2024: the search for new physics continues with CMS

2024: the search for new physics continues with CMS

The CMS group at IP2I has recently finalised four analyses of the 138 fb-1 of data collected during collisions at √s = 13 TeV in LHC Run 2 between 2016 and 2018. Their results have given rise to four papers submitted for publication by the CMS collaboration.
While these results have not yet revealed any physical phenomena beyond the Standard Model, they have pushed back its limits. The search for additional Higgs bosons continues at low mass [1] or in association with a standard Higgs boson [2], in order to understand how the mass of particles appeared at the time of the Big Bang and to explain how antimatter subsequently disappeared.
New vector quarks [3] are also being sought, the existence of which would make it possible to solve the so-called “hierarchy” problem, according to which the quantum corrections to the mass of the Higgs boson diverge at high energy scales.
Finally, an investigation into the validity of special relativity [4] was carried out with top quarks, achieving a precision up to 100 times better than at the Tevatron.

The analysis teams are now tackling the Run 3 data at √s = 13.6 TeV in order to answer the questions left unanswered after Run 2. The CMS group at IP2I has also co-ordinated the paper describing the CMS configuration for Run 3 [5].

[1] Search for a standard model-like Higgs boson in the mass range between 70 and 110 GeV in the diphoton final state in proton-proton collisions at √s=13 TeV arXiv:2405.18149, soumis à Physics Letters B. Voir aussi le briefing en anglais https://cms.cern/news/what-if-there-was-second-and-lighter-higgs-boson (Contact Suzanne Gascon-Shotkin)

[2] Search for a new resonance decaying into two spin-0 bosons in a final state with two photons and two bottom quarks in proton-proton collisions at √s = 13 TeV, JHEP 05 (2024) 316 et Searches for Higgs boson production through decays of heavy resonances, arXiv:2403.16926, soumis à Physics Report (Contact : Maxime Gouzevich et Elise Jourd’huy)

[3] Search for production of a single vector-like quark decaying to tH or tZ in the all-hadronic final state in pp collisions at √s = 13 TeV, arXiv:2405.05071, soumis à Physical Review D. (Contact : Stéphanie Beauceron)

[4] Searches for violation of Lorentz invariance in tt¯ production using dilepton events in proton-proton collisions at √s = 13 TeV, https://arxiv.org/abs/2405.14757, soumis à Physics Letters B. (Contact : Nicolas Chanon)

[5] Development of the CMS detector for the CERN LHC Run 3, https://arxiv.org/abs/2309.05466, JINST 19 (2024) P05064 (Contact : Gaëlle Boudoul)