Evidence for the High-Energy Photoproduction of Charmed Mesons

Atiya, M. S.; Holmes, Stephen D.; Knapp, B. C.; Lee, W.; Wisniewski, W. J.; Avery, P.; Butler, J. M.; Gladding, G. E.; O’Halloran, T.; Russell, J. J.; Wattenberg, A.; Wiss, J.; Binkley, M.; Cumalat, J. P.; Gaines, I.; Gormley, M.; Loveless, R. L.; Peoples, J.

doi:10.1103/physrevlett.43.414

Cited by 49 publications

(22 citation statements)

References 7 publications

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“…The dotted line represents calculations based on Eq.(1). The result of this calculation exceeds considerably the fixed target experimental data [7,8,9,10,11,12]. One should remember, however, that the simple formula (1) applies at high energies only.…”

Section: Heavy Quark Production In Photon-nucleon Scatteringmentioning

confidence: 53%

Heavy quark production in photon-nucleon and photon-photon collisions

Szczurek

2002

Eur. Phys. J. C

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We discuss several mechanisms of heavy quark production in (real) photon-nucleon and (real) photon -(real) photon collisions. In particular we focuse on application of the Saturation Model. We discuss how to generalize the formula from virtual photon -proton scattering and analyze threshold effects. We discuss a possibility to measure the cross section for γγ → 2c2c. In addition to the main dipoledipole contribution included in a recent analysis, we propose how to calculate within the same formalism the hadronic single-resolved contribution to heavy quark production. At high energies this yields a sizeable correction of about 30-40 % for inclusive charm production and 15-20 % for bottom production. We consider a subasymptotic component to the dipole-dipole approach. We get a good description of recently measured σ(γγ → ccX). Adding all possible contributions to e + e − → bbX together removes a huge deficit observed in earlier works but does not solve the problem totally. Whenever possible, we compare the present approach to the standard collinear one. We propose how to distinguish different mechanisms by measuring heavy quark-antiquark correlations.

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Section: Heavy Quark Production In Photon-nucleon Scatteringmentioning

confidence: 53%

Heavy quark production in photon-nucleon and photon-photon collisions

Szczurek

2002

Eur. Phys. J. C

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“…The available data [33,34,35,36] on heavy-quark (charm and bottom) photoproduction range from energies W of fixed target experiments about tens of GeV, up to the high energy HERA data around W ∼ 200 GeV. Kinematically, the low energy data corresponds to x ≃ 10 −1 and the high energy ones to x ≃ 10 −4 .…”

Section: Resultsmentioning

confidence: 99%

Heavy quark photoproduction in thek⊥-factorization approach

Mariotto

Machado

2002

Phys. Rev. D

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Abstract. We investigate the heavy quark photoproduction based on the k ⊥ -factorization approach, focusing on the results from the saturation model. The deviations in the results using the unintegrated gluon distribution considering the saturation model and the derivative of the collinear gluon distribution are analysed. Total cross sections and p T distributions are analysed in detail, setting the deviations between the color dipole approximation and the complete semihard approach.

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“…(2.1) with the dipole-proton cross section given by σ CGC dip . The experimental data from HERA [25] and fixed target collisions [26] are also included for sake of comparison. The theoretical curves roughly describe the data, which have large uncertainties and large errors.…”

Section: Jhep00(2007)000mentioning

confidence: 99%

Saturation physics in ultra high energy cosmic rays: heavy quark production

Gonçalves

Machado

2007

J. High Energy Phys.

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In this work we estimate the heavy quark production in the interaction of ultra high energy cosmic rays in the atmosphere, considering that the primary cosmic ray is a proton or a photon. At these energies the saturation momentum Q 2 sat (x) stays above the hard scale µ 2 c = 4m 2 c , implying charm production probing the saturation regime. In particular, we show that the ep HERA data presents a scaling on τ c ≡ (Q 2 + µ 2 c )/Q 2 sat (x). We derive our results considering the dipole picture and the Color Glass Condensate formalism, which one shows to be able to describe the heavy quark production in γp and pp collisions. Nuclear effects are considered for the scattering of primaries with the air nuclei and we provide a parametrization for the charm and bottom differential cross sections, dσ/dx F , which can be used as an input for numerical implementations for lepton flux. Implications on the flux of prompt leptons at the Earth are analyzed and a large suppression is predicted.

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Evidence for the High-Energy Photoproduction of Charmed Mesons

Cited by 49 publications

References 7 publications

Heavy quark production in photon-nucleon and photon-photon collisions

Heavy quark production in photon-nucleon and photon-photon collisions

Heavy quark photoproduction in thek⊥-factorization approach

Saturation physics in ultra high energy cosmic rays: heavy quark production

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