Extensions of the Standard Model featuring both an enlarged scalar sector and vector-like fermions arise naturally in a wide class of well-motivated theoretical frameworks. In such scenarios, vectorlike quarks (VLQs) can exhibit nonstandard decay modes involving additional Higgs states, giving rise to distinctive collider signatures that remain largely unexplored by existing experimental searches. We investigate the prospects of probing this possibility at the high-luminosity Large Hadron Collider (HL-LHC) through the decay of vector-like top partner () to charged Higgs () followed by the decay, , producing a final state containing two tau leptons, two jets, and missing transverse energy. A model-independent collider analysis is performed using global kinematic observables constructed from visible objects and the missing transverse momentum vector to suppress the dominant backgrounds. Polarization-sensitive observables built from the hadronic decay products are also examined as complementary probes of the spin-0 origin of the leptons. The expected discovery sensitivity is evaluated using the Asimov significance for an integrated luminosity of at . Our results demonstrate that the (where is the missing transverse energy) channel provides a promising and largely orthogonal avenue to search for non-standard VLQ decays in extended Higgs sectors, with discovery-level sensitivity achievable for VLQ masses up to approximately 1.9 TeV.
"}],"arxiv_eprints":[{"categories":["hep-ph","hep-ex"],"value":["10.1103/9pv5-qcfv","2606.20054"]}],"authors":[{"affiliations":[{"country":"India","organization":"Indian Institute of Science Education and Research Thiruvananthapuram, Vithura, Kerala 695 551, India","value":"Indian Institute of Science Education and Research Thiruvananthapuram, Vithura, Kerala 695 551, India"}],"email":null,"full_name":null,"given_names":"Tanumoy","surname":"Mandal"},{"affiliations":[{"country":"United Kingdom","organization":"School of Physics and Astronomy, University of Southampton, Southampton SO17 1BJ, United Kingdom","value":"School of Physics and Astronomy, University of Southampton, Southampton SO17 1BJ, United Kingdom"},{"country":"Sweden","organization":"Department of Physics and Astronomy, Uppsala University, Box 516, SE-751 20 Uppsala, Sweden","value":"Department of Physics and Astronomy, Uppsala University, Box 516, SE-751 20 Uppsala, Sweden"}],"email":null,"full_name":null,"given_names":"Stefano","surname":"Moretti"},{"affiliations":[{"country":"India","organization":"Indian Institute of Science Education and Research Thiruvananthapuram, Vithura, Kerala 695 551, India","value":"Indian Institute of Science Education and Research Thiruvananthapuram, Vithura, Kerala 695 551, India"}],"email":null,"full_name":null,"given_names":"Rachit","surname":"Sharma"}],"collections":[{"primary":"Physical Review D"}],"control_number":111660,"copyright":[{"statement":"Published by the American Physical Society","holder":"","year":2026}],"dois":[{"value":"10.1103/9pv5-qcfv"},{"value":"2606.20054"}],"imprints":[{"date":null,"publisher":"APS"}],"license":[{"license":"CC-BY-4.0","url":"http://creativecommons.org/licenses/by/4.0/"}],"page_nr":[],"publication_info":[{"artid":"","journal_issue":"7","journal_title":"Physical Review D","journal_volume":"114","page_end":"","page_start":"","year":"2026"}],"record_creation_date":"2026-10-02T18:00:19.338039+00:00","titles":[{"source":"APS","title":"Nonstandard decays of vectorlike top partners in a two-Higgs-doublet model at the HL-LHC"}]},"updated":"2026-10-03T00:00:38.599775+00:00","id":111660,"created":"2026-10-02T18:00:19.338039+00:00"},{"metadata":{"_files":[{"file":"https://scoap3-prod-backend.s3.cern.ch/media/harvested_files/10.1103/47cq-vdfk/47cq-vdfk.pdf","key":"47cq-vdfk","filetype":"pdf"},{"file":"https://scoap3-prod-backend.s3.cern.ch/media/harvested_files/10.1103/47cq-vdfk/47cq-vdfk.xml","key":"47cq-vdfk","filetype":"xml"}],"abstracts":[{"source":"APS","value":"We