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<p>We examine hadron multiplicity fluctuations in hard processes and confront analytic QCD predictions with the pattern of multiplicity fluctuations observed in <i>e</i><sup>+</sup><i>e</i><sup>−</sup> annihilation and high-<i>p</i><sub><i>t</i></sub> jets produced in <i>pp</i> collisions at the LHC. Special emphasis is placed on high-multiplicity fluctuations in jets. Selecting events with hadronic multiplicity exceeding the average value by a factor of 3 or more in various processes has been a source of conundrums for many years. We discuss two recent high-multiplicity puzzles and attempt to reveal their common origin.</p>

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Hadron multiplicity fluctuations in perturbative QCD

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2025年8月21日

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  • Yu. L. Dokshitzer,
  • B. R. Webber

摘要

We examine hadron multiplicity fluctuations in hard processes and confront analytic QCD predictions with the pattern of multiplicity fluctuations observed in e+e− annihilation and high-pt jets produced in pp collisions at the LHC. Special emphasis is placed on high-multiplicity fluctuations in jets. Selecting events with hadronic multiplicity exceeding the average value by a factor of 3 or more in various processes has been a source of conundrums for many years. We discuss two recent high-multiplicity puzzles and attempt to reveal their common origin.