Prompt Searches for Very-high-energy γ -Ray Counterparts to IceCube Astrophysical Neutrino Alerts

The Astrophysical Journal American Astronomical Society 997:2 (2026) 141

Authors:

J Abhir, A Biland, K Brand, T Bretz, D Dorner, L Eisenberger, D Elsaesser, P Günther, S Hasan, D Hildebrand, K Mannheim, M Linhoff, F Pfeifle, W Rhode, B Schleicher, V Sliusar, M Vorbrugg, R Walter, F Aharonian, F Ait Benkhali, J Aschersleben, H Ashkar, M Backes, A Brown, G Cotter

Abstract:

The search for sources of high-energy astrophysical neutrinos can be significantly advanced through a multimessenger approach, which seeks to detect the γ-rays that accompany neutrinos as they are produced at their sources. Multimessenger observations have so far provided the first evidence for a neutrino source, illustrated by the joint detection of the flaring blazar TXS 0506+056 in high-energy (E > 1 GeV) and very-high-energy (VHE; E > 100 GeV) γ-rays in coincidence with the high-energy neutrino IceCube-170922A, identified by IceCube. Imaging atmospheric Cherenkov telescopes (IACTs), namely FACT, H.E.S.S., MAGIC, and VERITAS, continue to conduct extensive neutrino target-of-opportunity follow-up programs. These programs have two components: follow-up observations of single astrophysical neutrino candidate events (such as IceCube-170922A), and observation of known γ-ray sources after the identification of a cluster of neutrino events by IceCube. Here we present a comprehensive analysis of follow-up observations of high-energy neutrino events observed by the four IACTs between 2017 September (after the IceCube-170922A event) and 2021 January. Our study found no associations between γ-ray sources and the observed neutrino events. We provide a detailed overview of each neutrino event and its potential counterparts. Furthermore, a joint analysis of all IACT data is included, yielding combined upper limits on the VHE γ-ray flux.

Deep Search for Joint Sources of Gravitational Waves and High-Energy Neutrinos with IceCube During the Third Observing Run of LIGO and Virgo

ArXiv 2601.07595 (2026)

Authors:

