Hadronic photon-photon interactions at high energies

Engel, R.; Ranft, J.

doi:10.1103/physrevd.54.4244

Cited by 323 publications

(240 citation statements)

References 75 publications

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“…Twophoton processes are the most important background for the case of small mass differences, since in such cases signal events have small visible energy and small transverse momentum relative to the beam direction. Using the Monte Carlo generators PHOJET [21], PYTHIA [15] and HERWIG [22], hadronic events from various two-photon processes were simulated in which the invariant mass of the photon-photon system (M γ γ ) was larger than 5.0 GeV. Monte Carlo samples for leptonic two-photon processes (e + e − e + e − , e + e − µ + µ − and e + e − τ + τ − ) were generated with the Vermaseren program [23].…”

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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“…[7]) and Phojet (Ref. [8]), and the generated events are then passed through the official ATLAS simulation based on Geant4. All generators distinguish among ND, SD and DD processes but they provide different predictions of the various cross section fractions and dependence on the ξ-acceptance.…”

Section: Total Inelastic Cross Sectionmentioning

confidence: 99%

Results and Perspectives in Forward Physics with ATLAS

Giacobbe

2016

Nuclear and Particle Physics Proceedings

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A review of the ATLAS forward physics results is given with particular emphasis on the aspects of relevance for the cosmic rays community. These include proton-proton cross section measurements at √ s = 7 TeV, diffractive physics studies using rapidity gaps, measurements of energy flow as a function of pseudorapidity, and the first cross section measurement performed in the recently started Run 2 at √ s = 13 TeV. The ATLAS future perspectives will also be discussed, focused on the phase 1 upgrade project AFP, underlying its potential for a wide forward physics program both at low and high luminosity.

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“…PHOJET 1.12.1.3 [24], which relies on PYTHIA 6.115 for the fragmentation of partons, is used with its default settings. A HERWIG++ 2.4.2 [25] sample is used with its default settings, along with an additional sample tuned on 7 TeV underlying event data with HERWIG++ 2.5.1 (UE7) [26].…”

Section: Monte Carlo Samplesmentioning

confidence: 99%

“…The distribution of charged particle multiplicities per jet N ch jet is measured for each of these ranges, separated further into five jet transverse momentum ranges: 4-6 GeV, [6][7][8][9][10][10][11][12][13][14][15][15][16][17][18][19][20][21][22][23][24][24][25][26][27][28][29][30][31][32][33][34][35][36][37][38][39][40] GeV. The longitudinal momentum fraction z of charged particles in these jets is measured in the same rapidity and transverse momentum ranges.…”

Section: Introductionmentioning

confidence: 99%