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Exclusive photoproduction of $\eta_{c}\gamma$ pairs with large invariant mass
High Energy Physics - Phenomenology · Submitted 3 Aug 2024
abstract compiled · 2026-09-23 · no language-model review
The authors' main claim We found that the cross-section is sufficiently large for dedicated experimental study.
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The abstract, sentence by sentence
In this preprint we analyzed the exclusive photoproduction of $\eta_{c}\gamma$ pairs in the collinear factorization framework and evaluated its cross-section in leading order in the strong coupling $\alpha_{s}$. We found that this process is mostly sensitive to the behavior of the unpolarized gluon GPD $H_{g}$ in the Efremov-Radyushkin-Brodsky-Lepage kinematics. We estimated numerically the cross-section and the expected counting rates in the kinematics of middle-energy photoproduction experiments which can be realized at the future Electron-Ion Collider and in the kinematics of ultraperipheral collisions at LHC. We found that the cross-section is sufficiently large for dedicated experimental study.
background contribution method result interpretation main claim
| # | sentence | role | the authors' own work | states the main conclusion | strength |
|---|---|---|---|---|---|
| s0 | In this preprint we analyzed the exclusive photoproduction of $\eta_{c}\gamma$ pairs in the collinear factorization framework and evaluated its cross-section in leading order in the strong coupling $\alpha_{s}$. | contribution 0.95 | 0.95 | 0.08 | asserted 0.99 |
| s1 | We found that this process is mostly sensitive to the behavior of the unpolarized gluon GPD $H_{g}$ in the Efremov-Radyushkin-Brodsky-Lepage kinematics. | result 0.71 | 0.94 | 0.20 | asserted 1.00 |
| s2 | We estimated numerically the cross-section and the expected counting rates in the kinematics of middle-energy photoproduction experiments which can be realized at the future Electron-Ion Collider and in the kinematics of ultraperipheral collisions at LHC. | contribution 0.50 | 0.93 | 0.08 | asserted 0.96 |
| s3 | We found that the cross-section is sufficiently large for dedicated experimental study. | interpretation 0.71 | 0.93 | 0.69 | asserted 0.99 |
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The paper
Original abstract
In this preprint we analyzed the exclusive photoproduction of $\eta_{c}\gamma$ pairs in the collinear factorization framework and evaluated its cross-section in leading order in the strong coupling $\alpha_{s}$. We found that this process is mostly sensitive to the behavior of the unpolarized gluon GPD $H_{g}$ in the Efremov-Radyushkin-Brodsky-Lepage kinematics. We estimated numerically the cross-section and the expected counting rates in the kinematics of middle-energy photoproduction experiments which can be realized at the future Electron-Ion Collider and in the kinematics of ultraperipheral collisions at LHC. We found that the cross-section is sufficiently large for dedicated experimental study.
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How the literature uses it
3 arXiv papers cite this in 9 sentences
Papers citing it · 4 sentences without a confident label
Builds on it 1 paper
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Recently in [ref] we suggested that the gluonic GPDs can be studied in exclusive photoproduction processes which include a quarkonium and a photon in the final state.
Exclusive photoproduction of $\chi_{c}\gamma$ pairs · Introduction · 0.83
Compares with it 2 papers
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In contrast to our previous results for $η_cγ$ production [ref] , the poles are of the second order.
Exclusive photoproduction of $\chi_{c}\gamma$ pairs · The amplitude of the $χ_cγ$ pair production · 0.91
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In the region of moderate energies ($W∼100 GeV,$ $x_B∼10^-2$) we found that the evaluations in dipole approach agree (up to a factor of two) with similar evaluations in the collinear factorization framework from [ref] and are comparable by order of magnitude for other $2→3$ channels discussed in the literature [ref] .
Photoproduction of $\eta_{c}\gamma$ pairs in CGC framework · Conclusions · 1.00
Cites it as background 1 paper
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While in recent decades a lot of progress has been made on understanding GPDs at large and moderate $x$ [ref] , their behavior at small $x$ has been explored to a much lesser degree.
