Combination of searches for Higgs boson pairs in pp collisions at √s=13 TeV with the ATLAS detector
Aad, Georges; Abbott, Brad; Abbott, Dale C.; Abed Abud, Adam; Abeling, Kira; Abhayasinghe, Deshan Kavishka; Abidi, Syed Haider; AbouZeid, Hass; Abraham, Nadine L.; Abramowicz, Halina; Bjørke, Kristian; Bugge, Magnar Kopangen; Cameron, David Gordon; Catmore, James Richard; Garonne, Vincent; Gramstad, Eirik; Hellesund, Simen; Morisbak, Vanja; Oppen, Henrik; Ould-Saada, Farid; Pedersen, Maiken; Read, Alexander Lincoln; Rye, Eli Bæverfjord; Røhne, Ole Myren; Sandaker, Heidi; Vadla, Knut Oddvar Høie; Buanes, Trygve; Djuvsland, Julia Isabell; Eigen, Gerald; Fomin, Nikolai; Lee, Graham Richard; Lipniacka, Anna; Martin dit Latour, Bertrand; Mæland, Steffen; Stugu, Bjarne; Træet, Are Sivertsen; Abreu, Henso; Abulaiti, Yiming; Acharya, Bobby S.; Achkar, Baida; Adachi, Shunsuke; Adam, Lennart; Adam-Bourdarios, Claire; Adamczyk, Leszek; Adamek, Lukas; Adelman, Jareed; Adersberger, Michael; Adigüzel, Aytül; Adorni, Sofia; Adye, Tim; ATLAS, Collaboration
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Date
2020-01-10Metadata
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Abstract
This letter presents a combination of searches for Higgs boson pair production using up to 36.1 fb−1 of
proton–proton collision data at a centre-of-mass energy √s = 13 TeV recorded with the ATLAS detector at
the LHC. The combination is performed using six analyses searching for Higgs boson pairs decaying into
the b¯bb¯b, b¯bW +W −, b¯bτ +τ −, W +W −W +W −, b¯bγγ and W +W −γγ final states. Results are presented
for non-resonant and resonant Higgs boson pair production modes. No statistically significant excess in
data above the Standard Model predictions is found. The combined observed (expected) limit at 95%
confidence level on the non-resonant Higgs boson pair production cross-section is 6.9 (10) times the
predicted Standard Model cross-section. Limits are also set on the ratio (κλ) of the Higgs boson selfcoupling to its Standard Model value. This ratio is constrained at 95% confidence level in observation
(expectation) to −5.0 < κλ < 12.0 (−5.8 < κλ < 12.0). In addition, limits are set on the production
of narrow scalar resonances and spin-2 Kaluza–Klein Randall–Sundrum gravitons. Exclusion regions are
also provided in the parameter space of the habemus Minimal Supersymmetric Standard Model and the
Electroweak Singlet Model