Exclusive production of 
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 at the 
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 factories Belle and 
<i>BABAR</i>
 using the principle of maximum conformalit

Sun, Z.; Wu, Xing-Gang; Ma, Y.; Brodsky, Stanley J.

doi:10.1103/physrevd.98.094001

Cited by 22 publications

(15 citation statements)

References 34 publications

(46 reference statements)

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“…In our calculations, the Mathematica package MALT@FDC [12,13,29,30] is employed to obtain Γ Virtual , Γ S , and Γ HC . FDC [31] package serves as the agent to are free of divergence.…”

Section: ½1mentioning

confidence: 99%

Next-to-leading-order QCD corrections to the decay of Z boson into χc(χb)

Sun

Zhang

2019

Phys. Rev. D

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Based on the framework of nonrelativistic quantum chromodynamics, we carry out next-to-leadingorder (NLO) QCD corrections to the decay of Z boson into χ c and χ b , respectively. The branching ratio of Z → χ c ðχ b Þ þ X is about 10 −5 ð10 −6 Þ. For the color-singlet (CS) 3 P ½1 J state, the heavy quark-antiquark pair associated process serves as the leading role. However the process of Z → QQ½ 3 P ½1 J þ g þ g can also provide non-negligible contributions, especially for the χ b cases. In the case of the color-octet (CO) 3 S ½8 1 state, the single-gluon-fragmentation diagrams that first appear at the NLO level can significantly enhance the leading-order results. Consequently the CO contributions account for a large proportion of the total decay widths. Moreover, including the CO contributions will thoroughly change the CS predictions on the ratios of Γ χ c1 =Γ χ c0 , Γ χ c2 =Γ χ c0 , Γ χ b1 =Γ χ b0 , and Γ χ b2 =Γ χ b0 , which can be regarded as an outstanding probe to distinguish between the CO and CS mechanism. Summing over all the feeddown contributions from χ c and χ b , respectively, we find ΓðZ → J=ψ þ XÞj χ c −feeddown ¼ ð0.28 − 2.4Þ × 10 −5 and ΓðZ → ϒð1SÞ þ XÞj χ b −feeddown ¼ ð0.15 − 0.49Þ × 10 −6 .

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“…In our calculations, the Mathematica package MALT@FDC [12,13,29,30] is employed to obtain Γ Virtual , Γ S , and Γ HC . FDC [31] package serves as the agent to are free of divergence.…”

Section: ½1mentioning

confidence: 99%

Next-to-leading-order QCD corrections to the decay of Z boson into χc(χb)

Sun

Zhang

2019

Phys. Rev. D

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“…Based on our investigation using the PMC, the effective momentum flow for the b quark forward-backward should be μ r M Z . Such a point has been noted also in other similar dynamic processes [35,36]: the charmonium production in electron-positron collisions at the B factories where the effective momentum flow is shown to be around μ r ∼ 2 GeV, far lower than the center-of-mass energy √ s = 10.6 GeV. There are some additional examples to show that the conventional choice of the scale is more of a guess work.…”

Section: The B Quark Forward-backward Asymmetry With Thrust Axis Defimentioning

confidence: 63%

Revisiting the bottom quark forward–backward asymmetry $$A_\mathrm{{FB}}$$ in electron–positron collisions

Wang

Meng

et al. 2020

Eur. Phys. J. C

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The bottom quark forward–backward asymmetry $$A_\mathrm{{FB}}$$AFB is a key observable in electron–positron collisions at the $$Z^{0}$$Z0 peak. In this paper, we employ the Principle of Maximum Conformality (PMC) to fix the $$\alpha _s$$αs-running behavior of the next-to-next-to-leading order QCD corrections to $$A_\mathrm{{FB}}$$AFB. The resulting PMC scale for this $$A_\mathrm{{FB}}$$AFB is an order of magnitude smaller than the conventional choice $$\mu _r=M_Z$$μr=MZ. This scale has the physically reasonable behavior and reflects the virtuality of its QCD dynamics, which is independent to the choice of renormalization scale. Our analyses show that the effective momentum flow for the bottom quark forward–backward asymmetry should be $$\mu _r\ll M_Z$$μr≪MZ other than the conventionally suggested $$\mu _r=M_Z$$μr=MZ. Moreover, the convergence of perturbative QCD series for $$A_\mathrm{{FB}}$$AFB is greatly improved using the PMC. Our prediction for the bare bottom quark forward–backward asymmetry is refined to be $$A^{0,b}_\mathrm{FB}=0.1004\pm 0.0016$$AFB0,b=0.1004±0.0016, which diminishes the well known tension between the experimental determination for this (pseudo) observable and the respective Standard Model fit to $$2.1\sigma $$2.1σ.

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“…The good consistency between data and MC simulation for this charged track multiplicity indicates that the current MC simulation works generally well. With this charged track multiplicity, many studies with η c in the final state [26] are possible with higher precision than previously. TABLE VII.…”

Section: Discussionmentioning

confidence: 97%

Measurements of the branching fractions of ηc→K+K−π0 , KS<

Ablikim¹,

Ачасов²,

Ahmed³

et al. 2019

Phys. Rev. D

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Using data samples collected with the BESIII detector at center-of-mass energies ffiffi ffi s p ¼ 4.23, 4.26, 4.36, and 4.42 GeV, we measure the branching fractions of η c → K þ K − π 0 , K 0 S K AE π ∓ , 2ðπ þ π − π 0 Þ, and pp, via the process e þ e − → π þ π − h c , h c → γη c. The corresponding results are ð1.15 AE 0.12 AE 0.10Þ%, ð2.60 AE 0.21 AE 0.20Þ%, ð15.2 AE 1.8 AE 1.7Þ%, and ð0.120 AE 0.026 AE 0.015Þ%, respectively. Here the first uncertainties are statistical, and the second ones systematic. Additionally, the charged track multiplicity of η c decays is measured for the first time.

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Exclusive production of J/ψ+ηc at the B factories Belle and BABAR using the principle of maximum conformalit

Cited by 22 publications

References 34 publications

Next-to-leading-order QCD corrections to the decay of Z boson into χc(χb)

Next-to-leading-order QCD corrections to the decay of Z boson into χc(χb)

Revisiting the bottom quark forward–backward asymmetry $$A_\mathrm{{FB}}$$ in electron–positron collisions

Measurements of the branching fractions of ηc→K+K−π0 , KS<

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