Observation of four-top-quark production in the multilepton final state with the ATLAS detector
European Physical Journal C Springer Nature 83:6 (2023) 496
Authors:
G Aad, B Abbott, K Abeling, NJ Abicht, SH Abidi, A Aboulhorma, H Abramowicz, H Abreu, Y Abulaiti, AC Abusleme Hoffman, BS Acharya, C Adam Bourdarios, L Adamczyk, L Adamek, SV Addepalli, MJ Addison, J Adelman, A Adiguzel, T Adye, AA Affolder, Y Afik, MN Agaras, J Agarwala, A Aggarwal, C Agheorghiesei, A Ahmad, F Ahmadov, WS Ahmed, S Ahuja, X Ai, G Aielli, M Ait Tamlihat, B Aitbenchikh, I Aizenberg, M Akbiyik, TPA Åkesson, AV Akimov, D Akiyama, NN Akolkar, K Al Khoury, GL Alberghi, J Albert, P Albicocco, GL Albouy, S Alderweireldt, M Aleksa, IN Aleksandrov, C Alexa, T Alexopoulos, A Alfonsi, F Alfonsi, M Algren, M Alhroob, B Ali, HMJ Ali, S Ali, SW Alibocus, M Aliev, G Alimonti, W Alkakhi, C Allaire, BMM Allbrooke, JF Allen, CA Allendes Flores, PP Allport, A Aloisio, F Alonso, C Alpigiani, M Alvarez Estevez, A Alvarez Fernandez, M Alves Cardoso, MG Alviggi, M Aly, Y Amaral Coutinho, A Ambler, C Amelung, M Amerl, CG Ames, D Amidei, SP Amor Dos Santos, KR Amos, V Ananiev, C Anastopoulos, T Andeen, JK Anders, SY Andrean, A Andreazza, S Angelidakis, A Angerami, AV Anisenkov, A Annovi, C Antel, MT Anthony, E Antipov, M Antonelli, DJA Antrim, F Anulli, M Aoki, T Aoki, JA Aparisi Pozo, MA Aparo, L Aperio Bella, C Appelt, A Apyan, N Aranzabal, C Arcangeletti, ATH Arce, E Arena, J-F Arguin, S Argyropoulos, J-H Arling, O Arnaez, H Arnold, ZP Arrubarrena Tame, G Artoni, H Asada, K Asai, S Asai, NA Asbah, J Assahsah, K Assamagan, R Astalos, S Atashi, RJ Atkin, M Atkinson, NB Atlay, H Atmani, PA Atmasiddha, K Augsten, S Auricchio, AD Auriol, VA Austrup, G Avolio, K Axiotis, G Azuelos, D Babal, H Bachacou, K Bachas, A Bachiu, F Backman, A Badea, P Bagnaia, M Bahmani, AJ Bailey, VR Bailey, JT Baines, L Baines, C Bakalis, OK Baker, E Bakos, D Bakshi Gupta, R Balasubramanian, EM Baldin, P Balek, E Ballabene, F Balli, LM Baltes, WK Balunas, J Balz, E Banas, M Bandieramonte, A Bandyopadhyay, S Bansal, L Barak, M Barakat, EL Barberio, D Barberis, M Barbero, G Barbour, KN Barends, T Barillari, M-S Barisits, T Barklow, P Baron, DA Baron Moreno, A Baroncelli, G Barone, AJ Barr, JD Barr, L Barranco Navarro, F Barreiro, J Barreiro Guimarães da Costa, U Barron, MG Barros Teixeira, S Barsov, F Bartels, R Bartoldus, AE Barton, P Bartos, A Basan, M Baselga, A Bassalat, MJ Basso, CR Basson, RL Bates, S Batlamous, JR Batley, B Batool, M Battaglia, D Battulga, M Bauce, M Bauer, P Bauer, LT Bazzano Hurrell, JB Beacham, T Beau, PH Beauchemin, F Becherer, P Bechtle, HP Beck, K Becker, AJ Beddall, VA Bednyakov, CP Bee, LJ Beemster, TA Beermann, M Begalli, M Begel, A Behera, JK Behr, JF Beirer, F Beisiegel, M Belfkir, G Bella, L Bellagamba, A Bellerive, P Bellos, K Beloborodov, NL Belyaev, D Benchekroun, F Bendebba, Y Benhammou, M Benoit, JR Bensinger, S Bentvelsen, L Beresford, M Beretta, E Bergeaas Kuutmann, N Berger, B Bergmann, J Beringer, G Bernardi, C Bernius, FU Bernlochner, F Bernon, T Berry, P Berta, A Berthold, IA Bertram, S Bethke, A Betti, AJ Bevan, M Bhamjee, S Bhatta, DS Bhattacharya, P Bhattarai, VS Bhopatkar, R Bi, RM Bianchi, G Bianco, O