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Item type:Publication, On the Sensitivity Reach of LQ Production with Preferential Couplings to Third Generation Fermions at the LHC(Institute for Ionics, 2023-11-01)Leptoquarks (LQ s) are hypothetical particles that appear in various extensions of the Standard Model (SM), that can explain observed differences between SM theory predictions and experimental results. The production of these particles has been widely studied at various experiments, most recently at the Large Hadron Collider (LHC), and stringent bounds have been placed on their masses and couplings, assuming the simplest beyond-SM (BSM) hypotheses. However, the limits are significantly weaker for LQ models with family non-universal couplings containing enhanced couplings to third-generation fermions. We present a new study on the production of a LQ at the LHC, with preferential couplings to third-generation fermions, considering proton-proton collisions at s=13TeV and s=13.6TeV . Such a hypothesis is well motivated theoretically and it can explain the recent anomalies in the precision measurements of B -meson decay rates, specifically the RD(∗) ratios. Under a simplified model where the LQ masses and couplings are free parameters, we focus on cases where the LQ decays to a τ lepton and a b quark, and study how the results are affected by different assumptions about chiral currents and interference effects with other BSM processes with the same final states, such as diagrams with a heavy vector boson, Z ′ . The analysis is performed using machine learning techniques, resulting in an increased discovery reach at the LHC, allowing us to probe new physics phase space which addresses the B -meson anomalies, for LQ masses up to 5.00TeV , for the high luminosity LHC scenario. - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Can SUSY Relax Lepton Number Violation Constraints Coming from Loop Corrections to Light Neutrino Masses on the Low-Scale Seesaw Mechanism?(American Physical Society, 2023-06-01)Heavy neutrinos from the type-I seesaw model can have a large mixing with active states, motivating their search at collider experiments. However, loop corrections to light neutrino masses constrain the heavy neutrinos to appear in pseudo-Dirac pairs, leading to a potential suppression of lepton number violating parameters. In this work we perform a detailed review of a proposal to relax constraints on lepton number violation by adding supersymmetry (SUSY). We define the conditions necessary to maximize the SUSY screening effect, with the objective of allowing a larger mass splitting between low-scale heavy neutrino masses. We find that the sole addition of SUSY does not guarantee a screening, and that favorable cases have some degree of fine-tuning.