Please use this identifier to cite or link to this item: https://hdl.handle.net/10316/106541
Title: Combination of searches for Higgs boson pairs in pp collisions at s=13TeV with the ATLAS detector
Authors: Fiolhais, M. C. N. 
Veloso, F. 
Wolters, H. 
ATLAS Collaboration
Issue Date: 2020
Publisher: Elsevier
metadata.degois.publication.title: Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
metadata.degois.publication.volume: 800
Abstract: This letter presents a combination of searches for Higgs boson pair production using up to 36.1fb−1of proton–proton collision data at a centre-of-mass energy √s=13TeVrecorded 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¯ bγγand W+W−γγfinal 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 self-coupling 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.
URI: https://hdl.handle.net/10316/106541
DOI: 10.1016/j.physletb.2019.135103
Rights: openAccess
Appears in Collections:FCTUC Física - Artigos em Revistas Internacionais

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