Intrinsic light and strange quark-antiquark pairs in the proton and nonperturbative strangeness suppression

An, Chun-Sheng; Saghai, B.

doi:10.1103/physrevd.95.074015

Cited by 8 publications

(9 citation statements)

References 43 publications

(132 reference statements)

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“…In our previous studies on the strangeness magnetic form factor of the proton [37] and the nonperturbative strangeness suppression [38],…”

Section: Numerical Results and Discussionmentioning

confidence: 99%

“…(19), for the Goldstone boson exchange model, was determined by fitting [32,33] the experimental data for the sea flavor asymmetry I a =d −ū = 0.118 ± 0.012 of the proton [1]. This ensemble allowed us postdicting, on the one hand, the strangeness magnetic moment µ s and the strangeness magnetic moment G s M of the proton [37], and on other hand, shedding a light [38] on the measured [39] quark-antiquark ratios r ℓ = uū/dd, r s = ss/dd, and the strangeness content of the proton κ s = 2ss/(uū + dd).…”

Section: Discussionmentioning

confidence: 99%

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Orbital angular momentum of the proton and intrinsic five-quark Fock states

Saghai

2019

Phys. Rev. D

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The orbital angular momentum (L q ) of the proton is studied by employing the extended constituent quark model. Contributions from different flavors, namely, up, down, strange, and charm quarks in the proton are investigated. Probabilities of the intrinsic qq pairs are calculated using a 3 P 0 transition operator to fit the sea flavor asymmetry I a =d −ū = 0.118 ± 0.012 of the proton [1].Our numerical results lead to L q = 0.158 ± 0.014, in agreement with 4/3I a = 0.157 ± 0.016, and consistent with findings based on various other approaches.

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“…In our previous studies on the strangeness magnetic form factor of the proton [37] and the nonperturbative strangeness suppression [38],…”

Section: Numerical Results and Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Orbital angular momentum of the proton and intrinsic five-quark Fock states

Saghai

2019

Phys. Rev. D

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“…It should be noted that, this quantity has been already calculated in Refs. [42][43][44] and [46] so that many different results have been reported for its value. In Ref.…”

Section: Intrinsic Strange Distributionmentioning

confidence: 99%

“…In spite of the global analysis of PDFs for studying the impact of nucleon intrinsic charm component, there are no similar global analysis for the intrinsic light quarks. Although, despite some studies on the distributions of the intrinsic light quarks in the nucleon and their related probabilities [42][43][44][45][46], a simultaneous study of the intrinsic and extrinsic light quarks has not been performed yet in any global analysis of a wide range of the experimental data. Among the sea quark distributions of the nucleon, the strange one has an important role in better understanding the nucleon structure.…”

Section: Introductionmentioning

confidence: 99%

Improved determination of strange distribution function from the global analysis using BHPS model

Salajegheh,

Nejad,

Tehrani

2021

Preprint

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We study the impact of intrinsic strange (IS) component of nucleon sea on the global analysis of parton distribution functions (PDFs) considering a wide range of experimental data. To this aim, we consider two scenarios on the basis of BHPS model results for the IS distribution. In the first scenario, we apply the results presented through the BHPS model and in the second scenario we use its evolved distributions. For each scenarios, we present the limit of the IS probability P ss 5 for the standard tolerance criteria ∆χ 2 = 1 and 18.112 at 1σ and 4σ levels. Our results show that the experimental data can tolerate an IS component with a greater probability P ss 5 if one employs the second scenario. We obtain P ss 5 ≈ 0.01 and P ss 5 ≈ 0.025 for ∆χ 2 = 1 and 18.112, respectively, at the 4σ level. We also calculate the ratio of strange-to-light sea-quark densities rs in the proton both including and excluding the IS component. Our results show that one can obtain a higher value for the ratio rs if the IS component is included.

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“…The first ones are produced perturbatively through the splitting of the gluons into qq pairs and are dominant at small x regions, while the later ones are produced through the nonperturbative fluctuations of the nucleon state to five-quark states or meson plus baryon states and are dominant at large x regions. In recent years, the intrinsic quarks have been a subject of study by many investigators [31,34,35,36,37,38,39,40,41,42,43,44,45].…”

Section: Introductionmentioning

confidence: 99%

Study of the s−s¯ asymmetry in the proton

Goharipour

2018

Nuclear Physics A

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The study of s −s asymmetry is essential to better understand of the structure of nucleon and also the perturbative and nonperturbative mechanisms for sea quark generation. Actually, the nature and dynamical origins of this asymmetry have always been an interesting subject to research both experimentally and theoretically. One of the most powerful models can lead to s−s asymmetry is the meson-baryon model (MBM). In this work, using a simplified configuration of this model suggested by Pumplin, we calculate the s −s asymmetry for different values of cutoff parameter Λ, to study the dependence of model to this parameter and also to estimate the theoretical uncertainty imposed on the results due to its uncertainty. Then, we study the evolution of distributions obtained both at next-to-leading order (NLO) and next-to-next-to-leading order (NNLO) using different evolution schemes. It is shown that the evolution of the intrinsic quark distributions from a low initial scale, as suggested by Chang and Pang, is not a good choice at NNLO using variable flavor number scheme (VFNS).

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Intrinsic light and strange quark-antiquark pairs in the proton and nonperturbative strangeness suppression

Cited by 8 publications

References 43 publications

Orbital angular momentum of the proton and intrinsic five-quark Fock states

Orbital angular momentum of the proton and intrinsic five-quark Fock states

Improved determination of strange distribution function from the global analysis using BHPS model

Study of the s−s¯ asymmetry in the proton

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