Unifying “soft” and “hard” diffractive exclusive vector meson production and deeply virtual Compton scattering

Fazio, S.; Fiore, R.; Jenkovszky, L. L.; Salii, A.

doi:10.1103/physrevd.90.016007

Cited by 19 publications

(29 citation statements)

References 77 publications

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“…As shown in Ref. [6], to obtain the ψ(2S) cross section one needs also an appropriate normalization factor, which is expected to be close to f ψ(2S) = m ψ(2S) Γ(ψ(2S)→e + e − ) m J/ψ Γ(J/ψ→e + e − ) = 0.5 . According to a fit of σ γ p→p+ψ(2S) (W ) σ γ p→p+J/ψ (W ) to the data [10] with a two-component Pomeron model, the value f ψ(2S) = 0.4 is reasonable.…”

Section: The γ P → V P Cross Sectionmentioning

confidence: 98%

“…integrated over t) exclusive VMP cross section (the same as at HERA [5,6]), r(y) is the rapidity gap survival correction, and…”

Section: Ultra-peripheral Collisionsmentioning

confidence: 99%

“…In doing so, we use the so-called Reggeometric model [5], the two-component ("soft" and "hard") Pomeron model [6] and a model [9] including the low-energy region. In the Reggeometric model we use…”

Section: The γ P → V P Cross Sectionmentioning

confidence: 99%

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Vector meson production in ultra-peripheral collisions at the LHC

Fiore

Jenkovszky

Libov

et al. 2015

AIP Conference Proceedings

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Section: The γ P → V P Cross Sectionmentioning

confidence: 98%

“…integrated over t) exclusive VMP cross section (the same as at HERA [5,6]), r(y) is the rapidity gap survival correction, and…”

Section: Ultra-peripheral Collisionsmentioning

confidence: 99%

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Vector meson production in ultra-peripheral collisions at the LHC

Fiore

Jenkovszky

Libov

et al. 2015

AIP Conference Proceedings

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“…A prediction from Fazio et al [13] (FFJS) uses a two component Pomeron model to predict the cross sections for vector meson production. A normalisation factor of f −1 ψ(2S) = 0.45 ensures that the ψ(2S) cross section is the same as for other vector mesons at a given value of W , t and Q 2 + M 2 V (i.e.…”

Section: Pos(dis2015)078mentioning

confidence: 99%

Measurement of the cross-section ratio $\sigma \psi (2S)/\sigma J/\psi$ in deep inelastic exclusive ep scattering at HERA

Kovalchuk¹

2016

Proceedings of XXIII International Workshop on Deep-Inelastic Scattering — PoS(DIS2015)

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The exclusive deep inelastic electroproduction of ψ(2S) and J/ψ(1S) has been studied with the ZEUS detector at HERA in the kinematic range 2 ≤ Q 2 ≤ 80 GeV 2 , 30 ≤ W ≤ 210 GeV, and |t| ≤ 1 GeV 2 , where Q 2 is the photon virtuality, W is the photon-proton centre-of-mass energy and t is the squared four-momentum transfer at the proton vertex. The data for 2 ≤ Q 2 ≤ 5 GeV 2 were taken in the HERA I running period and correspond to an integrated luminosity of 114 pb −1 . The data for 5 ≤ Q 2 ≤ 80 GeV 2 are from both HERA I and HERA II periods and correspond to an integrated luminosity of 468 pb −1 . The decay modes analysed were µ + µ − and J/ψ(1S)π + π − for the ψ(2S) and µ + µ − for the J/ψ(1S), and the cross-section ratio σ ψ(2S) /σ J/ψ(1S) has been measured as a function of Q 2 , W and t. The results are compared to predictions of QCD-inspired models of vector-meson production.

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“…The wave functions of the J/ψ(1S ) and ψ(2S ) have been calculated according to the procedure developed previously [23,24] and the low-x inclusive HERA data have been used to constrain the cc-dipole cross section. Fazio et al [25] (FFJS) use a two-component Pomeron model to predict the cross sections for vector-meson production. A normalisation factor of f −1 ψ(2S ) = 0.45 ensures that the value of the ψ(2S ) cross section is the same as for the other vector mesons at the same values of W, t and…”

mentioning

confidence: 99%

Measurement of the cross section ratioσ_ψ(2S)/σ_J/ψ(1S)in deep inelastic exclusiveepscattering at HERA

Ciborowsk

2016

EPJ Web Conf.

