Searching for anomalous top quark interactions with proton tagging and timing detectors at the LHC

• Autor(a) principal: Baldenegro, Cristian
• Data de Publicação: 2022
• Outros Autores: Bellora, Andrea, Fichet, Sylvain [UNESP], von Gersdorff, Gero, Pitt, Michael, Royon, Christophe
• Tipo de documento: Artigo
• Idioma: eng
• Título da fonte: Repositório Institucional da UNESP
• Texto Completo: http://dx.doi.org/10.1007/JHEP08(2022)021; http://hdl.handle.net/11449/241474
• topic: Axions and ALPs; Other Weak Scale BSM Models; Specific BSM Phenomenol- ogy; Top Quark

We study the LHC sensitivity to new broad neutral resonances produced in two-photon fusion and decaying to a top quark pair, γγ → tt¯. This is probed in central exclusive tt¯ production in proton-proton collisions, pp → ptt¯ p. We use the tagging of the intact protons by PPS (CMS) and AFP (ATLAS) and consider the semi-leptonic tt¯ channel. The sensitivity is also mapped onto a set of dimension-8 γγtt¯ operators in the large mass limit. Using the kinematical correlations between the intact protons and the reconstructed tt¯ system, we obtain a sensitivity to the couplings of the dimension-8 operators of 1.4 10−11 GeV−4 at 95% CL. The sensitivity to the anomalous couplings is significantly improved down to about 7 10−12 GeV−4 if the proton time-of-flight is known with a precision of 20 ps in future measurements. The 95% CL sensitivity to broad neutral resonances reaches masses of order 1500 GeV when using timing information.