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Constraints on spin-0 dark matter mediators and invisible Higgs decays using ATLAS 13 TeV pp collision data with two top quarks and missing transverse momentum in the final state

Publicated to:European Physical Journal c. 83 (6): 503- - 2023-01-01 83(6), DOI: 10.1140/epjc/s10052-023-11477-z

Authors: Aad G; Abbott B; Abbott DC; Abeling K; Abidi SH; Aboulhorma A; Abramowicz H; Abreu H; Abulaiti Y; Hoffman ACA; Acharya BS; Achkar B; Adam L; Bourdarios CA; Adamczyk L; Adamek L; Addepalli SV; Adelman J; Adiguzel A; Adorni S; Adye T; Affolder AA; Afik Y; Agaras MN; Agarwala J; Aggarwal A; Agheorghiesei C; Aguilar-Saavedra JA; Ahmad A; Ahmadov F; Ahmed WS; Ai X; Aielli G; Aizenberg I; Akbiyik M; Åkesson TPA; Akimov AV; Khoury KA; Alberghi GL; Albert J; Albicocco P; Verzini MJA; Alderweireldt S; Aleksa M; Aleksandrov IN; Alexa C; Alexopoulos T; Alfonsi A; Alfonsi F; Alhroob M; Ali B; Ali S; Aliev M; Alimonti G; Allaire C; Allbrooke BMM; Allport PP; Aloisio A; Alonso F; Alpigiani C; Camelia EA; Estevez MA; Alviggi MG; Coutinho YA; Ambler A; Amelung C; Ames CG; Amidei D; Santos SPAD; Amoroso S; Amos KR; Amrouche CS; Ananiev V; Anastopoulos C; Andari N; Andeen T; Anders JK; Andrean SY; Andreazza A; Angelidakis S; Angerami A; Anisenkov AV; Annovi A; Antel C; Anthony MT; Antipov E; Antonelli M; Antrim DJA; Anulli F; Aoki M; Pozo JAA; Aparo MA; Bella LA; Appelt C; Aranzabal N; Ferraz VA; Arcangeletti C; Arce ATH; Arena E; Arguin J-F; Argyropoulos S; Arling J-H; Armbruster AJ; Arnaez O; Arnold H; Tame ZPA; Artoni G; Asada H; Asai K; Asai S; Asbah NA; Asimakopoulou EM; Assahsah J; Assamagan K; Astalos R; Atkin RJ; Atkinson M; Atlay NB; Atmani H; Atmasiddha PA; Augsten K; Auricchio S; Auriol AD; Austrup VA; Avner G; Avolio G; Axiotis K; Ayoub MK; Azuelos G; Babal D; Bachacou H; Bachas K; Bachiu A; Backman F; Badea A; Bagnaia P; Bahmani M; Bailey AJ; Bailey VR; Baines JT; Bakalis C; Baker OK; Bakker PJ; Bakos E; Gupta DB; Balaji S; Balasubramanian R; Baldin EM; Balek P; Ballabene E; Balli F; Baltes LM; Balunas WK; Balz J; Banas E; Bandieramonte M; Bandyopadhyay A; Bansal S; Barak L; Barberio EL; Barberis D; Barbero M; Barbour G; Barends KN; Barillari T; Barisits M-S; Barkeloo J; Barklow T; Barnett RM; Baron P; Moreno DAB; Baroncelli A; Barone G; Barr AJ; Navarro LB; Barreiro F; da Costa JBG; 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Billoud TRV; Bindi M; Bingul A; Bini C; Biondi S; Biondini A; Birch-sykes CJ; Bird GA; Birman M; Bisanz T; Biswas D; Bitadze A; Bjørke K; Bloch I; Blocker C; Blue A; Blumenschein U; Blumenthal J; Bobbink GJ; Bobrovnikov VS; Boehler M; Bogavac D; Bogdanchikov AG; Bohm C; Boisvert V; Bokan P; Bold T; Bomben M; Bona M; Boonekamp M; Booth CD; Borbély AG; Borecka-Bielska HM; Borgna LS; Borissov G; Bortoletto D; Boscherini D; Bosman M; Sola JDB; Bouaouda K; Boudreau J; Bouhova-Thacker EV; Boumediene D; Bouquet R; Boveia A; Boyd J; Boye D; Boyko IR; Bozek K; Bracinik J; Brahimi N; Brandt G; Brandt O; Braren F; Brau B; Brau JE; Madden WDB; Brendlinger K; Brener R; Brenner L; Brenner R; Bressler S; Brickwedde B; Britton D; Britzger D; Brock I; Brooijmans G; Brooks WK; Brost E; de Renstrom PAB; Brüers B; Bruncko D; Bruni A; Bruni G; Bruschi M; Bruscino N; Bryngemark L; Buanes T; Buat Q; Buchholz P; Buckley AG; Budagov IA; Bugge MK; Bulekov O; Bullard BA; Burdin S; Burgard CD; Burger AM; Burghgrave B; 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Domenico AD; Donato CD; Girolamo AD; Gregorio GD; Luca AD; Micco