Search for dark photons from Higgs boson decays in the gluon-gluon fusion channel in proton-proton collisions at $\sqrt{s}=13.6$ TeV with the ATLAS detector

ArXiv 2606.14362 (2026)

Search for higgsinos in compressed mass spectra using low-momentum tracks in pp collisions at s = 13 TeV with the ATLAS detector

Journal of High Energy Physics Springer 2026:6 (2026) 94

Authors:

G Aad, E Aakvaag, B Abbott, S Abdelhameed, K Abeling, NJ Abicht, SH Abidi, M Aboelela, A Aboulhorma, H Abramowicz, Y Abulaiti, BS Acharya, A Ackermann, C Adam Bourdarios, L Adamczyk, SV Addepalli, MJ Addison, J Adelman, A Adiguzel, T Adye, AA Affolder, Y Afik, MN Agaras, A Aggarwal, C Agheorghiesei

Abstract:

This paper presents two searches for the electroweak production of higgsinos with compressed mass spectra using 140 fb−1 of s=13 TeV proton-proton collision data collected by the ATLAS experiment at the Large Hadron Collider. Events are required to feature an energetic jet, large missing transverse momentum, and at least one low-momentum charged particle that serves as a candidate higgsino decay product. In the first search, targeting higgsino mass splittings in the range of 0.3–1 GeV, the higgsinos are expected to predominantly decay into pions that are identified as low-momentum charged particles with large transverse impact parameters due to the long higgsino lifetime (cτ ≈ đ’Ș(0.1–10 mm)), and neural networks are used to discriminate between signal and background processes. The second search targets larger mass splittings in the range of 1–3 GeV, where the higgsinos are expected to decay promptly into low-momentum leptons, one of which is identified by dedicated low-momentum electron or muon taggers based on neural networks utilising tracking and calorimeter information. No significant excess above the Standard Model prediction is observed in either search and the results are interpreted within simplified models, to set lower limits on the masses of the higgsino-like charginos and neutralinos. Together, these searches exclude chargino masses below 126 GeV at 95% confidence level for mass splittings between the chargino and lightest neutralino in the range of 0.3–2 GeV. This represents the first ATLAS constraints in a portion of this parameter space and surpasses the limits previously set by other experiments.

Probing the Higgs-top Yukawa interaction in the $t\bar{t}H$ and $tH$ processes using $H\rightarrowγγ$ with the ATLAS detector

ArXiv 2606.04855 (2026)

Search for electroweak scale dijet resonances in pile-up collisions at $\sqrt{s}=13$ TeV with the ATLAS detector

ArXiv 2606.03222 (2026)

Combined effective field theory interpretation of measurements sensitive to quartic gauge boson couplings in pp collisions at s = 13 TeV with the ATLAS detector

Physics Letters B (2026) 140683

Authors:

