DUNE Phase II: Scientific Opportunities, Detector Concepts, Technological Solutions

(2024)

Authors:

DUNE Collaboration, A Abed Abud, B Abi, R Acciarri, MA Acero, MR Adames, G Adamov, M Adamowski, D Adams, M Adinolfi, C Adriano, A Aduszkiewicz, J Aguilar, F Akbar, K Allison, S Alonso Monsalve, M Alrashed, A Alton, R Alvarez, T Alves, H Amar, P Amedo, J Anderson, C Andreopoulos, M Andreotti, MP Andrews, F Andrianala, S Andringa, N Anfimov, A Ankowski, D Antic, M Antoniassi, M Antonova, A Antoshkin, A Aranda-Fernandez, L Arellano, E Arrieta Diaz, MA Arroyave, J Asaadi, A Ashkenazi, DM Asner, L Asquith, E Atkin, D Auguste, A Aurisano, V Aushev, D Autiero, MB Azam, F Azfar, A Back, H Back, JJ Back, I Bagaturia, L Bagby, N Balashov, S Balasubramanian, P Baldi, W Baldini, J Baldonedo, B Baller, B Bambah, R Banerjee, F Barao, D Barbu, G Barenboim, P Barham~Alzás, GJ Barker, W Barkhouse, G Barr, J Barranco Monarca, A Barros, N Barros, D Barrow, JL Barrow, A Basharina-Freshville, A Bashyal, V Basque, C Batchelor, L Bathe-Peters, JBR Battat, F Battisti, F Bay, MCQ Bazetto, JLL Bazo Alba, JF Beacom, E Bechetoille, B Behera, E Belchior, G Bell, L Bellantoni, G Bellettini, V Bellini, O Beltramello, N Benekos, C Benitez Montiel, D Benjamin, F Bento Neves, J Berger, S Berkman, J Bernal, P Bernardini, A Bersani, S Bertolucci, M Betancourt, A Betancur Rodríguez, A Bevan, Y Bezawada, AT Bezerra, TJ Bezerra, A Bhat, V Bhatnagar, J Bhatt, M Bhattacharjee, M Bhattacharya, S Bhuller, B Bhuyan, S Biagi, J Bian, K Biery, B Bilki, M Bishai, A Bitadze, A Blake, FD Blaszczyk, GC Blazey, E Blucher, A Bodek, J Bogenschuetz, J Boissevain, S Bolognesi, T Bolton, L Bomben, M Bonesini, C Bonilla-Diaz, F Bonini, A Booth, F Boran, S Bordoni, R Borges Merlo, A Borkum, N Bostan, R Bouet, J Boza, J Bracinik, B Brahma, D Brailsford, F Bramati, A Branca, A Brandt, J Bremer, C Brew, SJ Brice, V Brio, C Brizzolari, C Bromberg, J Brooke, A Bross, G Brunetti, M Brunetti, N Buchanan, H Budd, J Buergi, A Bundock, D Burgardt, S Butchart, G Caceres V., I Cagnoli, T Cai, R Calabrese, R Calabrese, J Calcutt, L Calivers, E Calvo, A Caminata, AF Camino, W Campanelli, A Campani, A Campos Benitez, N Canci, J Capó, I Caracas, D Caratelli, D Carber, JM Carceller, G Carini, B Carlus, MF Carneiro, P Carniti, I Caro Terrazas, H Carranza, N Carrara, L Carroll, T Carroll, A Carter, E Casarejos, D Casazza, JF Castaño Forero, FA Castaño, A Castillo, C Castromonte, E Catano-Mur, C Cattadori, F Cavalier, F Cavanna, S Centro, G Cerati, C Cerna, A Cervelli, A Cervera Villanueva, K Chakraborty, S Chakraborty, M Chalifour, A Chappell, N Charitonidis, A Chatterjee, H Chen, M Chen, WC Chen, Y Chen, Z Chen-Wishart, D Cherdack, C Chi, F Chiapponi, R Chirco, N Chitirasreemadam, K Cho, S Choate, D Chokheli, PS Chong, B Chowdhury, D Christian, A Chukanov, M Chung, E Church, MF Cicala, M Cicerchia, V Cicero, R Ciolini, P Clarke, G Cline, TE Coan, AG Cocco, JAB Coelho, A Cohen, J Collazo, J Collot, E Conley, JM Conrad, M Convery, S Copello, AFV Cortez, P Cova, C Cox, L Cremaldi, L Cremonesi, JI Crespo-Anadón, M Crisler, E Cristaldo, J Crnkovic, G Crone, R Cross, A Cudd, C Cuesta, Y Cui, F Curciarello, D Cussans, J Dai, O Dalager, R Dallavalle, W Dallaway, R D'Amico, H da Motta, ZA Dar, R Darby, L Da Silva Peres, Q David, GS Davies, S Davini, J Dawson, R De Aguiar, P De Almeida, P Debbins, I De Bonis, MP Decowski, A de Gouvêa, PC De Holanda, IL De Icaza Astiz, P De Jong, P Del Amo Sanchez, A De la Torre, G De Lauretis, A Delbart, D Delepine, M Delgado, A Dell'Acqua, G Delle Monache, N Delmonte, P De Lurgio, R Demario, G De Matteis, JRT de Mello Neto, DM DeMuth, S Dennis, C Densham, P Denton, GW Deptuch, A De Roeck, V De Romeri, JP Detje, J Devine, R Dharmapalan, M Dias, A Diaz, JS Díaz, F Díaz, F Di Capua, A Di Domenico, S Di Domizio, S Di Falco, L Di Giulio, P Ding, L Di Noto, E Diociaiuti, C Distefano, R Diurba, M Diwan, Z Djurcic, D Doering, S Dolan, F Dolek, MJ Dolinski, D Domenici, L Domine, S Donati, Y Donon, S Doran, D Douglas, TA Doyle, A Dragone, F Drielsma, L Duarte, D Duchesneau, K Duffy, K Dugas, P Dunne, B Dutta, H Duyang, DA Dwyer, AS Dyshkant, S Dytman, M Eads, A Earle, S Edayath, D Edmunds, J Eisch, P Englezos, A Ereditato, T Erjavec, CO Escobar, JJ Evans, E Ewart, AC Ezeribe, K Fahey, L Fajt, A Falcone, M Fani', C Farnese, S Farrell, Y Farzan, D Fedoseev, J Felix, Y Feng, E Fernandez-Martinez, D Fernández-Posada, G Ferry, E Fialova, L Fields, P Filip, A Filkins, F Filthaut, R Fine, G Fiorillo, M Fiorini, S Fogarty, W Foreman, J Fowler, J Franc, K Francis, D Franco, J Franklin, J Freeman, J Fried, A Friedland, S Fuess, IK Furic, K Furman, AP Furmanski, R Gaba, A Gabrielli, A M~Gago, F Galizzi, H Gallagher, N Gallice, V Galymov, E Gamberini, T Gamble, F Ganacim, R Gandhi, S Ganguly, F Gao, S Gao, D Garcia-Gamez, MÁ García-Peris, F Gardim, S Gardiner, D Gastler, A Gauch, J Gauvreau, P Gauzzi, S Gazzana, G Ge, N Geffroy, B Gelli, S Gent, L Gerlach, Z Ghorbani-Moghaddam, T Giammaria, D Gibin, I Gil-Botella, S Gilligan, A Gioiosa, S Giovannella, C Girerd, AK Giri, C Giugliano, V Giusti, D Gnani, O Gogota, S Gollapinni, K Gollwitzer, RA Gomes, LV Gomez Bermeo, LS Gomez Fajardo, F Gonnella, D Gonzalez-Diaz, M Gonzalez-Lopez, MC Goodman, S Goswami, C Gotti, J Goudeau, E Goudzovski, C Grace, E Gramellini, R Gran, E Granados, P Granger, C Grant, DR Gratieri, G Grauso, P Green, S Greenberg, J Greer, WC Griffith, FT Groetschla, K Grzelak, L Gu, W Gu, V Guarino, M Guarise, R Guenette, M Guerzoni, D Guffanti, A Guglielmi, B Guo, FY Guo, A Gupta, V Gupta, G Gurung, D Gutierrez, P Guzowski, MM Guzzo, S Gwon, A Habig, H Hadavand, L Haegel, R Haenni, L Hagaman, A Hahn, J Haiston, J Hakenmüller, T Hamernik, P Hamilton, J Hancock, F Happacher, DA Harris, A Hart, J Hartnell, T Hartnett, J Harton, T Hasegawa, CM Hasnip, R Hatcher, K Hayrapetyan, J Hays, E Hazen, M He, A Heavey, KM Heeger, J Heise, P Hellmuth, S Henry, J Hernández-García, K Herner, V Hewes, A Higuera, C Hilgenberg, SJ Hillier, A Himmel, E Hinkle, LR Hirsch, J Ho, J Hoff, A Holin, T Holvey, E Hoppe, S Horiuchi, GA Horton-Smith, T Houdy, B Howard, R Howell, I Hristova, MS Hronek, J Huang, RG Huang, Z Hulcher, M Ibrahim, G