Number Density Interpretation of Dihadron Fragmentation Functions

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 d...

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Bibliographic Details
Published in:Physical review letters 2024-01, Vol.132 (1), p.011902-011902, Article 011902
Main Authors: Pitonyak, D, Cocuzza, C, Metz, A, Prokudin, A, Sato, N
Format: Article
Language:English
Subjects:
fragmentation functions
NUCLEAR PHYSICS AND RADIATION PHYSICS
quantum chromodynamics
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Summary: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.
ISSN:0031-9007
1079-7114
DOI:10.1103/PhysRevLett.132.011902