Particle theory

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Measurement of ion acceleration and diffusion in a laser-driven magnetized plasma

Nature Communications Nature Research (2026)

Authors:

JTY Chu, JWD Halliday, C Heaton, K Moczulski, A Blazevic, D Schumacher, M Metternich, H Nazary, CD Arrowsmith, AR Bell, KA Beyer, AFA Bott, T Campbell, E Hansen, DQ Lamb, F Miniati, P Neumayer, CAJ Palmer, B Reville, A Reyes, S Sarkar, A Scopatz, C Spindloe, CB Stuart, H Wen, P Tzeferacos, R Bingham, G Gregori

Abstract:

Here we present results from an experiment performed at the GSI Helmholtz Center for Heavy Ion Research. A mono-energetic beam of chromium ions with initial energies of  ~ 450 MeV was fired through a magnetized interaction region formed by the collision of two counter-propagating laser-ablated plasma jets. While laser interferometry revealed the absence of strong fluid-scale turbulence, acceleration and diffusion of the beam ions was driven by wave-particle interactions. A possible mechanism is particle acceleration by electrostatic, short scale length kinetic turbulence, such as the lower-hybrid drift instability.

Probing the Dark Matter EFT with QUEST-DMC: Projected Sensitivities and Attenuation Ceilings

(2026)

Authors:

DMC Collaboration, N Darvishi, S Autti, L Bloomfield, A Casey, N Eng, P Franchini, RP Haley, PJ Heikkinen, A Jennings, A Kemp, E Leason, J March-Russell, A Mayer, J Monroe, D Munstermann, MT Noble, JR Prance, X Rojas, T Salmon, J Saunders, J Smirnov, R Smith, MD Thompson, A Thomson, A Ting, V Tsepelin, SM West, L Whitehead, DE Zmeev

A Search for Millimeter-bright Blazars as Astrophysical Neutrino Sources

The Astrophysical Journal American Astronomical Society 999:1 (2026) 98

Authors:

R Abbasi, M Ackermann, J Adams, SK Agarwalla, JA Aguilar, M Ahlers, JM Alameddine, 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

Abstract:

The powerful jets of blazars have been historically considered as likely sites of high-energy cosmic-ray acceleration. However, the particulars of the launched jet and the locations of leptonic and hadronic jet loading remain unclear. In the case when leptonic and hadronic particle injection occur jointly, a temporal correlation between synchrotron radiation and neutrino production is expected. We use a first catalog of millimeter wavelength (95–225 GHz) blazar light curves from the Atacama Cosmology Telescope for a time-dependent correlation with 12 yr of muon neutrino events from the IceCube South Pole Neutrino Observatory. Such millimeter emission traces activity of the bright jet base, which is often self-absorbed at lower frequencies and potentially gamma-ray opaque. We perform an analysis of the population, as well as analyses of individual, selected sources. We do not observe a significant signal from the stacked population. TXS 0506+056 is found as the most significant, individual source, though this detection is not globally significant in our analysis of selected active galactic nuclei. Our results suggest that the majority of millimeter-bright blazars are neutrino dim. In general, it is possible that many blazars have lighter, leptonic jets, or that only selected blazars provide exceptional conditions for neutrino production.

Laboratory observation of collective beam-plasma instabilities in a relativistic pair jet

(2026)

Authors:

JWD Halliday, CD Arrowsmith, AM Goillot, PJ Bilbao, P Simon, V Stergiou, S Zhang, P Alexaki, M Bochmann, AFA Bott, S Burger, H Chen, FD Cruz, T Davenne, A Dyson, A Ebn Rahmoun, I Efthymiopoulos, DH Froula, JT Gudmundsson, D Haberberger, T Hodge, S Iaquinta, EE Los, G Marshall, F Miniati, S Parker, B Reville, P Rousiadou, S Sarkar, AA Schekochihin, KG Schlesinger, LO Silva, T Silva, R Simpson, E Soria, RMGM Trines, T Vieu, N Charitonidis, R Bingham, G Gregori

hoppet v2 release note

The European Physical Journal C SpringerOpen 86:2 (2026) 157-157

Authors:

Alexander Karlberg, Paolo Nason, Gavin Salam, Giulia Zanderighi, Frédéric Dreyer

Abstract:

We document the three main new features in the v2 release series of the hoppet parton distribution function evolution code, specifically support for N 3 LO QCD evolution in the variable flavour number scheme, for the determination of hadronic structure functions for massless quarks up to N 3 LO, and for QED evolution to an accuracy phenomenologically equivalent to NNLO QCD. Additionally we describe a new Python interface, CMake build option, functionality to save a hoppet table as an LHAPDF grid and update our performance benchmarks, including optimisations in interpolating PDF tables.