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 - Afedulidis, O.

AU - Ai, X. c.

AU - Aliberti, R.

AU - Amoroso, A.

AU - An, Q.

AU - Anderle, D.

AU - Bai, Y.

AU - Bakina, O.

AU - Balossino, I.

AU - Ban, Y.

AU - Bao, H.-R.

AU - Batozskaya, V.

AU - Begzsuren, K.

AU - Berger, N.

AU - Berlowski, M.

AU - Bertani, M.

AU - Bettoni, D.

AU - Bianchi, F.

AU - Bianco, E.

AU - Bortone, A.

AU - Briere, R. a.

AU - Brueggemann, A.

AU - Cai, H.

AU - Николаев, Иван Борисович

AU - Мучной, Николай Юрьевич

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.

UR - https://www.scopus.com/record/display.uri?eid=2-s2.0-85198337979&origin=inward&txGid=fa5a4127586d9a2443894307c126fa63

UR - https://pubmed.ncbi.nlm.nih.gov/39073971/

U2 - 10.1103/PhysRevLett.133.021901

DO - 10.1103/PhysRevLett.133.021901

M3 - Article

C2 - 39073971

VL - 133

SP - 021901

JO - Physical Review Letters

JF - Physical Review Letters

SN - 0031-9007

IS - 2

M1 - 021901

ER -