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Title: Fragmentation functions beyond fixed order accuracy

Journal Article · · Physical Review D
 [1];  [2];  [2];  [3]
  1. The Univ. of Manchester, Manchester (United Kingdom)
  2. Univ. of Tubingen, Tubingen (Germany)
  3. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)

Here, we give a detailed account of the phenomenology of all-order resummations of logarithmically enhanced contributions at small momentum fraction of the observed hadron in semi-inclusive electron-positron annihilation and the timelike scale evolution of parton-to-hadron fragmentation functions. The formalism to perform resummations in Mellin moment space is briefly reviewed, and all relevant expressions up to next-to-next-to-leading logarithmic order are derived, including their explicit dependence on the factorization and renormalization scales. We discuss the details pertinent to a proper numerical implementation of the resummed results comprising an iterative solution to the timelike evolution equations, the matching to known fixed-order expressions, and the choice of the contour in the Mellin inverse transformation. First extractions of parton-to-pion fragmentation functions from semi-inclusive annihilation data are performed at different logarithmic orders of the resummations in order to estimate their phenomenological relevance. To this end, we compare our results to corresponding fits up to fixed, next-to-next-to-leading order accuracy and study the residual dependence on the factorization scale in each case.

Research Organization:
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Sponsoring Organization:
USDOE
Grant/Contract Number:
AC52-06NA25396; 2012LANL7033
OSTI ID:
1460626
Alternate ID(s):
OSTI ID: 1345854
Report Number(s):
LA-UR-16-27763; PRVDAQ; TRN: US1901881
Journal Information:
Physical Review D, Vol. 95, Issue 5; ISSN 2470-0010
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 21 works
Citation information provided by
Web of Science

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Cited By (2)

First determination of D * -meson fragmentation functions and their uncertainties at next-to-next-to-leading order journal April 2018
First determination of $D^{*+}$-meson fragmentation functions and their uncertainties at next-to-next-to-leading order text January 2017

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