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

Dr William Balunas

Visitor

Research theme

  • Fundamental particles and interactions

Sub department

  • Particle Physics
william.balunas@physics.ox.ac.uk
Denys Wilkinson Building, room 604
  • About
  • Publications

Higgs self-coupling measurements using deep learning in the b¯bb¯b final state

Journal of High Energy Physics Springer 2020:12 (2020) 115

Authors:

Jacob Amacker, William Balunas, Lydia Beresford, Daniela Bortoletto, James Frost, Cigdem Issever, Jesse Liu, James McKee, Alessandro Micheli, Santiago Paredes Saenz, Michael Spannowsky, Beojan Stanislaus

Abstract:

Measuring the Higgs trilinear self-coupling λhhh is experimentally demanding but fundamental for understanding the shape of the Higgs potential. We present a comprehensive analysis strategy for the HL-LHC using di-Higgs events in the four b-quark channel (hh → 4b), extending current methods in several directions. We perform deep learning to suppress the formidable multijet background with dedicated optimisation for BSM λhhh scenarios. We compare the λhhh constraining power of events using different multiplicities of large radius jets with a two-prong structure that reconstruct boosted h → bb decays. We show that current uncertainties in the SM top Yukawa coupling yt can modify λhhh constraints by ∼ 20%. For SM yt, we find prospects of −0.8 < 𝜆ℎℎℎ/𝜆SMℎℎℎ < 6.6 at 68% CL under simplified assumptions for 3000 fb−1 of HL-LHC data. Our results provide a careful assessment of di-Higgs identification and machine learning techniques for all-hadronic measurements of the Higgs self-coupling and sharpens the requirements for future improvement.
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Constraints on mediator-based dark matter and scalar dark energy models using s√ = 13 TeV pp collision data collected by the ATLAS detector

Journal of High Energy Physics Springer 2019:5 (2019) 142

Authors:

BM Barnett, RM Barnett, Z Barnovska-Blenessy, JBG Da Costa, R Bartoldus, S Batlamous, JB Beacham, T Beau, C Becot, A Beddall, M Begel, A Behera, K Beloborodov, K Belotskiy, DP Benjamin, M Benoit, B Bergmann, LJ Bergsten, FU Bernlochner, T Berry, P Berta, A Bethani, S Bethke, D Biedermann

Abstract:

Constraints on selected mediator-based dark matter models and a scalar dark energy model using up to 37 fb−1s√ = 13 TeV pp collision data collected by the ATLAS detector at the LHC during 2015-2016 are summarised in this paper. The results of experimental searches in a variety of final states are interpreted in terms of a set of spin-1 and spin-0 single-mediator dark matter simplified models and a second set of models involving an extended Higgs sector plus an additional vector or pseudo-scalar mediator. The searches considered in this paper constrain spin-1 leptophobic and leptophilic mediators, spin-0 colour-neutral and colour-charged mediators and vector or pseudo-scalar mediators embedded in extended Higgs sector models. In this case, also s√ = 8 TeV pp collision data are used for the interpretation of the results. The results are also interpreted for the first time in terms of light scalar particles that could contribute to the accelerating expansion of the universe (dark energy).
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Search for invisible Higgs boson decays in vector boson fusion at root s=13 TeV with the ATLAS detector

PHYSICS LETTERS B 793 (2019) 499-519

Authors:

