Worked on the SBNSoftware/sbncode repository to enhance the accuracy of physics calculations in particle physics simulations. Focused on correcting the Higgs decay width computation for charged pions by updating the PiPlusPartialWidth logic to properly account for isospin contributions, specifically introducing a factor of two for the charged pion isospin triplet in the StoPipPip decay process. This adjustment ensured that the decay width calculations now align with theoretical expectations and support downstream scientific analyses. The work was implemented in C++ and leveraged expertise in scientific computing and particle physics, addressing a critical bug rather than introducing new features during the period.