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
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.