Iles, N Ilic, AM Iliescu, R Illingworth, G Ingratta, A Ioannisian, B Irwin, L Isenhower, M Ismerio Oliveira, R Itay, CM Jackson, V Jain, E James, W Jang, B Jargowsky, D Jena, I Jentz, X Ji, C Jiang, J Jiang, L Jiang, A Jipa, JH Jo, FR Joaquim, W Johnson, C Jollet, B Jones, R Jones, N Jovancevic, M Judah, CK Jung, T Junk, Y Jwa, M Kabirnezhad, AC Kaboth, I Kadenko, I Kakorin, A Kalitkina, D Kalra, M Kandemir, DM Kaplan, G Karagiorgi, G Karaman, A Karcher, Y Karyotakis, S Kasai, SP Kasetti, L Kashur, I Katsioulas, A Kauther, N Kazaryan, L Ke, E Kearns, PT Keener, KJ Kelly, E Kemp, O Kemularia, Y Kermaidic, W Ketchum, SH Kettell, M Khabibullin, N Khan, A Khvedelidze, D Kim, J Kim, MJ Kim, B King, B Kirby, M Kirby, A Kish, J Klein, J Kleykamp, A Klustova, T Kobilarcik, L Koch, K Koehler, LW Koerner, DH Koh, L Kolupaeva, D Korablev, M Kordosky, T Kosc, U Kose, VA Kostelecký, K Kothekar, I Kotler, M Kovalcuk, V Kozhukalov, W Krah, R Kralik, M Kramer, L Kreczko, F Krennrich, I Kreslo, T Kroupova, S Kubota, M Kubu, Y Kudenko, VA Kudryavtsev, G Kufatty, S Kuhlmann, S Kulagin, J Kumar, P Kumar, S Kumaran, J Kunzmann, R Kuravi, N Kurita, C Kuruppu, V Kus, T Kutter, M Kuźniak, J Kvasnicka, T Labree, T Lackey, I Lalău, A Lambert, BJ Land, CE Lane, N Lane, K Lang, T Langford, M Langstaff, F Lanni, O Lantwin, J Larkin, P Lasorak, D Last, A Laudrain, A Laundrie, G Laurenti, E Lavaut, P Laycock, I Lazanu, R LaZur, M Lazzaroni, T Le, S Leardini, J Learned, T LeCompte, V Legin, G Lehmann Miotto, R Lehnert, MA Leigui de Oliveira, M Leitner, D Leon Silverio, LM Lepin, J -Y~Li, SW Li, Y Li, H Liao, CS Lin, D Lindebaum, S Linden, RA Lineros, A Lister, BR Littlejohn, H Liu, J Liu, Y Liu, S Lockwitz, M Lokajicek, I Lomidze, K Long, TV Lopes, J Lopez, I López de Rego, N López-March, T Lord, JM LoSecco, WC Louis, A Lozano Sanchez, X-G Lu, KB Luk, B Lunday, X Luo, E Luppi, D MacFarlane, AA Machado, P Machado, CT Macias, JR Macier, M MacMahon, A Maddalena, A Madera, P Madigan, S Magill, C Magueur, K Mahn, A Maio, A Major, K Majumdar, S Mameli, M Man, RC Mandujano, J Maneira, S Manly, A Mann, K Manolopoulos, M Manrique Plata, S Manthey Corchado, VN Manyam, M Marchan, A Marchionni, W Marciano, D Marfatia, C Mariani, J Maricic, F Marinho, AD Marino, T Markiewicz, F Das Chagas Marques, C Marquet, M Marshak, CM Marshall, J Marshall, L Martina, J Martín-Albo, N Martinez, DA Martinez Caicedo, F Martínez López, P Martínez Miravé, S Martynenko, V Mascagna, C Massari, A Mastbaum, F Matichard, S Matsuno, G Matteucci, J Matthews, C Mauger, N Mauri, K Mavrokoridis, I Mawby, R Mazza, T McAskill, N McConkey, KS McFarland, C McGrew, A McNab, L Meazza, VCN Meddage, A Mefodiev, B Mehta, P Mehta, P Melas, O Mena, H Mendez, P Mendez, DP Méndez, A Menegolli, G Meng, ACEA Mercuri, A Meregaglia, MD Messier, S Metallo, W Metcalf, M Mewes, H Meyer, T Miao, J Micallef, A Miccoli, G Michna, R Milincic, F Miller, G Miller, W Miller, O Mineev, A Minotti, L Miralles, OG Miranda, C Mironov, S Miryala, S Miscetti, CS Mishra, P Mishra, SR Mishra, A Mislivec, M Mitchell, D Mladenov, I Mocioiu, A Mogan, N Moggi, R