study the exclusive production of dileptons in proton-proton collisions as a probe of the proton charge-radius scale. Using a dipole form factor model, we compare the conventional choice of with Particle Data Group test scenarios corresponding to and , representative of the historical large radius from CODATA and smaller radius from muonic-hydrogen determinations, respectively. The sensitivity is greatest at large dilepton invariant masses and forward/backward rapidity. Fitting to the current ATLAS and CMS data within the adopted model gives , corresponding to an effective radius , which indicates nontrivial sensitivity on the proton-radius scale, but is not yet a definitive solution to the proton-radius puzzle. While this result depends on the theoretical model used in the calculation, it shows that exclusive dilepton production at the LHC can provide complementary model-dependent information on the proton electromagnetic form factor.
"}],"arxiv_eprints":[{"categories":["hep-ph"],"value":["10.1103/47cq-vdfk","2606.19604"]}],"authors":[{"affiliations":[{"country":"Poland","organization":"Institute of Nuclear Physics Polish Academy of Sciences, Radzikowskiego 152, PL-31-342 Kraków, Poland","value":"Institute of Nuclear Physics Polish Academy of Sciences, Radzikowskiego 152, PL-31-342 Kraków, Poland"}],"email":null,"full_name":null,"given_names":"Nikhil","surname":"Krishna"},{"affiliations":[{"country":"Poland","organization":"Institute of Nuclear Physics Polish Academy of Sciences, Radzikowskiego 152, PL-31-342 Kraków, Poland","value":"Institute of Nuclear Physics Polish Academy of Sciences, Radzikowskiego 152, PL-31-342 Kraków, Poland"}],"email":null,"full_name":null,"given_names":"Mariola","surname":"Kłusek-Gawenda"},{"affiliations":[{"country":"Poland","organization":"Institute of Nuclear Physics Polish Academy of Sciences, Radzikowskiego 152, PL-31-342 Kraków, Poland","value":"Institute of Nuclear Physics Polish Academy of Sciences, Radzikowskiego 152, PL-31-342 Kraków, Poland"}],"email":null,"full_name":null,"given_names":"Rafał","surname":"Staszewski"}],"collections":[{"primary":"Physical Review D"}],"control_number":111659,"copyright":[{"statement":"Published by the American Physical Society","holder":"","year":2026}],"dois":[{"value":"10.1103/47cq-vdfk"},{"value":"2606.19604"}],"imprints":[{"date":null,"publisher":"APS"}],"license":[{"license":"CC-BY-4.0","url":"http://creativecommons.org/licenses/by/4.0/"}],"page_nr":[],"publication_info":[{"artid":"","journal_issue":"7","journal_title":"Physical Review D","journal_volume":"114","page_end":"","page_start":"","year":"2026"}],"record_creation_date":"2026-10-02T18:00:19.117670+00:00","titles":[{"source":"APS","title":"Sensitivity of the photon-induced processes to the proton charge radius"}]},"updated":"2026-10-03T00:00:38.744526+00:00","id":111659,"created":"2026-10-02T18:00:19.117670+00:00"},{"metadata":{"_files":[{"file":"https://scoap3-prod-backend.s3.cern.ch/media/harvested_files/10.1007/JHEP10(2026)030/13130_2026_Article_30197.xml.scoap.xml","key":"13130_2026_Article_30197.xml.scoap","filetype":"xml"},{"file":"https://scoap3-prod-backend.s3.cern.ch/media/harvested_files/10.1007/JHEP10(2026)030/13130_2026_Article_30197_a.pdf","key":"13130_2026_Article_30197_a","filetype":"pdf"}],"abstracts":[{"source":"Springer","value":"We extend the hidden zeros and 2-split of tree-level Tr($\\textit{ϕ}$ ) amplitudes to loop-level Feynman integrands, apart from some physically irrelevant scaleless integrals. Our method is based on a certain factorization mechanism that occurs in Feynman diagrams when summing over shuffle permutations. The loop-level hidden zeros and 2-split identified in this work differ from those in the literature. In our result, the kinematic conditions for loop-level hidden zeros and 2-split are remarkably simple. Their connection is as tight as at tree-level, with the same procedure for obtaining the 2-split condition from the zero condition. The resulting 2-split formula at loop-level represents a generalization of that at tree-level: the $\\textit{L}$-loop integrand is expressed as a sum over $\\textit{L}$ + 1 terms, each of which exhibits a 2-split structure."