Search for Higgs boson pair production in the WW(*)WW(*) decay channel using ATLAS data recorded at √s = 13 TeV
- Author(s): Aaboud, M
- Aad, G
- Abbott, B
- Abdinov, O
- Abeloos, B
- Abhayasinghe, DK
- Abidi, SH
- AbouZeid, OS
- Abraham, NL
- Abramowicz, H
- Abreu, H
- Abulaiti, Y
- Acharya, BS
- Adachi, S
- Adam, L
- Adamczyk, L
- Adelman, J
- Adersberger, M
- Adiguzel, A
- Adye, T
- Affolder, AA
- Afik, Y
- Agheorghiesei, C
- Aguilar-Saavedra, JA
- Ahmadov, F
- Aielli, G
- Akatsuka, S
- Åkesson, TPA
- Akilli, E
- Akimov, AV
- Alberghi, GL
- Albert, J
- Albicocco, P
- Alconada Verzini, MJ
- Alderweireldt, S
- Aleksa, M
- Aleksandrov, IN
- Alexa, C
- Alexopoulos, T
- Alhroob, M
- Ali, B
- Alimonti, G
- Alison, J
- Alkire, SP
- Allaire, C
- Allbrooke, BMM
- Allen, BW
- Allport, PP
- Aloisio, A
- Alonso, A
- Alonso, F
- Alpigiani, C
- Alshehri, AA
- Alstaty, MI
- Alvarez Gonzalez, B
- Álvarez Piqueras, D
- Alviggi, MG
- Amadio, BT
- Amaral Coutinho, Y
- Ambler, A
- Ambroz, L
- Amelung, C
- Amidei, D
- Amor Dos Santos, SP
- Amoroso, S
- Amrouche, CS
- Anastopoulos, C
- Ancu, LS
- Andari, N
- Andeen, T
- Anders, CF
- Anders, JK
- Anderson, KJ
- Andreazza, A
- Andrei, V
- Anelli, CR
- Angelidakis, S
- Angelozzi, I
- Angerami, A
- Anisenkov, AV
- Annovi, A
- Antel, C
- Anthony, MT
- Antonelli, M
- Antrim, DJA
- Anulli, F
- Aoki, M
- Aparisi Pozo, JA
- Aperio Bella, L
- Arabidze, G
- Araque, JP
- Araujo Ferraz, V
- Araujo Pereira, R
- Arce, ATH
- Ardell, RE
- Arduh, FA
- Arguin, JF
- Argyropoulos, S
- Armbruster, AJ
- Armitage, LJ
- et al.
Abstract
© 2019, The Author(s). A search for a pair of neutral, scalar bosons with each decaying into two W bosons is presented using 36.1 fb−1 of proton-proton collision data at a centre-of-mass energy of 13 TeV recorded with the ATLAS detector at the Large Hadron Collider. This search uses three production models: non-resonant and resonant Higgs boson pair production and resonant production of a pair of heavy scalar particles. Three final states, classified by the number of leptons, are analysed: two same-sign leptons, three leptons, and four leptons. No significant excess over the expected Standard Model backgrounds is observed. An observed (expected) 95% confidence-level upper limit of 160 (120) times the Standard Model prediction of non-resonant Higgs boson pair production cross-section is set from a combined analysis of the three final states. Upper limits are set on the production cross-section times branching ratio of a heavy scalar X decaying into a Higgs boson pair in the mass range of 260 GeV ≤ mX ≤ 500 GeV and the observed (expected) limits range from 9.3 (10) pb to 2.8 (2.6) pb. Upper limits are set on the production cross-section times branching ratio of a heavy scalar X decaying into a pair of heavy scalars S for mass ranges of 280 GeV ≤ mX ≤ 340 GeV and 135 GeV ≤ mS ≤ 165 GeV and the observed (expected) limits range from 2.5 (2.5) pb to 0.16 (0.17) pb.