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Insertion of STC into TRT at the Department of Physics, Oxford
Credit: CERN

Koichi Nagai

Postdoctoral Research Assistant

Research theme

  • Fundamental particles and interactions

Sub department

  • Particle Physics

Research groups

  • ATLAS
koichi.nagai2@physics.ox.ac.uk
Telephone: +41754112314
  • About
  • Publications

Measurement of the energy response of the ATLAS calorimeter to charged pions from $$W^{\pm }\rightarrow \tau ^{\pm }(\rightarrow \pi ^{\pm }\nu _{\tau })\nu _{\tau }$$ events in Run 2 data

The European Physical Journal C SpringerOpen 82:3 (2022) 223

Authors:

G Aad, B Abbott, DC Abbott, A Abed Abud, K Abeling, DK Abhayasinghe, SH Abidi, A Aboulhorma, H Abramowicz, H Abreu, Y Abulaiti, AC Abusleme Hoffman, BS Acharya, B Achkar, L Adam, C Adam Bourdarios, L Adamczyk, L Adamek, SV Addepalli, J Adelman, A Adiguzel, S Adorni, T Adye, AA Affolder, Y Afik

Abstract:

Abstract The energy response of the ATLAS calorimeter is measured for single charged pions with transverse momentum in the range $$10<p_\text {T}<300$$ 10 < p T < 300 GeV. The measurement is performed using 139 $$\text {fb}^{-1}$$ fb - 1 of LHC proton–proton collision data at $$\sqrt{s}=13$$ s = 13 TeV taken in Run 2 by the ATLAS detector. Charged pions originating from $$\tau $$ τ -lepton decays are used to provide a sample of high- $$p_{\text {T}}$$ p T isolated particles, where the composition is known, to test an energy regime that has not previously been probed by in situ single-particle measurements. The calorimeter response to single-pions is observed to be overestimated by $${\sim }2\%$$ ∼ 2 % across a large part of the $$p_{\text {T}}$$ p T spectrum in the central region and underestimated by $${\sim }4\%$$ ∼ 4 % in the endcaps in the ATLAS simulation. The uncertainties in the measurements are $${\lesssim }1\%$$ ≲ 1 % for $$15<p_\text {T}<185$$ 15 < p T < 185 GeV in the central region. To investigate the source of the discrepancies, the width of the distribution of the ratio of calorimeter energy to track momentum, the energies per layer and response in the hadronic calorimeter are also compared between data and simulation.
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AtlFast3: The Next Generation of Fast Simulation in ATLAS

Computing and Software for Big Science Springer Nature 6:1 (2022) 7

Authors:

G Aad, B Abbott, DC Abbott, A Abed Abud, K Abeling, DK Abhayasinghe, SH Abidi, A Aboulhorma, H Abramowicz, H Abreu, Y Abulaiti, AC Abusleme Hoffman, BS Acharya, B Achkar, L Adam, C Adam Bourdarios, L Adamczyk, L Adamek, SV Addepalli, J Adelman, A Adiguzel, S Adorni, T Adye, AA Affolder, Y Afik

Abstract:

Monte Carlo simulations are a crucial component when analysing the Standard Model and New physics processes at the Large Hadron Collider (LHC). This paper aims to explore the use of generative models for increasing the statistics of Monte Carlo simulations in the final stage of data analysis by generating synthetic data that follows the same kinematic distributions for a limited set of analysis-specific observables to a high precision. Several state-of-the-art generative machine learning algorithms are adapted to this task, best performance is demonstrated by the normalizing flow architectures, which are capable of fast generation of an arbitrary number of new events. As an example of analysis-specific Monte Carlo simulated data, a well-known benchmark sample containing the Higgs boson production beyond the Standard Model and the corresponding irreducible background is used. The applicability of normalizing flows with different model parameters and numbers of initial events used in training is investigated. The resulting event distributions are compared with the original Monte Carlo distributions using statistical tests and a simplified statistical analysis to evaluate their similarity and quality of reproduction required in a physics analysis environment in a systematic way.Comment: 28 pages, 22 figure
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Search for Higgs bosons decaying into new spin-0 or spin-1 particles in four-lepton final states with the ATLAS detector with 139 fb−1 of pp collision data at $$ \sqrt{s} $$ = 13 TeV

Journal of High Energy Physics Springer 2022:3 (2022) 41

Authors:

G Aad, B Abbott, DC Abbott, A Abed Abud, K Abeling, DK Abhayasinghe, SH Abidi, A Aboulhorma, H Abramowicz, H Abreu, Y Abulaiti, AC Abusleme Hoffman, BS Acharya, B Achkar, L Adam, C Adam Bourdarios, L Adamczyk, L Adamek, SV Addepalli, J Adelman, A Adiguzel, S Adorni, T Adye, AA Affolder, Y Afik

Abstract:

We consider a model where the electroweak symmetry breaking is driven by strong dynamics, resulting in an electroweak doublet scalar condensate, and transmitted to the standard model matter fields via another electroweak doublet scalar. At low energies the effective theory therefore shares features with a type-I two Higgs doublet model. However, important differences arise due to the rich composite spectrum expected to contain new vector resonances accessible at the LHC. We carry out a systematic analysis of the vector resonance signals at LHC and find that the model remains viable, but will be tightly constrained by direct searches as the projected integrated luminosity, around 200 fb(-1), of the current run becomes available.Peer reviewe
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The ATLAS inner detector trigger performance in pp collisions at 13 TeV during LHC Run 2

European Physical Journal C Springer Nature 82:3 (2022) 206

Authors:

G Aad, B Abbott, DC Abbott, A Abed Abud, K Abeling, DK Abhayasinghe, SH Abidi, OS AbouZeid, NL Abraham, H Abramowicz, H Abreu, Y Abulaiti, BS Acharya, B Achkar, L Adam, C Adam Bourdarios, L Adamczyk, L Adamek, J Adelman, A Adiguzel, S Adorni, T Adye, AA Affolder, Y Afik, C Agapopoulou, MN Agaras, A Aggarwal, C Agheorghiesei, JA Aguilar-Saavedra, A Ahmad, F Ahmadov, WS Ahmed, X Ai, G Aielli, S Akatsuka, M Akbiyik, TPA Åkesson, E Akilli, AV Akimov, K Al Khoury, GL Alberghi, J Albert, MJ Alconada Verzini, S Alderweireldt, M Aleksa, IN Aleksandrov, C Alexa, T Alexopoulos, A Alfonsi, F Alfonsi, M Alhroob, B Ali, S Ali, M Aliev, G Alimonti, C Allaire, BMM Allbrooke, PP Allport, A Aloisio, F Alonso, C Alpigiani, E Alunno Camelia, M Alvarez Estevez, MG Alviggi, Y Amaral Coutinho, A Ambler, L Ambroz, C Amelung, D Amidei, SP Amor Dos Santos, S Amoroso, CS Amrouche, C Anastopoulos, N Andari, T Andeen, JK Anders, SY Andrean, A Andreazza, V Andrei, CR Anelli, S Angelidakis, A Angerami, AV Anisenkov, A Annovi, C Antel, MT Anthony, E Antipov, M Antonelli, DJA Antrim, F Anulli, M Aoki, JA Aparisi Pozo, MA Aparo, L Aperio Bella, N Aranzabal, V Araujo Ferraz, R Araujo Pereira, C Arcangeletti, ATH Arce, J-F Arguin, S Argyropoulos, J-H Arling, AJ Armbruster, A Armstrong, O Arnaez, H Arnold, ZP Arrubarrena Tame, G Artoni, H Asada, K Asai, S Asai, T Asawatavonvanich, NA Asbah, EM Asimakopoulou, L Asquith, J Assahsah, K Assamagan, R Astalos, RJ Atkin, M Atkinson, NB Atlay, H Atmani, PA Atmasiddha, K Augsten, VA Austrup, G Avolio, MK Ayoub, G Azuelos, D Babal, H Bachacou, K Bachas, F Backman, P Bagnaia, H Bahrasemani, AJ Bailey, VR Bailey, JT Baines, C Bakalis, OK Baker, PJ Bakker, E Bakos, D Bakshi Gupta, S Balaji, R Balasubramanian, EM Baldin, P Balek, F Balli, WK Balunas, J Balz, E Banas, M Bandieramonte, A Bandyopadhyay, L Barak, WM Barbe, EL Barberio, D Barberis, M Barbero, G Barbour, T Barillari, M-S Barisits, J Barkeloo, T Barklow, BM Barnett, RM Barnett, Z Barnovska-Blenessy, A Baroncelli, G Barone, AJ Barr, L