}],"arxiv_eprints":[{"categories":["hep-th"],"value":["10.1007/JHEP10(2026)030","2604.13810"]}],"authors":[{"affiliations":[{"country":"China","organization":"College of Physical Science and Technology, Yangzhou University","value":"Center for Gravitation and Cosmology, College of Physical Science and Technology, Yangzhou University, No.180, Siwangting Road, Yangzhou, 225009, P.R. China"}],"email":null,"full_name":null,"given_names":"Kang","surname":"Zhou"}],"collections":[{"primary":"Journal of High Energy Physics"}],"control_number":111671,"copyright":[{"statement":"","holder":"The Author(s)","year":2026}],"dois":[{"value":"10.1007/JHEP10(2026)030"},{"value":"2604.13810"}],"imprints":[{"date":null,"publisher":"Springer"}],"license":[{"license":"CC-BY-4.0","url":"http://creativecommons.org/licenses/by/4.0/"}],"page_nr":[34],"publication_info":[{"artid":"JHEP10(2026)030","journal_issue":"10","journal_title":"Journal of High Energy Physics","journal_volume":"2026","page_end":"34","page_start":"1","year":"2026"}],"record_creation_date":"2026-10-02T18:55:55.888908","titles":[{"source":"Springer","title":"Towards new hidden zero and 2-split of loop-level Feynman yntegrands in Tr($\\textit{ϕ}$ 3) model"}]},"updated":"2026-10-02T18:56:02.329042+00:00","id":111671,"created":"2026-10-02T18:55:55.888908"},{"metadata":{"_files":[{"file":"https://scoap3-prod-backend.s3.cern.ch/media/harvested_files/10.1007/JHEP10(2026)040/13130_2026_Article_30207.xml.scoap.xml","key":"13130_2026_Article_30207.xml.scoap","filetype":"xml"},{"file":"https://scoap3-prod-backend.s3.cern.ch/media/harvested_files/10.1007/JHEP10(2026)040/13130_2026_Article_30207_a.pdf","key":"13130_2026_Article_30207_a","filetype":"pdf"}],"abstracts":[{"source":"Springer","value":"We study the cosmological implications of the minimal non-linear realisation of scale invariance within the Standard Model (SM). This framework provides a technically natural explanation for the hierarchy between the Planck scale and the electroweak scale and introduces only a light, feebly coupled dilaton field beyond the SM particles. Although the model is almost indistinguishable from the minimal SM at low energies, its cosmological consequences differ dramatically. In particular, the electroweak Higgs field remains trapped in the symmetric phase until the Universe cools to very low temperatures, $$ {T}_c^{\\left(\\chi \\right)} $$ ~ 28 MeV, where the first-order QCD chiral symmetry-breaking phase transition triggers the electroweak phase transition. This scenario offers intriguing possibilities for the production of primordial black holes, low-frequency gravitational waves, and multi-quark and lepton nuggets, which we explore in some detail using simplified approximations."}],"arxiv_eprints":[{"categories":["hep-ph","astro-ph.CO","hep-th"],"value":["10.1007/JHEP10(2026)040","2603.18406"]}],"authors":[{"affiliations":[{"country":"Australia","organization":"School of Physics, The University of Sydney","value":"Sydney Consortium for Particle Physics and Cosmology, School of Physics, The University of Sydney, Physics Rd A28, Sydney, NSW, 2006, Australia"}],"email":null,"full_name":null,"given_names":"Joshua","surname":"Cesca"},{"affiliations":[{"country":"Australia","organization":"School of Physics, The University of Sydney","value":"Sydney Consortium for Particle Physics and Cosmology, School of Physics, The University of Sydney, Physics Rd A28, Sydney, NSW, 