Mohanta, TA Mohayai, N Mokhov, J Molina, L Molina Bueno, E Montagna, A Montanari, C Montanari, D Montanari, D Montanino, LM Montaño Zetina, M Mooney, AF Moor, Z Moore, D Moreno, O Moreno-Palacios, L Morescalchi, D Moretti, R Moretti, C Morris, C Mossey, CA Moura, G Mouster, W Mu, L Mualem, J Mueller, M Muether, F Muheim, A Muir, M Mulhearn, D Munford, LJ Munteanu, H Muramatsu, J Muraz, M Murphy, T Murphy, J Muse, A Mytilinaki, J Nachtman, Y Nagai, S Nagu, R Nandakumar, D Naples, S Narita, A Navrer-Agasson, N Nayak, M Nebot-Guinot, A Nehm, JK Nelson, O Neogi, J Nesbit, M Nessi, D Newbold, M Newcomer, R Nichol, F Nicolas-Arnaldos, A Nikolica, J Nikolov, E Niner, K Nishimura, A Norman, A Norrick, P Novella, A Nowak, JA Nowak, M Oberling, JP Ochoa-Ricoux, S Oh, SB Oh, A Olivier, A Olshevskiy, T Olson, Y Onel, Y Onishchuk, A Oranday, GD Orebi Gann, M Osbiston, JA Osorio Vélez, L O'Sullivan, L Otiniano Ormachea, J Ott, L Pagani, G Palacio, O Palamara, S Palestini, JM Paley, M Pallavicini, C Palomares, S Pan, P Panda, W Panduro Vazquez, E Pantic, V Paolone, R Papaleo, A Papanestis, D Papoulias, S Paramesvaran, A Paris, S Parke, E Parozzi, S Parsa, Z Parsa, S Parveen, M Parvu, D Pasciuto, S Pascoli, L Pasqualini, J Pasternak, C Patrick, L Patrizii, RB Patterson, T Patzak, A Paudel, L Paulucci, Z Pavlovic, G Pawloski, D Payne, V Pec, E Pedreschi, SJM Peeters, W Pellico, A Pena Perez, E Pennacchio, A Penzo, OLG Peres, YF Perez Gonzalez, L Pérez-Molina, C Pernas, J Perry, D Pershey, G Pessina, G Petrillo, C Petta, R Petti, M Pfaff, V Pia, L Pickering, F Pietropaolo, VL Pimentel, G Pinaroli, S Pincha, J Pinchault, K Pitts, K Plows, C Pollack, T Pollman, F Pompa, X Pons, N Poonthottathil, V Popov, F Poppi, J Porter, LG Porto Paix{ã}o, M Potekhin, R Potenza, J Pozimski, M Pozzato, T Prakash, C Pratt, M Prest, F Psihas, D Pugnere, X Qian, J Queen, JL Raaf, V Radeka, J Rademacker, B Radics, F Raffaelli, A Rafique, E Raguzin, M Rai, S Rajagopalan, M Rajaoalisoa, I Rakhno, L Rakotondravohitra, L Ralte, MA Ramirez Delgado, B Ramson, A Rappoldi, G Raselli, P Ratoff, R Ray, H Razafinime, EM Rea, JS Real, B Rebel, R Rechenmacher, J Reichenbacher, SD Reitzner, H Rejeb Sfar, E Renner, A Renshaw, S Rescia, F Resnati, Diego~Restrepo, C Reynolds, M Ribas, S Riboldi, C Riccio, G Riccobene, JS Ricol, M Rigan, EV Rincón, A Ritchie-Yates, S Ritter, D Rivera, R Rivera, A Robert, JL Rocabado Rocha, L Rochester, M Roda, P Rodrigues, MJ Rodriguez Alonso, J Rodriguez Rondon, S Rosauro-Alcaraz, P Rosier, D Ross, M Rossella, M Rossi, M Ross-Lonergan, N Roy, P Roy, C Rubbia, A Ruggeri, G Ruiz, B Russell, D Ruterbories, A Rybnikov, S Sacerdoti, S Saha, SK Sahoo, N Sahu, P Sala, N Samios, O Samoylov, MC Sanchez, A Sánchez Bravo, A Sánchez-Castillo, P Sanchez-Lucas, V Sandberg, DA Sanders, S Sanfilippo, D Sankey, D Santoro, N Saoulidou, P Sapienza, C Sarasty, I Sarcevic, I Sarra, G Savage, V Savinov, G Scanavini, A Scaramelli, A Scarff, T Schefke, H Schellman, S Schifano, P Schlabach, D Schmitz, AW Schneider, K Scholberg, A Schukraft, B Schuld, A Segade, E Segreto, A Selyunin, D Senadheera, CR