Barranco Navarro, F Barreiro, J Barreiro Guimarães da Costa, U Barron, S Barsov, F Bartels, R Bartoldus, G Bartolini, AE Barton, P Bartos, A Basalaev, A Basan, A Bassalat, MJ Basso, CR Basson, RL Bates, S Batlamous, JR Batley, B Batool, M Battaglia, M Bauce, F Bauer, P Bauer, HS Bawa, A Bayirli, JB Beacham, T Beau, PH Beauchemin, F Becherer, P Bechtle, HP Beck, K Becker, C Becot, AJ Beddall, VA Bednyakov, CP Bee, TA Beermann, M Begalli, M Begel, A Behera, JK Behr, F Beisiegel, M Belfkir, G Bella, L Bellagamba, A Bellerive, P Bellos, K Beloborodov, K Belotskiy, NL Belyaev, D Benchekroun, N Benekos, Y Benhammou, DP Benjamin, M Benoit, JR Bensinger, S Bentvelsen, L Beresford, M Beretta, D Berge, E Bergeaas Kuutmann, N Berger, B Bergmann, LJ Bergsten, J Beringer, S Berlendis, G Bernardi, C Bernius, FU Bernlochner, T Berry, P Berta, A Berthold, IA Bertram, O Bessidskaia Bylund, S Bethke, A Betti, AJ Bevan, S Bhatta, DS Bhattacharya, P Bhattarai, VS Bhopatkar, R Bi, RM Bianchi, O Biebel, D Biedermann, R Bielski, K Bierwagen, NV Biesuz, M Biglietti, TRV Billoud, M Bindi, A Bingul, C Bini, S Biondi, CJ Birch-sykes, M Birman, T Bisanz, JP Biswal, D Biswas, A Bitadze, C Bittrich, K Bjørke, T Blazek, I Bloch, C Blocker, A Blue, U Blumenschein, J Blumenthal, GJ Bobbink, VS Bobrovnikov, D Bogavac, AG Bogdanchikov, C Bohm, V Boisvert, P Bokan, T Bold, M Bomben, M Bona, JS Bonilla, M Boonekamp, CD Booth, AG Borbély, HM Borecka-Bielska, LS Borgna, A Borisov, G Borissov, D Bortoletto, D Boscherini, M Bosman, JD Bossio Sola, K Bouaouda, J Boudreau, EV Bouhova-Thacker, D Boumediene, R Bouquet, A Boveia, J Boyd, D Boye, IR Boyko, AJ Bozson, J Bracinik, N Brahimi, G Brandt, O Brandt, F Braren, B Brau, JE Brau, WD Breaden Madden, K Brendlinger, R Brener, L Brenner, R Brenner, S Bressler, B Brickwedde, DL Briglin, D Britton, D Britzger, I Brock, R Brock, G Brooijmans, WK Brooks, E Brost, PA Bruckman de Renstrom, B Brüers, D Bruncko, A Bruni, G Bruni, M Bruschi, N Bruscino, L Bryngemark, T Buanes, Q Buat, P Buchholz, AG Buckley, IA Budagov, MK Bugge, O Bulekov, BA Bullard, TJ Burch, S Burdin, CD Burgard, AM Burger, B Burghgrave, JTP Burr, CD Burton, JC Burzynski, V Büscher, E Buschmann, PJ Bussey, JM Butler, CM Buttar, JM Butterworth, W Buttinger, CJ Buxo Vazquez, AR Buzykaev, G Cabras, S Cabrera Urbán, D Caforio, H Cai, VMM Cairo, O Cakir, N Calace, P Calafiura, G Calderini, P Calfayan, G Callea, LP Caloba, A Caltabiano, S Calvente Lopez, D Calvet, S Calvet, TP Calvet, M Calvetti, R Camacho Toro, S Camarda, D Camarero Munoz, P Camarri, MT Camerlingo, D Cameron, C Camincher, M Campanelli, A Camplani, V Canale, A Canesse, M Cano Bret, J Cantero, Y Cao, M Capua, R Cardarelli, F Cardillo, G Carducci, T Carli, G Carlino, BT Carlson, EM Carlson, L Carminati, RMD Carney, S Caron, E Carquin, S Carrá, G Carratta, JWS Carter, TM Carter, MP Casado, AF Casha, EG Castiglia, FL Castillo, L Castillo Garcia, V Castillo Gimenez, NF Castro, A Catinaccio, JR Catmore, A Cattai, V Cavaliere, V Cavasinni, E Celebi, F Celli, K Cerny, AS Cerqueira, A Cerri, L Cerrito, F Cerutti, A Cervelli, SA Cetin, Z Chadi, D Chakraborty, J Chan, WS Chan, WY Chan, JD Chapman, B Chargeishvili, DG Charlton, TP Charman, M Chatterjee, CC Chau, S Chekanov, SV Chekulaev, GA Chelkov, B Chen, C Chen, CH Chen, H