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Number Density Interpretation of Dihadron Fragmentation Functions
Pitonyak, D. Cocuzza, C. Metz, Andreas Prokudin, A. Sato, N.
Pitonyak, D.
Cocuzza, C.
Metz, Andreas
Prokudin, A.
Sato, N.
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Journal article
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2024-01-04
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Physics
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https://doi.org/10.1103/physrevlett.132.011902
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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.
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Physical Review Letters, Vol. 132, Iss. 1
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