G Aad, E Aakvaag, B Abbott, S Abdelhameed, K Abeling, NJ Abicht, SH Abidi, M Aboelela, A Aboulhorma, H Abramowicz, BS Acharya, A Ackermann, C Adam Bourdarios, L Adamczyk, SV Addepalli, MJ Addison, J Adelman, A Adiguzel, T Adye, AA Affolder, Y Afik, MN Agaras, A Aggarwal, C Agheorghiesei, A Ahmad, F Ahmadov, S Ahuja, S Ahuja, X Ai, G Aielli, A Aikot, M Ait Tamlihat, TPA Åkesson, D Akiyama, NN Akolkar, S Aktas, GL Alberghi, J Albert, U Alberti, P Albicocco, S Alderweireldt, ZL Alegria, M Aleksa, IN Aleksandrov, C Alexa, T Alexopoulos, F Alfonsi, M Algren, M Alhroob, B Ali, HMJ Ali, S Ali, SW Alibocus, M Aliev, G Alimonti, C Allaire, BMM Allbrooke, DR Allen, JS Allen, JF Allen, CS Alley, ER Almazan, A Aloisio, F Alonso, C Alpigiani, A Alvarez Fernandez, M Alves Cardoso, MG Alviggi, M Aly, Y Amaral Coutinho, C Amelung, M Amerl, T Amezza, B Amini, K Amirie, A Amirkhanov, D Amperiadou, S An, C Anastopoulos, T Andeen, JK Anders, AC Anderson, A Andreazza, S Angelidakis, A Angerami, AV Anisenkov, A Annovi, C Antel, E Antipov, M Antonelli, F Anulli, M Aoki, T Aoki, MA Aparo, L Aperio Bella, M Apicella, C Appelt, A Apyan, M Arampatzi, SJ Arbiol Val, C Arcangeletti, ATH Arce, M Arcuri, J-F Arguin, S Argyropoulos, J-H Arling, O Arnaez, H Arnold, G Artoni, H Asada, S Asatryan, NA Asbah, RA Ashby Pickering, AM Aslam, J Assahsah, K Assamagan, R Astalos, KSV Astrand, S Atashi, RJ Atkin, H Atmani, PA Atmasiddha, K Augsten, AD Auriol, VA Austrup, AS Avad, G Avolio, A Azzam, D Babal, H Bachacou, K Bachas, A Bachiu, E Bachmann, MJ Backes, A Badea, TM Baer, M Bahmani, D Bahner, K Bai, L Baines, OK Baker, D Bakshi Gupta, LE Balabram Filho, V Balakrishnan, R Balasubramanian, P Balek, E Ballabene, F Balli, LM Baltes, WK Balunas, I Bamwidhi, E Banas, M Bandieramonte, A Bandyopadhyay, S Bansal, L Barak, M Barakat, EL Barberio, D Barberis, M Barbero, MZ Barel, T Barillari, M-S Barisits, T Barklow, P Baron, DA Baron Moreno, A Baroncelli, AJ Barr, JD Barr, F Barreiro, J Barreiro GuimarĂŁes da Costa, MG Barros Teixeira, F Bartels, R Bartoldus, AE Barton, P Bartos, M Baselga, S Bashiri, A Bassalat, MJ Basso, S Bataju, R Bate, RL Bates, S Batlamous, M Battaglia, D Battulga, M Bauce, L Bauckhage, P Bauer, LT Bayer, LT Bazzano Hurrell, T Beau, JY Beaucamp, S Beauceron, PH Beauchemin, P Bechtle, HP Beck, K Becker, AJ Beddall, VA Bednyakov, CP Bee, LJ Beemster, M Begalli, M Begel, JK Behr, JF Beirer, F Beisiegel, M Belfkir, G Bella, L Bellagamba, A Bellerive, CD Bellgraph, P Bellos, I Benaoumeur, D Benchekroun, F Bendebba, Y Benhammou, KC Benkendorfer, L Beresford, M Beretta, E Bergeaas Kuutmann, N Berger, B Bergmann, J Beringer, M Berkat, G Bernardi, C Bernius, FU Bernlochner, A Berrocal Guardia, T Berry, P Berta, A Berti, R Bertrand, S Bethke, A Betti, TF Beumker, AJ Bevan, L Bezio, NK Bhalla, S Bharthuar, S Bhatta, P Bhattarai, ZM Bhatti, KD Bhide, VS Bhopatkar, RM Bianchi, G Bianco, O Biebel, M Biglietti, P Bijl, CS Billingsley, Y Bimgdi, M Bindi, A Bingham, A Bingul, C Bini, GA Bird, M Biros, S Biryukov, T Bisanz, E Bisceglie, JP Biswal, D Biswas, M Biyabi, I Bloch, A Blue, U Blumenschein, VS Bobrovnikov, L Boccardo, M Boehler, B Boehm, D Bogavac, LS Boggia, V Boisvert, P Bokan, T Bold, M Bomben, M Bona, M Boonekamp, AG BorbĂ©ly, G Borissov, A Borkar, D Bortoletto, M Borysova, D Boscherini, M Bosman, K Bouaouda, L Boudet, J Boudreau, EV Bouhova-Thacker, D Boumediene, R Bouquet, A Boveia, D Boye, IR Boyko, L Bozianu, J Bracinik, N Brahimi, G Brandt, O Brandt, B Brau, R Brener, L Brenner, R Brenner, S Bressler, M Brettell, G Brianti, D Britton, D Britzger, I Brock, R Brock, H Bronson, G Brooijmans, AJ Brooks, EM Brooks, E Brost, LM Brown, LE Bruce, TL Bruckler, PA Bruckman de Renstrom, B BrĂŒers, A Bruni, G Bruni, D Brunner, M Bruschi, N Bruscino, T Buanes, Q Buat, D Buchin, AG Buckley, J Bucko, M Buhring, O Bulekov, BA Bullard, TO Buratovich, S Burdin, CD Burgard, AM Burger, B Burghgrave, O Burlayenko, J Burleson, JC Burzynski, V BĂŒscher, PJ Bussey, O But, JM Butler, CM Buttar, JM Butterworth, P Butti, W Buttinger, CJ Buxo Vazquez, AR Buzykaev, S Cabrera UrbĂĄn, L Cadamuro, H Cai, Y Cai, Y Cai, MA Cairo, VMM Cairo, O Cakir, N Calace, P Calafiura, G Calderini, P Calfayan, L Calic, G Callea, LP Caloba, D Calvet, S Calvet, R Camacho Toro, S Camarda, D Camarero Munoz, P Camarri, C Camincher, M Campanelli, A Camplani, V Canale, AC Canbay, E Canonero, J Cantero, F Capocasa, P Cappelli, M Capua, A Carbone, R Cardarelli, JCJ Cardenas, MP Cardiff, G Carducci, T Carli, G Carlino, JI Carlotto, BT Carlson, EM Carlson, L Carminati, A Carnelli, M Carnesale, S Caron, E Carquin, IB Carr, S CarrĂĄ, G Carratta, C Carrion Martinez, AM Carroll, N Cartalade, MP Casado, P Casolaro, M Caspar, F Cassinese, WR Castiglioni, FL Castillo, V Castillo Gimenez, NF Castro, A Catinaccio, JR Catmore, T Cavaliere, V Cavaliere, E Celebi, S Cella, V Cepaitis, K Cerny, AS Cerqueira, A Cerri, L Cerrito, F Cerutti, B Cervato, A Cervelli, G Cesarini, SA Cetin, VC Chabalala, PM Chabrillat, R Chakkappai, S Chakraborty, A Chambers, J Chan, JD Chapman, E Chapon, DG Charlton, C Chauhan, Y Che, S Chekanov, GA Chelkov, H Chen, J Chen, J Chen, M Chen, S Chen, SJ Chen, X Chen, X Chen, Z Chen, CL Cheng, HC Cheng, S Cheong, A Cheplakov, E Cherepanova, E Cheu, K Cheung, L Chevalier, G Chiarelli, G Chiodini, AS Chisholm, JL Chisholm, A Chitan, M Chitishvili, MV Chizhov, K Choi, Y Chou, EYS Chow, G Christou, KL Chu, MC Chu, Z Chubinidze, J Chudoba, JJ Chwastowski, D Cieri, KM Ciesla, V Cindro, A Ciocio, F Cirotto, ZH Citron, M Citterio, DA