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Abstract <p>In this work we use the Soft Gluon Resummation approach as a noncollinear factorization model to describe polarisation of <InlineEquation ID="IEq1"> <EquationSource Format="TEX">\(J{\text{/}}\psi \)</EquationSource> <!--PhysPNLt2570091Saleev-m1--> </InlineEquation> within NRQCD as a hadronization model. We extract nonperturbative LDME for octet color states of charmonium by fitting them to unpolarised <InlineEquation ID="IEq2"> <EquationSource Format="TEX">\(J{\text{/}}\psi \)</EquationSource> <!--PhysPNLt2570091Saleev-m2--> </InlineEquation> production data of PHENIX and STAR collaborations at <InlineEquation ID="IEq3"> <EquationSource Format="TEX">\(\sqrt s = 200\)</EquationSource> <!--PhysPNLt2570091Saleev-m3--> </InlineEquation> GeV. We make prediction for an angular coefficient <InlineEquation ID="IEq4"> <EquationSource Format="TEX">\(\lambda \)</EquationSource> <!--PhysPNLt2570091Saleev-m4--> </InlineEquation> as a polarisation indicator for <InlineEquation ID="IEq5"> <EquationSource Format="TEX">\(J{\text{/}}\psi \)</EquationSource> <!--PhysPNLt2570091Saleev-m5--> </InlineEquation> in the helicity frame and compare it with the PHENIX polarisation data.</p>

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Small-pT Production of Polarised J/ψ Mesons within the Soft Gluon Resummation Approach

  • 期刊论文

  • 发表日期：

    2025年10月3日

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  • V. A. Saleev,
  • K. K. Shilyaev

摘要

Abstract

In this work we use the Soft Gluon Resummation approach as a noncollinear factorization model to describe polarisation of \(J{\text{/}}\psi \) within NRQCD as a hadronization model. We extract nonperturbative LDME for octet color states of charmonium by fitting them to unpolarised \(J{\text{/}}\psi \) production data of PHENIX and STAR collaborations at \(\sqrt s = 200\) GeV. We make prediction for an angular coefficient \(\lambda \) as a polarisation indicator for \(J{\text{/}}\psi \) in the helicity frame and compare it with the PHENIX polarisation data.