The IceCube Collaboration, R Abbasi, M Ackermann, J Adams, SK Agarwalla, JA Aguilar, M Ahlers, JM Alameddine, S Ali, NM Amin, K Andeen, C Argüelles, Y Ashida, S Athanasiadou, SN Axani, R Babu, X Bai, J Baines-Holmes, A Balagopal V, SW Barwick, S Bash, V Basu, R Bay, JJ Beatty, J Becker Tjus, P Behrens, J Beise, C Bellenghi, S Benkel, S BenZvi, D Berley, E Bernardini, DZ Besson, E Blaufuss, L Bloom, S Blot, I Bodo, F Bontempo, JY Book Motzkin, C Boscolo Meneguolo, S Böser, O Botner, J Böttcher, J Braun, B Brinson, Z Brisson-Tsavoussis, RT Burley, D Butterfield, MA Campana, K Carloni, J Carpio, S Chattopadhyay, N Chau, Z Chen, D Chirkin, S Choi, BA Clark, A Coleman, P Coleman, GH Collin, DA Coloma Borja, A Connolly, JM Conrad, ST Countryman, DF Cowen, C De Clercq, JJ DeLaunay, D Delgado, T Delmeulle, S Deng, P Desiati, KD de Vries, G de Wasseige, T DeYoung, JC Díaz-Vélez, S DiKerby, T Ding, M Dittmer, A Domi, L Draper, L Dueser, D Durnford, K Dutta, MA DuVernois, T Ehrhardt, L Eidenschink, A Eimer, C Eldridge, P Eller, E Ellinger, D Elsässer, R Engel, H Erpenbeck, W Esmail, S Eulig, J Evans, PA Evenson, KL Fan, K Fang, K Farrag, AR Fazely, A Fedynitch, N Feigl, C Finley, L Fischer, D Fox, A Franckowiak, S Fukami, P Fürst, J Gallagher, E Ganster, A Garcia, M Garcia, G Garg, E Genton, L Gerhardt, A Ghadimi, C Glaser, T Glüsenkamp, JG Gonzalez, S Goswami, A Granados, D Grant, SJ Gray, S Griffin, S Griswold, KM Groth, D Guevel, C Günther, P Gutjahr, C Ha, C Haack, A Hallgren, L Halve, F Halzen, L Hamacher, M Ha Minh, M Handt, K Hanson, J Hardin, AA Harnisch, P Hatch, A Haungs, J Häußler, K Helbing, J Hellrung, B Henke, L Hennig, F Henningsen, L Heuermann, R Hewett, N Heyer, S Hickford, A Hidvegi, C Hill, GC Hill, R Hmaid, KD Hoffman, D Hooper, S Hori, K Hoshina, M Hostert, W Hou, M Hrywniak, T Huber, K Hultqvist, K Hymon, A Ishihara, W Iwakiri, M Jacquart, S Jain, O Janik, M Jansson, M Jeong, M Jin, N Kamp, D Kang, W Kang, A Kappes, L Kardum, T Karg, M Karl, A Karle, A Katil, M Kauer, JL Kelley, M Khanal, A Khatee Zathul, A Kheirandish, H Kimku, J Kiryluk, C Klein, SR Klein, Y Kobayashi, A Kochocki, R Koirala, H Kolanoski, T Kontrimas, L Köpke, C Kopper, DJ Koskinen, P Koundal, M Kowalski, T Kozynets, A Kravka, N Krieger, J Krishnamoorthi, T Krishnan, K Kruiswijk, E Krupczak, A Kumar, E Kun, N Kurahashi, N Lad, C Lagunas Gualda, L Lallement Arnaud, MJ Larson, F Lauber, JP Lazar, K Leonard DeHolton, A Leszczyńska, C Li, J Liao, C Lin, QR Liu, YT Liu, M Liubarska, C Love, L Lu, F Lucarelli, W Luszczak, Y Lyu, M Macdonald, J Madsen, E Magnus, Y Makino, E Manao, S Mancina, A Mand, IC Mariş, S Marka, Z Marka, L Marten, I Martinez-Soler, R Maruyama, J Mauro, F Mayhew, F McNally, K Meagher, S Mechbal, A Medina, M Meier, Y Merckx, L Merten, J Mitchell, L Molchany, S Mondal, T Montaruli, RW Moore, Y Morii, A Mosbrugger, M Moulai, D Mousadi, E Moyaux, T Mukherjee, R Naab, M Nakos, U Naumann, J Necker, L Neste, M Neumann, H Niederhausen, MU Nisa, K Noda, A Noell, A Novikov, A Obertacke, V O'Dell, A Olivas, AS Oliveira, R Orsoe, J Osborn, E O'Sullivan, V Palusova, H Pandya, A Parenti, N Park, V Parrish, EN Paudel, L Paul, C Pérez de los Heros, T Pernice, TC Petersen, J Peterson, M Plum, A Pontén, V Poojyam, Y Popovych, M Prado Rodriguez, B Pries, R Procter-Murphy, GT Przybylski, L Pyras, C Raab, J Rack-Helleis, N Rad, M Ravn, K Rawlins, Z Rechav, A Rehman, I Reistroffer, E Resconi, S Reusch, CD Rho, W Rhode, L Ricca, B Riedel, A Rifaie, EJ Roberts, M Rongen, A Rosted, C Rott, T Ruhe, L Ruohan, D Ryckbosch, J Saffer, D Salazar-Gallegos, P Sampathkumar, A Sandrock, G Sanger-Johnson, M Santander, S Sarkar, M Scarnera, P Schaile, M Schaufel, H Schieler, S