2006, Australia"}],"email":null,"full_name":null,"given_names":"Archil","surname":"Kobakhidze"}],"collections":[{"primary":"Journal of High Energy Physics"}],"control_number":111672,"copyright":[{"statement":"","holder":"The Author(s)","year":2026}],"dois":[{"value":"10.1007/JHEP10(2026)040"},{"value":"2603.18406"}],"imprints":[{"date":null,"publisher":"Springer"}],"license":[{"license":"CC-BY-4.0","url":"http://creativecommons.org/licenses/by/4.0/"}],"page_nr":[36],"publication_info":[{"artid":"JHEP10(2026)040","journal_issue":"10","journal_title":"Journal of High Energy Physics","journal_volume":"2026","page_end":"36","page_start":"1","year":"2026"}],"record_creation_date":"2026-10-02T18:55:55.689767","titles":[{"source":"Springer","title":"QCD and electroweak phase transitions with hidden scale invariance: implications for primordial black holes, quark-lepton nuggets and gravitational waves"}]},"updated":"2026-10-02T18:56:02.382839+00:00","id":111672,"created":"2026-10-02T18:55:55.689767"},{"metadata":{"_files":[{"file":"https://scoap3-prod-backend.s3.cern.ch/media/harvested_files/10.1007/JHEP10(2026)021/13130_2026_Article_30188.xml.scoap.xml","key":"13130_2026_Article_30188.xml.scoap","filetype":"xml"},{"file":"https://scoap3-prod-backend.s3.cern.ch/media/harvested_files/10.1007/JHEP10(2026)021/13130_2026_Article_30188_a.pdf","key":"13130_2026_Article_30188_a","filetype":"pdf"}],"abstracts":[{"source":"Springer","value":"Soft de Sitter Effective Theory is a well-motivated candidate for the correct effective late-time description of equal-time correlation functions in de Sitter space. In this work, we study its application to theories that enjoy classical conformal invariance, using the conformally-coupled $\\textit{ϕ}$ -theory as a toy model. While quantum effects generate non-trivial late-time dynamics in such models, we argue that it is not described by the standard construction of the effective theory as discussed thus far in the literature. We show that the tree-level matching of the trispectrum onto the effective theory does not fit into the expected power-counting scheme, and we contrast it with the matching of the tree-level bispectrum in the conformally-coupled $\\textit{ϕ}$ -theory, where it works consistently. We then propose a prescription to identify the leading superhorizon degrees of freedom in such theories, which should serve as the starting point for the construction of their late-time effective description. The interpretation of logarithms of the form ln(−$\\textit{kη}$) in this context is briefly discussed."}],"arxiv_eprints":[{"categories":["hep-th","astro-ph.CO","hep-ph"],"value":["10.1007/JHEP10(2026)021","2607.06679"]}],"authors":[{"affiliations":[{"country":"Spain","organization":"Universidad de Granada","value":"Departamento de Física Teórica y del Cosmos, Universidad de Granada, Campus de Fuentenueva, Granada, E-18071, Spain"}],"email":null,"full_name":null,"given_names":"Maria","surname":"Fiore"},{"affiliations":[{"country":"Spain","organization":"Universidad de Granada","value":"Departamento de Física Teórica y del Cosmos, Universidad de Granada, Campus de Fuentenueva, Granada, E-18071, Spain"}],"email":null,"full_name":null,"given_names":"Andrea","surname":"Sanfilippo"}],"collections":[{"primary":"Journal of High Energy Physics"}],"control_number":111666,"copyright":[{"statement":"","holder":"The Author(s)","year":2026}],"dois":[{"value":"10.1007/JHEP10(2026)021"},{"value":"2607.06679"}],"imprints":[{"date":null,"publisher":"Springer"}],"license":[{"license":"CC-BY-4.0","url":"http://creativecommons.org/licenses/by/4.0/"}],"page_nr":[21],"publication_info":[{"artid":"JHEP10(2026)021","journal_issue":"10","journal_title":"Journal of High Energy Physics","journal_volume":"2026","page_end":"21","page_start":"1","year":"2026"}],"record_creation_date":"2026-10-02T18:55:55.674801","titles":[{"source":"Springer","title":"Classical