Chen, H Chen, J Chen, J Chen, J Chen, S Chen, SJ Chen, X Chen, Y Chen, Y-H Chen, HC Cheng, HJ Cheng, A Cheplakov, E Cheremushkina, R Cherkaoui El Moursli, E Cheu, K Cheung, TJA Chevalérias, L Chevalier, V Chiarella, G Chiarelli, G Chiodini, AS Chisholm, A Chitan, I Chiu, YH Chiu, MV Chizhov, K Choi, AR Chomont, Y Chou, YS Chow, LD Christopher, MC Chu, X Chu, J Chudoba, JJ Chwastowski, D Cieri, KM Ciesla, V Cindro, IA Cioară, A Ciocio, F Cirotto, ZH Citron, M Citterio, DA Ciubotaru, BM Ciungu, A Clark, PJ Clark, SE Clawson, C Clement, L Clissa, Y Coadou, M Cobal, A Coccaro, J Cochran, R Coelho Lopes De Sa, H Cohen, AEC Coimbra, B Cole, J Collot, P Conde Muiño, SH Connell, IA Connelly, F Conventi, AM Cooper-Sarkar, F Cormier, LD Corpe, M Corradi, EE Corrigan, F Corriveau, MJ Costa, F Costanza, D Costanzo, G Cowan, JW Cowley, J Crane, K Cranmer, RA Creager, S Crépé-Renaudin, F Crescioli, M Cristinziani, M Cristoforetti, V Croft, G Crosetti, A Cueto, T Cuhadar Donszelmann, H Cui, AR Cukierman, WR Cunningham, S Czekierda, P Czodrowski, MM Czurylo, MJ Da Cunha Sargedas De Sousa, JV Da Fonseca Pinto, C Da Via, W Dabrowski, F Dachs, T Dado, S Dahbi, T Dai, C Dallapiccola, M Dam, G D’amen, V D’Amico, J Damp, JR Dandoy, MF Daneri, M Danninger, V Dao, G Darbo, O Dartsi, A Dattagupta, S D’Auria, C David, T Davidek, DR Davis, I Dawson, K De, R De Asmundis, M De Beurs, S De Castro, N De Groot, P de Jong, H De la Torre, A De Maria, D De Pedis, A De Salvo, U De Sanctis, M De Santis, A De Santo, JB De Vivie De Regie, DV Dedovich, AM Deiana, J Del Peso, Y Delabat Diaz, D Delgove, F Deliot, CM Delitzsch, M Della Pietra, D Della Volpe, A Dell’Acqua, L Dell’Asta, M Delmastro, C Delporte, PA Delsart, S Demers, M Demichev, G Demontigny, SP Denisov, L D’Eramo, D Derendarz, JE Derkaoui, F Derue, P Dervan, K Desch, K Dette, C Deutsch, PO Deviveiros, FA Di Bello, A Di Ciaccio, L Di Ciaccio, C Di Donato, A Di Girolamo, G Di Gregorio, A Di Luca, B Di Micco, R Di Nardo, R Di Sipio, C Diaconu, FA Dias, T Dias Do Vale, MA Diaz, FG Diaz Capriles, J Dickinson, M Didenko, EB Diehl, J Dietrich, S Díez Cornell, C Diez Pardos, A Dimitrievska, W Ding, J Dingfelder, SJ Dittmeier, F Dittus, F Djama, T Djobava, JI Djuvsland, MAB Do Vale, M Dobre, D Dodsworth, C Doglioni, J Dolejsi, Z Dolezal, M Donadelli, B Dong, J Donini, A D’onofrio, M D’Onofrio, J Dopke, A Doria, MT Dova, AT Doyle, E Drechsler, E Dreyer, T Dreyer, AS Drobac, D Du, TA du Pree, Y Duan, F Dubinin, M Dubovsky, A Dubreuil, E Duchovni, G Duckeck, OA Ducu, D Duda, A Dudarev, AC Dudder, M D’uffizi, L Duflot, M Dührssen, C Dülsen, M Dumancic, AE Dumitriu, M Dunford, S Dungs, A Duperrin, H Duran Yildiz, M Düren, A Durglishvili, B Dutta, D Duvnjak, GI Dyckes, M Dyndal, S Dysch, BS Dziedzic, MG Eggleston, T Eifert, G Eigen, K Einsweiler, T Ekelof, H El Jarrari, A El Moussaouy, V Ellajosyula, M Ellert, F Ellinghaus, AA Elliot, N Ellis, J Elmsheuser, M Elsing, D Emeliyanov, A Emerman, Y Enari, J Erdmann, A Ereditato, PA Erland, M Errenst, M Escalier, C Escobar, O Estrada Pastor, E Etzion, G Evans, H Evans, MO Evans, A Ezhilov, F Fabbri, L Fabbri, V Fabiani, G Facini, RM Fakhrutdinov, S Falciano, PJ Falke, S Falke, J Faltova, Y Fang, Y Fang, G Fanourakis, M Fanti, M Faraj, A Farbin, A Farilla, EM Farina, T Farooque, SM