Number Density Interpretation of Dihadron Fragmentation Functions

D. Pitonyak, C. Cocuzza, A. Metz, A. Prokudin, N. Sato

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We present a new quantum field-theoretic definition of fully unintegrated dihadron fragmentation functions (DiFFs) as well as a generalized version for n-hadron fragmentation functions. We demonstrate that this definition allows certain sum rules to be satisfied, making it consistent with a number density interpretation. Moreover, we show how our corresponding so-called extended DiFFs that enter existing phenomenological studies are number densities and also derive their evolution equations. Within this new framework, DiFFs extracted from experimental measurements will have a clear physical meaning.

Original languageEnglish (US)
Article number011902
JournalPhysical review letters
Issue number1
StatePublished - Jan 5 2024

All Science Journal Classification (ASJC) codes

  • General Physics and Astronomy

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