HEP2025: 41st Conference on Recent Developments in High Energy Physics and Cosmology [NKUA]

Session

Session 8

3 Jul 2025, 11:30

“Alkis Argyriadis” Amphitheatre (National and Kapodistrian University of Athens)

Conveners

Session 8

• Costas Papadopoulos (NCSR "Demokritos")

46. Positive Geometry in Particle Physics and Cosmology

Johannes Henn (Max Planck Institute for Physics, Munich)

03/07/2025, 11:30

10. New physics implications from the first CEvNS observation using solar $^8$B neutrinos

Dr Dimitrios Papoulias (IFIC (CSIC/Valencia U.))

03/07/2025, 12:15

I will discuss the implications of the first observation of coherent elastic neutrino–nucleus scattering (CEνNS) induced by $^8$B solar neutrinos in dark matter direct detection experiments. By analyzing recent CEvNS data from the XENONnT and PandaX-4T collaborations, I will present new constraints on novel neutrino interactions and non-trivial electromagnetic properties.

23. Towards numerical two-loop integrand reduction

Giuseppe Bevilacqua (NCSR Demokritos)

03/07/2025, 12:45

We present a method for the integrand-level reduction of two-loop helicity amplitudes in both d=4−2ϵ and d=4 dimensions. The amplitude is expressed in terms of a set of Feynman integrals and their coefficients that depend on the external kinematics. The method presented in this talk, in conjunction with the ongoing development of the computational framework HELAC-2LOOP, paves the road for the...