Schindler, L Schlickmann, B Schlüter, F Schlüter, N Schmeisser, T Schmidt, FG Schröder, L Schumacher, S Schwirn, S Sclafani, D Seckel, L Seen, M Seikh, S Seunarine, PA Sevle Myhr, R Shah, S Shah, S Shefali, N Shimizu, B Skrzypek, R Snihur, J Soedingrekso, D Soldin, P Soldin, G Sommani, C Spannfellner, GM Spiczak, C Spiering, J Stachurska, M Stamatikos, T Stanev, T Stezelberger, T Stürwald, T Stuttard, GW Sullivan, I Taboada, S Ter-Antonyan, A Terliuk, A Thakuri, M Thiesmeyer, WG Thompson, J Thwaites, S Tilav, K Tollefson, S Toscano, D Tosi, A Trettin, AK Upadhyay, K Upshaw, A Vaidyanathan, N Valtonen-Mattila, J Valverde, J Vandenbroucke, T Van Eeden, N van Eijndhoven, L Van Rootselaar, J van Santen, J Vara, F Varsi, M Venugopal, M Vereecken, S Vergara Carrasco, S Verpoest, D Veske, A Vijai, J Villarreal, C Walck, A Wang, EHS Warrick, C Weaver, P Weigel, A Weindl, J Weldert, AY Wen, C Wendt, J Werthebach, M Weyrauch, N Whitehorn, CH Wiebusch, DR Williams, L Witthaus, M Wolf, G Wrede, XW Xu, JP Yanez, F Yang, Y Yao, E Yildizci, S Yoshida, R Young, F Yu, S Yu, T Yuan, S Yun-Cárcamo, A Zander Jurowitzki, A Zegarelli, AC Zhang, S Zhang, Z Zhang, P Zhelnin, P Zilberman, The LIGO Scientific Collaboration, the Virgo Collaboration, the KAGRA Collaboration, AG Abac, R 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M Barsuglia, D Barta, AM Bartoletti, MA Barton, I Bartos, S Basak, A Basalaev, R Bassiri, A Basti, DE Bates, M Bawaj, P Baxi, JC Bayley, AC Baylor, PA Baynard, M Bazzan, VM Bedakihale, F Beirnaert, M Bejger, D Belardinelli, AS Bell, V Benedetto, W Benoit, JD Bentley, M Ben Yaala, S Bera, M Berbel, F Bergamin, BK Berger, S Bernuzzi, M Beroiz, CPL Berry, D Bersanetti, A Bertolini, J Betzwieser, D Beveridge, N Bevins, R Bhandare, U Bhardwaj, R Bhatt, D Bhattacharjee, S Bhaumik, S Bhowmick, A Bianchi, IA Bilenko, G Billingsley, A Binetti, S Bini, O Birnholtz, S Biscoveanu, A Bisht, M Bitossi, M-A Bizouard, JK Blackburn, LA Blagg, CD Blair, DG Blair, F Bobba, N Bode, G Boileau, M Boldrini, GN Bolingbroke, A Bolliand, LD Bonavena, R Bondarescu, F Bondu, E Bonilla, MS Bonilla, A Bonino, R Bonnand, P Booker, A Borchers, V Boschi, S Bose, V Bossilkov, V Boudart, A Boudon, A Bozzi, C Bradaschia, PR Brady, M Braglia, A Branch, M Branchesi, J Brandt, I Braun, M Breschi, T Briant, A Brillet, M Brinkmann, P Brockill, E Brockmueller, AF Brooks, BC Brown, DD Brown, ML Brozzetti, S Brunett, G Bruno, R Bruntz, J Bryant, F Bucci, J Buchanan, O Bulashenko, T Bulik, HJ Bulten, A Buonanno, K Burtnyk, R Buscicchio, D Buskulic, C Buy, RL Byer, GS Cabourn Davies, G Cabras, R Cabrita, V Cáceres-Barbosa, L Cadonati, G Cagnoli, C Cahillane, J Calderón Bustillo, TA Callister, E Calloni, JB Camp, G Caneva Santoro, KC Cannon, H Cao, LA Capistran, E Capocasa, E Capote, G Carapella, F Carbognani, M Carlassara, JB Carlin, M Carpinelli, G Carrillo, JJ Carter, G Carullo, J Casanueva Diaz, C Casentini, SY Castro-Lucas, S Caudill, M Cavaglià, R Cavalieri, G Cella, P Cerdá-Durán, W Chaibi, P Chakraborty, S Chalathadka Subrahmanya, JCL Chan, M Chan, K Chandra, R-J Chang, S Chao, EL Charlton, P Charlton, E Chassande-Mottin, C Chatterjee, Debarati Chatterjee, Deep Chatterjee, M Chaturvedi, S Chaty, A Chen, AH-Y Chen, D Chen, H Chen, HY Chen, J Chen, KH Chen, Y Chen, Yanbei Chen, Yitian Chen, HP Cheng, P 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T Evstafyeva, BE Ewing, JM Ezquiaga, F Fabrizi, F Faedi, V Fafone, S Fairhurst, AM Farah, B Farr, WM Farr, G Favaro, M Favata, M Fays, M Fazio, J Feicht, MM Fejer, R Felicetti, E Fenyvesi, DL Ferguson, S Ferraiuolo, I Ferrante, TA Ferreira, F Fidecaro, P Figura, A Fiori, I Fiori, M Fishbach, RP Fisher, R