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Miro, C., Nebot, M., & Queiroz, D. (2025). Light states in real multi-Higgs models with spontaneous CP violation. Phys. Rev. D, 111(11), L111703–7pp.
Abstract: In models with extended scalar sectors consisting of multiple Higgs doublets that trigger spontaneous electroweak symmetry breaking, it might be expected that the abundance of dimensionful quadratic couplings in the scalar potential could allow for a regime where, apart from the would-be Goldstone bosons and a neutral Higgs-like state, all new scalars have masses much larger than the electroweak scale. In the case of models where CP invariance holds at the Lagrangian level but is broken by the vacuum, we show that such a reasonable expectation does not hold. When perturbativity requirements are placed on the dimensionless quartic couplings, the spectrum of the new scalars includes one charged and two additional neutral states whose masses cannot be much larger than the electroweak scale.
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De Romeri, V., Papoulias, D. K., Sanchez Garcia, G., Ternes, C. A., & Tortola, M. (2025). Neutrino electromagnetic properties and sterile dipole portal in light of the first solar CEνNS data. J. Cosmol. Astropart. Phys., 05(5), 080–20pp.
Abstract: Despite being neutral particles, neutrinos can acquire non-zero electromagnetic properties from radiative corrections that can be induced by the presence of new physics. Electromagnetic neutrino processes induce spectral distortions in neutrino scattering data, which are especially visible at experiments characterized by low recoil thresholds. We investigate how neutrino electromagnetic properties confront the recent indication of coherent elastic neutrino-nucleus scattering (CE nu NS) from 8B solar neutrinos in dark matter direct detection experiments. We focus on three possibilities: neutrino magnetic moments, neutrino electric charges, and the active-sterile transition magnetic moment portal. We analyze recent XENONnT and PandaX-4T data and infer the first CE nu NS-based constraints on electromagnetic properties using solar 8B neutrinos.
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Decant, Q., Dimitriou, A., Lopez-Honorez, L., & Zaldivar, B. (2025). Simulation-based inference on warm dark matter from HERA forecasts. J. Cosmol. Astropart. Phys., 07(7), 004–40pp.
Abstract: The redshifted 21cm signal from Cosmic Dawn promises to open a new window into the early history of our universe and enable the probing of an unprecedented comoving survey volume. In this work, we revisit the imprint of Warm Dark Matter (WDM) on the 21cm signal power spectrum using an updated implementation of the WDM effect in the public code 21cmFast and considering a single population of cosmic dawn galaxies. By focusing on inferring the WDM mass, we analyze the degeneracies between the latter and the astrophysics parameters characterizing star formation and X-ray heating and we emphasize the role of the threshold mass for star-forming galaxies, Mturn. We study the capability of the recently built HERA telescope to reconstruct the WDM mass by adopting the statistical approach of simulation-based inference. We include a comparison of the per-parameter reconstruction quality for different number of simulations used in the training of the algorithm. Our results this study may also influence the strength of the WDM constraint for lower threshold masses.
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Cepeda, M., No, J. M., Ramos, C., Sanda Seoane, R. M., & Zurita, J. (2025). Exotic h → Za Higgs decays into τ leptons. J. High Energy Phys., 07(7), 009–25pp.
Abstract: Exotic Higgs decays are among the most promising areas to be explored at the High-Luminosity LHC, given the unprecedentedly large amount (similar to 3 x 10(8)) of 125 GeV Higgs bosons that will be produced. In this context, we propose a new search channel for which the Higgs boson decays to a (leptonically decaying) Z boson and a light BSM pseudoscalar a, which subsequently decays to a pair of tau-leptons (h -> Za -> ll tau tau). After performing a validation of existing ATLAS and CMS exotic Higgs decay searches in related channels, we analyze the HL-LHC projected sensitivity of our a -> tau tau search, targeting the kinematic region where the exotic Higgs decay is two-body. We are able to probe pseudoscalar masses m(a) is an element of [5, 33] GeV by leveraging both leptonic and hadronic tau decays, and establish model-independent 95% C.L. sensitivity projections on the branching fraction BR(h -> Za) x BR(a -> tau tau). These a -> tau tau projections yield a competitive probe of light pseudoscalars, which depending on the model can become significantly more sensitive than projections from existing experimental searches in a -> μμand a -> gamma gamma final states. Finally, we explore the potential of our search to probe an Axion-Like-Particle (ALP) solution to the muon (g – 2) anomaly (when taken face-value), finding that our proposed h -> Za, a -> tau tau search can provide valuable constraints on such ALP scenario, in complementarity with existing h -> Za, a -> gamma gamma experimental searches.
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Lang, N., & Wilson, D. J. (2025). D1 and D2 resonances in coupled-channel scattering amplitudes from lattice QCD. J. High Energy Phys., 07(7), 060–50pp.
Abstract: Isospin-1/2 charmed axial-vector D∗π−D∗η−D∗sK¯ scattering amplitudes are computed, along with interactions in several other I=1/2 JP channels. Using lattice QCD, we work at a light-quark mass corresponding to mπ≈391 MeV, where the lowest three-hadron threshold (Dππ) lies high enough to enable a rigorous treatment of this system considering only two-hadron scattering channels. At this light-quark mass, an axial-vector D1 bound state is observed just below D∗π threshold, that is strongly coupled to D∗π in a relative S-wave and influences a wide energy region up to the D∗η threshold. An axial-vector D′1 resonance is observed in the elastic D∗π energy-region, which is coupled more strongly to D-wave D∗π. A single narrow tensor state is seen in JP=2+ coupled to both Dπ and D∗π. In the region where D∗η and D∗sK¯ are kinematically open, the available energy levels indicate significant S-wave interactions. Upon searching this region for poles, several possibilities exist with large uncertainties. One additional state consistently arises, predominantly coupled to the S-wave D∗π−D∗η−D∗sK¯ amplitudes around the upper energy limit of this analysis.
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