Chiral light-front perturbation theory and the flavor dependence of the light-quark nucleon sea

Alberg, Mary; Miller, Gerald A.

doi:10.1103/physrevc.100.035205

Cited by 20 publications

(12 citation statements)

References 65 publications

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“…The correlations of the statistical uncertainties of σD/(2σH) were propagated through the d/ū extraction. The dependence on the value for the 26 and the green band shows the predictions of the statistical parton distributions of Basso, Bourrely, Pasechnik and Soffer 22 . The red solid (blue dashed) curves show the calculated ratios of d(x) to ū(x) with CT18 30 (CTEQ6 36 ) parton distributions at the scales of the SeaQuest results.…”

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confidence: 59%

“…21,22 Another class including chiral soliton models 23 and meson-baryon models emphasize mesonic degrees of freedom in proton structure. [24][25][26] These latter models (statistical, chiral soliton, and meson-baryon) each attempt to describe the entire non-perturbative composition of the proton. A common feature of these models is a rise in the d/ū flavor asymmetry with x.…”

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confidence: 99%

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The Asymmetry of Antimatter in the Proton

Dove,

Kerns,

McClellan

et al. 2021

Preprint

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The structure of the proton is a prototypical example of a strongly coupled and correlated system with the quarks and gluons interacting according to quantum chromodynamics (QCD). At large energy and momentum scales, the interaction is relatively weak, while at lower energy scales the picture is still clouded by the increasingly strong in-teraction. The original quark model, in which the proton consists of two up quarks (u) and one down (d) quark, has an appealing simplicity, but experiments that measure the distributions of quarks as a function of the fractional momentum of the proton that they carry (x) have revealed a rich structure with additional quarks, antimatter quarks (anti-

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confidence: 59%

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confidence: 99%

The Asymmetry of Antimatter in the Proton

Dove,

Kerns,

McClellan

et al. 2021

Preprint

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“…A recent (October 2017) Institute for Nuclear Theory Workshop, "The Flavor Structure of the Nucleon Sea", provides an excellent overview Figure 11. The upper graph shows the NUSEA [12]d/ū data compared to the hadron model calculation of Alberg and Miller [74] and the statistical parton distribution fit of Bourrely and Soffer [32]. The lower plot showsd −ū from NUSEA [12] and HERMES [15] along with an instanton model [75], chiral quark solition model [34], the meson cloud model of Alberg and Miller [74] and the statistical parton distribution fit [32].…”

Section: Calculations and Models Of The Sea Distributionsmentioning

confidence: 99%

“…Many of these issues have been handled by Alberg and Miller [103]. Recent predictions of the Alberg and Miller calculations in the context of chiral light front perturbation theory [74] are shown in Fig. 11.…”

Section: Hadron Modelsmentioning

confidence: 99%

The sea of quarks and antiquarks in the nucleon

Geesaman¹,

Reimer²

2019

Rep. Prog. Phys.

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The quark and gluon structure of the proton has been under intense experimental and theoretical investigation for five decades. Even for the distributions of the well-studied valence quarks, challenges such as the value of the down quark to up quark ratio at high fractional momenta remain. Much of the sea of quark-antiquark pairs emerges from the splitting of gluons and is well described by perturbative evolution in quantum chromodynamics. However, experiments confirm that there is a non-perturbative component to the sea that is not well understood and hitherto has been difficult to calculate with ab initio non-perturbative methods. This non-perturbative structure shows up, perhaps most directly, in the flavor dependence of the sea antiquark distributions. While some of the general trends can be reproduced by models, there are features of the data that do not seem to be well described. This article discusses the experimental situation, the status of calculations and models, and the directions where these studies will progress in the near future.

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“…xxi 2.24d(x)/ū(x) prediction (grey band) for the meson cloud model [61]. Blue points are E866 data points.…”

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confidence: 99%

Light Anti-Quark Flavor Asymmetry in the Nucleon Sea and the Nuclear Dependence of Anit-Quarks in Nuclei at the Seaquest Experiment

Tadepalli

2019

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is an experiment aimed at studying the anti-quark distributions of nucleons and nuclei. The experiment uses a 120 GeV/c proton beam extracted from the Main Injector at Fermilab to collide with various solid and cryogenic targets to study a variety of physics topics. The experiment takes advantage of the Drell-Yan process in order to probe specifically the high-x anti-quark distributions of the target nucleus. The acceptance of the spectrometer is tuned to explore the unprecedentedly high Bjorken-x region, thereby extending our knowledge of the anti-quark sea structure of nucleons and nuclei.A new Intensity-Extrapolation method was developed to counter the rate dependence challenge at SeaQuest. Using this method, the ratio of cross sections of liquid deuterium and liquid hydrogen, σ pd (x)/2σ pp (x), was measured in the range 0.1 ≤ x T ≤ 0.45. The results have been found to be consistently above 1 for all values of the measured range of x T . Also, a first look atd(x)/ū(x) is presented. The trend of the data points indicate that the ratio is consistently above 1 for the measured range of x T . These results (when combined with more data) will provide a key input in constraining many theoretical models that attempt to explain the origin of the nucleon sea.Using the same method, the nuclear dependence of the per-nucleon cross section ratio, R pA , of carbon, iron and tungsten versus deuterium studied as a function of x T , p T , andx F are reported. The results for x T are consistent with E772 indicating little nuclear de-I would like to thank Dr. Chuck Brown for his guidance and help. He was always ready for a stimulating physics discussion and never let go of a teachable moment. Working with him was competitive, fun and a great learning experience.My sincere thanks goes to Dr. Kei Nagai for the analysis help he provided. He made my life much easier by helping write, understand, and organize an efficient analysis code. vii I would like to thank Dr. Po-Ju Lin for all the "fun" times at Lab 6 working on repairing and installing the new St 1 drift chamber. Working with 20 micron sense wire was itself difficult but his company made it bearable and fun. I would like to thank Dr. Joshua Rubin for all the inspiring and intellectually stimulating physics discussions. I truly enjoyed our Daddios' diner venting sessions and napkin discussions. I would like to thank Dr. Michelle

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Chiral light-front perturbation theory and the flavor dependence of the light-quark nucleon sea

Cited by 20 publications

References 65 publications

The Asymmetry of Antimatter in the Proton

The Asymmetry of Antimatter in the Proton

The sea of quarks and antiquarks in the nucleon

Light Anti-Quark Flavor Asymmetry in the Nucleon Sea and the Nuclear Dependence of Anit-Quarks in Nuclei at the Seaquest Experiment

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