Senise, J Sensenig, SH Seo, MH Shaevitz, P Shanahan, P Sharma, R Kumar, S Sharma Poudel, K Shaw, T Shaw, K Shchablo, J Shen, C Shepherd-Themistocleous, A Sheshukov, J Shi, W Shi, S Shin, S Shivakoti, I Shoemaker, D Shooltz, R Shrock, B Siddi, M Siden, J Silber, L Simard, J Sinclair, G Sinev, J Singh, L Singh, P Singh, V Singh, S Singh Chauhan, R Sipos, C Sironneau, G Sirri, K Siyeon, K Skarpaas, J Smedley, E Smith, J Smith, P Smith, J Smolik, M Smy, M Snape, EL Snider, P Snopok, D Snowden-Ifft, M Soares Nunes, H Sobel, M Soderberg, S Sokolov, CJ Solano Salinas, S Söldner-Rembold, N Solomey, V Solovov, WE Sondheim, M Sorel, A Sotnikov, J Soto-Oton, A Sousa, K Soustruznik, F Spinella, J Spitz, NJC Spooner, K Spurgeon, D Stalder, M Stancari, L Stanco, J Steenis, R Stein, HM Steiner, AF Steklain Lisbôa, A Stepanova, J Stewart, B Stillwell, J Stock, F Stocker, T Stokes, M Strait, T Strauss, L Strigari, A Stuart, JG Suarez, J Subash, A Surdo, L Suter, CM Sutera, K Sutton, Y Suvorov, R Svoboda, SK Swain, B Szczerbinska, AM Szelc, A Sztuc, A Taffara, N Talukdar, J Tamara, HA Tanaka, S Tang, N Taniuchi, AM Tapia Casanova, B Tapia Oregui, A Tapper, S Tariq, E Tarpara, E Tatar, R Tayloe, D Tedeschi, AM Teklu, J Tena Vidal, P Tennessen, M Tenti, K Terao, F Terranova, G Testera, T Thakore, A Thea, S Thomas, A Thompson, C Thorn, SC Timm, E Tiras, V Tishchenko, N Todorović, L Tomassetti, A Tonazzo, D Torbunov, M Torti, M Tortola, F Tortorici, N Tosi, D Totani, M Toups, C Touramanis, D Tran, R Travaglini, J Trevor, E Triller, S Trilov, J Truchon, D Truncali, WH Trzaska, Y Tsai, Y-T Tsai, Z Tsamalaidze, KV Tsang, N Tsverava, SZ Tu, S Tufanli, C Tunnell, S Turnberg, J Turner, M Tuzi, J Tyler, E Tyley, M Tzanov, MA Uchida, J Ureña González, J Urheim, T Usher, H Utaegbulam, S Uzunyan, MR Vagins, P Vahle, S Valder, GA Valdiviesso, E Valencia, R Valentim, Z Vallari, E Vallazza, JWF Valle, R Van Berg, RG Van de Water, DV Forero, A Vannozzi, M Van Nuland-Troost, F Varanini, D Vargas Oliva, S Vasina, N Vaughan, K Vaziri, A Vázquez-Ramos, J Vega, S Ventura, A Verdugo, S Vergani, M Verzocchi, K Vetter, M Vicenzi, H Vieira de Souza, C Vignoli, C Vilela, E Villa, S Viola, B Viren, AP Vizcaya Hernandez, Q Vuong, AV Waldron, M Wallbank, J Walsh, T Walton, H Wang, J Wang, L Wang, MHLS Wang, X Wang, Y Wang, K Warburton, D Warner, L Warsame, MO Wascko, D Waters, A Watson, K Wawrowska, A Weber, CM Weber, M Weber, H Wei, A Weinstein, S Westerdale, M Wetstein, K Whalen, A White, A White, LH Whitehead, D Whittington, J Wilhlemi, MJ Wilking, A Wilkinson, C Wilkinson, F Wilson, RJ Wilson, P Winter, W Wisniewski, J Wolcott, J Wolfs, T Wongjirad, A Wood, K Wood, E Worcester, M Worcester, M Wospakrik, K Wresilo, C Wret, S Wu, W Wu, W Wu, M Wurm, J Wyenberg, Y Xiao, I Xiotidis, B Yaeggy, N Yahlali, E Yandel, J Yang, K Yang, T Yang, A Yankelevich, N Yershov, K Yonehara, T Young, B Yu, H Yu, J Yu, Y Yu, W Yuan, R Zaki, J Zalesak, L Zambelli, B Zamorano, A Zani, O Zapata, L Zazueta, GP Zeller, J Zennamo, K Zeug, C Zhang, S Zhang, M Zhao, E Zhivun, ED Zimmerman, S Zucchelli, J Zuklin, V Zutshi, R Zwaska

