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Impact of LHC vector boson production in heavy ion collisions on strange PDFs

The European physical journal. C, Particles and fields, 2020-10, Vol.80 (10), p.1-21, Article 968 [Peer Reviewed Journal]

The Author(s) 2020 ;COPYRIGHT 2020 Springer ;The Author(s) 2020. This work is published under http://creativecommons.org/licenses/by/4.0/ (the “License”). Notwithstanding the ProQuest Terms and Conditions, you may use this content in accordance with the terms of the License. ;Distributed under a Creative Commons Attribution 4.0 International License ;ISSN: 1434-6044 ;EISSN: 1434-6052 ;DOI: 10.1140/epjc/s10052-020-08532-4

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Title:
Impact of LHC vector boson production in heavy ion collisions on strange PDFs
Author: Kusina, A. ; Ježo, T. ; Clark, D. B. ; Duwentäster, P. ; Godat, E. ; Hobbs, T. J. ; Kent, J. ; Klasen, M. ; Kovařík, K. ; Lyonnet, F. ; Muzakka, K. F. ; Olness, F. I. ; Schienbein, I. ; Yu, J. Y.
Subjects: Astronomy ; Astrophysics and Cosmology ; Collisions (Nuclear physics) ; Comparative analysis ; Distribution (Probability theory) ; Distribution functions ; Elementary Particles ; Flavor (particle physics) ; Hadrons ; Heavy Ions ; High Energy Physics - Phenomenology ; Inelastic scattering ; Ionic collisions ; Large Hadron Collider ; LHC heavy ion physics ; Measurement Science and Instrumentation ; Neutrinos ; Nuclear Energy ; nuclear parton distribution function ; Nuclear Physics ; NUCLEAR PHYSICS AND RADIATION PHYSICS ; Nuclei (nuclear physics) ; Partons ; Physics ; Physics and Astronomy ; PHYSICS OF ELEMENTARY PARTICLES AND FIELDS ; Protons ; quantum chromodynamics ; Quantum Field Theories ; Quantum Field Theory ; Quarks ; Regular Article - Theoretical Physics ; String Theory
Is Part Of: The European physical journal. C, Particles and fields, 2020-10, Vol.80 (10), p.1-21, Article 968
Description: The extraction of the strange quark parton distribution function (PDF) poses a long-standing puzzle. Measurements from neutrino-nucleus deep inelastic scattering (DIS) experiments suggest the strange quark is suppressed compared to the light sea quarks, while recent studies of W ± / Z boson production at the LHC imply a larger strange component at small x values. As the parton flavor determination in the proton depends on nuclear corrections, e.g. from heavy-target DIS, LHC heavy ion measurements can provide a distinct perspective to help clarify this situation. In this investigation we extend the nCTEQ15 nPDFs to study the impact of the LHC proton-lead W ± / Z production data on both the flavor differentiation and nuclear corrections. This complementary data set provides new insights on both the LHC W ± / Z proton analyses and the neutrino-nucleus DIS data. We identify these new nPDFs as nCTEQ15WZ . Our calculations are performed using a new implementation of the nCTEQ code ( nCTEQ++ ) based on C++ which enables us to easily interface to external programs such as HOPPET, APPLgrid and MCFM. Our results indicate that, as suggested by the proton data, the small x nuclear strange sea appears larger than previously expected, even when the normalization of the W ± / Z data is accommodated in the fit. Extending the nCTEQ15 analysis to include LHC W ± / Z data represents an important step as we advance toward the next generation of nPDFs.
Publisher: Berlin/Heidelberg: Springer Berlin Heidelberg
Language: English
Identifier: ISSN: 1434-6044
EISSN: 1434-6052
DOI: 10.1140/epjc/s10052-020-08532-4
Source: Springer Open Access Journals
ProQuest Central
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Impact of LHC vector boson production in heavy ion collisions on strange PDFs

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