Fittipaldi, V Fiumara, R Flaminio, SM Fleischer, LS Fleming, E Floden, EM Foley, H Fong, JA Font, B Fornal, PWF Forsyth, K Franceschetti, N Franchini, S Frasca, F Frasconi, A Frattale Mascioli, Z Frei, A Freise, O Freitas, R Frey, W Frischhertz, P Fritschel, VV Frolov, GG Fronzé, M Fuentes-Garcia, S Fujii, T Fujimori, P Fulda, M Fyffe, B Gadre, JR Gair, S Galaudage, V Galdi, H Gallagher, S Gallardo, B Gallego, R Gamba, A Gamboa, D Ganapathy, A Ganguly, B Garaventa, J García-Bellido, C García Núñez, C García-Quirós, JW Gardner, KA Gardner, J Gargiulo, A Garron, F Garufi, C Gasbarra, B Gateley, V Gayathri, G Gemme, A Gennai, V Gennari, J George, R George, O Gerberding, L Gergely, 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Morras, A Moscatello, P Mourier, B Mours, CM Mow-Lowry, F Muciaccia, Arunava Mukherjee, D Mukherjee, Samanwaya Mukherjee, Soma Mukherjee, Subroto Mukherjee, Suvodip Mukherjee, N Mukund, A Mullavey, J Munch, J Mundi, CL Mungioli, WR Munn Oberg, Y Murakami, M Murakoshi, PG Murray, S Muusse, D Nabari, SL Nadji, A Nagar, N Nagarajan, KN Nagler, K Nakagaki, K Nakamura, H Nakano, M Nakano, D Nandi, V Napolano, P Narayan, I Nardecchia, T Narikawa, H Narola, L Naticchioni, RK Nayak, J Neilson, A Nelson, TJN Nelson, M Nery, A Neunzert, S Ng, L Nguyen Quynh, SA Nichols, AB Nielsen, G Nieradka, A Niko, Y Nishino, A Nishizawa, S Nissanke, E Nitoglia, W Niu, F Nocera, M Norman, C North, J Novak, JF Nuño Siles, LK Nuttall, K Obayashi, J Oberling, J O'Dell, M Oertel, A Offermans, G Oganesyan, JJ Oh, K Oh, T O'Hanlon, M Ohashi, M Ohkawa, F Ohme, AS Oliveira, R Oliveri, B O'Neal, K Oohara, B O'Reilly, ND Ormsby, M Orselli, R O'Shaughnessy, S O'Shea, Y Oshima, S Oshino, S Ossokine, C Osthelder, I Ota, DJ Ottaway, A Ouzriat, H Overmier, BJ Owen, AE Pace, R Pagano, MA Page, A Pai, A Pal, S Pal, MA Palaia, M Pálfi, PP Palma, C Palomba, P Palud, H Pan, J Pan, KC Pan, R Panai, PK Panda, S Pandey, L Panebianco, PTH Pang, F Pannarale, KA Pannone, BC Pant, FH Panther, F Paoletti, A Paolone, EE Papalexakis, L Papalini, G Papigkiotis, A Paquis, A Parisi, B-J Park, J Park, W Parker, G Pascale, D Pascucci, A Pasqualetti, R Passaquieti, L Passenger, D Passuello, O Patane, D Pathak, M Pathak, A Patra, B Patricelli, AS Patron, K Paul, S Paul, E Payne, T Pearce, M Pedraza, R Pegna, A Pele, FE Peña Arellano, S Penn, MD Penuliar, A Perego, Z Pereira, JJ Perez, C Périgois, G Perna, A Perreca, J Perret, S Perriès, JW Perry, D Pesios, S Petracca, C Petrillo, HP Pfeiffer, H Pham, KA Pham, KS Phukon, H Phurailatpam, M Piarulli, L Piccari, OJ Piccinni, M Pichot, M Piendibene, F Piergiovanni, L Pierini, G Pierra, V Pierro, M Pietrzak, M Pillas, F Pilo, L Pinard, IM Pinto, M Pinto, BJ Piotrzkowski, M 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Weaving, SA Webster, M Weinert, AJ Weinstein, R Weiss, F Wellmann, L Wen, P Weßels, K Wette, JT Whelan, BF Whiting, C Whittle, JB Wildberger, OS Wilk, D Wilken, AT Wilkin, DJ Willadsen, K Willetts, D Williams, MJ Williams, NS Williams, JL Willis, B Willke, M Wils, J Winterflood, CC Wipf, G Woan, J Woehler, JK Wofford, NE Wolfe, HT Wong, HWY Wong, ICF Wong, JL Wright, M Wright, C Wu, DS Wu, H Wu, E Wuchner, DM Wysocki, VA Xu, Y Xu, N Yadav, H Yamamoto, K Yamamoto, TS Yamamoto, T Yamamoto, S Yamamura, R Yamazaki, S Yan, T Yan, FW Yang, F Yang, KZ Yang, Y Yang, Z Yarbrough, H Yasui, S-W Yeh, AB Yelikar, X Yin, J Yokoyama, T Yokozawa, J Yoo, H Yu, S Yuan, H Yuzurihara, A Zadrożny, M Zanolin, M Zeeshan, T Zelenova, J-P Zendri, M Zeoli, M Zerrad, M Zevin, AC Zhang, L Zhang, R Zhang, T Zhang, Y Zhang, C Zhao, Yue Zhao, Yuhang Zhao, Y Zheng, H Zhong, R Zhou, X-J Zhu, Z-H Zhu, AB Zimmerman, ME Zucker, J Zweizig

