Speaker
Description
Dimuon production in neutrino-nucleus collisions remains an important constraint of strangeness in nucleons. In most global analyses of proton and nuclear parton distribution functions, dimuon production is computed by assuming factorization to inclusive charm DIS production, an assumption that is valid only at leading order in the fixed-flavor number scheme. Our approach based on semi-inclusive DIS foregoes this assumption. We present an update to our framework [1, 2], where we take the SIDIS calculation to NNLO precision, the forefront in nuclear PDF analyses. We find that the NNLO calculation decreases the scale uncertainty in comparison to our previous NLO calculation indicating good perturbative convergence. We also see that the cross section values are modified by up to 10-20% relative to the NLO calculation in a wide kinematical range, including at small and moderate values of momentum transfer, and in the valence region and smaller values of Björken-$x$.
References:
[1] I. Helenius, H. Paukkunen and S. Yrjänheikki: Dimuons from neutrino-nucleus collisions in the semi-inclusive DIS approach, JHEP 09 (2024) 043 [arXiv:2405.12677]
[2] I. Helenius, H. Paukkunen and S. Yrjänheikki: Improving the description of dimuon production in neutrino-nucleus collisions using the SACOT-$\chi$ scheme, JHEP 01 (2026) 112 [arXiv:2506.09492]
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