M Aaboud, G Aad, B Abbott, O Abdinov, B Abeloos, DK Abhayasinghe, SH Abidi, OS AbouZeid, NL Abraham, H Abramowicz, H Abreu, Y Abulaiti, BS Acharya, S Adachi, L Adamczyk, J Adelman, M Adersberger, A Adiguzel, T Adye, AA Affolder, Y Afik, C Agheorghiesei, JA Aguilar-Saavedra, F Ahmadov, G Aielli, S Akatsuka, TPA Akesson, E Akilli, AV Akimov, GL Alberghi, J Albert, P Albicocco, MJ Alconada Verzini, S Alderweireldt, M Aleksa, IN Aleksandrov, C Alexa, T Alexopoulos, M Alhroob, B Ali, G Alimonti, J Alison, SP Alkire, C Allaire, BMM Allbrooke, BW Allen, PP Allport, A Aloisio, A Alonso, F Alonso, C Alpigiani, AA Alshehri, MI Alstaty, B Alvarez Gonzalez, D Alvarez Piqueras, MG Alviggi, BT Amadio, Y Amaral Coutinho, L Ambroz, C Amelung, D Amidei, SP Amor Dos Santos, S Amoroso, CS Amrouche, C Anastopoulos, LS Ancu, N Andari, T Andeen, CF Anders, JK Anders, KJ Anderson, A Andreazza, V Andrei, CR Anelli, S Angelidakis, I Angelozzi, A Angerami, AV Anisenkov, A Annovi, C Antel, MT Anthony, M Antonelli, DJA Antrim, F Anulli, M Aoki, L Aperio Bella, G Arabidze, JP Araque, V Araujo Ferraz, R Araujo Pereira, ATH Arce, RE Ardell, FA Arduh, J-F Arguin, S Argyropoulos, AJ Armbruster, LJ Armitage, A Armstrong, O Arnaez, H Arnold, M Arratia, O Arslan, A Artamonov, G Artoni, S Artz, S Asai, N Asbah, A Ashkenazi, EM Asimakopoulou, L Asquith, K Assamagan, R Astalos, RJ Atkin, M Atkinson, NB Atlay, K Augsten, G Avolio, R Avramidou, MK Ayoub, G Azuelos, AE Baas, MJ Baca, H Bachacou, K Bachas, M Backes, P Bagnaia, M Bahmani, H Bahrasemani, AJ Bailey, JT Baines, M Bajic, C Bakalis, OK Baker, PJ Bakker, D Bakshi Gupta, EM Baldin, P Balek, F Balli, WK Balunas, J Balz, E Banas, A Bandyopadhyay, S Banerjee, AAE Bannoura, L Barak, WM Barbe, EL Barberio, D Barberis, M Barbero, T Barillari, M-S Barisits, J Barkeloo, T Barklow, N Barlow, R Barnea, SL Barnes, BM Barnett, RM Barnett, Z Barnovska-Blenessy, A Baroncelli, G Barone, AJ Barr, L Barranco Navarro, F Barreiro, J Barreiro Guimaraes da Costa, R Bartoldus, AE Barton, P Bartos, A Basalaev, A Bassalat, RL Bates, SJ Batista, S Batlamous, JR Batley, M Battaglia, M Bauce, F Bauer, KT Bauer, HS Bawa, JB Beacham, MD Beattie, T Beau, PH Beauchemin, P Bechtle, HC Beck, HP Beck, K Becker, M Becker, C Becot, A Beddall, AJ Beddall, VA Bednyakov, M Bedognetti, CP Bee, TA Beermann, M Begalli, M Begel, A Behera, JK Behr, AS Bell, G Bella, L Bellagamba, A Bellerive, M Bellomo, P Bellos, K Belotskiy, NL Belyaev, O Benary, D Benchekroun, M Bender, N Benekos, Y Benhammou, E Benhar Noccioli, J Benitez, DP Benjamin, M Benoit, JR Bensinger, S Bentvelsen, L Beresford, M Beretta, D Berge, E Bergeaas Kuutmann, N Berger, LJ Bergsten, J Beringer, S Berlendis, NR Bernard, G Bernardi, C Bernius, FU Bernlochner, T Berry, P Berta, C Bertella, G Bertoli, IA Bertram, GJ Besjes, O Bessidskaia Bylund, M Bessner, N Besson, A Bethani, S Bethke, A Betti, AJ Bevan, J Beyer, RM Bianchi, O Biebel, D Biedermann, R Bielski, K Bierwagen, NV Biesuz, M Biglietti, TRV Billoud, M Bindi, A Bingul, C Bini, S Biondi, M Birman, T Bisanz, JP Biswal, C Bittrich, DM Bjergaard, JE Black, KM Black, T Blazek, I Bloch, C Blocker, A Blue, U Blumenschein, Dr Blunier, GJ Bobbink, VS Bobrovnikov, SS Bocchetta, A Bocci, D Boerner, D Bogavac, AG Bogdanchikov, C Bohm, V Boisvert, P Bokan, T Bold, AS Boldyrev, AE Bolz, M Bomben, M Bona, JS Bonilla, M Boonekamp, A Borisov, G