conformal invariance and superhorizon dynamics in de Sitter"}]},"updated":"2026-10-02T18:56:01.345724+00:00","id":111666,"created":"2026-10-02T18:55:55.674801"},{"metadata":{"_files":[{"file":"https://scoap3-prod-backend.s3.cern.ch/media/harvested_files/10.1007/JHEP10(2026)035/13130_2026_Article_30202.xml.scoap.xml","key":"13130_2026_Article_30202.xml.scoap","filetype":"xml"},{"file":"https://scoap3-prod-backend.s3.cern.ch/media/harvested_files/10.1007/JHEP10(2026)035/13130_2026_Article_30202_a.pdf","key":"13130_2026_Article_30202_a","filetype":"pdf"}],"abstracts":[{"source":"Springer","value":"The dressed propagator of a ghost coupled to ordinary fields develops a pair of complex conjugate poles in the first Riemann sheet above the multi-particle threshold. We study the implications of this pole structure for the asymptotic field and its negative-norm one-particle state. Within the operator formalism of local quantum field theory, we show that certain quadratic couplings between the ghost field and the composite field of the multi-particle state persist at asymptotic times. These induce quantum interference effects that render the negative-norm one-particle state non-orthogonal to a superposition of positive-norm multi-particle states. Consequently, no free asymptotic one-particle ghost state exists, while the true free asymptotic states have zero norm and hence vanishing localization probability. The real and imaginary parts of the complex mass admit a clear physical interpretation; in particular, the inverse imaginary part sets the timescale for the onset of non-orthogonality. A freely propagating ghost is therefore confined to time intervals much shorter than its inverse width, so that a detector can never observe an isolated ghost particle asymptotically. Open questions and potential applications are discussed in the conclusions."}],"arxiv_eprints":[{"categories":["hep-th","gr-qc","quant-ph"],"value":["10.1007/JHEP10(2026)035","2605.29047"]}],"authors":[{"affiliations":[{"country":"Spain","organization":"Universidade de Santiago de Compostela","value":"Departamento de Física de Partículas, Instituto Galego de Física de Altas Enerxías (IGFAE), Universidade de Santiago de Compostela, Santiago de Compostela, Galicia, 15705, Spain"}],"email":null,"full_name":null,"given_names":"Luca","surname":"Buoninfante"}],"collections":[{"primary":"Journal of High Energy Physics"}],"control_number":111667,"copyright":[{"statement":"","holder":"The Author(s)","year":2026}],"dois":[{"value":"10.1007/JHEP10(2026)035"},{"value":"2605.29047"}],"imprints":[{"date":null,"publisher":"Springer"}],"license":[{"license":"CC-BY-4.0","url":"http://creativecommons.org/licenses/by/4.0/"}],"page_nr":[29],"publication_info":[{"artid":"JHEP10(2026)035","journal_issue":"10","journal_title":"Journal of High Energy Physics","journal_volume":"2026","page_end":"29","page_start":"1","year":"2026"}],"record_creation_date":"2026-10-02T18:55:55.716660","titles":[{"source":"Springer","title":"Asymptotic quantum dynamics of ghost fields"}]},"updated":"2026-10-02T18:56:01.427733+00:00","id":111667,"created":"2026-10-02T18:55:55.716660"},{"metadata":{"_files":[{"file":"https://scoap3-prod-backend.s3.cern.ch/media/harvested_files/10.1007/JHEP10(2026)038/13130_2026_Article_30205.xml.scoap.xml","key":"13130_2026_Article_30205.xml.scoap","filetype":"xml"},{"file":"https://scoap3-prod-backend.s3.cern.ch/media/harvested_files/10.1007/JHEP10(2026)038/13130_2026_Article_30205_a.pdf","key":"13130_2026_Article_30205_a","filetype":"pdf"}],"abstracts":[{"source":"Springer","value":"We propose a novel mechanism for generating the baryon asymmetry of the Universe through leptogenesis in a scenario where the right-handed neutrinos are heavier than the maximal temperature of the Universe, and are never produced on-shell, neither by thermal nor by