ManeParse

nCTEQ15WZ+SIH results:

Grids:

nCTEQ15WZ+SIH bound proton grids:

Full PDF uncertainty sets: here (93 Mb)
Mathematica ManeParse Testing Code for nCTEQ15WZSIH: here (4.3 Mb)

nCTEQ15WZ+SIH_FullNuc full nucleus grids (Z f_p + N f_n)/A

Full PDF uncertainty sets: here (93 Mb)

doQcdCase Bash Script: Some older grids had a typo in the .info file: "OrderQcd" should be "OrderQCD" The zip files have been updated, but this bash script will fix older files.

If you use any of the grids provided here, please cite

nCTEQ15WZ+SIH: "Impact of inclusive hadron production data on nuclear gluon PDFs"
nCTEQ Collaboration: P. Duwentaster, L. A. Husova, T. Jezo, M. Klasen, K. Kovarik, A. Kusina, K. F. Muzakka, F. I. Olness, I. Schienbein, J. Y. Yu
arXiv:2105.09873
https://doi.org/10.1103/PhysRevD.104.094005

A precise knowledge of nuclear parton distribution functions (nPDFs) is -- among other things -- important for the unambiguous interpretation of hard process data taken in pA and AA collisions at the Relativistic Heavy Ion Collider (RHIC) and the Large Hadron Collider (LHC). The available fixed target data for deep inelastic scattering (DIS) and Drell-Yan (DY) lepton pair production mainly constrain the light quark distributions. It is hence crucial to include more and more collider data in global analyses of nPDFs in order to better pin down the different parton flavors, in particular the gluon distribution at small x. To help constrain the nuclear gluon PDF, we extend the nCTEQ15 analysis by including single inclusive hadron (SIH) production data from RHIC (PHENIX and STAR) and LHC (ALICE). In addition to the DIS, DY and SIH data sets, we will also include LHC W/Z production data. As the SIH calculation is dependent on hadronic fragmentation functions (FFs), we use a variety of FFs available in the literature to properly estimate this source of uncertainty. We study the impact of these data on the PDFs, and compare with both the nCTEQ15 and nCTEQ15WZ sets. The calculations are performed using a new implementation of the nCTEQ code (nCTEQ++) including a modified version of INCNLO which allows faster calculations using pre-computed grids. The extension of the nCTEQ15 analysis to include the SIH data represents an important step toward the next generation of PDFs.

Fractional Contributions

Fractions

nCTEQ PDFs

nCTEQ PDFs

PDF Comparison

PDF Correlations

for comments or requests contact K.Kovarik karol.kovarik@uni-muenster.de
                                 F.Olness  olness@smu.edu