn, I Korolkov, N Korotkova, B Kortman, O Kortner, S Kortner, WH Kostecka, M Kostov, VV Kostyukhin, A Kotsokechagia, A Kotwal, A Koulouris, A Kourkoumeli-Charalampidi, C Kourkoumelis, E Kourlitis, O Kovanda, R Kowalewski, W Kozanecki, AS Kozhin, VA Kramarenko, G Kramberger, P Kramer, MW Krasny, A Krasznahorkay, AC Kraus, JW Kraus, JA Kremer, NB Krengel, T Kresse, L Kretschmann, J Kretzschmar, P Krieger, K Krizka, K Kroeninger, H Kroha, J Kroll, J Kroll, KS Krowpman, U Kruchonak, H KrĂŒger, N Krumnack, MC Kruse, O Kuchinskaia, S Kuday, S Kuehn, R Kuesters, T Kuhl, V Kukhtin, Y Kulchitsky, S Kuleshov, J Kull, EV Kumar, M Kumar, N Kumari, P Kumari, A 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Abstract:

This Letter reports the observation of W + W − Îł triboson production in 140 fb − 1 of data collected by the ATLAS detector from proton–proton collisions at a centre-of-mass energy of s = 13 TeV at the LHC. Events with an opposite-charge e ÎŒ pair, a high transverse-momentum photon, and significant missing transverse momentum are considered. The observed (expected) significance of the signal is 5.9 (6.0) standard deviations. The measured fiducial cross-section, defined for the W + W − Îł → e ± ÎŒ ∓ Μ Μ ÂŻ Îł final state is 6.2 ± 0.8 (stat.) ± 0.6 (sys.) fb, in good agreement with the Standard Model prediction of 6.1 − 0.7 + 1.0 fb. Constraints on the Wilson coefficients of 13 dimension-8 operators describing physics beyond the Standard Model through anomalous quartic gauge-boson couplings are derived using the effective.