non-thermal mechanisms. We introduce a new scalar field, $\\textit{ϕ}$, lighter than the right-handed neutrinos, that couples to the latter via a Yukawa coupling, so that it decays into two lepton doublets and two higgs doublets via off-shell right-handed neutrinos. Then, we derive the CP asymmetry arising from the interference between tree-level and loop diagrams in the four-body decay, and we show that the generated baryon asymmetry can reproduce the observed value both in a scenario where $\\textit{ϕ}$ is responsible for the reheating of the Universe, and in a scenario where $\\textit{ϕ}$ is a generic scalar that remains in thermal equilibrium with the plasma."}],"arxiv_eprints":[{"categories":["hep-ph","astro-ph.CO"],"value":["10.1007/JHEP10(2026)038","2605.24163"]}],"authors":[{"affiliations":[{"country":"Germany","organization":"TUM School of Natural Sciences, Technical University of Munich","value":"Department of Physics, TUM School of Natural Sciences, Technical University of Munich, James-Franck-Str. 1, Garching, 85748, Germany"}],"email":null,"full_name":null,"given_names":"Simon","surname":"Cléry"},{"affiliations":[{"country":"Germany","organization":"TUM School of Natural Sciences, Technical University of Munich","value":"Department of Physics, TUM School of Natural Sciences, Technical University of Munich, James-Franck-Str. 1, Garching, 85748, Germany"}],"email":null,"full_name":null,"given_names":"Alejandro","surname":"Ibarra"},{"affiliations":[{"country":"Germany","organization":"TUM School of Natural Sciences, Technical University of Munich","value":"Department of Physics, TUM School of Natural Sciences, Technical University of Munich, James-Franck-Str. 1, Garching, 85748, Germany"}],"email":null,"full_name":null,"given_names":"Onur","surname":"Yonar"}],"collections":[{"primary":"Journal of High Energy Physics"}],"control_number":111668,"copyright":[{"statement":"","holder":"The Author(s)","year":2026}],"dois":[{"value":"10.1007/JHEP10(2026)038"},{"value":"2605.24163"}],"imprints":[{"date":null,"publisher":"Springer"}],"license":[{"license":"CC-BY-4.0","url":"http://creativecommons.org/licenses/by/4.0/"}],"page_nr":[18],"publication_info":[{"artid":"JHEP10(2026)038","journal_issue":"10","journal_title":"Journal of High Energy Physics","journal_volume":"2026","page_end":"18","page_start":"1","year":"2026"}],"record_creation_date":"2026-10-02T18:55:55.739015","titles":[{"source":"Springer","title":"Leptogenesis without on-shell right-handed neutrinos"}]},"updated":"2026-10-02T18:56:01.750279+00:00","id":111668,"created":"2026-10-02T18:55:55.739015"},{"metadata":{"_files":[{"file":"https://scoap3-prod-backend.s3.cern.ch/media/harvested_files/10.1007/JHEP10(2026)029/13130_2026_Article_30196.xml.scoap.xml","key":"13130_2026_Article_30196.xml.scoap","filetype":"xml"},{"file":"https://scoap3-prod-backend.s3.cern.ch/media/harvested_files/10.1007/JHEP10(2026)029/13130_2026_Article_30196_a.pdf","key":"13130_2026_Article_30196_a","filetype":"pdf"}],"abstracts":[{"source":"Springer","value":"We argue that the electromagnetic $\\textit{θ}$-term is a physical parameter of the Standard Model coupled to gravity. Specifically, in the context of 4-dimensional Einstein-Maxwell theory we show that there exist Euclidean field configurations that have finite action, are asymptotically flat, and feature non-zero electromagnetic second Chern number. These “gravitational Abelian instantons” correspond to a dyonic extension of a Euclidean wormhole. We argue that these configurations should be included in the gravitational path integral, and that doing so generates a non-perturbative contribution to the vacuum energy density that is $\\textit{θ}$-dependent. We provide a Lorentzian interpretation of these instantons as capturing the effect of quantum fluctuations corresponding to pair production and annihilation of charged black holes. When $\\textit{θ}$ is the expectation value of a dynamical axion field, the instantons presented here generate a potential for the axion, thereby breaking the axion shift symmetry. This provides yet another example of how quantum gravity violates global symmetries through the existence of black holes."