2023/12/15 by Emanuele Bagnaschi, Gennaro Corcella, Bagnaschi, Emanuele +5
Biochemistry, Genetics and Molecular Biology · Computer Science · Physics and Astronomy · #Computational Physics and Python Applications #FOS: Physical sciences #Fractal and DNA sequence analysis #High Energy Physics - Experiment (hep-ex) #High Energy Physics - Phenomenology (hep-ph) #Particle physics theoretical and experimental studies
paper · pdf · doi:10.48550/arxiv.2312.09794
openalex publication_date 2023/12/15 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
We discuss the possibility that light new physics in the top quark sample at the LHC can be found by investigating with greater care well known kinematic distributions, such as the invariant mass mbℓ of the b-jet and the charged lepton in fully leptonic tt events. We demonstrate that new physics can be probed in the rising part of the already measured mbℓ distribution. To this end we analyze a concrete supersymmetric scenario with light right-handed stop quark, chargino and neutralino. The corresponding spectra are characterized by small mass differences, which make them not yet excluded by current LHC searches and give rise to a specific end-point in the shape of the mbℓ distribution. We argue that this sharp feature is general for models of light new physics that have so far escaped the LHC searches and can offer a precious handle for the implementation of robust searches that exploit, rather than suffer from, soft bottom quarks and leptons. Recasting public data on searches for new physics, we identify candidate models that are not yet excluded. For these models we study the mbℓ distribution and derive the expected signal yields, finding that there is untapped potential for discovery of new physics using the mbℓ distribution.