Ciubotaru, A Clark, PJ Clark, N Clarke Hall, C Clarry, SE Clawson, C Clement, L Clissa, Y Coadou, M Cobal, A Coccaro, MG Cochran Branson, RF Coelho Barrue, R Coelho Lopes De, S Coelli, MM Cohen, LS Colangeli, B Cole, P Collado Soto, J Collot, MR Coluccia, I Combes, P Conde Muiño, LHJ Condren, MP Connell, SH Connell, EI Conroy, M Contreras Cossio, F Conventi, AM Cooper-Sarkar Sarkar, L Corazzina, FA Corchia, A Cordeiro Oudot Choi, LD Corpe, M Corradi, F Corriveau, A Cortes-Gonzalez, MJ Costa, F Costanza, D Costanzo, J Couthures, G Cowan, K Cranmer, L Cremer, D Cremonini, S CrĂ©pĂ©-Renaudin, F Crescioli, T Cresta, M Cristinziani, M Cristoforetti, TM Critchley, E Critelli, A Cueto, H Cui, Z Cui, BM Cunnett, WR Cunningham, E Cuppini, F Curcio, JR Curran, MJ Da Cunha Sargedas De Sousa, JV Da Fonseca Pinto, C Da Via, W Dabrowski, T Dado, S Dahbi, T Dai, D Dal Santo, C Dallapiccola, M Dam, G D’amen, V D’Amico, JR Dandoy, M D’Andrea, D Dannheim, G D’anniballe, M Danninger, V Dao, G Darbo, F Dattola, S D’Auria, A D’Avanzo, T Davidek, J Davidson, I Dawson, K De, C De Almeida Rossi, N De Biase, S De Castro, N De Groot, P de Jong, H De la Torre, A De Maria, S De Miranda Rimes, A De Salvo, U De Sanctis, F De Santis, A De Santo, JB De Vivie De Regie, KG De Vries, J Debevc, DV Dedovich, J Degens, AM Deiana, J Del Peso, L Delagrange, F Deliot, CM Delitzsch, M Della Pietra, D Della Volpe, A Dell’Acqua, L Dell’Asta, M Delmastro, CC Delogu, PA Delsart, S Demers, M Demichev, H Denizli, MG Depala, L D’Eramo, D Derendarz, L Derin, F Derue, P Dervan, AM Desai, K Desch, FA Di Bello, A Di Ciaccio, L Di Ciaccio, D Di Croce, C Di Donato, A Di Girolamo, G Di Gregorio, A Di Luca, B Di Micco, R Di Nardo, KF Di Petrillo, M Diamantopoulou, FA Dias, MA Diaz, AR Didenko, M Didenko, SD Diefenbacher, EB Diehl, S DĂ­ez Cornell, C Diez Pardos, C Dimitriadi, A Dimitrievska, A Dimri, Y Ding, J Dingfelder, T Dingley, I-M Dinu, SJ Dittmeier, F Dittus, M Divisek, B Dixit, F Djama, T Djobava, C Doglioni, A Dohnalova, Z Dolezal, K Domijan, KM Dona, M Donadelli, B Dong, J Donini, A D’Onofrio, M D’Onofrio, J Dopke, A Doria, N Dos Santos Fernandes, IA Dos Santos Luz, P Dougan, MT Dova, AT Doyle, MP Drescher, E Dreyer, I Drivas-koulouris, M Drnevich, D Du, T Du, TA du Pree, Z Duan, M Dubau, F Dubinin, M Dubovsky, E Duchovni, G Duckeck, PK Duckett, OA Ducu, D Duda, A Dudarev, MM Dudek, ER Duden, M D’uffizi, L Duflot, M DĂŒhrssen, I Duminica, AE Dumitriu, M Dunford, T Duong, A Duperrin, AF Duque Bran, H Duran Yildiz, A Durglishvili, GI Dyckes, M Dyndal, BS Dziedzic, GH Eberwein, B Eckerova, JC Egan, S Eggebrecht, E Egidio Purcino De Souza, G Eigen, K Einsweiler, T Ekelof, PA Ekman, S El Farkh, Y El Ghazali, H El Jarrari, A El Moussaouy, I Elbaz, D Elitez, M Ellert, F Ellinghaus, TA