On the Two $R$-Factors in the Small-$x$ Shockwave Formalism · Introduction · 0.98
What it cites · 70 sentences without a confident label
Uses the method or tool of 13 papers
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In what follows for the sake of definiteness, we will use for our estimates the Kroll-Goloskokov parametrization of the GPDs [ref] .
The role of the quark and gluon GPDs in hard vector-meson electroproduction · Differential cross-sections · 0.83
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In what follows for the sake of definiteness, we will use for our estimates the Kroll-Goloskokov parametrization of the GPDs [ref] .
The target asymmetry in hard vector-meson electroproduction and parton angular momenta · Differential cross-sections · 0.83
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In what follows for the sake of definiteness, we will use for our estimates the Kroll-Goloskokov parametrization of the GPDs [ref] .
An attempt to understand exclusive pi+ electroproduction · Differential cross-sections · 0.83
Uses data or values from 2 papers
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In experimental studies the $η_c$-meson is frequently identified via its decays to pions and kaons, e.g.: $η_c(1S)→K_S^0K^+π^-$, for which the corresponding branching fraction is [ref] [equation] This translates into detection (counting) rate $dN_d/dt≈$32 events/month, with $N_d=$127 detected events per $100fb^-1$ of integrated luminosity.
1903.05375 · Integrated cross-sections and counting rates · 1.00
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[equation] [equation] [equation] [equation] where we introduced shorthand notations $α≡α_η_c=(-u')/M_γη_c$, $ζ=x/ξ$, the constant $ℭ_η_c$ in the prefactors of ([ref]-[ref]) is given explicitly by [equation] $⟨𝒪_η_c⟩≡⟨𝒪_η_c[^1S_0^[1]]⟩≈0.3 GeV^3$ is the color singlet long-distance matrix element (LDME) of $η_c$ [ref] , and $r$ is defined as [equation] We also may observe that at large $r$ the photon helicity flip components $C_γη_c^(+-),C̃_γη_c^(+-)$ have a relative suppression by factor $1/r^2$ compared to non-flip components $C_γη_c^(++),C̃_γη_c^(+-)$.
Exclusive Double-Charmonium Production from e^+ e^- Annihilation into a Virtual Photon · The amplitude of the $η_cγ$ pair production · 0.91
Compares with 4 papers
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Our evaluation resembles previous evaluation of the gluonic coefficient function for $γπ^0$ [ref] , however due to use of heavy quark mass limit and NRQCD instead of pion wave function, the final result is materially different and does not allow direct comparison.
Accessing chiral-even quark generalised parton distributions in the exclusive photoproduction of a $ \gamma \pi ^{\pm} $ pair with large invariant mass in both fixed-target and collider experiments · The amplitude of the $η_cγ$ pair production · 0.92
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Our evaluation resembles previous evaluation of the gluonic coefficient function for $γπ^0$ [ref] , however due to use of heavy quark mass limit and NRQCD instead of pion wave function, the final result is materially different and does not allow direct comparison.
Probing axial quark generalized parton distributions through exclusive photoproduction of a $\gamma\,\pi^\pm$ pair with a large invariant mass · The amplitude of the $η_cγ$ pair production · 0.92
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Our evaluation resembles previous evaluation of the gluonic coefficient function for $γπ^0$ [ref] , however due to use of heavy quark mass limit and NRQCD instead of pion wave function, the final result is materially different and does not allow direct comparison.
Breakdown of collinear factorization in the exclusive photoproduction of a $ \pi ^{0}\gamma $ pair with large invariant mass · The amplitude of the $η_cγ$ pair production · 0.92
Cites as background 17 papers
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The relation of the two approaches has been discussed in detail in [ref] .
The leading twist light-cone distribution amplitudes for the S-wave and P-wave quarkonia and their applications in single quarkonium exclusive productions · Evaluation of the coefficient functions · 0.96
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The relation of the two approaches has been discussed in detail in [ref] .
NRQCD Factorization for Twist-2 Light-Cone Wave-Functions of Charmonia · Evaluation of the coefficient functions · 0.96
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The relation of the two approaches has been discussed in detail in [ref] .
Relativistic corrections to light-cone distribution amplitudes of S-wave $B_c$ mesons and heavy quarkonia · Evaluation of the coefficient functions · 0.96
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