Borissov, J Bortfeldt, D Bortoletto, V Bortolotto, D Boscherini, M Bosman, JD Bossio Sola, K Bouaouda, J Boudreau, EV Bouhova-Thacker, D Boumediene, C Bourdarios, SK Boutle, A Boveia, J Boyd, IR Boyko, AJ Bozson, J Bracinik, N Brahimi, A Brandt, G Brandt, O Brandt, F Braren, U Bratzler, B Brau, JE Brau, WD Breaden Madden, K Brendlinger, AJ Brennan, L Brenner, R Brenner, S Bressler, B Brickwedde, DL Briglin, D Britton, D Britzger, I Brock, R Brock, G Brooijmans, T Brooks, WK Brooks, E Brost, JH Broughton, PA Bruckman de Renstrom, D Bruncko, A Bruni, G Bruni, LS Bruni, S Bruno, BH Brunt, M Bruschi, N Bruscino, P Bryant, L Bryngemark, T Buanes, Q Buat, P Buchholz, AG Buckley, IA Budagov, MK Bugge, F Buehrer, O Bulekov, D Bullock, TJ Burch, S Burdin, CD Burgard, AM Burger, B Burghgrave, K Burka, S Burke, I Burmeister, JTP Burr, D Buescher, V Buescher, E Buschmann, P Bussey, JM Butler, CM Buttar, JM Butterworth, P Butti, W Buttinger, A Buzatu, AR Buzykaev, G Cabras, S Cabrera Urban, D Caforio, H Cai, VMM Cairo, O Cakir, N Calace, P Calafiura, A Calandri, G Calderini, P Calfayan, G Callea, LP Caloba, S Calvente Lopez, D Calvet, S Calvet, TP Calvet, M Calvetti, R Camacho Toro, S Camarda, P Camarri, D Cameron, R Caminal Armadans, C Camincher, S Campana, M Campanelli, A Camplani, A Campoverde, V Canale, M Cano Bret, J Cantero, T Cao, Y Cao, MDM Capeans Garrido, I Caprini, M Caprini, M Capua, RM Carbone, R Cardarelli, FC Cardillo, I Carli, T Carli, G Carlino, BT Carlson, L Carminati, RMD Carney, S Caron, E Carquin, S Carra, GD Carrillo-Montoya, D Casadei, MP Casado, AF Casha, M Casolino, DW Casper, R Castelijn, FL Castillo, V Castillo Gimenez, NF Castro, A Catinaccio, JR Catmore, A Cattai, J Caudron, V Cavaliere, E Cavallaro, D Cavalli, M Cavalli-Sforza, V Cavasinni, E Celebi, F Ceradini, L Cerda Alberich, AS Cerqueira, A Cerri, L Cerrito, F Cerutti, A Cervelli, SA Cetin, A Chafaq, D Chakraborty, SK Chan, WS Chan, YL Chan, JD Chapman, DG Charlton, CC Chau, CA Chavez Barajas, S Che, A Chegwidden, S Chekanov, SV Chekulaev, GA Chelkov, MA Chelstowska, C Chen, CH Chen, H 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, L Chevalier, V Chiarella, G Chiarelli, G Chiodini, AS Chisholm, A Chitan, I Chiu, YH Chiu, MV Chizhov, K Choi, AR Chomont, S Chouridou, YS Chow, V Christodoulou, MC Chu, J Chudoba, AJ Chuinard, JJ Chwastowski, L Chytka, D Cinca, V Cindro, IA Cioara, A Ciocio, F Cirotto, ZH Citron, M Citterio, A Clark, MR Clark, PJ Clark, C Clement, Y Coadou, M Cobal, A Coccaro, J Cochran, AEC Coimbra, L Colasurdo, B Cole, AP Colijn, J Collot, P Conde Muino, E Coniavitis, SH Connell, IA Connelly, S Constantinescu, F Conventi, AM Cooper-Sarkar, F Cormier, KJR Cormier, M Corradi, EE Corrigan, F Corriveau, A Cortes-Gonzalez, MJ Costa, D Costanzo, G Cottin, G Cowan, BE Cox, J Crane, K Cranmer, SJ Crawley, RA Creager, G Cree, S Crepe-Renaudin, F Crescioli, M Cristinziani, V Croft, G Crosetti, A Cueto, T Cuhadar Donszelmann, AR Cukierman, J Cuth, S Czekierda, P Czodrowski, MJ Da Cunha Sargedas De Sousa, C Da Via, W Dabrowski, T Dado, S Dahbi, T Dai, F Dallaire, C Dallapiccola, M Dam, G D'amen, J Damp, JR Dandoy, MF Daneri, NP Dang, ND Dann, M Danninger, V Dao, G Darbo, S Darmora, O Dartsi, A Dattagupta, T Daubney, S D'Auria, W Davey, C David, T Davidek, DR Davis, E Dawe, I Dawson, K De, R De Asmundis, A De Benedetti, M De Beurs, S De Castro, S De