2007/06/10 by Svjetlana Fajfer, Nejc Košnik, Nejc Kosnik +2 · 1 citation
Physics and Astronomy · #High-Energy Particle Collisions Research #Particle physics theoretical and experimental studies #Quantum Chromodynamics and Particle Interactions #hep-ph
paper · pdf · doi:10.1103/physrevd.76.074010
published as Phys.Rev.D76:074010,2007 · 15 pages, 4 figures
arxiv created 2007/06/10 · openalex publication_date 2007/10/12 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/29
Motivated by recent experimental results on charm physics, we investigate implications of the updated constraints of new physics in rare charm meson decays. We first reconsider effects of the minimal supersymmetric standard model (MSSM) in c\ensuremath→u\ensuremathγ constrained by the recent experimental evidence on \ensuremathΔmD and find that, due to the dominance of long-distance physics, D\ensuremath→V\ensuremathγ decay rates cannot be modified by MSSM contributions. Then we consider effects of the extra heavy up vectorlike quark models on the decay spectrum of D+\ensuremath→\ensuremathπ+\ensuremathℓ+\ensuremathℓ^\ensuremath- and Ds+\ensuremath→K+\ensuremathℓ+\ensuremathℓ^\ensuremath- decays. We find a possibility for the tiny increase of the differential decay rate in the region of large dilepton mass. The R-parity violating supersymmetric model can also modify short distance dynamics in c\ensuremath→u\ensuremathℓ+\ensuremathℓ^\ensuremath- decays. We constrain relevant parameters using the current upper bound on the D+\ensuremath→\ensuremathπ+\ensuremathℓ+\ensuremathℓ^\ensuremath- decay rate and investigate the impact of that constraint on the Ds+\ensuremath→K+\ensuremathℓ+\ensuremathℓ^\ensuremath- differential decay dilepton distribution. Present bounds still allow a small modification of the standard model differential decay rate distribution.