Elliot, J Elmsheuser, M Elsawy, M Elsing, D Emeliyanov, Y Enari, S Epari, D Ernani Martins Neto, F Ernst, M Escalier, C Escobar, R Estevam De Paula, E Etzion, G Evans, H Evans, LS Evans, S Ezzarqtouni, F Fabbri, L Fabbri, G Facini, V Fadeyev, D Fakoudis, S Falciano, LF Falda Ulhoa Coelho, F Fallavollita, G Falsetti, J Faltova, C Fan, KY Fan, Y Fan, Y Fang, M Fanti, M Faraj, Z Farazpay, A Farbin, A Farilla, K Farman, JN Farr, MS Farrington, SM Farrington, F Fassi, D Fassouliotis, L Fayard, G Fazzino, P Federic, P Federicova, M Feickert, L Feligioni, DE Fellers, C Feng, Y Feng, Z Feng, B Fernandez Barbadillo, P Fernandez Martinez, C Fernandez Ruiz, J Ferrando, A Ferrari, P Ferrari, R Ferrari, D Ferrere, C Ferretti, MP Fewell, D Fiacco, F Fiedler, P Fiedler, S Filimonov, MS Filip, A Filipčič, EK Filmer, F Filthaut, MCN Fiolhais, L Fiorini, WC Fisher, T Fitschen, I Fleck, P Fleischmann, T Flick, M Flores, LR Flores Castillo, M Foll, FM Follega, N Fomin, JH Foo, A Formica, M Fornasiero, AC Forti, N Forti, E Fortin, AW Fortman, L Foster, L Fountas, H Fox, P Francavilla, S Francescato, S Franchellucci, M Franchini, S Franchino, D Francis, L Franco, L Franconi, M Franklin, G Frattari, YY Frid, N Fritzsche, A Froch, D Froidevaux, JA Frost, Y Fu, S Fuenzalida Garrido, YC Fujikake, M Fujimoto, KY Fung, E Furtado De Simas Filho, M Furukawa, M Fuste Costa, P Fuste Martin, J Fuster, A Gaa, A Gabrielli, A Gabrielli, G Gagliardi, LG Gagnon, S Galantzan, J Gallagher, EJ Gallas, AL Gallen, BJ Gallop, KK Gan, Y Gao, Z Gao, A Garabaglu, FM Garay Walls, C GarcĂ­a, A Garcia Alonso, AG Garcia Caffaro, JE GarcĂ­a Navarro, MA Garcia Ruiz, M Garcia-Sciveres, GL Gardner, RW Gardner, N Garelli, RB Garg, JM Gargan, CA Garner, CM Garvey, VK Gassmann, G Gaudio, AJ Gavin, J Gavranovic, IL Gavrilenko, C Gay, G Gaycken, A Gekow, C Gemme, MH Genest, AD Gentry, S George, T Geralis, AA Gerwin, P Gessinger-Befurt, M Ghani, K Ghorbanian, A Ghosal, A Ghosh, A Ghosh, B Giacobbe, S Giagu, A Giannini, SM Gibson, DT Gil, BJ Gilbert, D Gillberg, G Gilles, DM Gingrich, MP Giordani, PF Giraud, G Giugliarelli, D Giugni, F Giuli, I Gkialas, BC Gladwyn, C Glasman, M Glazewska, RM Gleason, G GlemĆŸa, I Gnesi, Y Go, M Goblirsch-Kolb, B Gocke, D Godin, B Gokturk, S Goldfarb, T Golling, MGD Gololo, A Golub, JP Gombas, A Gomes, G Gomes Da Silva, AJ Gomez Delegido, R Gonçalo, A Gongadze, F Gonnella, JL Gonski, RY GonzĂĄlez Andana, S GonzĂĄlez de la Hoz, L Gonzalez Escudero, MV Gonzalez Rodrigues, R Gonzalez Suarez, S Gonzalez-Sevilla, L Goossens, B Gorini, E Gorini, A GoriĆĄek, TC Gosart, AT Goshaw, MI Gostkin, S Goswami, CA Gottardo, SA Gotz, M Gouighri, AG Goussiou, N Govender, RP Grabarczyk, I Grabowska-Bold, K Graham, E Gramstad, S Grancagnolo, CM Grant, PM Gravila, FG Gravili, HM