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Secondly, variations of the choices made for the PDF input parametrisation are considered.

Finally, variations associated to different methodological choices in the fitting procedure are quantified. The following variations have been considered: The curves are indistinguishable because they overlap due to their negligible impact on photon PDF fit. Only the impact of the variation of the strange fraction assumption is visible by eye. See text for more details of these variations First the impact of uncertainties associated to either the choice of input physical parameters or of specific settings adopted in the fit is considered. The results of Fig. As before, all variations are contained within the experimental PDF uncertainty bands, though the impact of the parametrisation variations is typically larger than that of Adata PD3-X mas model variations: A cross-check of the robustness of the estimated experimental uncertainty of the photon PDF in this analysis is provided by the comparison of the Monte Carlo and Hessian methods.

In particular, the central values of the photon obtained with the two fitting techniques are quite similar to each other.

The parametrisation variations that have been explored are: To study this, Fig. In other words, the QED part of the calculations is identical in both cases.

  • The photon PDF from high-mass Drell–Yan data at the LHC SpringerLink
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From the comparison of Fig. The findings indicate that a direct determination of the photon PDF from hadron collider data Adata PD3-X mas still far from being competitive with the LUXqed and HKR calculations, which are based instead on precise measurements of the inclusive DIS structure functions of the proton. Moreover, our results illustrate the flexibility of the xFitter framework to extend its capabilities beyond the traditional quark and gluon PDF fits. All these technical improvements will certainly be helpful for future studies of the photon content of the proton.

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Notes Acknowledgements We thank L. We thank A.


Sapronov for providing support to the xFitter platform. We thank P.

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Starovoitov for discussions related to the APPLgrid files. We thank M.

Dyndal for discussions on the scale choices for the photon-induced contributions. The work of V.

The photon PDF from high-mass Drell–Yan data at the LHC

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