Dynamics of the fermion-rotor system

Journal of High Energy Physics Springer 2026:1 (2026) 52

Authors:

Vazha Loladze, Takemichi Okui, David Tong

Abstract:

We explore the dynamics of the fermion-rotor system, a simple impurity model in d = 1 +1 dimensions consisting of a collection of purely right-moving fermions interacting with a quantum mechanical rotor localised at the origin. This was first introduced by Polchinski as a toy model for monopole-fermion scattering and is surprisingly subtle, with ingoing and outgoing fermions carrying different quantum numbers. We show that the rotor acts as a twist operator in the low-energy theory, changing the quantum numbers of excitations that have previously passed through the origin to ensure scattering consistent with all symmetries. We further show how generalisations of this model with multiple rotors and unequal charges can be viewed as a UV-completion of boundary states for chiral theories, including the well-studied 3450 model. We compute correlation functions between ingoing and outgoing fermions, and show that fermions dressed with the rotor degree of freedom act as local operators and create single-particle states, generalizing an earlier result obtained in a theory with a single rotor and equal charges. Finally, we point out a mod 2 anomaly in these models that descends from the Witten anomaly in 4d.

Metastable cosmic strings are broken at the start

(2026)

Authors:

Lorenzo Tranchedone, Ethan Carragher, Edward Hardy, Natálie Koscelanská van IJcken

Search for dark matter in association with a Higgs boson at the LHC: A model independent study

Nuclear Physics B 1022 (2026)

Authors:

S Baradia, S Bhattacharyya, A Datta, S Dutta, S Roy Chowdhury, S Sarkar

Abstract:

Astrophysical and cosmological observations strongly support the existence of Dark Matter (DM). In this study, we investigate the potential of the mono-Higgs plus missing transverse energy signature at the LHC to search for a fermionic DM candidate using the framework of Effective Field Theory. In our study, the DM interacts with the Standard Model (SM) via dimension-6 and dimension-7 effective operators involving the Higgs and the gauge bosons. Although our analysis is independent of any Ultra Violet complete dynamics of DM, such interactions can be realized in an extension of the SM where the gauge group is extended minimally by adding an extra U (1). Boosted Decision Tree (BDT) discriminators are used to estimate and optimize the signal sensitivity over the SM backgrounds, assuming an integrated luminosity of 3000fb−1 at s=14 TeV at the High Luminosity phase of the LHC (HL-LHC). In the most optimistic scenario, a significance exceeding 3 σ can be achieved for relic masses ranging from 90 to 300 GeV, which showcases the prospects of the search at the HL-LHC. This study provides a foundation for future explorations in this direction.