Farrington, P Farthouat, F Fassi, D Fassouliotis, M Faucci Giannelli, WJ Fawcett, L Fayard, OL Fedin, M Feickert, L Feligioni, A Fell, C Feng, M Feng, MJ Fenton, AB Fenyuk, SW Ferguson, J Ferrando, A Ferrari, P Ferrari, R Ferrari, D Ferrere, C Ferretti, F Fiedler, A Filipčič, F Filthaut, KD Finelli, MCN Fiolhais, L Fiorini, F Fischer, WC Fisher, T Fitschen, I Fleck, P Fleischmann, T Flick, BM Flierl, L Flores, LR Flores Castillo, FM Follega, N Fomin, JH Foo, GT Forcolin, BC Forland, A Formica, FA Förster, AC Forti, E Fortin, MG Foti, D Fournier, H Fox, P Francavilla, S Francescato, M Franchini, S Franchino, D Francis, L Franco, L Franconi, M Franklin, G Frattari, PM Freeman, B Freund, WS Freund, EM Freundlich, DC Frizzell, D Froidevaux, JA Frost, M Fujimoto, E Fullana Torregrosa, T Fusayasu, J Fuster, A Gabrielli, A Gabrielli, P Gadow, G Gagliardi, LG Gagnon, GE Gallardo, EJ Gallas, BJ Gallop, R Gamboa Goni, KK Gan, S Ganguly, J Gao, Y Gao, YS Gao, FM Garay Walls, C García, JE García Navarro, JA García Pascual, M Garcia-Sciveres, RW Gardner, S Gargiulo, CA Garner, V Garonne, SJ Gasiorowski, P Gaspar, G Gaudio, P Gauzzi, IL Gavrilenko, A Gavrilyuk, C Gay, G Gaycken, EN Gazis, AA Geanta, CM Gee, CNP Gee, J Geisen, M Geisen, C Gemme, MH Genest, C Geng, S Gentile, S George, T Geralis, LO Gerlach, P Gessinger-Befurt, G Gessner, M Ghasemi Bostanabad, M Ghneimat, A Ghosh, A Ghosh, B Giacobbe, S Giagu, N Giangiacomi, P Giannetti, A Giannini, G Giannini, SM Gibson, M Gignac, DT Gil, BJ Gilbert, D Gillberg, G Gilles, NEK Gillwald, DM Gingrich, MP Giordani, PF Giraud, G Giugliarelli, D Giugni, F Giuli, S Gkaitatzis, I Gkialas, EL Gkougkousis, P Gkountoumis, LK Gladilin, C Glasman, GR Gledhill, I Gnesi, M Goblirsch-Kolb, D Godin, S Goldfarb, T Golling, D Golubkov, A Gomes, R Goncalves Gama, R Gonçalo, G Gonella, L Gonella, A Gongadze, F Gonnella, JL Gonski, S González de la Hoz, S Gonzalez Fernandez, R Gonzalez Lopez, C Gonzalez Renteria, R Gonzalez Suarez, S Gonzalez-Sevilla, GR Gonzalvo Rodriguez, L Goossens, NA Gorasia, PA Gorbounov, HA Gordon, B Gorini, E Gorini, A Gorišek, AT Goshaw, MI Gostkin, CA Gottardo, M Gouighri, AG Goussiou, N Govender, C Goy, I Grabowska-Bold, E Gramstad, S Grancagnolo, M Grandi, V Gratchev, PM Gravila, FG Gravili, C Gray, HM Gray, C Grefe, IM Gregor, P Grenier, K Grevtsov, C Grieco, NA Grieser, AA Grillo, K Grimm, S Grinstein, J-F Grivaz, S Groh, E Gross, J Grosse-Knetter, ZJ Grout, C Grud, A Grummer, JC Grundy, L Guan, W Guan, C Gubbels, J Guenther, JGR Guerrero Rojas, F Guescini, D Guest, R Gugel, A Guida, T Guillemin, S Guindon, J Guo, Z Guo, R Gupta, S Gurbuz, G Gustavino, M Guth, P Gutierrez, LF Gutierrez Zagazeta, C Gutschow, C Guyot, C Gwenlan, CB Gwilliam, ES Haaland, A Haas, C Haber, HK Hadavand, A Hadef, M Haleem, J Haley, JJ Hall, G Halladjian, GD Hallewell, K Hamano, H Hamdaoui, M Hamer, GN Hamity, K Han, L Han, L Han, S Han, YF Han, K Hanagaki, M Hance, MD Hank, R Hankache, E Hansen, JB Hansen, JD Hansen, MC Hansen, PH Hansen, EC Hanson, K Hara, T Harenberg, S Harkusha, PF Harrison, NM Hartman, NM Hartmann, Y Hasegawa, A Hasib, S Hassani, S Haug, R Hauser, M Havranek, CM Hawkes, RJ Hawkings, S Hayashida, D Hayden, C Hayes, RL Hayes, CP Hays, JM Hays, HS Hayward, SJ Haywood, F He, Y He, MP Heath, V Hedberg, AL