Summary of Photon 2001

Böhrer, A.; Krawczyk, Maria

doi:10.1142/9789812777157_0072

Cited by 3 publications

(4 citation statements)

References 30 publications

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“…7 in comparison to the NLO QCD prediction of Drees et al [1] and to results from other experiments [20,21,22,23]. Within the uncertainties, this NLO QCD prediction is in good agreement with our measurement and others [24].…”

Section: Total Cross Sectionsupporting

confidence: 91%

Measurement of the inclusive D $^{*\pm}$ production in $\gamma\gamma$ collisions at LEP

Delaere

Lemaı̂tre

2003

Eur. Phys. J. C

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The inclusive production of D * ± mesons in two-photon collisions is measured with the ALEPH detector at e + e − centre-of-mass energies from 183 GeV to 209 GeV. A total of 360 ± 27 D * ± meson events were observed from an integrated luminosity of 699 pb −1 . Contributions from direct and single-resolved processes are separated using the ratio of the transverse momentum p D * ± t of the D * ± to the visible invariant mass W vis of the event. Differential cross sections of D * ± production as functions of p D * ± t and the pseudorapidity |η D * ± | are measured in the range 2 GeV/c < p D * ± t < 12 GeV/c and |η D * ± | < 1.5. They are compared to next-to-leading order (NLO) perturbative QCD calculations. The extrapolation of the integrated visible D * ± cross section to the total charm cross section, based on the Pythia Monte Carlo program, yields σ(e + e − → e + e − cc) < √ s>=197 GeV = 731 ± 74 stat ± 47 syst ± 157 extr pb.

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Section: Total Cross Sectionsupporting

confidence: 91%

Measurement of the inclusive D $^{*\pm}$ production in $\gamma\gamma$ collisions at LEP

Delaere

Lemaı̂tre

2003

Eur. Phys. J. C

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“…We notice that in analogy to the charmonium case (see [4] and references therein) the singlet results obtained from the Υ decay are in disagreement with each other, in this case by only 1σ. The last point from a two-loop enhanced calculation given by [9,1] is in agreement with the potential model result and the singlet decay from the Υ → LH process.…”

Section: Comparison Between Modelssupporting

confidence: 84%

“…First evidence of η b was given in 2001 by ALEPH [1]. The search for η b is done in the decay channel into two photons.…”

Section: Introductionmentioning

confidence: 99%

Theoretical determination of ηb′s electromagnetic decay width

Fabiano¹

2004

Nuclear Physics B - Proceedings Supplements

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“…The LEP II is particularly suitable for this search because of high energy, high luminosity, high γγ cross section and low background from other processes. ALEPH [1,2] has recently started to search for η b into two photons. One candidate event is found in the six-charged particle final state and none in the four-charged particle final state, giving the upper limits: Γ(η b → γγ) × BR(η b → 4 charged particles) < 48 eV , Γ(η b → γγ) × BR(η b → 6 charged particles) < 132 eV .…”

Section: Introductionmentioning

confidence: 99%