What’s in the loop? The anatomy of double Higgs production

Abstract

Determination of Higgs self-interactions through the double Higgs production from gluon fusion is a major goal of current and future collider experiments. We point out this channel could help disentangle and resolve the nature of ultraviolet contributions to Higgs couplings to two gluons.Analytic properties of the double Higgs amplitudes near kinematic threshold are used to study features resulting from scalar and fermionic loop particles mediating the interaction. Focusing on the hh invariant mass spectrum, we consider the effect from anomalous top and bottom Yukawa couplings, as well as from scalar and fermionic loop particles. In particular, the spectrum at high hh invariant mass is sensitive to the spin of the particles in the loop.

Interference effects and the use of Higgs boson pair production to study the Higgs trilinear self-coupling

“…However, the conclusion is clear; without the distribution functions to emphasize the low energy parts of the cross sections, cos(α I ) is no longer universal. More specifically, this Table shows that the behavior of the partonic cross section near threshold ( √ŝ ∼ 300 − 500 GeV) deduced in [19,20] using unitarity cutting rules is the basically the only region probed by the full cross section σ(pp → HH + X) no matter what the center of mass energy happens to be.…”

“…For all cases the approximate constancy of cos(α I ) is a result of the near threshold behavior of the amplitudes and the large values of the parton luminosity in the threshold region. For the dominant subprocess, gg → HH, the almost maximal destructive interference between the triangle and box amplitudes (cos(α I ) = −0.90) obtained using unitarity cutting [19,20] tends to make the total cross section small and thus difficult to measure.…”

Self-coupling of the Higgs boson in the processespp→ZHHH+Xandpp→WHHDicus1, Kao2, Repko3 2016Phys. Rev. D12080View full textAdd to dashboardCite

“…For example, the subprocess gg → HH obviously depends on the three Higgs coupling as does gg → ttHH [6][7][8][9][10][11][12][13][14][15][16][17][18][19][20][21][22]. Processes with three Higgs bosons in the final state are necessary to determine κ 4 .…”

Double Higgs boson production and decay in Randall-Sundrum model at hadron colliders

“…Up to now, the double Higgs boson production has been widely phenomenologically investigated at both pp hadron colliders and e + e − linear colliders [4][5][6]. The double Higgs boson production at the LHC in the SM including the next-to-leading order (NLO) QCD corrections has been calculated in Ref.…”