| THE PHYSICS OF ELEMENTARY PARTICLES AND FIELDS |
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Regarding the Distribution of Glue in the Pion |
| Lei Chang1* and Craig D. Roberts2,3* |
1School of Physics, Nankai University, Tianjin 300071, China
2School of Physics, Nanjing University, Nanjing 210093, China
3Institute for Nonperturbative Physics, Nanjing University, Nanjing 210093, China
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| Cite this article: |
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Lei Chang and Craig D. Roberts 2021 Chin. Phys. Lett. 38 081101 |
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Abstract Understanding why the scale of emergent hadron mass is obvious in the proton but hidden in the pion may rest on mapping the distribution functions (DFs) of all partons within the pion and comparing them with those in the proton; and since glue provides binding in quantum chromodynamics, the glue DF could play a special role. Producing reliable predictions for the proton's DFs is difficult because the proton is a three-valence-body bound-state problem. As sketched herein, the situation for the pion, a two-valence-body problem, is much better, with continuum and lattice predictions for the valence-quark and glue DFs in agreement. This beginning of theory alignment is timely because experimental facilities now either in operation or planning promise to realize the longstanding goal of providing pion targets, thereby enabling precision experimental tests of rigorous theory predictions concerning Nature's most fundamental Nambu–Goldstone bosons.
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Received: 20 May 2021
Editors' Suggestion
Published: 02 August 2021
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| PACS: |
14.70.Dj
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(Gluons)
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14.40.Aq
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13.60.Hb
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(Total and inclusive cross sections (including deep-inelastic processes))
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12.38.Aw
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(General properties of QCD (dynamics, confinement, etc.))
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Abstract
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