Constraining gluon density of pions at large 
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 by pion-induced 
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 production

Chang, W. C.; Peng, J. C.; Platchkov, S.; Sawada, T.

doi:10.1103/physrevd.102.054024

Cited by 25 publications

(26 citation statements)

References 88 publications

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“…5 conflict with those estimated previously [143,144]. These discrepancies stress that the pion's gluon content is poorly known; but new prompt photon and J/ψ production measurements could address this problem [24,145].…”

Section: Pion Distribution Functionsmentioning

confidence: 97%

Selected Science Opportunities for the EicC

et al. 2020

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An electron ion collider has been proposed in China (EicC). It is anticipated that the facility would provide polarised electrons, protons and ion beams, in collisions with large centre-of-mass energy. This discussion highlights its potential to address issues that are central to understanding the emergence of mass within the Standard Model, using examples that range from the exploration of light-meson structure, through measurements of near-threshold heavy-quarkonia production, and on to studies of the spectrum of exotic hadrons. Contents

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Section: Pion Distribution Functionsmentioning

confidence: 97%

Selected Science Opportunities for the EicC

et al. 2020

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“…Thus, new measurements which are directly sensitive to the pion's gluon content are necessary. Prompt photon and J/ψ production could address this need [428,429]. The sea DFs in Fig.…”

Section: Fig 233mentioning

confidence: 99%

“…Hence, it is fair to describe the sea-quark distribution as empirically unknown. This problem could be addressed with DY data obtained from π ± beams on isoscalar targets [428,430]. Equivalent tagged DIS measurements at the EicC could also provide this information.…”

Section: Fig 233mentioning

confidence: 99%

Electron-ion collider in China

et al. 2021

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Lepton scattering is an established ideal tool for studying inner structure of small particles such as nucleons as well as nuclei. As a future high energy nuclear physics project, an Electron-ion collider in China (EicC) has been proposed. It will be constructed based on an upgraded heavy-ion accelerator, High Intensity heavy-ion Accelerator Facility (HIAF) which is currently under construction, together with a new electron ring. The proposed collider will provide highly polarized electrons (with a polarization of ∼80%) and protons (with a polarization of ∼70%) with variable center of mass energies from 15 to 20 GeV and the luminosity of (2–3) × 1033 cm−2 · s−1. Polarized deuterons and Helium-3, as well as unpolarized ion beams from Carbon to Uranium, will be also available at the EicC.The main foci of the EicC will be precision measurements of the structure of the nucleon in the sea quark region, including 3D tomography of nucleon; the partonic structure of nuclei and the parton interaction with the nuclear environment; the exotic states, especially those with heavy flavor quark contents. In addition, issues fundamental to understanding the origin of mass could be addressed by measurements of heavy quarkonia near-threshold production at the EicC. In order to achieve the above-mentioned physics goals, a hermetical detector system will be constructed with cutting-edge technologies.This document is the result of collective contributions and valuable inputs from experts across the globe. The EicC physics program complements the ongoing scientific programs at the Jefferson Laboratory and the future EIC project in the United States. The success of this project will also advance both nuclear and particle physics as well as accelerator and detector technology in China.

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“…Since gluons are electrically inert, direct empirical access to glue distributions in hadrons is difficult if one uses electron/positron beams. A promising alternative is the study of J/ψ-meson production using π or K beams incident on a proton target [94][95][96] because this process is expected to proceed via gluon+gluon fusion. The resolving scale relevant to such measurements is ζ 3 = m J/ψ = 3.1 GeV; hence in order to assist with future analyses of existing and anticipated data, it is worth calculating the valence, sea and glue distributions in the π and K at ζ 3 .…”

Section: Glue Distributions From J/ψ Productionmentioning

confidence: 99%

On mass and matter

Roberts

2021

AAPPS Bull.

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The visible Universe is largely characterised by a single mass scale, namely, the proton mass, mp. Contemporary theory suggests that mp emerges as a consequence of gluon self-interactions, which are a defining characteristic of quantum chromodynamics (QCD), the theory of strong interactions in the Standard Model. However, the proton is not elementary. Its mass appears as a corollary of other, more basic emergent phenomena latent in the QCD Lagrangian, e.g. generation of nuclear-size gluon and quark mass-scales, and a unique effective charge that may describe QCD interactions at all accessible momentum scales. These remarks are explained herein, and focusing on the distribution amplitudes and functions of π and K mesons, promising paths for their empirical verification are elucidated. Connected therewith, in anticipation that production of J/ψ-mesons using π and K beams can provide access to the gluon distributions in these pseudo-Nambu-Goldstone modes, predictions for all π and K distribution functions are provided at the scale ζ=mJ/ψ.

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Constraining gluon density of pions at large x by pion-induced J/ψ production

Cited by 25 publications

References 88 publications

Selected Science Opportunities for the EicC

Selected Science Opportunities for the EicC

Electron-ion collider in China

On mass and matter

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