6533b82bfe1ef96bd128cdd2
RESEARCH PRODUCT
Constraints on nuclear parton distributions from dijet photoproduction at the LHC
Michael KlasenVadim GuzeyVadim GuzeyVadim Guzeysubject
PB-PB COLLISIONSParticle physicsNuclear TheoryPhysics and Astronomy (miscellaneous)FOS: Physical scienceslcsh:AstrophysicsPartonhiukkasfysiikka114 Physical sciences01 natural sciencesCOLLIDERNuclear Theory (nucl-th)MomentumCross section (physics)High Energy Physics - Phenomenology (hep-ph)lcsh:QB460-4660103 physical scienceslcsh:Nuclear and particle physics. Atomic energy. RadioactivityQuantum ChromodynamicsNuclear Experiment (nucl-ex)010306 general physicsNuclear ExperimentEngineering (miscellaneous)PhysicsQuantum chromodynamicsLarge Hadron Collider010308 nuclear & particles physicsHigh Energy Physics - Phenomenologynuclear parton distribution functionsDistribution functionlcsh:QC770-798ydinfysiikkaVECTOR-MESONSParametrizationdescription
Using QCD calculations of the cross section of inclusive dijet photoproduction in Pb-Pb ultraperipheral collisions in the LHC kinematics as pseudo-data, we study the effect of including these data using the Bayesian reweighting technique on nCTEQ15, nCTEQ15np, and EPPS16 nuclear parton distribution functions (nPDFs). We find that, depending on the assumed error of the pseudo-data, it leads to a significant reduction of the nPDF uncertainties at small values of the momentum fraction $x_A$. Taking the error to be 5\%, the uncertainty of nCTEQ15 and nCTEQ15np nPDFs reduces approximately by a factor of two at $x_A=10^{-3}$. At the same time, the reweighting effect on EPPS16 nPDFs is much smaller due to the higher value of the tolerance and a more flexible parametrization form.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2019-05-01 |