The detector simulation program for the OPAL experiment at LEP

Allison, J.; Banks, J.; Barlow, R. J.; Batley, J. R.; Biebel, O.; Brun, R.; Buijs, A.; Bullock, F. W.; Chang, C. Y.; Conboy, J. E.; Cranfield, R.; Dallavalle, G. M.; Dittmar, M.; Dumont, Jean-Charles; Fukunaga, C.; Gary, J. W.; Gascon, J.; Geddes, N. I.; Gensler, S. W.; Gibson, V.; Gillies, J. D.; Hagemann, J.; Hansroul, M.; Harrison, P. F.; Hart, J. C.; Hattersley, P. M.; Hauschild, M.; Hemingway, R. J.; Heymann, F.F.; Hobson, P. R.; Hochman, D.; Hospes, R.; Jones, R. W. L.; Kawagoe, K.; Kawamoto, T.; Kennedy, B. W.; Köpke, L.; Kowalewski, R.; Kreutzmann, H.; Lafferty, G. D.; Layter, J. G.; Lellouch, D.; Llyod, S. L.; Lorazo, B.; Losty, M. J.; Luvisetto, M.L.; McPherson, A. C.; Mäshimo, T.; Mättig, P.; Mildenberger, J.; Murray, W. J.; O’Neale, S. W.; Oreglia, M. J.; Patrick, G. N.; Pawley, S. J.; Pfister, P.; Possoz, A.; Prebys, E.; Quast, G.; Redmond, M. W.; Rees, D. L.; Riles, K.; Roach, C. M.; Rossi, A. M.; Routenburg, P.; Schaile, A. D.; Tysarczyk-Niemeyer, G.; Dalen, G. J. Van; Kooten, R. Van; Ward, C. P.; Ward, D. R.; Watkins, P. M.; Watson, N. K.; Weisz, S.; Wilson, G. W.; Yaari, R.; Zanarini, Pietro

doi:10.1016/0168-9002(92)90593-s

Cited by 268 publications

(55 citation statements)

References 22 publications

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“…Four-fermion processes in which at least one of the fermions is a neutrino constitute a serious background at large mass differences. The generated signal and background events were processed through the full simulation of the OPAL detector [26], and the same analysis chain was applied as to the data.…”

Section: The Opal Detector and Event Simulationmentioning

confidence: 99%

Search for scalar top and scalar bottom quarks at LEP

Abbiendi¹,

Ainsley²,

Åkesson³

et al. 2002

Physics Letters B

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Searches for a scalar top quark and a scalar bottom quark have been performed using a data sample of 438 pb −1 at centreof-mass energies of √ s = 192-209 GeV collected with the OPAL detector at LEP. No evidence for a signal was found. The 95% confidence level lower limit on the scalar top quark mass is 97.6 GeV if the mixing angle between the supersymmetric partners of the left-and right-handed states of the top quark is zero. When the scalar top quark decouples from the Z 0 boson, the lower limit is 95.7 GeV. These limits were obtained assuming that the scalar top quark decays into a charm quark and the lightest neutralino, and that the mass difference between the scalar top quark and the lightest neutralino is larger than 10 GeV. The complementary decay mode of the scalar top quark decaying into a bottom quark, a charged lepton and a scalar neutrino has also been studied. The lower limit on the scalar top quark mass is 96.0 GeV for this decay mode, if the mass difference between the scalar top quark and the scalar neutrino is greater than 10 GeV and if the mixing angle of the scalar top quark is zero. From a search for the scalar bottom quark, a mass limit of 96.9 GeV was obtained if the mass difference between the scalar bottom quark and the lightest neutralino is larger than 10 GeV.

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Section: The Opal Detector and Event Simulationmentioning

confidence: 99%

Search for scalar top and scalar bottom quarks at LEP

Abbiendi¹,

Ainsley²,

Åkesson³

et al. 2002

Physics Letters B

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“…First we give those used to generate signal events, then those for generation of the various backgrounds. All Monte Carlo samples were passed through the OPAL detector simulation program [9], and processed in the same way as real data.…”

Section: Data and Monte Carlo Samplesmentioning

confidence: 99%

Determination of the LEP beam energy using radiative fermion-pair events

et al. 2004

Self Cite

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We present a determination of the LEP beam energy using "radiative return" fermion-pair events recorded at centre-of-mass energies from 183 to 209 GeV. We find no evidence of a disagreement between the OPAL data and the LEP Energy Working Group's standard calibration. Including the energy-averaged 11 MeV uncertainty in the standard determination, the beam energy we obtain from the OPAL data is higher than that obtained from the LEP calibration by 0 ± 34(stat.) ± 27(syst.) MeV.

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“…All signal and background Monte Carlo samples are generated with full simulation of the 3 In this paper we refer to the sum of quasi-elastic, single-and double-diffractive events as diffractive events OPAL detector [18]. They are analysed using the same reconstruction algorithms as are applied to the data.…”

Section: Monte Carlo Simulationmentioning

confidence: 99%

Total hadronic cross-section of photon-photon interactions at LEP

al.

2000

Eur. Phys. J. C

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The total hadronic cross-section σ γγ (W ) for the interaction of real photons, γγ → hadrons, is measured for γγ centre-of-mass energies 10 ≤ W ≤ 110 GeV. The cross-section is extracted from a measurement of the process e + e − → e + e − γ * γ * → e + e − + hadrons, using a luminosity function for the photon flux together with form factors for extrapolating to real photons (Q 2 = 0 GeV 2 ). The data were taken with the OPAL detector at LEP at e + e − centre-of-mass energies √ s ee = 161, 172 and 183 GeV. The cross-section σ γγ (W ) is compared with Regge factorisation and with the energy dependence observed in γp and pp interactions. The data are also compared to models which predict a faster rise of σ γγ (W ) compared to γp and pp interactions due to additional hard γγ interactions not present in hadronic collisions.

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The detector simulation program for the OPAL experiment at LEP

Cited by 268 publications

References 22 publications

Search for scalar top and scalar bottom quarks at LEP

Search for scalar top and scalar bottom quarks at LEP

Determination of the LEP beam energy using radiative fermion-pair events

Total hadronic cross-section of photon-photon interactions at LEP

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