Cecco, N De Groot, P De Jong, H De la Torre, F De Lorenzi, A De Maria, D De Pedis, A De Salvo, U De Sanctis, A De Santo, K De Vasconcelos Corga, JB De Vivie De Regie, C Debenedetti, DV Dedovich, N Dehghanian, M Del Gaudio, 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, DA DeMarco, S Demers, M Demichev, SP Denisov, D Denysiuk, L D'Eramo, D Derendarz, JE Derkaoui, F Derue, P Dervan, K Desch, C Deterre, K Dette, MR Devesa, PO Deviveiros, A Dewhurst, S Dhaliwal, FA Di Bello, A Di Ciaccio, L Di Ciaccio, WK Di Clemente, C Di Donato, A Di Girolamo, B Di Micco, R Di Nardo, KF Di Petrillo, A Di Simone, R Di Sipio, D Di Valentino, C Diaconu, M Diamond, FA Dias, T Dias Do Vale, MA Diaz, J Dickinson, EB Diehl, J Dietrich, S Diez Cornell, A Dimitrievska, J Dingfelder, F Dittus, F Djama, T Djobava, JI Djuvsland, MAB Do Vale, M Dobre, D Dodsworth, C Doglioni, J Dolejsi, Z Dolezal, M Donadelli, J Donini, A D'onofrio, M D'Onofrio, J Dopke, A Doria, MT Dova, AT Doyle, E Drechsler, E Dreyer, T Dreyer, Y Du, J Duarte-Campderros, F Dubinin, M Dubovsky, A Dubreuil, E Duchovni, G Duckeck, A Ducourthial, OA Ducu, D Duda, A Dudarev, AC Dudder, EM Duffield, L Duflot, M Duehrssen, C Duelsen, M Dumancic, AE Dumitriu, AK Duncan, M Dunford, A Duperrin, H Duran Yildiz, M Dueren, A Durglishvili, D Duschinger, B Dutta, D Duvnjak, M Dyndal, S Dysch, BS Dziedzic, C Eckardt, KM Ecker, RC Edgar, T Eifert, G Eigen, K Einsweiler, T Ekelof, M El Kacimi, R El Kosseifi, V Ellajosyula, M Ellert, F Ellinghaus, AA Elliot, N Ellis, J Elmsheuser, M Elsing, D Emeliyanov, Y Enari, JS Ennis, MB Epland, J Erdmann, A Ereditato, S Errede, M Escalier, C Escobar, O Estrada Pastor, AI Etienvre, E Etzion, H Evans, A Ezhilov, M Ezzi, F Fabbri, L Fabbri, V Fabiani, G Facini, RM Faisca Rodrigues Pereira, RM Fakhrutdinov, S Falciano, PJ Falke, S Falke, J Faltova, Y Fang, M Fanti, A Farbin, A Farilla, EM Farina, T Farooque, S Farrell, SM Farrington, P Farthouat, F Fassi, P Fassnacht, D Fassouliotis, M Faucci Giannelli, A Favareto, WJ Fawcett, L Fayard, OL Fedin, W Fedorko, M Feickert, S Feigl, L Feligioni, C Feng, EJ Feng, M Feng, MJ Fenton, AB Fenyuk, L Feremenga, J Ferrando, A Ferrari, P Ferrari, R Ferrari, DE Ferreira de Lima, A Ferrer, D Ferrere, C Ferretti, F Fiedler, A Filipcic, F Filthaut, KD Finelli, MCN Fiolhais, L Fiorini, C Fischer, WC Fisher, N Flaschel, I Fleck, P Fleischmann, RRM Fletcher, T Flick, BM Flierl, LM Flores, LR Flores Castillo, N Fomin, GT Forcolin, A Formica, FA Forster, AC Forti, AG Foster, D Fournier, H Fox, S Fracchia, P Francavilla, M Franchini, S Franchino, D Francis, L Franconi, M Franklin, M Frate, M Fraternali, D Freeborn, SM Fressard-Batraneanu, B Freund, WS Freund, D Froidevaux, JA Frost, C Fukunaga, E Fullana Torregrosa, T Fusayasu, J Fuster, O Gabizon, A Gabrielli, GP Gach, S Gadatsch, P Gadow, G Gagliardi, LG Gagnon, C Galea, B Galhardo, EJ Gallas, BJ Gallop, P Gallus, G Galster, R Gamboa Goni, KK Gan, S Ganguly, Y Gao, YS Gao, C Garcia, JE Garcia Navarro, JA Garcia Pascual, M Garcia-Sciveres, RW Gardner, N Garelli, V Garonne, K Gasnikova, A Gaudiello, G Gaudio, IL Gavrilenko, A Gavrilyuk, C Gay, G Gaycken, EN Gazis, CNP Gee, J Geisen, M Geisen, MP Geisler, K Gellerstedt, C Gemme, MH Genest, C Geng, S Gentile, C Gentsos, S George, D Gerbaudo, G Gessner, S Ghasemi, M Ghasemi Bostanabad, M Ghneimat, B Giacobbe, S Giagu, N Giangiacomi, P Giannetti, A