2003/05/07 by Francesca Borzumati, Borzumati, Francesca, C. Greub +4
Physics and Astronomy · #Dark Matter and Cosmic Phenomena #FOS: Physical sciences #High Energy Physics - Phenomenology (hep-ph) #Neutrino Physics Research #Particle physics theoretical and experimental studies #hep-ph
paper · pdf · doi:10.48550/arxiv.hep-ph/0305063
1+10 pages, Based on talks given by Y. Yamada at ``KEK Theory Meeting on Collider Physics'', KEK, Tsukuba, Japan, February 20-22, 2003, and ``The 8th Accelerator and Particle Physics Institute (APPI2003)'', Appi, Iwate, Japan, February 25-28, 2003
arxiv created 2003/05/07 · openalex publication_date 2003/05/07 · arxiv updated 2009/11/30 · openalex created_date 2024/04/11 · openalex updated_date 2026/07/28
The charged-Higgs contributions to the decay B -> Xs gamma are discussed in the minimal supersymmetric standard model at large tan beta. These contributions receive two-loop O(alphas tan beta) corrections by squark-gluino subloops, which are nondecoupling in the limit of heavy superpartners and possibly large. Their leading parts are already known and were evaluated by using an effective two-Higgs-doublet Lagrangian. Subleading corrections coming from higher-dimension operators in the effective Lagrangian were ignored, although this is not, a priori, justified when mH^± is not much smaller than the typical supersymmetric mass MSUSY. Here, we calculate all subleading terms of the O(alphas tan beta) corrections up to O((mt2,mH^±2/MSUSY2)2), as well as all the exact two-loop diagrams with squark-gluino subloops, beyond the effective-Lagrangian approximation. Comments are made on the size of these corrections.