Photonic parton distributions

Glück, M.; Reya, E.; Vogt, A.

doi:10.1103/physrevd.46.1973

Cited by 529 publications

(735 citation statements)

References 26 publications

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“…Another source of differences is in the choice and scope of experimental data from which F γ 2 is extracted. At present there is an appreciable number of photon parton distribution sets available, both at leading and next-to-leading orders [55][56][57][58][59][60][61][62][63][64][65][66][67][68][69][70]. It should be noted that unlike in the case of a nucleon, there are no valence quarks present in the photon; therefore antiquark distributions are the same as quark distributions.…”

Section: Parton Distributions In Nuclei and Photonsmentioning

confidence: 99%

“…The rationale for this will become clear when we present results for the resolved component in heavy quark production. Two sets are relatively older and have been in common use: the Gluck-Reya-Vogt (GRV) set [61] and that by Schuler and Sjostrand (SaS1d) [65]. The third set, the CornetJankowski-Krawczyck (CJK2) set [69], is more recent and has facility to estimate error on a calculated quantity due to the uncertainties in the input photon parton distributions.…”

Section: Parton Distributions In Nuclei and Photonsmentioning

confidence: 99%

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Constraining gluon shadowing using photoproduction in ultraperipheralpAandAAcollisions

Adeluyi

Bertulani

2012

Phys. Rev. C

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Photoproduction of heavy quarks and exclusive production of vector mesons in ultraperipheral proton-nucleus and nucleus-nucleus collisions depend significantly on nuclear gluon distributions. In the present study we investigate quantitatively the extent of the applicability of these processes at the Large Hadron Collider (LHC) in constraining the shadowing component of nuclear gluon modifications.

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Section: Parton Distributions In Nuclei and Photonsmentioning

confidence: 99%

Section: Parton Distributions In Nuclei and Photonsmentioning

confidence: 99%

Constraining gluon shadowing using photoproduction in ultraperipheralpAandAAcollisions

Adeluyi

Bertulani

2012

Phys. Rev. C

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“…In the unpolarized case, a phenomenologically very successful prediction for the unpolarized photon structure functions f γ has emerged within the radiative parton model, where [29] a VMD valence-like structure at a low resolution scale µ was imposed as the input boundary condition, assuming that at this scale the photon entirely behaves like a vector meson, i.e., that its parton content is proportional to that of the ρ-meson. Since nothing is known experimentally about the latter, the parton densities of the neutral pion as determined in a previous study [30] were used instead which are expected not to be too dissimilar from those of the ρ.…”

Section: Polarized Parton Distributions Of the Proton And The Photonmentioning

confidence: 99%

Photoproduction of jets and heavy flavors at future polarized ep -colliders

Stratmann

Vogelsang

1997

Zeitschrift f�r Physik C Particles and Fields

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“…as in [6]. If not stated otherwhise the hard scale in the calculation of the cross-section µ is taken to be the transverse mass of the produced heavy quark…”

mentioning

confidence: 99%

“…We test the sensitivity of considered processes to the gluonic content of the photon by using two different parton density parametrizations for the real photon: GRV [6] and SaS1d [7]. Both these parametrizations were extracted from QCD fits to photon structure function data measured in eγ collisions from e + e − interactions, but have different assumptions for the gluon content, which is only weakly constrained by these measurements.…”

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confidence: 99%

Charm production at a linear e+e− and photon collider and its sensitivity to the gluon content of the photon

Jankowski¹,

Krawczyk²,

Roeck³

2001

Nuclear Instruments and Methods in Physics Research Section A:

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A high energy linear e + e − collider (LC) can also be used as a Photon Collider (PC), using Compton scattering of laser photons on the e + /e − beams. The leading order cross-section for the production of heavy quarks, e + e − → e + e − Q(Q)X, at high transverse momenta is calculated for both LC and PC modes. The sensitivity of this process to the parton distribution parametrizations of real photons, especially the gluon content, is tested for both modes.For the study of a future electron-positron Linear Collider (LC) it is important to examine the physics potential for its main and possible derived options. The so called Photon (or Compton) Collider (PC) is an option in which high energy real photons can be obtained by backscattering photons from a laser beam on the electron or positron beam [1,2]. This way an excellent tool for the study of γγ collisions at high energies can be constructed.In high energy e + e − collisions the hadronic final state is predominantly produced in γ ⋆ γ ⋆ interactions where the virtual photons are almost on mass shell. These processes can be described by an effective (real) photon energy spectrum, i.e. using the Weizsäcker-Williams (WW) approximation. A Photon Collider based on Compton scattering, however, provides beams of real photons, which can be produced in a definite polarization state and with high monochromaticity. Moreover, the resulting photon spectrum (denoted as LASER) is much harder then the WW one. The comparison of the photon spectra used in this analysis (see Appendix) is presented in Fig. 1.The main goal of this work is to compare the LC and PC opportunities for probing the gluon distribution in the photon, without making use of polarization. Heavy quark 1

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Photonic parton distributions

Cited by 529 publications

References 26 publications

Constraining gluon shadowing using photoproduction in ultraperipheralpAandAAcollisions

Constraining gluon shadowing using photoproduction in ultraperipheralpAandAAcollisions

Photoproduction of jets and heavy flavors at future polarized ep -colliders

Charm production at a linear e+e− and photon collider and its sensitivity to the gluon content of the photon

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