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Title: Measurements of Normalized Differential Cross Sections of Inclusive η Production in e + e Annihilation at Energy from 2.0000 to 3.6710 GeV

Journal Article · · Physical Review Letters
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Using data samples collected with the BESIII detector operating at the BEPCII storage ring, the cross section of the inclusive process e + e η + X , normalized by the total cross section of e + e hadrons , is measured at eight center-of-mass energy points from 2.0000 to 3.6710 GeV. These are the first measurements with momentum dependence in this energy region. Our measurement shows a significant discrepancy compared to the existing fragmentation functions. To address this discrepancy, a new QCD analysis is performed at the next-to-next-to-leading order with hadron mass corrections and higher twist effects, which can explain both the established high-energy data and our measurements reasonably well. Published by the American Physical Society 2024

Sponsoring Organization:
USDOE
Grant/Contract Number:
FG02-05ER41374
OSTI ID:
2396408
Journal Information:
Physical Review Letters, Journal Name: Physical Review Letters Journal Issue: 2 Vol. 133; ISSN 0031-9007; ISSN PRLTAO
Publisher:
American Physical SocietyCopyright Statement
Country of Publication:
United States
Language:
English

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