Heggelund, ND Hehir, C Heidegger, KK Heidegger, WD Heidorn, J Heilman, S Heim, T Heim, B Heinemann, JG Heinlein, JJ Heinrich, L Heinrich, J Hejbal, L Helary, A Held, S Hellesund, CM Helling, S Hellman, C Helsens, RCW Henderson, L Henkelmann, AM Henriques Correia, H Herde, Y Hernández Jiménez, H Herr, MG Herrmann, T Herrmann, G Herten, R Hertenberger, L Hervas, NP Hessey, H Hibi, S Higashino, E Higón-Rodriguez, K Hildebrand, JC Hill, KK Hill, KH Hiller, SJ Hillier, M Hils, I Hinchliffe, F Hinterkeuser, M Hirose, S Hirose, D Hirschbuehl, B Hiti, O Hladik, J Hobbs, R Hobincu, N Hod, MC Hodgkinson, A Hoecker, D Hohn, D Hohov, T Holm, TR Holmes, M Holzbock, LBAH Hommels, TM Hong, JC Honig, A Hönle, BH Hooberman, WH Hopkins, Y Horii, P Horn, LA Horyn, S Hou, J Howarth, J Hoya, M Hrabovsky, A Hrynevich, T Hryn’ova, PJ Hsu, S-C Hsu, Q Hu, S Hu, YF Hu, DP Huang, X Huang, Y Huang, Y Huang, Z Hubacek, F Hubaut, M Huebner, F Huegging, TB Huffman, M Huhtinen, R Hulsken, RFH Hunter, N Huseynov, J Huston, J Huth, R Hyneman, S Hyrych, G Iacobucci, G Iakovidis, I Ibragimov, L Iconomidou-Fayard, P Iengo, R Ignazzi, R Iguchi, T Iizawa, Y Ikegami, A Ilg, N Ilic, H Imam, G Introzzi, M Iodice, K Iordanidou, V Ippolito, MF Isacson, M Ishino, W Islam, C Issever, S Istin, JM Iturbe Ponce, R Iuppa, A Ivina, JM Izen, V Izzo, P Jacka, P Jackson, RM Jacobs, BP Jaeger, G Jäkel, KB Jakobi, K Jakobs, T Jakoubek, J Jamieson, KW Janas, R Jansky, PA Janus, G Jarlskog, AE Jaspan, N Javadov, T Javůrek, M Javurkova, F Jeanneau, L Jeanty, J Jejelava, P Jenni, S Jézéquel, J Jia, Z Jia, Y Jiang, S Jiggins, FA Jimenez Morales, J Jimenez Pena, S Jin, A Jinaru, O Jinnouchi, H Jivan, P Johansson, KA Johns, CA Johnson, E Jones, RWL Jones, SD Jones, TJ Jones, J Jovicevic, X Ju, JJ Junggeburth, A Juste Rozas, A Kaczmarska, M Kado, H Kagan, M Kagan, A Kahn, C Kahra, T Kaji, E Kajomovitz, CW Kalderon, A Kaluza, A Kamenshchikov, M Kaneda, NJ Kang, S Kang, Y Kano, J Kanzaki, D Kar, K Karava, MJ Kareem, I Karkanias, SN Karpov, ZM Karpova, V Kartvelishvili, AN Karyukhin, E Kasimi, C Kato, J Katzy, K Kawade, K Kawagoe, T Kawaguchi, T Kawamoto, G Kawamura, EF Kay, FI Kaya, S Kazakos, VF Kazanin, Y Ke, JM Keaveney, R Keeler, JS Keller, D Kelsey, JJ Kempster, J Kendrick, KE Kennedy, O Kepka, S Kersten, BP Kerševan, S Ketabchi Haghighat, F Khalil-Zada, M Khandoga, A Khanov, AG Kharlamov, T Kharlamova, EE Khoda, TJ Khoo, G Khoriauli, E Khramov, J Khubua, S Kido, M Kiehn, A Kilgallon, E Kim, YK Kim, N Kimura, A Kirchhoff, D Kirchmeier, J Kirk, AE Kiryunin, T Kishimoto, DP Kisliuk, V Kitali, C Kitsaki, O Kivernyk, T Klapdor-Kleingrothaus, M Klassen, C Klein, L Klein, MH Klein, M Klein, U Klein, P Klimek, A Klimentov, F Klimpel, T Klingl, T Klioutchnikova, FF Klitzner, P Kluit, S Kluth, E Kneringer, A Knue, D Kobayashi, M Kobel, M Kocian, T Kodama, P Kodys, DM Koeck, PT Koenig, T Koffas, NM Köhler, M Kolb, I Koletsou, T Komarek, K Köneke, AXY Kong, T Kono, V Konstantinides, N Konstantinidis, B Konya, R Kopeliansky, S Koperny, K 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Observation of electroweak production of two jets in association with an isolated photon and missing transverse momentum, and search for a Higgs boson decaying into invisible particles at 13 $$\text {TeV}$$ with the ATLAS detector

