Inclusive production of charged hadrons and 
                
${\rm K}^0_{\rm S}$
               mesons in photon–photon collisions

The present knowledge of the structure of the photon is presented with emphasis on measurements of the photon structure obtained from deep inelastic electron-photon scattering at e + e − colliders. This review covers the leptonic and hadronic structure of quasi-real and also of highly virtual photons, based on measurements of structure functions and differential cross-sections. Future prospects of the investigation of the photon structure in view of the ongoing LEP2 programme and of a possible linear collider are addressed. The most relevant results in the context of measurements of the photon structure from photon-photon scattering at LEP and from photonproton and electron-proton scattering at HERA are summarised.

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“…[176,192,193], on hadron production in Ref. [194], on jet cross-sections in Refs. [195,196], on heavy quark production in Refs.…”

Section: Photon-photon Scattering Atmentioning

confidence: 99%

The photon structure from deep inelastic electron–photon scattering

2000

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“…The scaling violations were tested [8,13] by making comparisons with data of e + e − annihilation at CM energies below [20] and above [24] those pertaining to the data that entered the fits. The universality property was checked [13] by performing a global study of high-energy data on hadroproduction in pp collisions [14,15] and on photoproduction in e ± p [16] and e + e − [25] collisions. Our NLO FFs [8] agree with other up-to-date sets [37] within the present experimental errors [13].…”

Section: Discussionmentioning

confidence: 99%

“…Furthermore, we quantitatively checked the universality of our FFs by making comparisons with essentially all available high-statistics data on inclusive charged-hadron production in colliding-beam experiments [13]. This includes pp data from the UA1 and UA2 Collaborations [14] at SppS and from the CDF Collaboration [15] at the Tevatron, γp data from [8] the H1 and ZEUS Collaborations [16] at HERA, and γγ data from the OPAL Collaboration [25] at LEP2. In hadroproduction and photoproduction, we set µ R = µ F = ξp T .…”

Section: Global Analysis Of Collider Datamentioning

confidence: 99%

Hadron Production in Hadron-Hadron and Lepton-Hadron Collisions

Kniehl

2003

Hadron Collider Physics 2002

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Summary. We review a recent global analysis of inclusive single-charged-hadron production in high-energy colliding-beam experiments, which is performed at nextto-leading order (NLO) in the parton model of quantum chromodynamics endowed with nonperturbative fragmentation functions (FFs). Comparisons of pp data from CERN SppS and the Fermilab Tevatron and γp data from DESY HERA with the corresponding NLO predictions allow for quantitative tests of the scaling violations in the FFs and their universality. We emphasize the potential of new measurements at the Tevatron to place tight constraints in the large-x region and on the gluon FF, complementary to those from e + e − data, which are indispensible in order to reliably predict the π 0 background for the H → γγ signal of the intermediate-mass Higgs boson at the Tevatron and the CERN LHC. Adopting a similar theoretical framework for b-hadron production, we show that the notorious excess of the Tevatron data over existing theoretical calculations can be ascribed, at sufficiently large values of pT , to nonperturbative fragmentation effects inadequately included previously.

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“…Numerous experiments have been proposed [6,15,18] to extract this distribution. Although the polarized quark distributions are somewhat well known, the shape and size of ∆G(x, Q 2 ) has not been determined.…”

Section: The Polarized Gluon Distributionmentioning

confidence: 99%

“…[6] From this and known values of ∆q q from DIS, a value for A G (x G ) can be extracted. Here, x G =ŝ/2M ν is the nucleon momentum fraction carried by the gluon.…”

Section: Experimental Programmentioning

confidence: 99%

Polarized Parton Distributions and the Polarized Gluon Asymmetry

Ramsey

2003

Int. J. Mod. Phys. A

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The flavor-dependent valence, sea quark and antiquark spin distributions can be determined separately from theoretical assumptions and experimental data. We have determined the valence distributions using the Bjorken sum rule and have extracted polarized sea distributions, assuming that the quarks and anti-quarks for each flavor are symmetric. Other experiments have been proposed which will allow us to completely break the SU(3) symmetry of the sea flavors. To create a physical model for the polarized gluons, we investigate the gluon spin asymmetry in a proton,G(x,Q 2 ) . By assuming that htis is is approximately Q 2 invariant, we can completely determine the x-dependence of this asymmetry, which satisfies constituent counting rules and reproduces the basic results of the Bremsstrahlung model originated by Close and Sivers. This asymmetry can be combined with the measured unpolarized gluon density, G(x, Q 2 ) to provide a prediction for ∆G(x, Q 2 ). Existing and proposed experiments can test both the prediction of scale-invariance for A G (x, Q 2 ) and the nature of ∆G itself. These models will be discussed along with suggestions for specific experiments which can be performed at energies typical of HERA, RHIC and LHC to determine these polarized distributions.

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Inclusive production of charged hadrons and ${\rm K}^0_{\rm S}$ mesons in photon–photon collisions

Cited by 16 publications

References 30 publications

The photon structure from deep inelastic electron–photon scattering

The photon structure from deep inelastic electron–photon scattering

Hadron Production in Hadron-Hadron and Lepton-Hadron Collisions

Polarized Parton Distributions and the Polarized Gluon Asymmetry

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