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Measurement of the Light Antiquark Flavor Asymmetry in the Nucleon Sea

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Paper breakdownThe authors' claims, conditions and measurements, as JSON Signed receiptProof this review has not been altered
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E.A. Hawker, T.C. Awes, M.E. Beddo, C.N. Brown, J.D. Bush, T.A. Carey, T.H. Chang, W.E. Cooper
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C.A. Gagliardi, G.T. Garvey, D.F. Geesaman, X.C. He, L.D. Isenhower, S.B. Kaufman, D.M. Kaplan, P.N. Kirk, D.D. Koetke, G. Kyle, D.M. Lee, W.M. Lee, M.J. Leitch, N. Makins, P.L. McGaughey, J.M. Moss, B.A. Mueller, P.M. Nord, B.K. Park, V. Papavassiliou, J.C. Peng, G. Petitt, P.E. Reimer, M.E. Sadler, J. Selden, P.W. Stankus, W.E. Sondheim, T.N. Thompson, R.S. Towell, R.E. Tribble, M.A. Vasiliev, Y.C. Wang, Z.F. Wang, J.C. Webb, J.L. Willis, D.K. Wise, G.R. Young

High Energy Physics - Experiment · Submitted 12 Mar 1998

abstract compiled · 2026-09-23 · no language-model review

The authors' main claim A strong x dependence is observed in the ratio dbar/ubar, showing substantial enhancement of dbar with respect to ubar for x<0.2.

how it is stated · asserted 1.00 read the record →

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arXiv IDhep-ex/9803011 (version 1)
Pith IDGDGAD2VG, Pith's permanent record of this paper and its review
CitationB.A. Mueller, B.K. Park, C.A. Gagliardi, C.N. Brown, D.D. Koetke, D.F. Geesaman, D.K. Wise, D.M. Kaplan, D.M. Lee, E.A. Hawker, G. Kyle, G. Petitt, G.R. Young, G.T. Garvey, J.C. Peng, J.C. Webb, J.D. Bush, J.L. Willis, J.M. Moss, J. Selden, L.D. Isenhower, M.A. Vasiliev, M.E. Beddo, M.E. Sadler, M.J. Leitch, N. Makins, P.E. Reimer, P.L. McGaughey, P.M. Nord, P.N. Kirk, P.W. Stankus, R.E. Tribble, R.S. Towell, S.B. Kaufman, T.A. Carey, T.C. Awes, T.H. Chang, T.N. Thompson, V. Papavassiliou, W.E. Cooper, W.E. Sondheim, W.M. Lee, X.C. He, Y.C. Wang, Z.F. Wang. "Measurement of the Light Antiquark Flavor Asymmetry in the Nucleon Sea." arXiv:hep-ex/9803011 (1998). https://pith.science/paper/GDGAD2VG
Claim paper

The compiled record

The paper's own sentences, arranged. Each label is drawn from a closed vocabulary; the number beside it is the probability the classifier gave that label. Numbers in the tables are the authors', checked by code. No sentence in this record was written by a model.

Open the compiled record

Compiled by classifier-1.13-20260917 via OpenRouter, question bank abstract-p1-20260923, 2026-09-23: 1 request, 4,951 input tokens, $0.0002 reported.

What the abstract itself states, as probabilities: claims first 0.03 · states limitation 0.16 · human participants 0.02 · controlled comparison 0.13 · randomized assignment 0.01 · states quantitative result 0.72 · compares with prior results 0.95 · mentions code or data availability 0.02.

The abstract, sentence by sentence

arXiv listing abstract v1. Results and the main claim are underlined; .

A precise measurement of the ratio of Drell-Yan yields from an 800 GeV/c proton beam incident on hydrogen and deuterium targets is reported. Over 140,000 Drell-Yan muon pairs with dimuon mass M_{mu+ mu-} >= 4.5 GeV/c^2 were recorded. From these data, the ratio of anti-down (dbar) to anti-up (ubar) quark distributions in the proton sea is determined over a wide range in Bjorken-x. A strong x dependence is observed in the ratio dbar/ubar, showing substantial enhancement of dbar with respect to ubar for x<0.2. This result is in fair agreement with recent parton distribution parameterizations of the sea. For x>0.2, the observed dbar/ubar ratio is much nearer unity than given by the parameterizations.

