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Theoretical estimate on tensor-polarization asymmetry in proton-deuteron Drell-Yan process
High Energy Physics - Phenomenology · Submitted 10 Jun 2016
abstract compiled · 2026-09-23 · no language-model review
The authors' main claim We find that the asymmetry is typically a few percent.
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The abstract, sentence by sentence
Tensor-polarized parton distribution functions are new quantities in spin-one hadrons such as the deuteron, and they could probe new quark-gluon dynamics in hadron and nuclear physics. In charged-lepton deep inelastic scattering (DIS), they are studied by the twist-two structure functions $b_1$ and $b_2$. The HERMES collaboration found unexpectedly large $b_1$ values than a naive theoretical expectation based on the standard deuteron model. The situation should be significantly improved in the near future by an approved experiment to measure $b_1$ at JLab (Thomas Jefferson National Accelerator Facility). There is also an interesting indication in the HERMES result that finite antiquark tensor polarization exists. It could play an important role in solving a mechanism on tensor structure in the quark-gluon level. The tensor-polarized antiquark distributions are not easily determined from the charged-lepton DIS; however, they can be measured in a proton-deuteron Drell-Yan process with a tensor-polarized deuteron target. In this article, we estimate the tensor-polarization asymmetry for a possible Fermilab Main-Injector experiment by using optimum tensor-polarized PDFs to explain the HERMES measurement. We find that the asymmetry is typically a few percent. If it is measured, it could probe new hadron physics, and such studies could create an interesting field of high-energy spin physics. In addition, we find that a significant tensor-polarized gluon distribution should exist due to $Q^2$ evolution, even if it were zero at a low $Q^2$ scale. The tensor-polarized gluon distribution has never been observed, so that it is an interesting future project.
background contribution method result interpretation main claim
| # | sentence | role | the authors' own work | states the main conclusion | strength |
|---|---|---|---|---|---|
| s0 | Tensor-polarized parton distribution functions are new quantities in spin-one hadrons such as the deuteron, and they could probe new quark-gluon dynamics in hadron and nuclear physics. | background 1.00 | 0.04 | 0.04 | hedged possibility 0.76 |
| s1 | In charged-lepton deep inelastic scattering (DIS), they are studied by the twist-two structure functions $b_1$ and $b_2$. | background 1.00 | 0.04 | 0.02 | asserted 1.00 |
| s2 | The HERMES collaboration found unexpectedly large $b_1$ values than a naive theoretical expectation based on the standard deuteron model. | background 0.98 | 0.03 | 0.02 | asserted 1.00 |
| s3 | The situation should be significantly improved in the near future by an approved experiment to measure $b_1$ at JLab (Thomas Jefferson National Accelerator Facility). | background 0.59 | 0.04 | 0.03 | asserted 0.52 |
| s4 | There is also an interesting indication in the HERMES result that finite antiquark tensor polarization exists. | background 0.76 | 0.05 | 0.03 | hedged possibility 0.99 |
| s5 | It could play an important role in solving a mechanism on tensor structure in the quark-gluon level. | interpretation 0.78 | 0.07 | 0.04 | hedged possibility 1.00 |
| s6 | The tensor-polarized antiquark distributions are not easily determined from the charged-lepton DIS; however, they can be measured in a proton-deuteron Drell-Yan process with a tensor-polarized deuteron target. | gap 0.56 | 0.06 | 0.05 | asserted 0.80 |
| s7 | In this article, we estimate the tensor-polarization asymmetry for a possible Fermilab Main-Injector experiment by using optimum tensor-polarized PDFs to explain the HERMES measurement. | contribution 0.85 | 0.93 | 0.10 | asserted 0.97 |
| s8 | We find that the asymmetry is typically a few percent. | result 1.00 | 0.96 | 0.49 | asserted 1.00 |
| s9 | If it is measured, it could probe new hadron physics, and such studies could create an interesting field of high-energy spin physics. | interpretation 0.78 | 0.15 | 0.13 | hedged possibility 1.00 |
| s10 | In addition, we find that a significant tensor-polarized gluon distribution should exist due to $Q^2$ evolution, even if it were zero at a low $Q^2$ scale. | result 0.98 | 0.92 | 0.16 | asserted 0.96 |
| s11 | The tensor-polarized gluon distribution has never been observed, so that it is an interesting future project. | future work 0.85 | 0.13 | 0.07 | asserted 0.85 |
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The paper
Original abstract
Tensor-polarized parton distribution functions are new quantities in spin-one hadrons such as the deuteron, and they could probe new quark-gluon dynamics in hadron and nuclear physics. In charged-lepton deep inelastic scattering (DIS), they are studied by the twist-two structure functions $b_1$ and $b_2$. The HERMES collaboration found unexpectedly large $b_1$ values than a naive theoretical expectation based on the standard deuteron model. The situation should be significantly improved in the near future by an approved experiment to measure $b_1$ at JLab (Thomas Jefferson National Accelerator Facility). There is also an interesting indication in the HERMES result that finite antiquark tensor polarization exists. It could play an important role in solving a mechanism on tensor structure in the quark-gluon level. The tensor-polarized antiquark distributions are not easily determined from the charged-lepton DIS; however, they can be measured in a proton-deuteron Drell-Yan process with a tensor-polarized deuteron target. In this article, we estimate the tensor-polarization asymmetry for a possible Fermilab Main-Injector experiment by using optimum tensor-polarized PDFs to explain the HERMES measurement. We find that the asymmetry is typically a few percent. If it is measured, it could probe new hadron physics, and such studies could create an interesting field of high-energy spin physics. In addition, we find that a significant tensor-polarized gluon distribution should exist due to $Q^2$ evolution, even if it were zero at a low $Q^2$ scale. The tensor-polarized gluon distribution has never been observed, so that it is an interesting future project.
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References
How the literature uses it
4 arXiv papers cite this in 6 sentences
Papers whose main result relates to this one's
States the same result 2 papers
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Obtained spin asymmetries are typically a few percent order and they could be measured by the Fermilab-E1039 experiment.
Spin asymmetry for proton-deuteron Drell-Yan process with tensor-polarized deuteron · 1.00
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Then, we predicted that the asymmetry is of the order of a few percent.
Papers citing it · 5 sentences without a confident label
Cites it as background 1 paper
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Additionally, opportunities to access tensor polarization in the deuteron exist at Fermilab in Drell-Yan reactions [ref] and at the Jefferson Lab implementation of a future electron ion collider (JLEIC), also allowing for spectator nucleon tagging capabilities [ref] .
Standard convolution description of deuteron tensor spin structure · Introduction · 0.89
What it cites · 2 sentences without a confident label
Cites as background 2 papers
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There is also a plan to measure the tensor polarization $A_zz$ at JLab in the large-$x$ region [ref] , and $b_1$ could be measured at EIC [ref] .
Gluons and the quark sea at high energies: distributions, polarization, tomography · Tensor-polarization asymmetry in proton-deuteron Drell-Yan process · 0.87
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On related spin-one hadron physics, there are investigations on leptoproduction of spin-one hadron [ref] , fragmentation functions [ref] , generalized parton distributions [ref] , target-mass corrections [ref] , positivity constraints [ref] , lattice QCD estimate [ref] , and angular momenta for spin-1 hadron [ref] .
Tensor polarization dependent fragmentation functions and e+e-\to V \pi X at high energies · Introduction · 1.00
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