Gray, M Greco, MJ Green, C Grefe, AS Grefsrud, IM Gregor, KT Greif, P Grenier, SG Grewe, K Grimm, S Grinstein, J-F Grivaz, E Gross, J Grosse-Knetter, LH Grossman, L Guan, G Guerrieri, R Guevara, R Gugel, JAM Guhit, A Guida, E Guilloton, S Guindon, F Guo, J Guo, L Guo, L Guo, Y Guo, Y Guo, A Gupta, R Gupta, S Gupta, S Gurbuz, SS Gurdasani, G Gustavino, P Gutierrez, LF Gutierrez Zagazeta, M Gutsche, C Gutschow, W GuĂ©rin, C Gwenlan, CB Gwilliam, ES Haaland, A Haas, M Habedank, C Haber, RJ Haberle, HK Hadavand, A Haddad, A Hadef, AI Hagan, JJ Hahn, M Haleem, J Haley, GD Hallewell, JA Hallford, K Hamano, H Hamdaoui, M Hamer, SED Hammoud, EJ Hampshire, L Han, L Han, S Han, K Hanagaki, M Hance, DA Hangal, H Hanif, MD Hank, JB Hansen, PH Hansen, T Harenberg, S Harkusha, ML Harris, YT Harris, J Harrison, PF Harrison, MLE Hart, NM Hartman, NM Hartmann, RZ Hasan, Y Hasegawa, D Hashimoto, F Haslbeck, S Hassan, R Hauser, M Haviernik, CM Hawkes, RJ Hawkings, Y Hayashi, D Hayden, RL Hayes, CP Hays, JM Hays, HS Hayward, M He, Y He, Y He, NB Heatley, V Hedberg, J Heilman, S Heim, T Heim, JJ Heinrich, L Heinrich, J Hejbal, M Helbig, A Held, S Hellesund, CM Helling, FNE Henry, H Herde, Y HernĂĄndez JimĂ©nez, G Herten, R Hertenberger, L Hervas, ME Hesping, NP Hessey, J Hessler, R Hicks, M Hidaoui, N Hidic, E Hill, TS Hillersoy, SJ Hillier, JR Hinds, F Hinterkeuser, M Hirose, S Hirose, D Hirschbuehl, B Hiti, J Hobbs, R Hobincu, N Hod, AM Hodges, MC Hodgkinson, BH Hodkinson, A Hoecker, DD Hofer, J Hofer, J Hofner, M Holzbock, LBAH Hommels, V Homsak, JJ Hong, TM Hong, BH Hooberman, WH Hopkins, MC Hoppesch, Y Horii, ME Horstmann, MM Horzela, S Hou, MR Housenga, J Howarth, J Hoya, M Hrabovsky, T Hryn’ova, PJ Hsu, S-C Hsu, T Hsu, M Hu, P Hu, Q Hu, S Huang, X Huang, Y Huang, Y Huang, Y Huang, Z Huang, Z Hubacek, F Huegging, TB Huffman, M 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Abstract:

A combination of measurements sensitive to anomalous quartic electroweak gauge boson couplings is presented using proton–proton collision data collected by the ATLAS detector at s = 13 TeV at the LHC. Contributing analyses include measurements of vector-boson scattering in numerous final states as well as a tri-boson measurement. The combined measurement is used to constrain anomalous electroweak boson quartic self-couplings that result from dimension-8 operators in the Éboli model using an effective field theory. Results are presented as 68% and 95% confidence level intervals parameterised by one or two Wilson coefficients, both with and without unitarity constraints applied. Theoretical bounds from unitarity and positivity are overlaid where relevant. Confidence intervals obtained from simultaneous profiled fits to all Wilson coefficients are also presented.