NUNUGPV — A Monte Carlo event generator for events at LEP

Montagna, G.; Nicrosini, O.; Piccinini, F.

doi:10.1016/0010-4655(96)00081-1

Cited by 15 publications

(19 citation statements)

References 11 publications

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“…For Bhabha events, the BHWIDE [26] and TEEGG [27] generators were used. Muon-and tau-pairs were simulated using the KK2F [28] program and νν(γ) events with the NUNUGPV [29] generator. Multi-hadronic events were simulated using PYTHIA and KK2F.…”

Section: Data and Monte Carlo Samplesmentioning

confidence: 99%

Searches for Gauge-Mediated Supersymmetry Breaking topologies in $e^+e^-$ collisions at centre-of-mass energies up to $\sqrt{s}=209 \mathrm{GeV}$

Abbiendi¹,

Ainsley²,

Åkesson³

et al. 2006

Eur. Phys. J. C

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Searches were performed for topologies predicted by gauge-mediated Supersymmetry breaking models (GMSB). All possible lifetimes of the next-to-lightest SUSY particle (NLSP), either the lightest neutralino or slepton, decaying into the lightest SUSY particle, the gravitino, were considered. No evidence for GMSB signatures was found in the OPAL data sample collected at centre-of-mass energies of √ s = 189-209 GeV at LEP. Limits on the product of the production cross-sections and branching fractions are presented for all search topologies. To test the impact of the searches, a complete scan over the parameters of the minimal model of GMSB was performed. NLSP masses below 53.5 GeV/c 2 in the neutralino NLSP scenario, below 87.4 GeV/c 2 in the stau NLSP scenario and below 91.9 GeV/c 2 in the slepton co-NLSP scenario are excluded at 95 % confidence level for all NLSP lifetimes. The scan determines constraints on the universal SUSY mass scale Λ from the direct SUSY particle searches of Λ > 40, 27, 21, 17, 15 TeV/c 2 for messenger indices N = 1, 2, 3, 4, 5 for all NLSP lifetimes.

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Section: Data and Monte Carlo Samplesmentioning

confidence: 99%

Searches for Gauge-Mediated Supersymmetry Breaking topologies in $e^+e^-$ collisions at centre-of-mass energies up to $\sqrt{s}=209 \mathrm{GeV}$

Abbiendi¹,

Ainsley²,

Åkesson³

et al. 2006

Eur. Phys. J. C

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“…It is worth noticing, in passing, that, thanks to the implementation of the lagrangian of eq. (6) in the ALPHA code, an improved version of the Monte Carlo generator NUNUGPV [34,35] is also available for the study of QAGC in ννγγ events.…”

Section: (9)mentioning

confidence: 99%

“…Among them, it is well known that undetected initial-state radiation (ISR) plays a major rôle. It can be taken into account in the leading log approximation by using the QED Structure Function (SF) approach, in terms of collinear [36] or p ⊥ -dependent SF [34,35]. Following recent work done in ref.…”

Section: Initial-state Radiationmentioning

confidence: 99%

Radiative four-fermion processes at LEP2

et al. 2001

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Abstract. The production of four fermions plus a visible photon in electron-positron collisions is analyzed, with particular emphasis on the LEP2 energy range. The study is based on the calculation of exact matrix elements, including the effect of fermion masses. In the light of the present measurements performed at LEP, triple and quartic anomalous gauge couplings are taken into account. Due to the presence of a visible photon in the final state, particular attention is paid to the treatment of higher-order QED corrections. Explicit results for integrated cross sections and differential distributions are shown and commented. The features of the Monte Carlo program WRAP, used to perform the calculation and available for experimental analysis, are described. PACS.12.15.Ji -13.40.

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“…Two-photon processes are generated using the program of Vermaseren [10] and grc4f for e + e − ℓ + ℓ − , and using Phojet [11] The production of lepton pairs is generated using Bhwide [13] and Teegg [14] for e + e − (γ), and using Koralz [15] for µ + µ − (γ) and τ + τ − (γ). The production of quark pairs, qq(g), is generated using Pythia [16] and the final state ννγγ is generated using Nunugpv98 [17] and Koralz.…”

Section: Opal Detector and Monte Carlo Simulationmentioning

confidence: 99%

Search for anomalous production of acoplanar di-lepton events in

Abbiendi

2000

Eur. Phys. J. C

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A selection of di-lepton events with significant missing transverse momentum has been performed using a total data sample of 237.4 pb −1 at e + e − centre-of-mass energies of 183 GeV and 189 GeV. The observed numbers of events -78 at 183 GeV and 301 at 189 GeV -are consistent with the numbers expected from Standard Model processes, which arise predominantly from W + W − production with each W decaying leptonically. This topology is also an experimental signature for the pair production of new particles that decay to a charged lepton accompanied by one or more invisible particles. Discrimination techniques are described that optimise the sensitivity to particular new physics channels. No evidence for new phenomena is apparent and model independent limits are presented on the production cross-section times branching ratio squared for sleptons and for leptonically decaying charginos and charged Higgs. Assuming a 100% branching ratio for the decaỹ ℓ ± R → ℓ ±χ0 1 , whereχ 0 1 is the lightest neutralino, we exclude at 95% CL: right-handed smuons with masses below 82.3 GeV for mμ − − mχ0 1 > 3 GeV and right-handed staus with masses below 81.0 GeV for mτ − − mχ0 1 > 8 GeV. Right-handed selectrons are excluded at 95% CL for masses below 87.1 GeV for mẽ − − mχ0 1 > 5 GeV, within the framework of the Minimal Supersymmetric Standard Model assuming µ < −100 GeV and tan β = 1.5. Charged Higgs bosons, H ± , are excluded at 95% CL for masses below 82.8 GeV, assuming a 100% branching ratio for the decay H ± → τ ± ν τ .

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NUNUGPV — A Monte Carlo event generator for events at LEP

Cited by 15 publications

References 11 publications

Searches for Gauge-Mediated Supersymmetry Breaking topologies in $e^+e^-$ collisions at centre-of-mass energies up to $\sqrt{s}=209 \mathrm{GeV}$

Searches for Gauge-Mediated Supersymmetry Breaking topologies in $e^+e^-$ collisions at centre-of-mass energies up to $\sqrt{s}=209 \mathrm{GeV}$

Radiative four-fermion processes at LEP2

Search for anomalous production of acoplanar di-lepton events in

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