Giannini, SM Gibson, M Gignac, D Gillberg, G Gilles, DM Gingrich, MP Giordani, FM Giorgi, PF Giraud, P Giromini, G Giugliarelli, D Giugni, F Giuli, M Giulini, S Gkaitatzis, I Gkialas, EL Gkougkousis, P Gkountoumis, LK Gladilin, C Glasman, J Glatzer, PCF Glaysher, A Glazov, M Goblirsch-Kolb, J Godlewski, S Goldfarb, T Golling, D Golubkov, A Gomes, R Goncalves Gama, R Goncalo, G Gonella, L Gonella, A Gongadze, F Gonnella, JL Gonski, S Gonzalez de la Hoz, S Gonzalez-Sevilla, L Goossens, PA Gorbounov, HA Gordon, B Gorini, E Gorini, A Gorisek, AT Goshaw, C Goessling, MI Gostkin, CA Gottardo, CR Goudet, D Goujdami, AG Goussiou, N Govender, C Goy, E Gozani, I Grabowska-Bold, POJ Gradin, EC Graham, J Gramling, E Gramstad, S Grancagnolo, V Gratchev, PM Gravila, C Gray, HM Gray, ZD Greenwood, C Grefe, K Gregersen, IM Gregor, P Grenier, K Grevtsov, J Griffiths, AA Grillo, K Grimm, S Grinstein, Ph Gris, J-F Grivaz, S Groh, E Gross, J Grosse-Knetter, GC Grossi, ZJ Grout, C Grud, A Grummer, L Guan, W Guan, J Guenther, A Guerguichon, F Guescini, D Guest, R Gugel, B Gui, T Guillemin, S Guindon, U Gul, C Gumpert, J Guo, W Guo, Y Guo, Z Guo, R Gupta, S Gurbuz, G Gustavino, BJ Gutelman, P Gutierrez, C Gutschow, C Guyot, MP Guzik, C Gwenlan, CB Gwilliam, A Haas, C Haber, HK Hadavand, N Haddad, A Hadef, S Hageboeck, M Hagihara, H Hakobyan, M Haleem, J Haley, G Halladjian, GD Hallewell, K Hamacher, P Hamal, K Hamano, A Hamilton, GN Hamity, K Han, L Han, S Han, K Hanagaki, M Hance, DM Handl, B Haney, R Hankache, P Hanke, E Hansen, JB Hansen, JD Hansen, MC Hansen, PH Hansen, K Hara, AS Hard, T Harenberg, S Harkusha, PF Harrison, NM Hartmann, Y Hasegawa, A Hasib, S Hassani, S Haug, R Hauser, L Hauswald, LB Havener, M Havranek, CM Hawkes, RJ Hawkings, D Hayden, C Hayes, CP Hays, JM Hays, HS Hayward, SJ Haywood, MP Heath, V Hedberg, L Heelan, S Heer, KK Heidegger, J Heilman, S Heim, T Heim, B Heinemann, JJ Heinrich, L Heinrich, C Heinz, J Hejbal, L Helary, A Held, S Hellesund, S Hellman, C Helsens, RCW Henderson, Y Heng, S Henkelmann, AM Henriques Correia, GH Herbert, H Herde, V Herget, Y Hernandez Jimenez, H Herr, MG Herrmann, G Herten, R Hertenberger, L Hervas, TC Herwig, GG Hesketh, NP Hessey, JW Hetherly, S Higashino, E Higon-Rodriguez, K Hildebrand, E Hill, JC Hill, KK Hill, KH Hiller, SJ Hillier, M Hils, I Hinchliffe, M Hirose, D Hirschbuehl, B Hiti, O Hladik, DR Hlaluku, X Hoad, J Hobbs, N Hod, MC Hodgkinson, A Hoecker, MR Hoeferkamp, F Hoenig, D Hohn, D Hohov, TR Holmes, M Holzbock, M Homann, S Honda, T Honda, TM Hong, A Hoenle, BH Hooberman, WH Hopkins, Y Horii, P Horn, AJ Horton, LA Horyn, J-Y Hostachy, A Hostiuc, S Hou, A Hoummada, J Howarth, J Hoya, M Hrabovsky, J Hrdinka, I Hristova, J Hrivnac, A Hrynevich, T Hryn'ova, PJ Hsu, S-C Hsu, Q Hu, S Hu, Y Huang, Z Hubacek, F Hubaut, M Huebner, F Huegging, TB Huffman, EW Hughes, M Huhtinen, RFH Hunter, P Huo, AM Hupe, N Huseynov, J Huston, J Huth, R Hyneman, G Iacobucci, G Iakovidis, I Ibragimov, L Iconomidou-Fayard, Z Idrissi, P Iengo, R Ignazzi, O Igonkina, R Iguchi, T Iizawa, Y Ikegami, M Ikeno, D Iliadis, N Ilic, F Iltzsche, G Introzzi, M Iodice, K Iordanidou, V Ippolito, MF Isacson, N Ishijima, M Ishino, M Ishitsuka, W Islam, C Issever, S Istin, F Ito, JM Iturbe Ponce, R Iuppa, A Ivina, H Iwasaki, JM Izen, V Izzo, S Jabbar, P Jacka, P Jackson, RM Jacobs, V Jain, G Jaekel, KB Jakobi, K Jakobs, S