Precise measurement of $Γ(H \longrightarrow γγ)$ at a PLC and theoretical consequences

Details Precise measurement of $Γ(H \longrightarrow γγ)$ at a PLC and theoretical consequences Precise measurement of $Γ(H \longrightarrow γγ)$ at a PLC and theoretical consequences

1999-07-23

arxiv.org/abs/hep-ph/9907473v1

J.Phys.G25:2243-2252,1999

Physics

High Energy Physics

High Energy Physics - Phenomenology

14 pages, 7 figures, contributed to LP99 at Stanford, CA

Scientific paper

10.1088/0954-3899/25/11/306

With the LEP II Higgs search approaching exclusion limits on low values of $\tan \beta \sim 2$ 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 $\tan \beta$ 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 $\gamma \gamma$ collider (PLC) in the MSSM mass range below 130 GeV. The MSSM and SM predictions for $\Gamma (H \longrightarrow \gamma \gamma)$ can differ by up to 10 % even in the decoupling limit of large $m_A$. We summarize recent progress in both the theoretical understanding of the background process $\gamma \gamma \longrightarrow q \bar{q}$, $q=\{b,c\}$, and in the expected detector performance allow for a high accuracy of the lightest MSSM or SM Higgs boson decay into a $b \bar{b}$ 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 $\tan \beta <2$.

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