Elastic electroproduction of 
                $\rho$
               mesons at HERA

al., C. Adloff et

doi:10.1007/s100520000150

Cited by 74 publications

(18 citation statements)

References 2 publications

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“…We describe the VM decay in the helicity system, which is given in terms of the three angles illustrated in Fig. 2 [31,41]:…”

Section: B Final State Angular Distributionsmentioning

confidence: 99%

“…So, we assume SCHC holds, and take the single differential distributions (integrated over φ and ϕ or θ respectively) to sample during event generation. For spin-0 VM, such as ρ and φ, the angular distributions are, after integration [31]: Ω(cos θ) ∝ 1 − r 04 00 + (3r 04 00 − 1) cos 2 (θ) (21) Ω(cos ϕ) ∝ 1 − 2r 04 1−1 cos(2ϕ)…”

Section: B Final State Angular Distributionsmentioning

confidence: 99%

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Exclusive vector meson production at an electron-ion collider

Lomnitz

2019

Phys. Rev. C

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Coherent exclusive vector meson electroproduction is a key physics channel at an electron-ion collider. It probes the gluon structure of nuclei over a wide range of Q 2 , and can be used to measure nuclear shadowing and to search for gluon saturation and/or the colored glass condensate. In this paper, we present calculations of the kinematic distributions for a variety of exclusive vector meson final states: the ρ, φ, J/ψ, ψ and the Υ states. The cross-sections for light and cc mesons are large, while Υ states should be produced in moderate numbers at a medium energy EIC (the proposed U.S. designs) and in large numbers at the LHeC. We investigate the acceptances for these states, as a function of detector rapidity coverage. A large-acceptance detector is needed to cover the full range photon-nucleon collision energies produced at an EIC; a forward detector is required to observe vector mesons from the most energetic photon interactions, and thereby probe gluons at the lowest possible Bjorken-x values. arXiv:1803.06420v2 [nucl-ex]

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“…We describe the VM decay in the helicity system, which is given in terms of the three angles illustrated in Fig. 2 [31,41]:…”

Section: B Final State Angular Distributionsmentioning

confidence: 99%

Section: B Final State Angular Distributionsmentioning

confidence: 99%

Exclusive vector meson production at an electron-ion collider

Lomnitz

2019

Phys. Rev. C

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“…Exclusive J=ψ production in electron-proton deep inelastic scattering has been studied in detail at HERA by the H1 and ZEUS experiments [4][5][6][7][8][9]. Additionally, lighter ρ and ϕ [10][11][12] and heavier ϒ states [13,14] have been measured. Recently, it has also become possible to measure exclusive vector meson production at the RHIC and at the LHC in ultraperipheral collisions [15,16] where the impact parameter between the two hadrons is large enough such that the scattering is mediated by quasireal photons; see Refs.…”

Section: Introductionmentioning

confidence: 99%

Relativistic corrections to the vector meson light front wave function

2020

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We compute a light front wave function for heavy vector mesons based on long-distance matrix elements constrained by decay width analyses in the nonrelativistic QCD framework. Our approach provides a systematic expansion of the wave function in quark velocity. The first relativistic correction included in our calculation is found to be significant and crucial for a good description of the HERA exclusive J=ψ production data. When looking at cross section ratios between nuclear and proton targets, the wave function dependence does not cancel out exactly. In particular the fully nonrelativistic limit is found not to be a reliable approximation even in this ratio. The important role of the Melosh rotation to express the rest frame wave function on the light front is illustrated.

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“…These effects are largest near threshold. The cross-section for the γX → V MX process uses parameterizations to existing HERA data [5,6]. For proton targets we assume the the following functional form:…”

Section: Modeling Electroproduction In Estarlightmentioning

confidence: 99%

Coherent vector meson production at an electron ion collider

Lomnitz¹

2018

Proceedings of XXVI International Workshop on Deep-Inelastic Scattering and Related Subjects — PoS(DIS2018)

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Exclusive vector meson electroproduction over a broad Q 2 range offers a unique opportunity to probe the gluon structure of nuclei to measure nuclear shadowing, and to search for gluon saturation and/or the colored glass condensate at an Electron-Ion Collider. Understanding the kinematic distributions and cross sections for specific processes can impact detector design to maximize their acceptance and strengthen the physics case. We will discuss predictions from a Monte Carlo generator eSTARlight, a tool developed to study production of exclusive vector meson final states. We present final state distributions and production rates for the ρ, φ , J/ψ, ψ and the ϒ states in ep and eA collisions at the different energies.

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Elastic electroproduction of $\rho$ mesons at HERA

Cited by 74 publications

References 2 publications

Exclusive vector meson production at an electron-ion collider

Exclusive vector meson production at an electron-ion collider

Relativistic corrections to the vector meson light front wave function

Coherent vector meson production at an electron ion collider

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