The European Physical Journal C SpringerOpen 82:2 (2022) 105

Authors:

G Aad, B Abbott, DC Abbott, A Abed Abud, K Abeling, DK Abhayasinghe, SH Abidi, A Aboulhorma, H Abramowicz, H Abreu, Y Abulaiti, AC Abusleme Hoffman, BS Acharya, B Achkar, L Adam, C Adam Bourdarios, L Adamczyk, L Adamek, SV Addepalli, J Adelman, A Adiguzel, S Adorni, T Adye, AA Affolder, Y Afik

Abstract:

This paper presents a measurement of the electroweak production of two jets in association with a Zγ pair, with the Z boson decaying into two neutrinos. It also presents a search for invisible or partially invisible decays of a Higgs boson with a mass of 125 GeV produced through vectorboson fusion with a photon in the final state. These results use data from LHC proton–proton collisions at sqrt(s) = 13 TeV collected with the ATLAS detector and corresponding to an integrated luminosity of 139 fb−1. The event signature, shared by all benchmark processes considered for the measurements and searches, is characterized by a significant amount of unbalanced transverse momentum and a photon in the final state, in addition to a pair of forward jets. Electroweak Zγ production in association with two jets is observed in this final state with a significance of 5.2 (5.1 expected) standard deviations. The measured fiducial cross-section for this process is 1.31 ± 0.29 fb. An observed (expected) upper limit of 0.37 (0.34+0.15 −0.10) at 95% confidence level is set on the branching ratio of a 125 GeV Higgs boson to invisible particles, assuming the Standard Model production cross-section. The signature is also interpreted in the context of decays of a Higgs boson into a photon and a dark photon. An observed (expected) 95% CL upper limit on the branching ratio for this decay is set at 0.018 (0.017+0.007−0.005), assuming the Standard Model production cross-section for a 125 GeV Higgs boson
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