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Simulation Studies for Charm Baryon Dipole Moment Experiment at LHC
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Orientador(es)
Resumo(s)
The observable asymmetry between matter and antimatter in the Universe has remained one of the most significant challenges in modern particle physics. Charge-parity violation, consisting of the symmetry breaking that transforms a particle into its antiparticle, has been proposed to explain the dominance of baryonic matter over anti-matter. Nevertheless, the Standard Model framework predictions are underwhelming in comparison with current experimental observations thus suggesting the need for beyond the SM physics to comprehend the matter discrepancy phenomenon. Measurements of electric dipole moments are promising probes of the asymmetry problem. A non-negligible EDM of fundamental particles would point to CP violation by the CP-time theorem, whereas the MDM property gives insight into hadronic structure and serves as tests for the CPT theorem when comparing particle and anti-particle MDM. A recent experimental proposal at the Large Hadron Collider has been developed to measure dipole moments of short-lived heavy baryons using an innovative technique that explores spin precession and channeling in bent crystals to enhance measurement sensitivity. This thesis explores the feasibility of the proposed experiment by employing parametric simulations to produce the pK−π + invariant mass spectrum from Λ + c decays, and generating mesonic combinatorial background using D+ and D+ s decays. The mass resolution of the three particles is extracted as a function of detector geometry, with the end goal of optimizing the isolation of the signal peak for subsequent dipole moment measurements. Efficiency studies are performed for invariant mass cuts, along with a particle identification analysis to suppress the effects of misidentified particles emulating signal events. It is determined that a longer lever arm for the tracking system yields sharper mass resolutions, hence improving background discrimination. Additionally, it is revealed that a 2.5σΛ + c window around the peak of the pK−π + spectrum isolates the signal distribution for larger distances between first and last tracker.
Descrição
Tese de Mestrado, Física e Astrofísica, 2025, Universidade de Lisboa, Faculdade de Ciências
Palavras-chave
Standard Model CP Violation Dipole Moments Charm Baryon Bent Crystal Experiment