TY - JOUR
T1 - Measurements of Normalized Differential Cross Sections of Inclusive η Production in e+e- Annihilation at Energy from 2.0000 to 3.6710 GeV
AU - BESIII Collaboration
AU - Ablikim, M.
AU - Achasov, M. N.
AU - Adlarson, P.
AU - Ai, X. C.
AU - Aliberti, R.
AU - Kalantar-Nayestanaki, N.
AU - Kavatsyuk, M.
AU - Messchendorp, J.
PY - 2024/7/12
Y1 - 2024/7/12
N2 - 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.
AB - 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.
U2 - 10.1103/PhysRevLett.133.021901
DO - 10.1103/PhysRevLett.133.021901
M3 - Article
SN - 0031-9007
VL - 133
JO - Physical Review Letters
JF - Physical Review Letters
IS - 2
M1 - 021901
ER -