A new generation of experiments is expected to shed light on the elusive parton structure of the bound proton. One of the most promising directions is incoherent deeply virtual Compton scattering, which can provide a tomographic view of the bound proton. The first measurement has been recently performed, using He4 targets at Jefferson Lab. In the work presented here, a rigorous impulse approximation analysis of this process is proposed. As ingredients, state-of-the-art models of the nuclear spectral function and of the parton structure of the struck proton, together with novel scattering amplitudes expressions for a bound moving nucleon, have been used. The overall agreement obtained with the data, good in particular at high values of the photon virtuality, demonstrates the solidity of the framework, which is also suitable for further improvements. It is found that possible big differences between results for the bound proton and those for the free one could be related to kinematical nuclear effects and not to modifications of the parton structure. The analysis demonstrates that the comparison of the results of this approach, based on a conventional description, with future precise data, has the potential to expose exotic quark and gluon effects in nuclei.
Catching a glimpse of the parton structure of the bound proton
Fucini S.;Scopetta S.
;
2020
Abstract
A new generation of experiments is expected to shed light on the elusive parton structure of the bound proton. One of the most promising directions is incoherent deeply virtual Compton scattering, which can provide a tomographic view of the bound proton. The first measurement has been recently performed, using He4 targets at Jefferson Lab. In the work presented here, a rigorous impulse approximation analysis of this process is proposed. As ingredients, state-of-the-art models of the nuclear spectral function and of the parton structure of the struck proton, together with novel scattering amplitudes expressions for a bound moving nucleon, have been used. The overall agreement obtained with the data, good in particular at high values of the photon virtuality, demonstrates the solidity of the framework, which is also suitable for further improvements. It is found that possible big differences between results for the bound proton and those for the free one could be related to kinematical nuclear effects and not to modifications of the parton structure. The analysis demonstrates that the comparison of the results of this approach, based on a conventional description, with future precise data, has the potential to expose exotic quark and gluon effects in nuclei.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