Measurement of differential cross-sections in t t ¯ and t t ¯ +jets production in the lepton+jets final state in pp collisions at s = 13 TeV using 140 fb − 1 of ATLAS data

Journal of High Energy Physics Springer 2024:8 (2024) 182

Authors:

G Aad, B Abbott, K Abeling, NJ Abicht, SH Abidi, A Aboulhorma, H Abramowicz, H Abreu, Y Abulaiti, BS Acharya, C Adam Bourdarios, L Adamczyk, SV Addepalli, MJ Addison, J Adelman, A Adiguzel, T Adye, AA Affolder, Y Afik, MN Agaras, J Agarwala, A Aggarwal, C Agheorghiesei, A Ahmad

Abstract:

Differential cross-sections for top-quark pair production, inclusively and in association with jets, are measured in pp collisions at a centre-of-mass energy of 13 TeV with the ATLAS detector at the LHC using an integrated luminosity of 140 fb−1. The events are selected with one charged lepton (electron or muon) and at least four jets. The differential cross-sections are presented at particle level as functions of several jet observables, including angular correlations, jet transverse momenta and invariant masses of the jets in the final state, which characterise the kinematics and dynamics of the top-antitop system and the hard QCD radiation in the system with associated jets. The typical precision is 5%–15% for the absolute differential cross-sections and 2%–4% for the normalised differential cross-sections. Next-to-leading-order and next-to-next-to-leading-order QCD predictions are found to provide an adequate description of the rate and shape of the jet-angular observables. The description of the transverse momentum and invariant mass observables is improved when next-to-next-to-leading-order QCD corrections are included.