BD; Nardo RD; Diaconu C; Dias FA; Do Vale TD; Diaz MA; Capriles FGD; Didenko M; Diehl EB; Diehl L; Cornell SD; Pardos CD; Dimitriadi C; Dimitrievska A; Ding W; Dingfelder J; Dinu I-M; Dittmeier SJ; Dittus F; Djama F; Djobava T; Djuvsland JI; Dodsworth D; Doglioni C; Dolejsi J; Dolezal Z; Donadelli M; Dong B; Donini J; D’Onofrio A; D’Onofrio M; Dopke J; Doria A; Dova MT; Doyle AT; Draguet MA; Drechsler E; Dreyer E; Drivas-koulouris I; Drobac AS; Du D; Pree TA; Dubinin F; Dubovsky M; Duchovni E; Duckeck G; Ducu OA; Duda D; Dudarev A; D’uffizi M; Duflot L; Dührssen M; Dülsen C; Dumitriu AE; Dunford M; Dungs S; Dunne K; Duperrin A; Yildiz HD; Düren M; Durglishvili A; Dwyer BL; Dyckes GI; Dyndal M; Dysch S; Dziedzic BS; Earnshaw ZO; Eckerova B; Eggleston MG; De Souza EEP; Ehrke LF; Eigen G; Einsweiler K; Ekelof T; Ekman PA; El Ghazali Y; El Jarrari H; El Moussaouy A; Ellajosyula V; Ellert M; Ellinghaus F; Elliot AA; Ellis N; Elmsheuser J; Elsing M; Emeliyanov D; Emerman A; Enari Y; Ene I; Epari S; Erdmann J; Ereditato A; Erland PA; Errenst M; Escalier M; Escobar C; Etzion E; Evans G; Evans H; Evans MO; Ezhilov A; Ezzarqtouni S; Fabbri F; Fabbri L; Facini G; Fadeyev V; Fakhrutdinov RM; Falciano S; Falke PJ; Falke S; Faltova J; Fan Y; Fang Y; Fanourakis G; Fanti M; Faraj M; Farbin A; Farilla A; Farooque T; Farrington SM; Fassi F; Fassouliotis D; Giannelli MF; Fawcett WJ; Fayard L; Fedin OL; Fedotov G; Feickert M; Feligioni L; Fell A; Fellers DE; Feng C; Feng M; Fenton MJ; Fenyuk AB; Ferencz L; Ferguson SW; Ferrando J; Ferrari A; Ferrari P; Ferrari R; Ferrere D; Ferretti C; Fiedler F; Filipčič A; Filmer EK; Filthaut F; Fiolhais MCN; Fiorini L; Fischer F; Fisher WC; Fitschen T; Fleck I; Fleischmann P; Flick T; Flores L; Flores M; Castillo LRF; Follega FM; Fomin N; Foo JH; Forland BC; Formica A; Forti AC; Fortin E; Fortman AW; Foti MG; Fountas L; Fournier D; Fox H; Francavilla P; Francescato S; Franchini M; Franchino S; Francis D; 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Jenni P; Jessiman CE; Jézéquel S; Jia J; Jia X; Jia X; Jia Z

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Abstract

This paper presents a statistical combination of searches targeting final states with two top quarks and invisible particles, characterised by the presence of zero, one or two leptons, at least one jet originating from a b-quark and missing transverse momentum. The analyses are searches for phenomena beyond the Standard Model consistent with the direct production of dark matter in pp collisions at the LHC, using 139 fb - 1 of data collected with the ATLAS detector at a centre-of-mass energy of 13 TeV. The results are interpreted in terms of simplified dark matter models with a spin-0 scalar or pseudoscalar mediator particle. In addition, the results are interpreted in terms of upper limits on the Higgs boson invisible branching ratio, where the Higgs boson is produced according to the Standard Model in association with a pair of top quarks. For scalar (pseudoscalar) dark matter models, with all couplings set to unity, the statistical combination extends the mass range excluded by the best of the individual channels by 50 (25) GeV, excluding mediator masses up to 370 GeV. In addition, the statistical combination improves the expected coupling exclusion reach by 14% (24%), assuming a scalar (pseudoscalar) mediator mass of 10 GeV. An upper limit on the Higgs boson invisible branching ratio of 0.38 (0.30-0.09+0.13) is observed (expected) at 95% confidence level. © 2023, The Author(s).

Keywords