Constraints on nuclear parton distributions from dijet photoproduction at the LHC

V. Guzey, M. Klasen

Research output: Contribution to journalArticleScientificpeer-review

Abstract

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 xA. Taking the error to be 5%, the uncertainty of nCTEQ15 and nCTEQ15np nPDFs reduces approximately by a factor of two at xA=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.
Original languageEnglish
Article number396
JournalEuropean Physical Journal C. Particles and Fields
Volume79
Issue number5
Number of pages10
ISSN1434-6044
DOIs
Publication statusPublished - 8 May 2019
MoE publication typeA1 Journal article-refereed

Fields of Science

  • PB-PB COLLISIONS
  • VECTOR-MESONS
  • COLLIDER
  • 114 Physical sciences

Cite this

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title = "Constraints on nuclear parton distributions from dijet photoproduction at the LHC",
abstract = "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 xA. Taking the error to be 5{\%}, the uncertainty of nCTEQ15 and nCTEQ15np nPDFs reduces approximately by a factor of two at xA=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.",
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Constraints on nuclear parton distributions from dijet photoproduction at the LHC. / Guzey, V.; Klasen, M.

In: European Physical Journal C. Particles and Fields, Vol. 79, No. 5, 396, 08.05.2019.

Research output: Contribution to journalArticleScientificpeer-review

TY - JOUR

T1 - Constraints on nuclear parton distributions from dijet photoproduction at the LHC

AU - Guzey, V.

AU - Klasen, M.

PY - 2019/5/8

Y1 - 2019/5/8

N2 - 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 xA. Taking the error to be 5%, the uncertainty of nCTEQ15 and nCTEQ15np nPDFs reduces approximately by a factor of two at xA=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.

AB - 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 xA. Taking the error to be 5%, the uncertainty of nCTEQ15 and nCTEQ15np nPDFs reduces approximately by a factor of two at xA=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.

KW - PB-PB COLLISIONS

KW - VECTOR-MESONS

KW - COLLIDER

KW - 114 Physical sciences

U2 - 10.1140/epjc/s10052-019-6905-2

DO - 10.1140/epjc/s10052-019-6905-2

M3 - Article

VL - 79

JO - European Physical Journal C. Particles and Fields

JF - European Physical Journal C. Particles and Fields

SN - 1434-6044

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