Biebel, R Bielski, M Biglietti, TRV Billoud, M Bindi, A Bingul, C Bini, A Biondini, CJ Birch-sykes, GA Bird, M Birman, M Biros, T Bisanz, E Bisceglie, D Biswas, A Bitadze, K Bjørke, I Bloch, C Blocker, A Blue, U Blumenschein, J Blumenthal, GJ Bobbink, VS Bobrovnikov, M Boehler, B Boehm, D Bogavac, AG Bogdanchikov, C Bohm, V Boisvert, P Bokan, T Bold, M Bomben, M Bona, M Boonekamp, CD Booth, AG Borbély, IS Bordulev, HM Borecka-Bielska, LS Borgna, G Borissov, D Bortoletto, D Boscherini, M Bosman, JD Bossio Sola, K Bouaouda, N Bouchhar, J Boudreau, EV Bouhova-Thacker, D Boumediene, R Bouquet, A Boveia, J Boyd, D Boye, IR Boyko, J Bracinik, N Brahimi, G Brandt, O Brandt, F Braren, B Brau, JE Brau, R Brener, L Brenner, R Brenner, S Bressler, D Britton, D Britzger, I Brock, G Brooijmans, WK Brooks, E Brost, LM Brown, LE Bruce, TL Bruckler, PA Bruckman de Renstrom, B Brüers, D Bruncko, A Bruni, G Bruni, M 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Castro, A Catinaccio, JR Catmore, V Cavaliere, N Cavalli, V Cavasinni, YC Cekmecelioglu, E Celebi, F Celli, MS Centonze, K Cerny, AS Cerqueira, A Cerri, L Cerrito, F Cerutti, B Cervato, A Cervelli, G Cesarini, SA Cetin, Z Chadi, D Chakraborty, M Chala, J Chan, WY Chan, JD Chapman, E Chapon, B Chargeishvili, DG Charlton, TP Charman, M Chatterjee, C Chauhan, S Chekanov, SV Chekulaev, GA Chelkov, A Chen, B Chen, B Chen, H Chen, H Chen, J Chen, J Chen, M Chen, S Chen, SJ Chen, X Chen, X Chen, Y Chen, CL Cheng, HC Cheng, S Cheong, A Cheplakov, E Cheremushkina, E Cherepanova, R Cherkaoui El Moursli, E Cheu, K Cheung, L Chevalier, V Chiarella, G Chiarelli, N Chiedde, G Chiodini, AS Chisholm, A Chitan, M Chitishvili, MV Chizhov, K Choi, AR Chomont, Y Chou, EYS Chow, T Chowdhury, KL Chu, MC Chu, X Chu, J Chudoba, JJ Chwastowski, D Cieri, KM Ciesla, V Cindro, A Ciocio, F Cirotto, ZH Citron, M Citterio, DA Ciubotaru, BM Ciungu, A Clark, PJ Clark, JM Clavijo Columbie, SE Clawson, C Clement, J 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De Sanctis, A De Santo, JB De Vivie De Regie, DV Dedovich, J Degens, AM Deiana, F Del Corso, J Del Peso, F Del Rio, F Deliot, CM Delitzsch, M Della Pietra, D Della Volpe, A Dell’Acqua, L Dell’Asta, M Delmastro, PA Delsart, S Demers, M Demichev, SP Denisov, L D’Eramo, D Derendarz, F Derue, P Dervan, K Desch, C Deutsch, FA Di Bello, A Di Ciaccio, L Di Ciaccio, A Di Domenico, C Di Donato, A Di Girolamo, G Di Gregorio, A Di Luca, B Di Micco, R Di Nardo, C Diaconu, M Diamantopoulou, FA Dias, T Dias Do Vale, MA Diaz, FG Diaz Capriles, M Didenko, EB Diehl, L Diehl, S Díez Cornell, C Diez Pardos, C Dimitriadi, A Dimitrievska, J Dingfelder, I-M Dinu, SJ Dittmeier, F Dittus, F Djama, T Djobava, JI Djuvsland, C Doglioni, J Dolejsi, Z Dolezal, M Donadelli, B Dong, J Donini, A D’Onofrio, M D’Onofrio, J Dopke, A Doria, N Dos Santos Fernandes, MT Dova, AT Doyle, MA Draguet, E Dreyer, I Drivas-koulouris, AS Drobac, M Drozdova, D Du, TA du Pree, F Dubinin, M Dubovsky, E Duchovni, G Duckeck, OA Ducu, D 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S Tsuno, O Tsur, K Tsuri, D Tsybychev, Y Tu, A Tudorache, V Tudorache, AN Tuna, S Turchikhin, I Turk Cakir, R Turra, T Turtuvshin, PM Tuts, S Tzamarias, P Tzanis, E