}],"arxiv_eprints":[{"categories":["hep-th","gr-qc","hep-ph"],"value":["10.1007/JHEP10(2026)029","2512.13833"]}],"authors":[{"affiliations":[{"country":"United States","organization":"University of Washington","value":"Department of Physics, University of Washington, Seattle, WA, 98195, USA"}],"email":null,"full_name":null,"given_names":"Isabel","surname":"Garcia"},{"affiliations":[{"country":"United States","organization":"University of Washington","value":"Department of Physics, University of Washington, Seattle, WA, 98195, USA"}],"email":null,"full_name":null,"given_names":"Elliot","surname":"Maderazo"}],"collections":[{"primary":"Journal of High Energy Physics"}],"control_number":111673,"copyright":[{"statement":"","holder":"The Author(s)","year":2026}],"dois":[{"value":"10.1007/JHEP10(2026)029"},{"value":"2512.13833"}],"imprints":[{"date":null,"publisher":"Springer"}],"license":[{"license":"CC-BY-4.0","url":"http://creativecommons.org/licenses/by/4.0/"}],"page_nr":[37],"publication_info":[{"artid":"JHEP10(2026)029","journal_issue":"10","journal_title":"Journal of High Energy Physics","journal_volume":"2026","page_end":"37","page_start":"1","year":"2026"}],"record_creation_date":"2026-10-02T18:56:07.058649","titles":[{"source":"Springer","title":"Black holes and Abelian instantons"}]},"updated":"2026-10-02T18:56:11.315655+00:00","id":111673,"created":"2026-10-02T18:56:07.058649"},{"metadata":{"_files":[{"file":"https://scoap3-prod-backend.s3.cern.ch/media/harvested_files/10.1007/JHEP10(2026)037/13130_2026_Article_30204.xml.scoap.xml","key":"13130_2026_Article_30204.xml.scoap","filetype":"xml"},{"file":"https://scoap3-prod-backend.s3.cern.ch/media/harvested_files/10.1007/JHEP10(2026)037/13130_2026_Article_30204_a.pdf","key":"13130_2026_Article_30204_a","filetype":"pdf"}],"abstracts":[{"source":"Springer","value":"We apply the free-field construction of the heterotic string compactified on Berglund–Hübsch Calabi–Yau orbifolds by computing the full spectrum of massless $\\textit{E}$ singlets. The contribution of the descendant vertices is obtained by combining the exact content of the irreducible $\\textit{N}$ = 2 minimal model representations, encoded in the ranks of the Shapovalov matrices, with the twisted sector structure of the orbifold. The method reproduces the known spectrum of the quintic orbifold with Hodge numbers (17, 21), namely 17 generations, 21 antigenerations and 234 singlets. For the quintic itself we obtain 330 singlets. We show that this number, rather than the frequently quoted value 326, obtained from the geometric description, is the correct one at the Gepner point, in agreement with the Landau–Ginzburg computation of Kachru and Witten. We also provide an explicit construction of the general vertices. We then compute the new spectra of the two remaining quintic orbifolds, $\\textit{Z}$ [0, 1, 2, 3, 4] with (21, 1, 210) and $\\textit{Z}$ [0, 0, 0, 1, 4] with (49, 5, 258), where the exceptional Hodge number $\\textit{h}$ = 49 arises from the twisted sectors. All four examples satisfy exact mirror-symmetry checks."