Physics Case for the 250 GeV Stage of the International Linear Collider
Keisuke Fujii, Christophe Grojean, Michael E. Peskin, Tim Barklow,, Yuanning Gao, Shinya Kanemura, Hyungdo Kim, Jenny List, Mihoko Nojiri, Maxim, Perelstein, Roman Poeschl, Juergen Reuter, Frank Simon, Tomohiko Tanabe,, James D. Wells, Jaehoon Yu, Mikael Berggren
TL;DR
This paper reviews the physics potential of the proposed 250 GeV stage of the International Linear Collider, focusing on precision Higgs measurements, exotic decay searches, and improved electroweak process sensitivities.
Contribution
It provides a comprehensive overview of the physics goals and expected measurement precisions for the initial 250 GeV stage of the ILC, based on recent simulation studies.
Findings
Projected Higgs coupling measurement precisions
Sensitivity to exotic Higgs decays
Enhanced measurements of W+W- and 2-fermion processes
Abstract
The International Linear Collider is now proposed with a staged machine design, with the first stage at 250 GeV with a luminosity goal of 2 ab-1. In this paper, we review the physics expectations for this machine. These include precision measurements of Higgs boson couplings, searches for exotic Higgs decays, other searches for particles that decay with zero or small visible energy, and measurements of e+e- annihilation to W+W- and 2-fermion states with improved sensitivity. A summary table gives projections for the achievable levels of precision based on the latest full simulation studies.
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