Jakobsen, T Jakoubek, DO Jamin, DK Jana, R Jansky, J Janssen, M Janus, PA Janus, G Jarlskog, N Javadov, T Javurek, M Javurkova, F Jeanneau, L Jeanty, J Jejelava, A Jelinskas, P Jenni, J Jeong, S Jezequel, H Ji, J Jia, H Jiang, Y Jiang, Z Jiang, S Jiggins, FA Jimenez Morales, J Jimenez Pena, S Jin, A Jinaru, O Jinnouchi, H Jivan, P Johansson, KA Johns, CA Johnson, WJ Johnson, K Jon-And, RWL Jones, SD Jones, S Jones, TJ Jones, J Jongmanns, PM Jorge, J Jovicevic, X Ju, JJ Junggeburth, A Juste Rozas, A Kaczmarska, M Kado, H Kagan, M Kagan, T Kaji, E Kajomovitz, CW Kalderon, A Kaluza, S Kama, A Kamenshchikov, L Kanjir, Y Kano, VA Kantserov, J Kanzaki, B Kaplan, LS Kaplan, D Kar, MJ Kareem, E Karentzos, SN Karpov, ZM Karpova, V Kartvelishvili, AN Karyukhin, K Kasahara, L Kashif, RD Kass, A Kastanas, Y Kataoka, C Kato, J Katzy, K Kawade, K Kawagoe, T Kawamoto, G Kawamura, EF Kay, VF Kazanin, R Keeler, R Kehoe, JS Keller, E Kellermann, JJ Kempster, J Kendrick, O Kepka, S Kersten, BP Kersevan, RA Keyes, M Khader, F Khalil-Zada, A Khanov, AG Kharlamov, T Kharlamova, A Khodinov, TJ Khoo, E Khramov, J Khubua, S Kido, M Kiehn, CR Kilby, SH Kim, YK Kim, N Kimura, OM Kind, BT King, D Kirchmeier, J Kirk, AE Kiryunin, T Kishimoto, D Kisielewska, V Kitali, O Kivernyk, E Kladiva, T Klapdor-Kleingrothaus, MH Klein, M Klein, U Klein, K Kleinknecht, P Klimek, A Klimentov, R Klingenberg, T Klingl, T Klioutchnikova, FF Klitzner, P Kluit, S Kluth, E Kneringer, EBFG Knoops, A Knue, A Kobayashi, D Kobayashi, T Kobayashi, M Kobel, M Kocian, P Kodys, T Koffas, E Koffeman, NM Koehler, T Koi, M Kolb, I Koletsou, T Kondo, N Kondrashova, K Koeneke, AC Konig, T Kono, R Konoplich, V Konstantinides, N Konstantinidis, B Konya, R Kopeliansky, S Koperny, K Korcyl, K Kordas, A Korn, I Korolkov, EV Korolkova, O Kortner, S Kortner, T Kosek, VV Kostyukhin, A Kotwal, A Koulouris, A Kourkoumeli-Charalampidi, C Kourkoumelis, E Kourlitis, V Kouskoura, AB Kowalewska, R Kowalewski, TZ Kowalski, C Kozakai, W Kozanecki, AS Kozhin, VA Kramarenko, G Kramberger, D Krasnopevtsev, MW Krasny, A Krasznahorkay, D Krauss, JA Kremer, J Kretzschmar, P Krieger, K Krizka, K Kroeninger, H Kroha, J Kroll, J Krstic, U Kruchonak, H Krueger, N Krumnack, MC Kruse, T Kubota, S Kuday, JT Kuechler, S Kuehn, A Kugel, F Kuger, T Kuhl, V Kukhtin, R Kukla, Y Kulchitsky, S Kuleshov, YP Kulinich, M Kuna, T Kunigo, A Kupco, T Kupfer, O Kuprash, H Kurashige, LL Kurchaninov, YA Kurochkin, MG Kurth, ES Kuwertz, M Kuze, J Kvita, T Kwan, A La Rosa, JL La Rosa Navarro, L La Rotonda, F La Ruffa, C Lacasta, F Lacava, J Lacey, DPJ Lack, H Lacker, D Lacour, E Ladygin, R Lafaye, B Laforge, T Lagouri, S Lai, S Lammers, W Lampl, E Lancon, U Landgraf, MPJ Landon, MC Lanfermann, VS Lang, JC Lange, RJ Langenberg, AJ Lankford, F Lanni, K Lantzsch, A Lanza, A Lapertosa, S Laplace, JF Laporte, T Lari, F Lasagni Manghi, M Lassnig, TS Lau, A Laudrain, M Lavorgna, AT Law, P Laycock, M Lazzaroni, B Le, O Le Dortz, E Le Guirriec, EP Le Quilleuc, M Le Blanc, T Le Compte, F Ledroit-Guillon, CA Lee, GR Lee, L Lee, SC Lee, B Lefebvre, M Lefebvre, F Legger, C Leggett, N Lehmann, G Lehmann Miotto, WA Leight, A Leisos, MAL Leite, R Leitner, 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Searches for electroweak production of supersymmetric particles with compressed mass spectra in √s=13 TeV pp collisions with the ATLAS detector