Search for non-resonant Higgs boson pair production in final states with leptons, taus, and photons in pp collisions at s = 13 TeV with the ATLAS detector

Journal of High Energy Physics Springer 2024:8 (2024) 164

Authors:

G Aad, E Aakvaag, B Abbott, S Abdelhameed, K Abeling, NJ Abicht, SH Abidi, M Aboelela, A Aboulhorma, H Abramowicz, H Abreu, 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

Abstract:

A search is presented for non-resonant Higgs boson pair production, targeting the bbZZ, 4V (V = W or Z), VVττ, 4τ, γγVV and γγττ decay channels. Events are categorised based on the multiplicity of light charged leptons (electrons or muons), hadronically decaying tau leptons, and photons. The search is based on a data sample of proton-proton collisions at s = 13 TeV recorded with the ATLAS detector during Run 2 of the Large Hadron Collider, corresponding to an integrated luminosity of 140 fb−1. No evidence of the signal is found and the observed (expected) upper limit on the cross-section for non-resonant Higgs boson pair production is determined to be 17 (11) times the Standard Model predicted cross-section at 95% confidence level under the background-only hypothesis. The observed (expected) constraints on the HHH coupling modifier, κλ, are determined to be −6.2 < κλ< 11.6 (−4.5 < κλ< 9.6) at 95% confidence level, assuming the Standard Model for the expected limits and that new physics would only affect κλ.

Combination of searches for Higgs boson decays into a photon and a massless dark photon using pp collisions at s = 13 TeV with the ATLAS detector

Journal of High Energy Physics Springer 2024:8 (2024) 153

Authors:

G Aad, E Aakvaag, B Abbott, S Abdelhameed, K Abeling, NJ Abicht, SH Abidi, M Aboelela, A Aboulhorma, H Abramowicz, H Abreu, 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

Abstract:

A combination of searches for Higgs boson decays into a visible photon and a massless dark photon (H → γγd) is presented using 139 fb−1 of proton-proton collision data at a centre-of-mass energy of s = 13 TeV recorded by the ATLAS detector at the Large Hadron Collider. The observed (expected) 95% confidence level upper limit on the Standard Model Higgs boson decay branching ratio is determined to be B(H → γγd) < 1.3% (1.5)%. The search is also sensitive to higher-mass Higgs bosons decaying into the same final state. The observed (expected) 95% confidence level limit on the cross-section times branching ratio ranges from 16 fb (20 fb) for mH = 400 GeV to 1.0 fb (1.5 fb) for mH = 3 TeV. Results are also interpreted in the context of a minimal simplified model.

Search for leptoquark pair production decaying into t e - t ¯ e + or t μ - t ¯ μ + in multi-lepton final states in pp collisions at s = 13 TeV with the ATLAS detector

The European Physical Journal C SpringerOpen 84:8 (2024) 818

Authors:

G Aad, B Abbott, DC Abbott, K Abeling, SH Abidi, A Aboulhorma, H Abramowicz, H Abreu, Y Abulaiti, AC Abusleme Hoffman, BS Acharya, B Achkar, C Adam Bourdarios, L Adamczyk, L Adamek, SV Addepalli, J Adelman, A Adiguzel, S Adorni, T Adye, AA Affolder, Y Afik, MN Agaras, J Agarwala

Abstract:

A search for leptoquark pair production decaying into te-t¯e+ or tμ-t¯μ+ in final states with multiple leptons is presented. The search is based on a dataset of pp collisions at s=13TeV recorded with the ATLAS detector during Run 2 of the Large Hadron Collider, corresponding to an integrated luminosity of 139 fb-1. Four signal regions, with the requirement of at least three light leptons (electron or muon) and at least two jets out of which at least one jet is identified as coming from a b-hadron, are considered based on the number of leptons of a given flavour. The main background processes are estimated using dedicated control regions in a simultaneous fit with the signal regions to data. No excess above the Standard Model background prediction is observed and 95% confidence level limits on the production cross section times branching ratio are derived as a function of the leptoquark mass. Under the assumption of exclusive decays into te- (tμ-), the corresponding lower limit on the scalar mixed-generation leptoquark mass mLQmixd is at 1.58 (1.59) TeV and on the vector leptoquark mass mU~1 at 1.67 (1.67) TeV in the minimal coupling scenario and at 1.95 (1.95) TeV in the Yang–Mills scenario.