Cross section measurement of e+e−→ηψ(2S) and search for e+e−→ηX˜(3872)

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Zhu,H Gao,R Q Ma,H M Hu,A Pathak,Y Liu,T Wang,A Q Zhang,A Kupsc,S X Du,G F Cao,X Li,L Fava,N Berger,H.-R Bao,P Zhang,J Y Zhang,S H Zhu,C Y Guan,Q J Xu,Z P Mao,C F Redmer,K S Zhu,Y P Liao,F De Mori,X H Mo

doi:10.1103/physrevd.109.112004

Cross section measurement of e+e−→ηψ(2S) and search for e+e−→ηX˜(3872)

M Ablikim, L Gong + Show 857 more

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https://doi.org/10.1103/physrevd.109.112004

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Journal: Physical review. D, Particles and fields	Publication Date: Jun 5, 2024
License type: CC BY 4.0

#Mass Distribution #Data Samples + Show 7 more

Abstract
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Abstract

The energy-dependent cross section for e+e−→ηψ(2S) is measured at 18 center of mass energies from 4.288 to 4.951 GeV using the BESIII detector. Using the same data samples, we also perform the first search for the reaction e+e−→ηX˜(3872), but no evidence is found for the X˜(3872) in the π+π−J/ψ mass distribution. At each of the 18 center of mass energies, upper limits at the 90% confidence level on the cross section for e+e−→ηψ(2S) and on the product of the e+e−→ηX˜(3872) cross section with the branching fraction of X˜(3872)→π+π−J/ψ are reported. Published by the American Physical Society 2024

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