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The heavy-quark symmetry of Non-Relativistic Quantum Chromodynamics (NRQCD) allows to generate the predictions of the cross-section for \(\eta _c\) production. However, when compared to LHCb data, the NRQCD predictions fail significantly. In contrast, modified NRQCD offers a neat solution to the \(\eta _c\) anomaly observed by the LHCb, successfully explaining all aspects of the \(\eta _c\) data. We also compare recent LHCb measurements of the integrated cross-section for \(h_c\) production at \(\sqrt{s}\) = 13 TeV to theoretical predictions based on both NRQCD and modified NRQCD models. The modified NRQCD approach shows good agreement with the recent LHCb data.

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Understanding Charmonia Production at the LHC: Insights from Proton-Proton Collisions

  • 会议论文

  • 发表日期：

    2025年

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  • Sudhansu S. Biswal,
  • Sushree S. Mishra,
  • K. Sridhar

摘要

The heavy-quark symmetry of Non-Relativistic Quantum Chromodynamics (NRQCD) allows to generate the predictions of the cross-section for \(\eta _c\) production. However, when compared to LHCb data, the NRQCD predictions fail significantly. In contrast, modified NRQCD offers a neat solution to the \(\eta _c\) anomaly observed by the LHCb, successfully explaining all aspects of the \(\eta _c\) data. We also compare recent LHCb measurements of the integrated cross-section for \(h_c\) production at \(\sqrt{s}\) = 13 TeV to theoretical predictions based on both NRQCD and modified NRQCD models. The modified NRQCD approach shows good agreement with the recent LHCb data.