}],"arxiv_eprints":[{"categories":["hep-th"],"value":["10.1007/JHEP10(2026)037","2607.19289"]}],"authors":[{"affiliations":[{"country":"Israel","organization":"Ariel University","value":"Physics Department, Ariel University, Ariel, 40700, territories administered by Israel"}],"email":null,"full_name":null,"given_names":"Vladimir","surname":"Belavin"}],"collections":[{"primary":"Journal of High Energy Physics"}],"control_number":111675,"copyright":[{"statement":"","holder":"The Author(s)","year":2026}],"dois":[{"value":"10.1007/JHEP10(2026)037"},{"value":"2607.19289"}],"imprints":[{"date":null,"publisher":"Springer"}],"license":[{"license":"CC-BY-4.0","url":"http://creativecommons.org/licenses/by/4.0/"}],"page_nr":[16],"publication_info":[{"artid":"JHEP10(2026)037","journal_issue":"10","journal_title":"Journal of High Energy Physics","journal_volume":"2026","page_end":"16","page_start":"1","year":"2026"}],"record_creation_date":"2026-10-02T18:56:07.274875","titles":[{"source":"Springer","title":"The complete massless singlet spectrum in the free-field construction of heterotic strings on Calabi–Yau orbifolds"}]},"updated":"2026-10-02T18:56:11.401966+00:00","id":111675,"created":"2026-10-02T18:56:07.274875"},{"metadata":{"_files":[{"file":"https://scoap3-prod-backend.s3.cern.ch/media/harvested_files/10.1007/JHEP10(2026)033/13130_2026_Article_30200.xml.scoap.xml","key":"13130_2026_Article_30200.xml.scoap","filetype":"xml"},{"file":"https://scoap3-prod-backend.s3.cern.ch/media/harvested_files/10.1007/JHEP10(2026)033/13130_2026_Article_30200_a.pdf","key":"13130_2026_Article_30200_a","filetype":"pdf"}],"abstracts":[{"source":"Springer","value":"We investigate a novel production mechanism for long-lived dark photons at the LHC, arising from $\\textit{hidden radiation}$ emitted from $\\textit{χ}$ in $$ Z\\to \\overline{\\chi}\\chi $$ decays, where $\\textit{χ}$ is a fermionic dark matter candidate. The effective $\\textit{Zχχ}$ coupling is generated radiatively through one-loop diagrams involving the top quark and a new colored scalar. We show that dark photons produced via this $\\textit{hidden radiation}$ channel can dominate over the conventional sources — meson decays and proton bremsstrahlung — across wide regions of parameter space, particularly for small kinetic mixing and dark photon masses well above the GeV scale. Using this enhanced production mechanism, we analyze the sensitivity of dedicated long-lived particle detectors, including FASER2, FACET, and MATHUSLA. We find that these experiments can significantly surpass existing bounds, probing regions of dark photon parameter space consistent with the observed dark matter relic abundance and inaccessible in conventional dark photon scenarios."}],"arxiv_eprints":[{"categories":["hep-ph"],"value":["10.1007/JHEP10(2026)033","2605.03427"]}],"authors":[{"affiliations":[{"country":"Taiwan","organization":"National Taiwan Normal University","value":"Department of Physics, National Taiwan Normal University, Taipei, 116, Taiwan"}],"email":null,"full_name":null,"given_names":"Chuan-Ren","surname":"Chen"},{"affiliations":[{"country":"Taiwan","organization":"National Taiwan University","value":"Physics Division, National Center for Theoretical Sciences, National Taiwan University, Taipei, 106319, Taiwan"},{"country":"Vietnam","organization":"Phenikaa University","value":"Phenikaa Institute for Advanced Study, Phenikaa University, Nguyen Trac, Duong Noi, Hanoi, 100000, Vietnam"}],"email":null,"full_name":null,"given_names":"Van","surname":"Tran"}],"collections":[{"primary":"Journal of High Energy Physics"}],"control_number":111676,"copyright":[{"statement":"","holder":"The Author(s)","year":2026}],"dois":[{"value":"10.1007/JHEP10(2026)033"},{"value":"2605.03427"}],"imprints":[{"date":null,"publisher":"Springer"}],"license":[{"license":"CC-BY-4.0","url":"http://creativecommons.org/licenses/by/4.0/"}],"page_nr":[20],"publication_info":[{"artid":"JHEP10(2026)033","journal_issue":"10","journal_title":"Journal of High Energy Physics","journal_volume":"2026","page_end":"20","page_start":"1","year":"2026"}],"record_creation_date":"2026-10-02T18:56:07.077738","titles":[{"source":"Springer","title":"Search for long-lived dark photons from hidden radiation at the LHC"}]},"updated":"2026-10-02T18:56:11.469284+00:00","id":111676,"created":"2026-10-02T18:56:07.077738"}]}}