Near threshold 
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 and 
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 photoproduction at JLab and RHIC

Hatta, Yoshitaka; Rajan, Abha; Yang, Di-Lun

doi:10.1103/physrevd.100.014032

Cited by 60 publications

(53 citation statements)

References 24 publications

(69 reference statements)

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“…Indeed, it is the graviton Regge trajectory at low √ s that transmutes to the Pomeron Regge trajectory at large √ s in holography, thereby providing a unified description of the photoproduction process of heavy mesons at all energies. These results complement those presented originally in [4,5] away from threshold, and are overall consistent with some of the general observations presented recently in [17,18] close to threshold.…”

Section: Discussionsupporting

confidence: 93%

“…One purpose of these experiments is the extraction of the gluonic component entering the composition of the nucleon mass. In this spirit, a new analysis of these threshold data was carried in [17,18] using a hybrid holographic construction combining general QCD arguments and lattice results. One of the purposes of this paper is to carry an analysis of the new GlueX data near threshold [15] and the existing world data well above threshold, all within a holographic QCD model using the bottom-up approach.…”

Section: Introductionmentioning

confidence: 99%

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Diffractive photoproduction of J/ψ and ϒ using holographic QCD: Gravitational form factors and GPD of gluons in the proton

Mamo

Zahed

2020

Phys. Rev. D

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We present a holographic analysis of diffractive photoproducton of charmonium J/ψ and upsilonium Υ on a proton, considered as a bulk Dirac fermion, for all ranges of √ s, i.e., from near threshold to very high energy. Using the bulk wave functions of the proton and vector mesons, within holographic QCD, and employing Witten diagrams in the bulk, we compute the diffractive photoproduction amplitude of J/ψ and Υ. The holographic amplitude shows elements of the strictures of vector meson dominance (VMD). It is dominated by the exchange of a massive graviton or 2 ++ glueball resonances near threshold, and its higher spin-j counterparts that reggeize at higher energies. Both the differential and total cross sections are controlled by the gravitational form factor A(t), and compare well to the recent results reported by the GlueX collaboration near threshold and the world data at large √ s. The holographic gravitational form factors, including the D-term, which is due to the exchange of massive spin-0 glueballs, are in good agreement with lattice simulations. We use it to extract the holographic pressure and shear forces inside the proton. Finally, using a pertinent integral representation of the holographic gravitational form factor A(t) near threshold, and its Pomeron counterpart way above threshold, we extract the generalized parton distribution (GPD) of gluons inside the proton at different resolutions.

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Section: Discussionsupporting

confidence: 93%

Section: Introductionmentioning

confidence: 99%

Diffractive photoproduction of J/ψ and ϒ using holographic QCD: Gravitational form factors and GPD of gluons in the proton

Mamo

Zahed

2020

Phys. Rev. D

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“…Meanwhile, there has been a strong proposal to build an intermediate energy electron-ion collider in China (EicC) [32], where the energy range is ideal to study both near and sub-threshold Υ production in γp and γA collisions, respectively. There is also a possibility to study the nearthreshold production of Υ at the EIC in the U.S. [33] and at RHIC using ultraperipheral collisions [34]. Our calculations in this paper will provide an important guidelines for these future experiments.…”

Section: Introductionmentioning

confidence: 92%

“…4. This energy range is ideally suited for the EicC, but it could also be studied at the EIC in the U.S. [33], or even at RHIC by focusing on the ultraperipheral AA collisions (UPCs) [34]. We find that the Υ cross section near threshold is about 10 −3 ∼ 10 −2 nb, and this is further reduced to 10 −5 nb around the region W γp 9.7 GeV where the SRC contribution starts to dominate.…”

Section: B Src Contribution From the Spectral Functionmentioning

confidence: 99%

Sub-threshold J/ψ and ϒ production in γA collisions

Hatta

Strikman

et al. 2020

Physics Letters B

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We study sub-threshold heavy quarkonium (J/ψ and Υ) photo-productions in γA collisions as an independent test of the universality of the nucleon-nucleon short range correlation (SRC) in nuclear scattering processes. Just below the γp threshold, the cross section is dominated by the mean field contribution of nucleons inside the nucleus. The SRC contributions start to dominate at lower photon energies, depending on the fraction of the SRC pairs in the target nucleus. We give an estimate of the cross sections in the sub-threshold region both for J/ψ and Υ. This may be helpful for future measurements at JLab as well as at the Electron-Ion Collider in the U.S., and especially in China.

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“…Different mass decompositions (sum rules) related to the EMT have been proposed in the literature [21][22][23][24][25]. It has also been argued that photo-and electro-production of quarkonia close to the kinematical threshold can add to the understanding of the nucleon mass [26][27][28][29][30][31][32].…”

Section: Jhep09(2020)067mentioning

confidence: 99%

Mass sum rules of the electron in quantum electrodynamics

Rodini

Metz

Pasquini

2020

J. High Energ. Phys.

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Different decompositions of the nucleon mass, in terms of the masses and energies of the underlying constituents, have been proposed in the literature. We explore the corresponding sum rules in quantum electrodynamics for an electron at one-loop order in perturbation theory. To this aim we compute the form factors of the energy-momentum tensor, by paying particular attention to the renormalization of ultraviolet divergences, operator mixing and scheme dependence. We clarify the expressions of all the proposed sum rules in the electron rest frame in terms of renormalized operators. Furthermore, we consider the same sum rules in a moving frame, where they become energy decompositions. Finally, we discuss some implications of our study on the mass sum rules for the nucleon.

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Near threshold J/ψ and ϒ photoproduction at JLab and RHIC

Cited by 60 publications

References 24 publications

Diffractive photoproduction of J/ψ and ϒ using holographic QCD: Gravitational form factors and GPD of gluons in the proton

Diffractive photoproduction of J/ψ and ϒ using holographic QCD: Gravitational form factors and GPD of gluons in the proton

Sub-threshold J/ψ and ϒ production in γA collisions

Mass sum rules of the electron in quantum electrodynamics

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