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Hidden particle production at the ILC

Keisuke Fujii1,*, Hitoshi Hano2,†, Hideo Itoh1,‡, Nobuchika Okada1,§, and Tamaki Yoshioka2,∥

  • 1High Energy Accelerator Research Organization (KEK), 1-1 Oho, Tsukuba 305-0801, Japan
  • 2University of Tokyo, International Center for Elementary Particle Physics (ICEPP) 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-0033, Japan

  • *keisuke.fujii@kek.jp
  • †hano@icepp.s.u-tokyo.ac.jp
  • ‡hideo@post.kek.jp
  • §okadan@post.kek.jp
  • ∥tyosioka@icepp.s.u-tokyo.ac.jp
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Phys. Rev. D 78, 015008 – Published 14 July, 2008

DOI: https://doi.org/10.1103/PhysRevD.78.015008

Abstract

In a class of new physics models, the new physics sector is completely or partly hidden, namely, a singlet under the standard model (SM) gauge group. Hidden fields included in such new physics models communicate with the standard model sector through higher-dimensional operators. If a cutoff lies in the TeV range, such hidden fields can be produced at future colliders. We consider a scalar field as an example of the hidden fields. Collider phenomenology on this hidden scalar is similar to that of the SM Higgs boson, but there are several features quite different from those of the Higgs boson. We investigate productions of the hidden scalar at the International Linear Collider (ILC) and study the feasibility of its measurements, in particular, how well the ILC distinguishes the scalar from the Higgs boson, through realistic Monte Carlo simulations.

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Phys. Rev. D 78, 015008– Published 14 July, 2008
  • Received 27 February 2008

© 2008 American Physical Society

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