Eur. Phys. J. C (2006) 46: 527-531
https://doi.org/10.1140/epjc/s2006-02534-6

Theoretical Physics

Model-independent determination of the top Yukawa coupling from LHC and ILC

¹ Physikalisches Institut, Universität Freiburg, Hermann-Herder-Str. 3, 79104, Freiburg, Germany
² Physikalisches Institut, Universität Bonn, Nussallee 12, 53112, Bonn, Germany

^* e-mail: desch@physik.uni-freiburg.de

Received: 3 November 2005
Published online: 30 March 2006

Abstract

We show how a measurement of the process pp→tt̄H⁰+X at the Large Hadron Collider (LHC) and a measurement of the Higgs boson branching ratios BR(H⁰→bb̄) and BR(H⁰→W⁺W^-) at a future linear electron positron collider (ILC) can be combined to extract a value of the top quark Yukawa coupling in a model-independent way. We find that for masses with 120 GeV/c²<m_H<200 GeV/c² a measurement precision of 15% including systematic uncertainties can be achieved for integrated luminosities of 300 fb^-1 at the LHC and 500 fb^-1 at the ILC at a centre-of-mass energy of 350 GeV.