1999/07/23 by Michael Melles
Physics and Astronomy · #Atomic and Subatomic Physics Research #Neutrino Physics Research #Particle physics theoretical and experimental studies #hep-ph
paper · pdf · doi:10.1088/0954-3899/25/11/306
published as J.Phys.G25:2243-2252,1999 · 14 pages, 7 figures, contributed to LP99 at Stanford, CA
arxiv created 1999/07/23 · openalex publication_date 1999/10/20 · arxiv updated 2009/11/30 · openalex created_date 2016/06/24 · openalex updated_date 2026/07/28
With the LEP II Higgs search approaching exclusion limits on low values of tan β ∼ 2 it becomes increasingly important to investigate physical quantities sensitive to large masses of a pseudoscalar Higgs mass. This regime is difficult and over a large range of tan β impossible to cover at the LHC proton proton collider. In this paper we focus on the achievable statistical precision of the Higgs decay into two photons at a future γ γ collider (PLC) in the MSSM mass range below 130 GeV. The MSSM and SM predictions for Γ (H \longrightarrow γ γ) can differ by up to 10 % even in the decoupling limit of large mA. We summarize recent progress in both the theoretical understanding of the background process γ γ \longrightarrow q q, q=\b,c\, and in the expected detector performance allow for a high accuracy of the lightest MSSM or SM Higgs boson decay into a b b pair. We find that for optimized but still realistic detector and accelerator assumptions, statistically a 1.4% accuracy is feasible after about four years of collecting data for a Higgs boson mass which excludes tan β <2.