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Home > Articles & Preprints > CERN Notes > CLIC Detector and Physics Study Notes > Double Higgs boson production and Higgs self-coupling extraction at CLIC > Plots
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Double Higgs boson production and Higgs self-coupling extraction at CLIC - Roloff, Philipp Gerhard et al - arXiv:1901.05897v1: CLICdp-Note-2018-006v2: CLICdp-Pub-2019-007CLICdp-Note-2018-006
Cross section as a function of centre-of-mass energy for $\epem\to \Zhh$ and $\epem\to \HHvv$ production for a Higgs boson mass of $m_{\mathrm{H}}$~=~126 GeV. The values shown correspond to unpolarised beams including initial state radiation but not including the effect of beamstrahlung~\cite{Abramowicz:2210491}.
Main Feynman diagrams contributing to double Higgs boson production via W-boson fusion. Diagram a) contains the trilinear Higgs self-coupling, b) grows with the quartic coupling \gHHWW, while c) and d) are sensitive to the Higgs coupling to W bosons.
Invariant mass of the Higgs pairs in \epem $\to$ \HHvv production with different values of \kappaHHH and \kappaHHWW at truth level. (a) Comparing samples with $\kappaHHH1$. The sample with $\kappaHHH=2.2$ has roughly the same total cross section as the SM case. (b) Comparing samples with one of the couplings fixed to the SM value.
Cross section dependence of the trilinear Higgs self-coupling for the process (a) \HHvv production at 3\,TeV and (b) \ZHH production at 1.4\,TeV. Beamstrahlung and initial state radiation are included. The SM case is at $\frac{\gHHH}{\gHHHSM} =1$. The ambiguity of the cross section value in the case of \HHvv production is illustrated in (a). No such ambiguity exists in the \ZHH production process (b).
Cross section dependence of the trilinear Higgs self-coupling for the processes \HHvv production at 1.4 and 3\,TeV and \ZHH production at 1.4\,TeV for unpolarised beams. Beamstrahlung and initial state radiation are included. The SM case is at $\frac{\gHHH}{\gHHHSM} =1$. The ambiguity of the cross section value in the case of \HHvv production is illustrated for 3\,TeV. No such ambiguity exists in the \ZHH production process.
Cross section dependence of the trilinear Higgs self-coupling for the process (a) \HHvv production at 3\,TeV and (b) \ZHH production at 1.4\,TeV. Beamstrahlung and initial state radiation are included. The SM case is at $\frac{\gHHH}{\gHHHSM} =1$. The ambiguity of the cross section value in the case of \HHvv production is illustrated in (a). No such ambiguity exists in the \ZHH production process (b).
Distribution of the sum of the $b$-tag values for the inclusive \HHvv and the \HHvv $\to$ $\bbbb\nunubar$ channel, both scaled by a factor $5000$ for better visibility, and for the background processes. No selection is applied.
Distribution of the sum of the $b$-tag values for (a) the \HHvv $\to$ \bbbb channel only and (b) for the background processes. No selection is applied.
BDT response distribution of (a) all SM contributions stacked and (b) a selection of signal samples with modified \gHHH in the loose BDT selection at 3\,TeV CLIC. The Higgs-gauge boson coupling \gHHWW is kept at its SM value.
BDT response distribution of (a) all SM contributions stacked and (b) a selection of signal samples with modified \gHHH in the loose BDT selection at 3\,TeV CLIC. The Higgs-gauge boson coupling \gHHWW is kept at its SM value.
Distribution of the sum of the $b$-tag values for (a) the \HHvv $\to$ \bbbb channel only and (b) for the background processes. No selection is applied.
Invariant mass of the Higgs pairs in \epem $\to$ \HHvv production with different values of \kappaHHH and \kappaHHWW at truth level. (a) Comparing samples with $\kappaHHH1$. The sample with $\kappaHHH=2.2$ has roughly the same total cross section as the SM case. (b) Comparing samples with one of the couplings fixed to the SM value.
Invariant mass of the Higgs boson pair for the SM contributions in the loose BDT selection at 3\,TeV CLIC.
Invariant mass of the Higgs pairs for the signal contributions with different values of \kappaHHH and \kappaHHWW in the loose BDT region. (a) Comparing samples with one of the couplings fixed to the SM value. (b) Comparing samples with $\kappaHHH1$. The sample with $\kappaHHH=2.2$ has roughly the same total cross section as the SM case.
$\Delta \chi^2$ curves based on only rate information in the tight BDT selection of the \HHvv analysis at 3\,TeV (a) without and (b) including a combination with the measurement of the \ZHH production cross section at 1.4\,TeV.
$\Delta \chi^2$ curves based on differential distributions (a) without and (b) including a combination with the measurement of the \ZHH production cross section at 1.4\,TeV.
Invariant mass of the Higgs pairs for the signal contributions with different values of \kappaHHH and \kappaHHWW in the loose BDT region. (a) Comparing samples with one of the couplings fixed to the SM value. (b) Comparing samples with $\kappaHHH1$. The sample with $\kappaHHH=2.2$ has roughly the same total cross section as the SM case.
Kinematic bins used for the \HHvv sensitivity at 3 TeV: the invariant mass of the Higgs boson pair M(HH) in bins of the BDT score.
$\Delta \chi^2$ curves based on rate-only and differential information in the \HHvv measurement at 3\,TeV without and with a combination with the measurement of the \ZHH production cross section at 1.4\,TeV. As a comparison, the $\Delta \chi^2$ for the case of the second energy stage only is shown.
Confidence contours at 68\,\% and 95\,\%\,C.L. for the simultaneous fit of \kappaHHH and \kappaHHWW based on differential measurement in \HHvv production at 3\,TeV CLIC.
$\Delta \chi^2$ curves based on differential distributions (a) without and (b) including a combination with the measurement of the \ZHH production cross section at 1.4\,TeV.
$\Delta \chi^2$ curves based on rate-only and differential information in the \HHvv measurement at 3\,TeV without and with a combination with the measurement of the \ZHH production cross section at 1.4\,TeV.
Confidence contours at 68\,\% and 95\,\%\,C.L. for the simultaneous fit of \kappaHHH and \kappaHHWW based on differential measurement in \HHvv production at 3\,TeV CLIC and the cross-section measurement of \ZHH at 1.4\,TeV.
$\Delta \chi^2$ curves based on only rate information in the tight BDT selection of the \HHvv analysis at 3\,TeV (a) without and (b) including a combination with the measurement of the \ZHH production cross section at 1.4\,TeV.

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