anyH3: precise predictions for the trilinear Higgs coupling in the Standard Model and beyond
Henning Bahl, Johannes Braathen, Martin Gabelmann, G. Weiglein
Abstract
Abstract The trilinear Higgs coupling $$\lambda _{hhh}$$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:msub> <mml:mi>λ</mml:mi> <mml:mrow> <mml:mi>hhh</mml:mi> </mml:mrow> </mml:msub> </mml:math> of the detected Higgs boson is an important probe for physics beyond the Standard Model. Correspondingly, improving the precision of the theoretical predictions for this coupling as well as the experimental constraints on it are among the main goals of particle physics in the near future. In this article, we present the public code , which provides precise theoretical predictions for $$\lambda _{hhh}.$$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mrow> <mml:msub> <mml:mi>λ</mml:mi> <mml:mrow> <mml:mi>hhh</mml:mi> </mml:mrow> </mml:msub> <mml:mo>.</mml:mo> </mml:mrow> </mml:math> The program can easily be used for any renormalisable model, where for the input the format is adopted. It allows including corrections up to the full one-loop level with arbitrary values of the external squared momenta and features a semi-automatic and highly flexible renormalisation procedure. The code is validated against known results in the literature. Moreover, we present new results for $$\lambda _{hhh}$$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:msub> <mml:mi>λ</mml:mi> <mml:mrow> <mml:mi>hhh</mml:mi> </mml:mrow> </mml:msub> </mml:math> in models which so far have not been investigated in the literature.