Tzovara, K Uchida, F Ukegawa, PA Ulloa Poblete, EN Umaka, G Unal, M Unal, A Undrus, G Unel, J Urban, P Urquijo, G Usai, R Ushioda, M Usman, Z Uysal, L Vacavant, V Vacek, B Vachon, KOH Vadla, T Vafeiadis, A Vaitkus, C Valderanis, E Valdes Santurio, M Valente, S Valentinetti, A Valero, E Valiente Moreno, A Vallier, JA Valls Ferrer, DR Van Arneman, TR Van Daalen, A Van Der Graaf, P Van Gemmeren, M Van Rijnbach, S Van Stroud, I Van Vulpen, M Vanadia, W Vandelli, M Vandenbroucke, ER Vandewall, D Vannicola, L Vannoli, R Vari, EW Varnes, C Varni, T Varol, D Varouchas, L Varriale, KE Varvell, ME Vasile, L Vaslin, GA Vasquez, F Vazeille, T Vazquez Schroeder, J Veatch, V Vecchio, MJ Veen, I Veliscek, LM Veloce, F Veloso, S Veneziano, A Ventura, A Verbytskyi, M Verducci, C Vergis, M Verissimo De Araujo, W Verkerke, JC Vermeulen, C 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Younas, CJS Young, C Young, Y Yu, M Yuan, R Yuan, L Yue, M Zaazoua, B Zabinski, E Zaid, T Zakareishvili, N Zakharchuk, S Zambito, JA Zamora Saa, J Zang, D Zanzi, O Zaplatilek, C Zeitnitz, H Zeng, JC Zeng, DT Zenger, O Zenin, T Ženiš, S Zenz, S Zerradi, D Zerwas, M Zhai, B Zhang, DF Zhang, J Zhang, J Zhang, K Zhang, L Zhang, P Zhang, R Zhang, S Zhang, T Zhang, X Zhang, X Zhang, Y Zhang, Y Zhang, Y Zhang, Z Zhang, Z Zhang, H Zhao, P Zhao, T Zhao, Y Zhao, Z Zhao, A Zhemchugov, K Zheng, X Zheng, Z Zheng, D Zhong, B Zhou, H Zhou, N Zhou, Y Zhou, CG Zhu, J Zhu, Y Zhu, Y Zhu, X Zhuang, K Zhukov, V Zhulanov, NI Zimine, J Zinsser, M Ziolkowski, L Živković, A Zoccoli, K Zoch, TG Zorbas, O Zormpa, W Zou, L ZwalinskiConstraints on the Higgs boson self-coupling from single- and double-Higgs production with the ATLAS detector using pp collisions at √s=13 TeV
Physics Letters B Elsevier 843 (2023) 137745
Authors:
G Aad, B Abbott, DC Abbott, Alan J Barr, Daniela Bortoletto, Tim L Bruckler, Federico Celli, Eimear I Conroy, Amanda Cooper-Sarkar, Maxence A Draguet, James A Frost, Gabriel Emmanuel Gallardo, Elizabeth Gallas, James A Grundy, Claire Gwenlan, Ynyr T Harris, Christopher P Hays, Brian Todd Huffman, Kla Karava, Zhenlong Li, Claudia Merlassino, Maria Mironova, Koichi Nagai, Luka Nedic, Christopher S Pollard, Richard B Nickerson, Karolos Potamianos, Elisabeth Schopf, Ian Shipsey, HA Smith, Miglė Stankaitytė, Iza Velišček, Georg HA Viehhauser, Yingjie Wei, Anthony R Weidberg, Philipp J Windischhofer, Ricardo Wölker, Jonas Wuerzinger, Siyuan YanAbstract:
Constraints on the Higgs boson self-coupling are set by combining double-Higgs boson analyses in the bb̅bb̅, bb̅τ+τ− and bb̅γγ decay channels with single-Higgs boson analyses targeting the γγ, ZZ∗, WW∗, τ+τ− and bb̅ decay channels. The data used in these analyses were recorded by the ATLAS detector at the LHC in proton–proton collisions at √s = 13 TeV and correspond to an integrated luminosity of 126–139 fb−1. The combination of the double-Higgs analyses sets an upper limit of μHH <2.4 at 95% confidence level on the double-Higgs production cross-section normalised to its Standard Model prediction. Combining the single-Higgs and double-Higgs analyses, with the assumption that new physics affects only the Higgs boson self-coupling (λHHH ), values outside the interval −0.4 < κλ = (λHHH /λSMHHH) < 6.3 are excluded at 95% confidence level. The combined single-Higgs and double-Higgs analyses provide results with fewer assumptions, by adding in the fit more coupling modifiers introduced to account for the Higgs boson interactions with the other Standard Model particles. In this relaxed scenario, the constraint becomes −1.4 < κλ < 6.1 at 95% CL.Observation of gauge boson joint-polarisation states in W±Z production from pp collisions at s=13 TeV with the ATLAS detector
Physics Letters B Elsevier 843 (2023) 137895
Authors:
G Aad, B Abbott, DC Abbott, K Abeling, SH Abidi, A Aboulhorma, H Abramowicz, H Abreu, Y Abulaiti, AC Abusleme Hoffman, BS Acharya, B Achkar, C Adam Bourdarios, L Adamczyk, L Adamek, SV Addepalli, J Adelman, A Adiguzel, S Adorni, T Adye, AA Affolder, Y Afik, MN Agaras, J Agarwala, A AggarwalAbstract:
In this letter we present results for next-to-leading-order electroweak corrections to doubly polarised W$^+$W$^-$ production at the LHC in the fully leptonic decay channel. We model the production and the decay of two polarised W bosons in the double-pole approximation, including factorisable real and virtual electroweak corrections, and separating polarisation states at amplitude level. We obtain integrated and differential predictions for polarised signals in a realistic fiducial setup.Comment: 10 pages, 1 table, 4 figureMeasurement of the polarisation of W bosons produced in top-quark decays using dilepton events at s=13 TeV with the ATLAS experiment
Physics Letters B Elsevier 843 (2023) 137829
Authors:
G Aad, B Abbott, DC Abbott, K Abeling, SH Abidi, A Aboulhorma, H Abramowicz, H Abreu, Y Abulaiti, AC Abusleme Hoffman, BS Acharya, C Adam Bourdarios, L Adamczyk, L Adamek, SV Addepalli, J Adelman, A Adiguzel, S Adorni, T Adye, AA Affolder, Y Afik, MN Agaras, J Agarwala, A Aggarwal, C AgheorghieseiAbstract:
A measurement of the polarisation of W bosons produced in top-quark decays is presented, using proton–proton collision data at a centre-of-mass energy of √s = 13 TeV. The data were collected by the ATLAS detector at the Large Hadron Collider and correspond to an integrated luminosity of 139 fb−1. The measurement is performed selecting tt¯ events decaying into final states with two charged leptons (electrons or muons) and at least two b-tagged jets. The polarisation is extracted from the differential cross-section distribution of the cos θ ∗ variable, where θ ∗ is the angle between the momentum direction of the charged lepton from the W boson decay and the reversed momentum direction of the b-quark from the top-quark decay, both calculated in the W boson rest frame. Parton-level results, corrected for the detector acceptance and resolution, are presented for the cos θ ∗ angle. The measured fractions of longitudinal, left- and right-handed polarisation states are found to be f0 = 0.684 ± 0.005 (stat.) ± 0.014 (syst.), fL = 0.318 ± 0.003 (stat.) ± 0.008 (syst.) and fR = −0.002 ± 0.002 (stat.) ± 0.014 (syst.), in agreement with the Standard Model predictionMeasurement of the total cross section and ρ-parameter from elastic scattering in pp collisions at s=13 TeV with the ATLAS detector
European Physical Journal C Springer Nature 83:5 (2023) 441