Quark-antiquark asymmetry of helicity distributions in the nucleon sea

Liu, Mengyun; Ma, Bo-Qiang

doi:10.1103/physrevd.98.036024

Cited by 6 publications

(3 citation statements)

References 92 publications

(135 reference statements)

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“…A particular realization of the diquark model picture in high energy physics is the light-cone quark-spectatordiquark model [13,14] in which the relativistic effect of quark transverse motions is taken into account [15,16]. This model plays an important role in investigating hadron structures by calculating relevant physical quantities, such as helicity distribution functions [13,17,18], transversity distribution functions [14], form factors [19][20][21][22],…”

Section: Introductionmentioning

confidence: 99%

Leading and higher twist transverse momentum dependent parton distribution functions in the spectator model

Liu,

Mao,

Wang

et al. 2021

Preprint

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Transverse momentum dependent parton distribution functions, also abbreviated as TMDs, offer a threedimensional picture of hadrons by taking the intrinsic transverse momentum of the parton into consideration.Hence, they are very important for us to understand the structure of hadrons. In this article, we calculate and summarize all TMDs of quark through the spectator model, from twist-2 to twist-4. Especially, we give complete results of TMDs at twist-4. We adopt a general analytical framework to calculate TMDs, with both scalar and axial-vector spectators being considered. All TMDs are calculated analytically in the light-cone coordinate, and single gluon rescattering is considered to generate T-odd TMDs. T-even TMDs are also calculated to this level maybe for the first time. Different from the traditional point of view, the twist-4 TMDs can contribute to some physical observables like azimuthal asymmetries. An approximate formula of the Sivers asymmetry including twist-4 TMDs is given.

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Section: Introductionmentioning

confidence: 99%

Leading and higher twist transverse momentum dependent parton distribution functions in the spectator model

Liu,

Mao,

Wang

et al. 2021

Preprint

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“…There have been significant progress on spin distributions of light flavor valence quarks both experimentally and theoretically. Recently, some efforts have been made on the polarization of the light flavor sea quarks [3,4] and the quark-antiquark asymmetry of helicity distributions in nucleon sea [5]. Studies of the momentum distribution asymmetry between strange and antistrange [6][7][8][9][10] are of significance for the study of nonperturbative quantum chromodynamics (QCD) with fruitful progress [11][12][13][14][15][16][17][18][19][20][21][22][23][24][25][26][27][28][29].…”

Section: Introductionmentioning

confidence: 99%

Nucleon strangeness polarization from $$\varLambda /\bar{\varLambda }$$ hyperon production in polarized proton–proton collision at RHIC

Liu

2019

Eur. Phys. J. C

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We calculate the inclusive production of a polarized Λ orΛ hyperon from the single longitudinally polarized proton and proton (pp) collision at RHIC. By comparing the data reported by the STAR Collaboration, we find that this process is sensitive to the polarization of strange and antistrange quarks of the proton in the experimental range. By introducing asymmetric coefficients with the minimization of χ 2 , we further identify the asymmetry of the polarized strange-antistrange quarks in the proton sea and find that the first moment is Δs ≈ − 0.025 ± 0.019 for strange quark and Δs ≈ − 0.001±0.012 for antistrange quark, with central values agreeing with the light-cone meson-baryon fluctuation model prediction, the recent lattice QCD determination of strangeness polarization and results from a global QCD analysis given by the Jefferson Lab Angular Momentum (JAM) Collaboration.

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Section: Introductionmentioning

confidence: 99%

Nucleon strangeness polarization from $Λ/\barΛ$ hyperon production in polarized proton-proton collision at RHIC

Liu,

2019

Preprint

Self Cite

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We calculate the inclusive production of a polarized Λ or Λ hyperon from the single longitudinally polarized proton and proton (pp) collision at RHIC. By comparing the data reported by the STAR Collaboration, we find that this process is sensitive to the polarization of strange and antistrange quarks of the proton in the experimental range. By introducing asymmetric coefficients with the minimization of χ 2 , we further identify the asymmetry of the polarized strange-antistrange quarks in the proton sea and find that the first moment is ∆ s ≈ −0.025 ± 0.019 for strange quark and ∆ s ≈ −0.001 ± 0.012 for antistrange quark, with central values agreeing with the light-cone meson-baryon fluctuation model prediction, the recent lattice QCD determination of strangeness polarization and results from a global QCD analysis given by the Jefferson Lab Angular Momentum (JAM) Collaboration.

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Quark-antiquark asymmetry of helicity distributions in the nucleon sea

Cited by 6 publications

References 92 publications

Leading and higher twist transverse momentum dependent parton distribution functions in the spectator model

Leading and higher twist transverse momentum dependent parton distribution functions in the spectator model

Nucleon strangeness polarization from $$\varLambda /\bar{\varLambda }$$ hyperon production in polarized proton–proton collision at RHIC

Nucleon strangeness polarization from $Λ/\barΛ$ hyperon production in polarized proton-proton collision at RHIC

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