Systematic analysis of the proton mass radius based on photoproduction of vector charmoniums - INSPIRE

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Systematic analysis of the proton mass radius based on photoproduction of vector charmoniums

Xiao-Yun Wang
(
- Lanzhou U. Technol.
)
,
Fancong Zeng
(
- Lanzhou U. Technol.
)
,
Quanjin Wang
(
- Lanzhou U. Technol. and
- Lanzhou U. (main)
)

Apr 14, 2022

7 pages

Published in:

Phys.Rev.D 105 (2022) 9, 096033

Published: May 1, 2022

e-Print:

2204.07294 [hep-ph]

DOI:

10.1103/PhysRevD.105.096033 (publication)

View in:

ADS Abstract Service

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Abstract: (APS)

In this work, the cross section of the reaction

γ p \to V (J / ψ, ψ (2 S)) p

from the production threshold to medium energy is studied and systematically analyzed within two gluon exchange model. The obtained numerical results are in agreement with experimental data and other theoretical predictions. Under the assumption of the scalar form factor of dipole form, the value of proton mass radius is calculated as

0.55 \pm 0.09 fm

and

0.77 \pm 0.12 fm

from the fit to the predicted

J / ψ

and

ψ (2 S)

differential cross section, respectively. Finally, the average value of proton mass radius is estimated to be

\sqrt{⟨ R_{m}^{2} ⟩} = 0.67 \pm 0.11 fm

. Moreover, one finds that extracting mass radius from the near-threshold differential cross section of heavy quarkoniums is always affected by large

| t |_{\min}

. These obtained results may provide important theoretical reference for the understanding of nucleon structure and future relevant experiments.

Note:

7pages, 10figures

quarkonium: heavy
charmonium: photoproduction
p: mass
p: charge radius
exchange: two-gluon
form factor: dipole
form factor: scalar
form factor: gravitation
threshold: production
model: exchange

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