Physical Review D: Particles, Fields, Gravitation and Cosmology American Physical Society 101:5 (2020) 052005

Authors:

Luca Ambroz, Giacomo Artoni, Moritz Backes, William Balunas, Alan Barr, Lydia Beresford, Daniela Bortoletto, Amanda Cooper-Sarkar, Foti, Joanna Frost, Gabriel Emmanuel Gallardo, Elizabeth Gallas, Claire Gwenlan, Hays, Brian Huffman, Kla Karava, Luigi Marchese, Claudia Merlassino, Koichi Nagai, Richard Nickerson, O'Neill, SR Paredes Saenz, Petrov, Elisabeth Schopf, Sharma, Shipsey, Beojan Stanislaus, Migle Stankaityte, Cecilia Tosciri, Tseng, Georg Viehhauser, Anthony Weidberg, Wölker, Gabija Zemaityte, Zgubič

Abstract:

This paper presents results of searches for the electroweak production of supersymmetric particles in models with compressed mass spectra. The searches use 139 fb⁻¹ of √s = 13 TeV proton-proton collision data collected by the ATLAS experiment at the Large Hadron Collider. Events with missing transverse momentum and two same-flavor, oppositely charged, low-transverse-momentum leptons are selected, and are further categorized by the presence of hadronic activity from initial-state radiation or a topology compatible with vector-boson fusion processes. The data are found to be consistent with predictions from the Standard Model. The results are interpreted using simplified models of R-parity-conserving supersymmetry in which the lightest supersymmetric partner is a neutralino with a mass similar to the lightest chargino, the second-to-lightest neutralino, or the slepton. Lower limits on the masses of charginos in different simplified models range from 193 to 240 GeV for moderate mass splittings, and extend down to mass splittings of 1.5 to 2.4 GeV at the LEP chargino bounds (92.4 GeV). Similar lower limits on degenerate light-flavor sleptons extend up to masses of 251 GeV and down to mass splittings of 550 MeV. Constraints on vector-boson fusion production of electroweak SUSY states are also presented.
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Measurement of VH, H -> b(b)over-bar production as a function of the vector-boson transverse momentum in 13 TeV pp collisions with the ATLAS detector

