Recent results from STAR for parton distribution functions at low and high \(x\) in proton-proton collisions

Recent results from STAR for parton distribution functions at low and high \(x\) in proton-proton collisions

According to perturbative quantum chromodynamic calculations, in \(pp\) collisions at \(\sqrt{s} = \)~200 and 510 GeV studied at RHIC, jet production in mid-pseudorapidity, \(|\eta|

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Veröffentlicht in:arXiv.org 2024-11
Hauptverfasser: Chang, Zilong, the STAR collaboration
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Sprache:eng
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Collisions
Cross-sections
Distribution functions
Gluons
Nonlinear dynamics
Partons
Protons
Quantum chromodynamics
Quarks
Relativistic Heavy Ion Collider
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description According to perturbative quantum chromodynamic calculations, in \(pp\) collisions at \(\sqrt{s} = \)~200 and 510 GeV studied at RHIC, jet production in mid-pseudorapidity, \(|\eta|
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Therefore jets at RHIC are direct probes of the gluon parton distribution functions (PDFs) for momentum fractions 0.01 \(&lt;x&lt;\) 0.5. Moreover, \(W\) boson cross section ratio, \(\sigma(W^+)/\sigma(W^-)\), in \(pp\) collisions at \(\sqrt{s} = 510\)~GeV, is an effective tool to explore anti-quark PDFs, \(\bar{d}/\bar{u}\). Last but not least, di-\(\pi^{0}\) correlation in forward pseudorapidity, \(2.6 &lt; \eta &lt;4.0\), is an important indication of the non-linear gluon dynamics at low \(x\) where the gluon density is high in protons and nuclei. In this proceeding, we present recent STAR results of mid-pseudorapidity inclusive jet cross-sections at \(\sqrt{s} =\)~200 and 510 GeV in \(pp\) collisions, \(W\) boson cross-section ratios at \(\sqrt{s} = 510\)~GeV in \(pp\) collisions, and forward di-\(\pi^0\) correlations in \(pp\), \(p\textrm{Al}\) and \(p\textrm{Au}\) collisions at \(\sqrt{s_{\textrm{\tiny NN}}} = 200\)~GeV.</description><identifier>EISSN: 2331-8422</identifier><language>eng</language><publisher>Ithaca: Cornell University Library, arXiv.org</publisher><subject>Collisions ; Cross-sections ; Distribution functions ; Gluons ; Nonlinear dynamics ; Partons ; Protons ; Quantum chromodynamics ; Quarks ; Relativistic Heavy Ion Collider</subject><ispartof>arXiv.org, 2024-11</ispartof><rights>2024. This work is published under http://creativecommons.org/licenses/by-nc-nd/4.0/ (the “License”). 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Therefore jets at RHIC are direct probes of the gluon parton distribution functions (PDFs) for momentum fractions 0.01 \(&lt;x&lt;\) 0.5. Moreover, \(W\) boson cross section ratio, \(\sigma(W^+)/\sigma(W^-)\), in \(pp\) collisions at \(\sqrt{s} = 510\)~GeV, is an effective tool to explore anti-quark PDFs, \(\bar{d}/\bar{u}\). Last but not least, di-\(\pi^{0}\) correlation in forward pseudorapidity, \(2.6 &lt; \eta &lt;4.0\), is an important indication of the non-linear gluon dynamics at low \(x\) where the gluon density is high in protons and nuclei. 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subjects Collisions
Cross-sections
Distribution functions
Gluons
Nonlinear dynamics
Partons
Protons
Quantum chromodynamics
Quarks
Relativistic Heavy Ion Collider
title Recent results from STAR for parton distribution functions at low and high \(x\) in proton-proton collisions
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