Full simulation study of the top Yukawa coupling at the ILC at  TeV

T. Price; P. Roloff; J. Strube; T. Tanabe

doi:10.1140/epjc/s10052-015-3532-4

EPJ

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2023 Impact factor 4.2

Particles and Fields

Open Access

Eur. Phys. J. C (2015) 75: 309
https://doi.org/10.1140/epjc/s10052-015-3532-4

Special Article - Tools for Experiment and Theory

Full simulation study of the top Yukawa coupling at the ILC at $\sqrt{s}=1$ TeV

T. Price¹, P. Roloff², J. Strube³^,5^* and T. Tanabe⁴

¹ University of Birmingham, Birmingham, UK
² CERN, 1211, Geneva 23, Switzerland
³ Tohoku University, Aramaki, Aoba-ku, Sendai, 980-8578, Japan
⁴ ICEPP, The University of Tokyo, Bunkyo-ku, Tokyo, 113-0033, Japan
⁵ Pacific Northwest National Laboratory, PO Box 999, Richland, WA, 99352, USA

^* e-mail: jan.strube@pnnl.gov

Received: 26 September 2014
Accepted: 19 June 2015
Published online: 4 July 2015

Abstract

We present a study of the expected precision for the measurement of the top Yukawa coupling, $y_{\mathrm {t}}$ , in $\mathrm{e}^{+}\mathrm{e}^{-}$ collisions at a center-of-mass energy of 1 TeV. Independent analyses of $\mathrm{t}\bar{\mathrm{t}}\mathrm{H}$ final states containing at least six hadronic jets are performed, based on detailed simulations of SiD and ILD, the two candidate detector concepts for the ILC. We estimate that a statistical precision on $y_{\mathrm {t}}$ of 4.5 % can be obtained with an integrated luminosity of 1 $\mathrm {ab}^{-1}$ that is split equally between two configurations for the beam polarization $P({{\mathrm{e}}}^{-},{{\mathrm{e}}}^{+})$ , $(-80~\%,+20~\%)$ and $(+80~\%,-20~\%)$ . This estimate improves to $4~\%$ if the 1 $\mathrm {ab}^{-1}$ sample is assumed to be fully in the $P({{\mathrm{e}}}^{-},{{\mathrm{e}}}^{+}) = (-80~\%,+20~\%)$ configuration.