Regular Article - Theoretical Physics
Maximally entangled proton and charged hadron multiplicity in Deep Inelastic Scattering
Departamento de Actuaria, Física y Matemáticas, Universidad de las Americas Puebla, 72820, San Andrés Cholula, Puebla, Mexico
2 Institute of Nuclear Physics, Polish Academy of Sciences, ul. Radzikowskiego 152, 31-342, Kraków, Poland
3 Physics Department, Brookhaven National Laboratory, Bldg. 510A, 20 Pennsylvania Street, 30-059, 11973, Upton, NY, USA
4 AGH University of Science and Technology, Kraków, Poland
Accepted: 8 December 2022
Published online: 19 December 2022
We study the proposal by Kharzeev–Levin to determine entanglement entropy in Deep Inelastic Scattering (DIS) from parton distribution functions (PDFs) and to relate the former to the entropy of final state hadrons. We find several uncertainties in the current comparison to data, in particular the overall normalization, the relation between charged versus total hadron multiplicity in the comparison to experimental results as well as different methods to determine the number of partons in Deep Inelastic Scattering. We further provide a comparison to data based on leading order HERA PDF as well as PDFs obtained from an unintegrated gluon distribution subject to next-to-leading order Balitsky–Fadin–Kuraev–Lipatov and Balitsky–Kovchegov evolution. Within uncertainties we find good agreement with H1 data. We provide also predictions for entropy at lower photon virtualities, where non-linear QCD dynamics is expected to become relevant.
© The Author(s) 2022
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