Effect of sea quarks on single-spin asymmetries<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" altimg="si1.gif" overflow="scroll"><mml:msubsup><mml:mrow><mml:mi>A</mml:mi></mml:mrow><mml:mrow><mml:mi>N</mml:mi></mml:mrow><mml:mrow><mml:msup><mml:mrow><mml:mi>W</mml:mi></mml:mrow><mml:mrow><mml:mo>±</mml:mo></mml:mrow></mml:msup></mml:mrow></mml:msubsup></mml:math>in transversely polarized pp collisions at RHIC

Tian, Fang; Gong, Chang; Ma, Bo-Qiang

doi:10.1016/j.nuclphysa.2017.09.006

Cited by 4 publications

(4 citation statements)

References 95 publications

(118 reference statements)

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“…It might be promising to determine sea quark Sivers function by fitting to the experimental data on the SSA in W ± production in pp collisions [54]. Theū andd Sivers function extracted from this observable [55] seems to be compatible with our result in terms of sign.…”

Section: Sea Quark Sivers Distribution In Cgcsupporting

confidence: 83%

Sea quark Sivers distribution

2019

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We compute sea quark Sivers distribution within color glass condensate(CGC) framework. It has been found that up to the leading logarithm accuracy, the collinear twist-3 approach and the CGC calculation yield the same result for sea quark Sivers distribution in the dilute limit. We further verify that transverse momentum dependent factorization is consistent with CGC treatment at small x for the case of transverse spin asymmetry in open charm quark production in semi-inclusive deeply inelastic scattering process in an overlap kinematical region.PACS numbers: I. INTRODUCTIONPolarization dependent phenomenology at small x has attracted a lot of attentions in recent years, as it plays an important role in studying gluon tomography of nucleon/nuclei. Employing powerful color glass condensate(CGC) effective theory [1] and transverse momentum dependent(TMD) factorization [2,3] to polarization effects at small x has produced fruitful results. Among various topical issues in small x spin physics, small x parton helicity distributions [4,5], linearly polarization of small x gluons [6][7][8][9][10][11][12][13][14], (for a recent review covering this topic, see [15]), spin independent odderon [16][17][18] and spin dependent odderon [19][20][21], and elliptical gluon distribution [22][23][24][25][26] were most extensively investigated recently. In this paper, we further explore the phenomenological consequence of spin dependent odderon.In perturbative QCD, odderon is a color-singlet exchange and can be formed by three gluons in a symmetric color state. In the saturation regime, the expectation value of odderon that incorporates multiple gluon exchange effect has been computed in the MV model [1] with a cubic term [27]. The energy dependence of the odderon exchange is described by the BKP equation [28], which also can be formulated in the dipole model [29] and CGC framework [30,31]. It was found in Ref.[19] that a spin dependent odderon can be induced by an asymmetric color source distribution (i.e. valence quark distribution in the context of the MV model) in the transverse plane of a transversely polarized nucleon [32][33][34]. To be more precise, transverse momentum transferred through spin dependent odderon is correlated with transverse spin of target. In a more recent work [20], three T-odd gluon TMDs are shown to be identical and related to the spin dependent odderon. It turns out that the spin dependent odderon is the only possible source contributing to transverse single spin asymmetries(SSAs) at small x in the context of TMD factorization and CGC framework.During the past few decades, transverse single spin asymmetries in high energy scattering is one of the major focus in hadron physics studies. It not only poses the great theoretical challenge to account for the observed large SSAs, but also offers us opportunities to address some central aspects of hadron physics, such as the universality issue associated with QCD factorization theorem, and parton orbital angular momentum inside nucleon. Depending on kinematical r...

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Section: Sea Quark Sivers Distribution In Cgcsupporting

confidence: 83%

Sea quark Sivers distribution

2019

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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

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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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Effect of sea quarks on single-spin asymmetriesANW±in transversely polarized pp collisions at RHIC

Cited by 4 publications

References 95 publications

Sea quark Sivers distribution

Sea quark Sivers distribution

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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