Abstract
We provide a comprehensive comparison of W^pm / Z vector boson production data in pPb and PbPb collisions at the LHC with predictions obtained using the nCTEQ15 PDFs. We identify the measurements which have the largest potential impact on the PDFs, and estimate the effect of including these data using a Bayesian reweighting method. We find this data set can provide information as regards both the nuclear corrections and the heavy flavor (strange quark) PDF components. As for the proton, the parton flavor determination/separation is dependent on nuclear corrections (from heavy target DIS, for example), this information can also help improve the proton PDFs.
Highlights
The LHC heavy ion W ±/Z data set is especially interesting as it can help to resolve the long-standing dilemma regarding the heavy flavor components of the proton PDFs
We provide a comprehensive comparison of W ±/Z vector boson production data in pPb and PbPb collisions at the LHC with predictions obtained using the nCTEQ15 PDFs
We have presented a comprehensive study of vector boson production (W ±, Z ) from lead collisions at the LHC
Summary
For the theoretical calculations in our study we use the FEWZ (Fully Exclusive W, Z production) [22,23] program version 2.1. This low x2 range is unconstrained by the data currently used in nPDF fits, so these results come from an extrapolation of the larger x2 region. The ALICE data (Fig. 8) currently have large uncertainties, and we expect they will have a minimal impact on the reweighting
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