Report of the Topical Group on Electroweak Precision Physics and Constraining New Physics for Snowmass 2021

• Published in: arXiv.org 2022-11
• Main Authors: Belloni, Alberto, Freitas, Ayres, Tian, Junping, Juan Alcaraz Maestre Aram Apyan, Azartash-Namin, Bianca, Azzurri, Paolo, Banerjee, Swagato, Beyer, Jakob, Bhattacharya, Saptaparna, de Blas, Jorge, Blondel, Alain, Britzger, Daniel, Dam, Mogens, Du, Yong, d'Enterria, David, Fujii, Keisuke, Grojean, Christophe, Gu, Jiayin, Han, Tao, Hildreth, Michael, Irles, Adrián, Janot, Patrick, Jeans, Daniel, Kawale, Mayuri, Khoda, Elham E, Lane, Samuel, Lewis, Ian, Liang, Zhijun, List, Jenny, Liu, Zhen, Yang, Ma, Miralles, Victor, Mizuno, Takahiro, Mwewa, Chilufya, Narain, Meenakshi, Nedic, Luka, Neubauer, Mark S, Paranjape, Chaitanya, Peskin, Michael, Petti, Roberto, Marc-André Pleier, Poeschl, Roman, Potamianos, Karolos, Reina, Laura, Reuter, Jürgen, Robens, Tania, Roloff, Philipp, Roney, Michael, Ruan, Manqi, Ruiz, Richard, Schuy, Alex, Shepherd, William, Stolarski, Daniel, Stupak, John, Suehara, Taikan, Tenchini, Roberto, Tricoli, Alessandro, Vryonidou, Eleni, Vos, Marcel, Waits, Connor, Wilson, Graham, Wu, Yongcheng, Xie, Keping, Yang, Siqi, Yang, Tianyi, Yumino, Keita, Shuang-Yong Zhou, Zhu, Junjie
• Format: Article
• Language: English
• Subjects: Bosons; Constraint modelling; Electroweak model; Fermions; Field theory; Gluons; Physics; Scattering; Searching; Standard model (particle physics)
• ISSN: 2331-8422

The precise measurement of physics observables and the test of their consistency within the standard model (SM) are an invaluable approach, complemented by direct searches for new particles, to determine the existence of physics beyond the standard model (BSM). Studies of massive electroweak gauge bosons (W and Z bosons) are a promising target for indirect BSM searches, since the interactions of photons and gluons are strongly constrained by the unbroken gauge symmetries. They can be divided into two categories: (a) Fermion scattering processes mediated by s- or t-channel W/Z bosons, also known as electroweak precision measurements; and (b) multi-boson processes, which include production of two or more vector bosons in fermion-antifermion annihilation, as well as vector boson scattering (VBS) processes. The latter categories can test modifications of gauge-boson self-interactions, and the sensitivity is typically improved with increased collision energy. This report evaluates the achievable precision of a range of future experiments, which depend on the statistics of the collected data sample, the experimental and theoretical systematic uncertainties, and their correlations. In addition it presents a combined interpretation of these results, together with similar studies in the Higgs and top sector, in the Standard Model effective field theory (SMEFT) framework. This framework provides a model-independent prescription to put generic constraints on new physics and to study and combine large sets of experimental observables, assuming that the new physics scales are significantly higher than the EW scale.