Publications

Order by: publication date number of citations

• Status of Radio MonteCarLow and Strong2020 $e^+e^-$ database activities

  Graziano Venanzoni

  SciPost Phys. Proc. 16, 033 (2025) · published 15 July 2025 | Toggle abstract · pdf

  During the last 15 years the Radio MonteCarLow Working Group has been providing valuable support to the development of radiative corrections and Monte Carlo generators for low energy $e^+e^-$ data and $\tau$-lepton decays. While the working group has been operating for more than 15 years without a formal basis for funding, parts of our program have recently been included as a Joint Research Initiative in the group application of the European hadron physics community, STRONG2020, to the European Union, with a more specific goal of creating an annotated database for low-energy hadronic cross sections in $e^+e^-$ collisions. We will report on both these initiatives.

• Tau lepton averages by the HFLAV group

  Alberto Lusiani

  SciPost Phys. Proc. 17, 001 (2025) · published 23 July 2025 | Toggle abstract · pdf

  We document some features of the preliminary draft of the tau lepton averages for the incoming HFLAV report. We include the tau mass and lifetime averages, and a fit of measurements of tau branching fraction measurements. Elaborations of these results provide lepton universality tests and determination of $|V_{us}|$ with tau measurements.

• Monte Carlos for tau lepton - Standard Model and new physics signatures

  Zbigniew Was

  SciPost Phys. Proc. 17, 002 (2025) · published 23 July 2025 | Toggle abstract · pdf

  One of the purposes of High Energy accelerator experiments is confrontation of theory and measurements in ever new realms. Any new agreement extends theory applicability domain, any discrepancy hints to unexplained, calling for better calculations or new, deeper theory. Often one has to search for small contributions over large Standard Model background. Multidimensional signatures and complex background subtraction cuts imply that Monte Carlo techniques are indispensable. My talk included description of: KKMC Monte Carlo for $e^+e^- \to \tau^+\tau^- (n\gamma)$ (with $\tau$ decays), generation of additional lepton pairs of SM and New Physics, and contributions from anomalous magnetic and electric dipole moments.

• Electromagnetic corrections in hadronic tau decays

  Jesús Alejandro Miranda Hernández

  SciPost Phys. Proc. 17, 003 (2025) · published 23 July 2025 | Toggle abstract · pdf

  We briefly review electromagnetic radiative corrections in semileptonic tau decays and their main applications.

• Electric and magnetic tau dipole moments revisited

  G. A. González-Sprinberg

  SciPost Phys. Proc. 17, 004 (2025) · published 23 July 2025 | Toggle abstract · pdf

  Precise measurements of magnetic and electric dipole moments are important tests of the Standard Model and beyond Standard Model physics, particularly for the electron and the muon. However, the situation presents distinctive challenges when dealing with the tau lepton due to its very short lifetime and relatively high mass. Here, we review the theoretical predictions and experimental measurements of both the anomalous magnetic and electric dipole moments of the tau lepton.

• Lepton flavor violation with tau leptons

  Julian Heeck

  SciPost Phys. Proc. 17, 005 (2025) · published 23 July 2025 | Toggle abstract · pdf

  We review the status and importance of lepton flavor violation with tauons, focusing on overlooked flavor-breaking patterns as well as tau-flavor violation in nucleon decays.

• Leptophilic portals to new physics at colliders

  P. S. Bhupal Dev

  SciPost Phys. Proc. 17, 007 (2025) · published 23 July 2025 | Toggle abstract · pdf

  Observed neutrino oscillations imply that the global lepton flavor symmetry of the Standard Model must be broken. Therefore, searches for lepton flavor violation (LFV) are promising probes of new physics beyond the Standard Model. High-energy colliders provide a powerful tool to study LFV effects, which are complementary to the low-energy charged LFV searches. Here we discuss the possibility of LFV signals at colliders arising from exotic Higgs decays, and from leptophilic scalar and vector portal scenarios.

• Matter effect in $P_{\mu \tau}$ at long baselines

  Srubabati Goswami, Supriya Pan, Animesh Chatterjee

  SciPost Phys. Proc. 17, 017 (2025) · published 23 July 2025 | Toggle abstract · pdf

  In the simple two-generation case, the probability $P_{\mu \tau}$ is not affected by interactions of neutrinos in matter. But for three-generation case, at baselines of the order of 9000 km, matter effects become important for this channel. This is a genuine three-flavour effect. We study how the presence of non-standard interactions (NSI) alters the $P_{\mu \tau}$ at these baselines. We observe large deviations from the standard matter effect. In particular, we find energies and baselines for which the phases governing the NSIs do not play any role. This may facilitate a better determination of NSI parameters if tau neutrinos can be detected.

• Tau data-based evaluations of the hadronic vacuum polarization contribution to the muon g-2

  Pere Masjuan, Alejandro Miranda, Pablo Roig

  SciPost Phys. Proc. 17, 023 (2025) · published 23 July 2025 | Toggle abstract · pdf

  We review the $\tau$ data-driven computation of Euclidean windows for the hadronic vacuum polarization contribution to the muon anomalous magnetic moment ($a_\mu$), which agree with the lattice results, making the difference of the $e^+e^-$ data-driven methods with them more intriguing. This conundrum needs to be solved by next year, when the final FNAL $a_\mu$ measurement will be published, in order to extract firm conclusions on possible new physics effects.

• State-of-the-art cross sections for $t\bar t H$: NNLO predictions matched with NNLL resummation and EW corrections

  Roger Balsach, Alessandro Broggio, Simone Devoto, Andrea Ferroglia, Rikkert Frederix, Massimiliano Grazzini, Stefan Kallweit, Anna Kulesza, Javier Mazzitelli, Leszek Motyka, Davide Pagani, Benjamin D. Pecjak, Chiara Savoini, Tomasz Stebel, Malgorzata Worek, Marco Zaro

  SciPost Phys. Comm. Rep. 10 (2025) · published 13 August 2025 | Toggle abstract · pdf

  We present new, state-of-the-art predictions for the associated production of the SM Higgs boson with top quarks, computed in accordance with the recommendations of the LHC Higgs Working Group. The NNLO QCD predictions, derived through suitable approximations of the two-loop virtual contribution, are supplemented with soft-gluon resummation up to NNLL accuracy. Two distinct resummation frameworks are employed – one based on direct QCD and the other on soft-collinear effective theory – and their features are compared in detail. These results are further combined with the complete-NLO corrections, yielding the most precise SM predictions for this process to date. The relevant sources of theoretical uncertainties are thoroughly estimated and discussed.