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Abstract. The exclusive deep inelastic electroproduction of ψ(2S ) and J/ψ(1S ) at an ep centre-of-mass energy of 317 GeV has been studied with the ZEUS detector at HERA in the kinematic range 2 < Q 2 < 80 GeV 2 , 30 < W < 210 GeV and |t| < 1 GeV 2 , where Q 2 is the photon virtuality, W is the photon-proton centre-of-mass energy and t is the squared four-momentum transfer at the proton vertex. The data for 2 < Q 2 < 5 GeV 2 were taken in the HERA I running period and correspond to an integrated luminosity of 114 pb −1 . The data for 5 < Q 2 < 80 GeV 2 are from both HERA I and HERA II periods and correspond to an integrated luminosity of 468 pb −1 . The decay modes analysed were μ + μ − and J/ψ(1S ) π + π − for the ψ(2S ) and μ + μ − for the J/ψ(1S ). The cross-section ratio σ ψ(2S ) /σ J/ψ(1S ) has been measured as a function of Q 2 , W and t. The results are compared to predictions of QCD-inspired models of exclusive vector-meson production.Exclusive electroproduction of vector mesons in deep inelastic scattering at high energies, ep → eV p, where V denotes a vector meson, may be described as a multi-step process. The electron emits a virtual photon, γ * , with virtuality Q 2 and γ * p centre-of-mass energy W, the virtual photon fluctuates into a qq pair and which subsequently interacts with the proton via a colour-neutral exchange, e.g. through a two-gluon ladder, and then hadronises into the vector meson. The ψ(2S ) and the J/ψ(1S ) have the same quark content, different radial distributions of the wave functions, and their mass difference is small compared to the HERA centre-of-mass energy. Therefore, the ratio of their electroproduction cross sections allows checking perturbative QCD predictions regarding their wave functions [1].The luminosity used for this analysis was 468 pb −1 in total, which consists of data from 1996-2000 and 2002-2007 running periods (HERA I and HERA II, respectively). The kinematic range was 2 < Q 2 < 80 GeV 2 , 30 < W < 210 GeV and |t| < 1 GeV 2 . Events were selected with no activity in the central ZEUS detector in addition to signals from the scattered electron and the decay products of the studied mesons. The sample contained exclusive and a small fraction of proton-dissociative events with diffractive masses M Y < 4 GeV which was assumed to cancel in the cross section ratio. The decay channels were: J/ψ(1S ), ψ(2S ) → μ + μ − , and ψ(2S ) → J/ψ(1S )π + π − with the subsequent decay J/ψ(1S ) → μ + μ − . The analysis was based on data collected with the ZEUS detector when 920(820) GeV protons collided with 27.5 GeV electrons or positrons. The DIFFVM [2] Monte Carlo (MC) was used for simulating the studied process. Exclusive and diffractive Bethe-Heitler dimuon production were simulated using the GRAPE package [3]. The results for the three cross-section

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Unifying “soft” and “hard” diffractive exclusive vector meson production and deeply virtual Compton scattering

Cited by 19 publications

References 77 publications

Vector meson production in ultra-peripheral collisions at the LHC

Vector meson production in ultra-peripheral collisions at the LHC

Measurement of the cross-section ratio $\sigma \psi (2S)/\sigma J/\psi$ in deep inelastic exclusive ep scattering at HERA

Measurement of the cross section ratioσ_ψ(2S)/σ_J/ψ(1S)in deep inelastic exclusiveepscattering at HERA

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Unifying “soft” and “hard” diffractive exclusive vector meson production and deeply virtual Compton scattering

Cited by 19 publications

References 77 publications

Vector meson production in ultra-peripheral collisions at the LHC

Vector meson production in ultra-peripheral collisions at the LHC

Measurement of the cross-section ratio $\sigma \psi (2S)/\sigma J/\psi$ in deep inelastic exclusive ep scattering at HERA

Measurement of the cross section ratioσψ(2S)/σJ/ψ(1S)in deep inelastic exclusiveepscattering at HERA

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Measurement of the cross section ratioσ_ψ(2S)/σ_J/ψ(1S)in deep inelastic exclusiveepscattering at HERA