report from working group 2

• DOI: 10.48550/arxiv.1902.00134
• Publication Date: 2019-01-01
• Authors: Cepeda, M.; Gori, S.; Ilten, P.; Kado, M.; Riva, F.; Khalek, R. Abdul; Aboubrahim, A.; Alimena, J.; Alioli, S.; Alves, A.; Asawatangtrakulde...; Azatov, A.; Azzi, P.; Bailey, S.; Banerjee, S.; Barberio, E. L.; Barducci, D.; Barone, G.; Bauer, M.; Bautista, C.; Bechtle, P.; Becker, K.; Benaglia, A.; Bengala, M.; Berger, N.; Bertella, C.; Bethani, A.; Betti, A.; Biekotter, A.; Bishara, F.; Bloch, D.; Bokan, P.; Bondu, O.; Bonvini, M.; Borgonovi, L.; Borsato, M.; Boselli, S.; Braibant-Giacomel...; Buchalla, G.; Cadamuro, L.; Caillol, C.; Calandri, A.; Tazon, A. Calderon; Campbell, J. M.; Caola, F.; Capozi, M.; Carena, M.; Calame, C. M. Car...; Carmona, A.; Carquin, E.; De Oliveira, A. C...; Hernandez, A. Cas...; Cata, O.; Celis, A.; Cerri, A.; Cerutti, F.; Chahal, G. S.; Chakraborty, A.; Chaudhary, G.; Chen, X.; Chisholm, A. S.; Contino, R.; Costa, A. J.; Covarelli, R.; Craig, N.; Curtin, D.; D'Eramo, L.; Dang, N. P.; Das, P.; Dawson, S.; Francisco, O. A. ...; de Blas, J.; De Curtis, S.; De Filippis, N.; De la Torre, H.; de Lima, L.; De Wit, A.; Delaere, C.; Delcourt, M.; Delmastro, M.; Demers, S.; Dev, N.; Di Nardo, R.; Di Vita, S.; Dildick, S.; Prado, L. A. F. do; Donadelli, M.; Du, D.; Durieux, G.; D��hrssen, M.; Eberhardt, O.; Morabit, K. El; Elias-Miro, J.; Ellis, J.; Englert, C.; Essig, R.; Falke, S.; Farina, M.; Ferrari, A.; Ferroglia, A.; Fiolhais, M. C. N.; Flechl, M.; Folgueras, S.; Fontanesi, E.; Francavilla, P.; Franceschini, R.; Frederix, R.; Frixione, S.; G��mez-Ceballos, G.; Gabrielli, A.; Gadatsch, S.; Gallinaro, M.; Gandrakota, A.; Gao, J.; Walls, F. M. Garay; Gehrmann, T.; Gershtein, Y.; Ghosh, T.; Gilbert, A.; Glein, R.; Glover, E. W. N.; Gomez-Ambrosio, R.; Gon��alo, R.; Gon��alves, D.; Gorbahn, M.; Gouveia, E.; Gouzevitch, M.; Govoni, P.; Grazzini, M.; Greenberg, B.; Grimm, K.; Gritsan, A. V.; Grohsjean, A.; Grojean, C.; Gu, J.; Gugel, R.; Gupta, R. S.; Gwilliam, C. B.; H��che, S.; Haacke, M.; Haddad, Y.; Haisch, U.; Hamity, G. N.; Han, T.; Harland-Lang, L. A.; Harnik, R.; Heinemeyer, S.; Heinrich, G.; Henning, B.; Hirschi, V.; Hoepfner, K.; Hogan, J. M.; Homiller, S.; Huang, Y.; Huss, A.; J��z��quel, S.; Jain, Sa.; Jones, S. P.; K��neke, K.; Kalinowski, J.; Kamenik, J. F.; Kaplan, M.; Karlberg, A.; Kaur, M.; Keicher, P.; Kerner, M.; Khanov, A.; Kieseler, J.; Kim, J. H.; Kim, M.; Klijnsma, T.; Kling, F.; Klute, M.; Komaragiri, J. R.; Kong, K.; Kozaczuk, J.; Kozow, P; Krause, C.; Lai, S.; Langford, J.; Le, B.; Lechner, L.; Leight, W. A.; Leney, K. J. C.; Lenz, T.; Li, C-Q.; Li, H.; Li, Q.; Liebler, S.; Lindert, J.; Liu, D.; Liu, J.; Liu, Y.; Liu, Z.; Lombardo, D.; Long, A.; Long, K.; Low, I.; Luisoni, G.; Ma, L. L.; Majumder, D.; Maltoni, F.; Marchiori, G.; Marini, A. C.; Martin, A.; Marzani, S.; Massironi, A.; Matheus, R. D.; Meridiani, P.; Milosevic, V.; Mimasu, K.; Mistlberger, B.; Monni, P. F.; Murray, W. J.; Nath, P.; Neubert, M.; Nikolopoulos, K.; Nisati, A.; Pino, S. A. Olivares; Griso, S. Pagan; Pagani, D.; Cortezon, E. Pale...; Panico, G.; Pappadopulo, D.; Petrucciani, G.; Piccinini, F.; Pieri, M.; Plehn, T.; Pozzorini, S.; Re, E.; Riembau, M.; Rompotis, N.; Salvucci, A.; Santiago, J.; Sanz, V.; Schmidt, A.; Schneider, B.; Schoefbeck, R.; Scodeggio, M.; Scyboz, L.; Shao, H. -S.; Shivaji, A.; Silvestrini, L.; Simon, L.; Soreq, Y.; Spira, M.; Strong, G.; Tackmann, K.; Thamm, A.; Thomsen, L. A.; Torre, R.; Vantalon, T.; Verducci, M.; Vernieri, C.; Vickey, T.; Vischia, P.; Vryonidou, E.; Wardle, N.; Wardrope, D. R.; Wielers, M.; Wulzer, A.; Xiao, M.; Yang, H. T.; Yazgan, E.; Yin, Z.; Yu, F.; Zanzi, D.; Zaro, M.; Zenz, S. C.; Zhang, L.; Zhang, W.; Zhao, X.; Zhong, Y. -M.
• Keywords: rare decay; p p: scattering; [PHYS.HEXP] Physics [physics]/High Energy Physics - Experiment [hep-ex]; Higgs particle: decay; High Energy Physics - HL-LHC; HE-LHC - Phenomenology; High Energy Physics - Phenomenology; High Energy Physics - Experiment; electroweak interaction: symmetry breaking; Physics of Elementary Particles and Fields; FOS: Physical sciences; 7. Clean energy; 530; 01 natural sciences; High Energy Physics - Experiment; High Energy Physics - Experiment (hep-ex); SDG 17 - Partnerships for the Goals; High Energy Physics - Phenomenology (hep-ph); Higgs Physics; collider; lhc; 539; CERN LHC Coll: upgrade; 0103 physical sciences; High Energy Physics - Phenomenology; High Energy Physics - Phenomenology; High Energy Physics - Experiment; [PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex]; energy: high; CMS; new physics; hep-ex; 500; hep-ph; ATLAS; [PHYS.HPHE] Physics [physics]/High Energy Physics - Phenomenology [hep-ph]; High Energy Physics - Phenomenology; Higgs particle: production; [PHYS.HPHE]Physics [physics]/High Energy Physics - Phenomenology [hep-ph]; luminosity: high

The discovery of the Higgs boson in 2012, by the ATLAS and CMS experiments, was a success achieved with only a percent of the entire dataset foreseen for the LHC. It opened a landscape of possibilities in the study of Higgs boson properties, Electroweak Symmetry breaking and the Standard Model in general, as well as new avenues in probing new physics beyond the Standard Model. Six years after the discovery, with a conspicuously larger dataset collected during LHC Run 2 at a 13 TeV centre-of-mass energy, the theory and experimental particle physics communities have started a meticulous exploration of the potential for precision measurements of its properties. This includes studies of Higgs boson production and decays processes, the search for rare decays and production modes, high energy observables, and searches for an extended electroweak symmetry breaking sector. This report summarises the potential reach and opportunities in Higgs physics during the High Luminosity phase of the LHC, with an expected dataset of pp collisions at 14 TeV, corresponding to an integrated luminosity of 3 ab$^{-1}$. These studies are performed in light of the most recent analyses from LHC collaborations and the latest theoretical developments. The potential of an LHC upgrade, colliding protons at a centre-of-mass energy of 27 TeV and producing a dataset corresponding to an integrated luminosity of 15 ab$^{-1}$, is also discussed.<br/>CERN Yellow Reports: Monographs, Vol. 7 (2019): Physics of the HL-LHC, and perspectives at the HE-LHC<br/>