Speaker
Description
We present an update to our SIDIS-based approach for dimuon production in neutrino-nucleus collisions [1]. Dimuon production, an important constraint for the strange-quark distribution in global analyses of both proton and nuclear parton distributions, has traditionally been calculated by assuming factorization to the inclusive DIS charm production process. In our approach, we forego this assumption and instead compute dimuon production directly using semi-inclusive DIS and charged-hadron fragmentation functions. Our updated next-to-leading-order framework now includes full charm-quark mass corrections in a variable flavor number scheme. We assess the impact of these corrections and the effect they have on the agreement with NuTeV and CCFR dimuon data. We find that in the region of small momentum transfer, where the mass effects are the most impactful, the cross section values are reduced by up to 20%.
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]
