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- W3200529875 abstract "A bstract In this paper, we present a detailed next-to-leading-order (NLO) study of J/ψ angular distributions in e + e − → J/ψ + η c , χ cJ ( J = 0 , 1 , 2) within the nonrelativistic QCD factorization (NRQCD). The numerical NLO expressions for total and differential cross sections, i.e., $$ frac{dsigma}{dcos theta } $$ <mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML> <mml:mfrac> <mml:mi>dσ</mml:mi> <mml:mrow> <mml:mi>d</mml:mi> <mml:mo>cos</mml:mo> <mml:mi>θ</mml:mi> </mml:mrow> </mml:mfrac> </mml:math> = A + B cos 2 θ , are both derived. With the inclusion of the newly-calculated QCD corrections to A and B , the α θ (= B/A ) parameters in J/ψ + χ c 0 and J/ψ + χ c 1 are moderately enhanced, while the magnitude of α θJ/ψ + χc 2 is significantly reduced; regarding the production of J/ψ + η c , the α θ value remains unchanged. By comparing with experiment, we find the predicted α θJ/ψ + ηc is in good agreement with the B elle measurement; however, α θJ/ψ + χc 0 is still totally incompatible with the experimental result, and this discrepancy seems to hardly be cured by proper choices of the charm-quark mass, the renormalization scale, and the NRQCD matrix elements." @default.
- W3200529875 created "2021-09-27" @default.
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- W3200529875 date "2021-09-01" @default.
- W3200529875 modified "2023-10-18" @default.
- W3200529875 title "Next-to-leading-order study of J/ψ angular distributions in e+e− → J/ψ + ηc, χcJ at $$ sqrt{s} $$ ≈ 10.6 GeV" @default.
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- W3200529875 doi "https://doi.org/10.1007/jhep09(2021)073" @default.
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