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Title Collinear Factorization in Wide-Angle Hadron Pair Production in $e^+e^-$ Annihilation
Authors Ted Rogers,Nobuo Sato Gonzalez,Eric Moffat,Andrea Signori
JLAB number JLAB-THY-19-3020
LANL number arXiv:1909.02951
Other number DOE/OR/23177-4766
Document Type(s) (Journal Article) 
Supported by U.S. Naval Research: No
Supported by Jefferson Lab LDRD Funding: No
Funding Source: Nuclear Physics (NP)
Other Funding:DOE, Award Number DE-SC0018106.
DOE, contract no. DE-AC02-06CH11357.

Compiled for Physical Review D
Volume 100
Page(s) 094014
Publication Abstract: We compute the inclusive unpolarized dihadron production cross section in the far from back-to-back region of $e^+ e^-$ annihilation in leading order pQCD using existing fragmentation function fits and standard collinear factorization, focusing on the large transverse momentum region where transverse momentum is comparable to the hard scale (the center-of-mass energy). We compare with standard transverse-momentum-dependent (TMD) fragmentation function-based predictions intended for the small transverse momentum region with the aim of testing the expectation that the two types of calculation roughly coincide at intermediate transverse momentum. We find significant tension, within the intermediate transverse momentum region, between calculations done with existing non-perturbative TMD fragmentation functions and collinear factorization calculations if the center-of-mass energy is not extremely large. We argue that $e^+ e^-$ measurements are ideal for resolving this tension and exploring the large-to-small transverse momentum transition, given the typically larger hard scales ($\gtrsim 12$~GeV) of the process as compared with similar scenarios that arise in semi-inclusive deep inelastic scattering and fixed-target Drell-Yan measurements.
Experiment Numbers: other
Document: pdf
Accepted Manuscript: PhysRevD.100.094014.pdf
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