Measurements of Normalized Differential Cross Sections of Inclusive η Production in e
Phys Rev Lett
; 133(2): 021901, 2024 Jul 12.
Article
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| MEDLINE
| ID: mdl-39073971
ABSTRACT
Using data samples collected with the BESIII detector operating at the BEPCII storage ring, the cross section of the inclusive process e^{+}e^{-}âη+X, normalized by the total cross section of e^{+}e^{-}âhadrons, 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.
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01-internacional
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MEDLINE
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En
Revista:
Phys Rev Lett
Año:
2024
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Article