background contribution method result interpretation main claim

What the classifier reports for each sentence. The number is the probability it gave the label.
#sentencerolethe authors' own workstates the main conclusionstrength
s0 A precise measurement of the ratio of Drell-Yan yields from an 800 GeV/c proton beam incident on hydrogen and deuterium targets is reported. contribution 0.74 0.95 0.04 asserted 1.00
s1 Over 140,000 Drell-Yan muon pairs with dimuon mass M_{mu+ mu-} >= 4.5 GeV/c^2 were recorded. method 0.99 0.96 0.03 asserted 1.00
s2 From these data, the ratio of anti-down (dbar) to anti-up (ubar) quark distributions in the proton sea is determined over a wide range in Bjorken-x. result 0.62 0.96 0.32 asserted 1.00
s3 A strong x dependence is observed in the ratio dbar/ubar, showing substantial enhancement of dbar with respect to ubar for x<0.2. result 1.00 0.96 0.78 asserted 1.00
s4 This result is in fair agreement with recent parton distribution parameterizations of the sea. interpretation 0.84 0.27 0.07 hedged possibility 0.55
s5 For x>0.2, the observed dbar/ubar ratio is much nearer unity than given by the parameterizations. result 0.97 0.93 0.20 asserted 1.00

What kind of paper the classifier reports this is: empirical study 1.00 · evidence from observation or experiment 1.00.

What was examined, and what was not

sources read
  • arXiv listing abstract v1
not examined
  • full text
  • figures and tables
  • references and citing sentences
  • relations to other papers
levels run
  • P abstract
not run
  • S sections
  • T body sentences
  • C citations
  • R cross-paper relations

Every quoted sentence on this record is the authors'. Every label is from Pith's closed vocabulary, with the probability shown beside it. Every number in the measurements table is the authors', checked by code. Record as JSON

The paper
Original abstract

A precise measurement of the ratio of Drell-Yan yields from an 800 GeV/c proton beam incident on hydrogen and deuterium targets is reported. Over 140,000 Drell-Yan muon pairs with dimuon mass M_{mu+ mu-} >= 4.5 GeV/c^2 were recorded. From these data, the ratio of anti-down (dbar) to anti-up (ubar) quark distributions in the proton sea is determined over a wide range in Bjorken-x. A strong x dependence is observed in the ratio dbar/ubar, showing substantial enhancement of dbar with respect to ubar for x<0.2. This result is in fair agreement with recent parton distribution parameterizations of the sea. For x>0.2, the observed dbar/ubar ratio is much nearer unity than given by the parameterizations.

Human review

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References
How the literature uses it

18 arXiv papers cite this in 19 sentences

Each citing sentence is taken from the citing paper's LaTeX source and typed by Pith's classifier. A label appears at probability 0.8 or more (0.95 for support), a contest at 0.7 or more; the quoted words are the citing authors'. How each label was checked · JSON

Papers whose main result relates to this one's

Found among the papers closest to this one by title and main claim. Pith's classifier compared each pair's main results and a second model family confirmed the relation; checked against two further families, shown conflicts agreed 118 times in 120 and shown same results 218 times in 239. The quoted sentence is the other paper's main claim.

States the same result 1 paper

Papers citing it · 12 sentences without a confident label

Uses its data or values 2 papers
  • The analysis included DIS data from fixed target electron-hadron scattering experiments at Jefferson Lab [ref] , HERMES [ref] , SLAC [ref] , BCDMS [ref] , and NMC [ref] , and from the HERA $ep$ collider [ref] ; $W$ [ref] and $Z$ [ref] asymmetries as well as jet [ref] and $γ$+jet [ref] data from CDF and D0 experiments at Tevatron; lepton pair production (LPP) from the E866 experiment at Fermilab [ref] .

    Light quark and antiquark constraints from new electroweak data · Dataset · 1.00

  • For Drell-Yan lepton-pair production data we use differential cross section measurements $^2σ_/Q$ by the E866/NuSea Collaboration [ref] at Fermilab, which include proton scattering from proton and deuteron targets.

    Simultaneous Monte Carlo analysis of parton densities and fragmentation functions · Data Sets · 1.00

Compares with it 2 papers
Cites it as background 3 papers

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