Journal of High Energy Physics Springer 2019:5 (2019) 141

Authors:

Daniela Bortoletto, M Aaboud, G Aad, B Abbott, Luca Ambroz, Giacomo Artoni, William K Balunas, Alan J Barr, Lydia Beresford, Amanda M Cooper-Sarkar, James A Frost, Elizabeth J Gallas, Francesco Giuli, Claire Gwenlan, Christopher P Hays, T Brian Huffman, Cigdem Issever, Jesse Kar Kee Liu, Luigi Marchese, Koichi Nagai, Micheal E Nelson, Richard Nickerson, Santiago R Paredes Saenz, Elisabeth Schopf, Abhishek Sharma, Ian PJ Shipsey, Beojan Stanislaus, Migle Stankaityte, Cecilia Tosciri, Jeffrey C-L Tseng, Georg HA Viehhauser, AR Weidberg, Ricardo Wölker, Gabija Zemaityte, Miha Zgubič, The ATLAS collaboration

Abstract:

Cross-sections of associated production of a Higgs boson decaying into bottomquark pairs and an electroweak gauge boson, W or Z, decaying into leptons are measured as a function of the gauge boson transverse momentum. The measurements are performed in kinematic fiducial volumes defined in the ‘simplified template cross-section’ framework. The results are obtained using 79.8 fb−1 of proton-proton collisions recorded by the ATLAS detector at the Large Hadron Collider at a centre-of-mass energy of 13 TeV. All measurements are found to be in agreement with the Standard Model predictions, and limits are set on the parameters of an effective Lagrangian sensitive to modifications of the Higgs boson couplings to the electroweak gauge bosons.
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