The ZEUS calorimeter first level trigger

Smith, W. H.; Ali, I.; Behrens, B. H.; Fordham, C.; Foudas, C.; Goussiou, A. G.; Jaworski, M.; Kinnel, T.; Lackey, J.; Robl, P.; Silverstein, S.; Dawson, J. W.; Krakauer, D.; Talaga, R. L.; Schlereth, J. L.

doi:10.1016/0168-9002(94)01163-x

Cited by 29 publications

(9 citation statements)

References 3 publications

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“…The generated MC events were passed through the standard simulation of the ZEUS detector, based on the GEANT program [62], and a trigger-simulation package [48,49]. The simulated events were reconstructed and selected in the same way as the data.…”

Section: Monte Carlo Simulationsmentioning

confidence: 99%

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Diffractive photoproduction of dijets in ep collisions at HERA

Chekanov¹,

Derrick²,

Magill³

et al. 2008

Eur. Phys. J. C

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Abstract. Diffractive photoproduction of dijets was measured with the ZEUS detector at the ep collider HERA using an integrated luminosity of 77.2 pb −1 . The measurements were made in the kinematic range Q 2 < 1 GeV 2 , 0.20 < y < 0.85 and x IP < 0.025, where Q 2 is the photon virtuality, y is the inelasticity and x IP is the fraction of the proton momentum taken by the diffractive exchange. The two jets with the highest transverse energy, E jet T , were required to satisfy E jet T > 7.5 and 6.5 GeV, respectively, and to lie in the pseudorapidity range −1.5 < η jet < 1.5. Differential cross sections were compared to perturbative QCD calculations using available parameterisations of diffractive parton distributions of the proton.

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Section: Monte Carlo Simulationsmentioning

confidence: 99%

“…A three-level trigger system was used to select events online [29,48,49]. Events with a large energy deposit in the calorimeter, neglecting the three inner rings of cells around the beampipe in the FCAL, were selected at the first-level trigger.…”

Section: Event Selectionmentioning

confidence: 99%

Diffractive photoproduction of dijets in ep collisions at HERA

Chekanov¹,

Derrick²,

Magill³

et al. 2008

Eur. Phys. J. C

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“…The ZEUS pipelined trigger 66 was designed to operate with minimum deadtime. The primary trigger signals were: electromagnetic (EMC) energy above 2.5 -4.8…”

Section: Zeusmentioning

confidence: 99%

Structure Functions of the Nucleon and Their Interpretation

Cooper-Sarkar

Roeck

Devenish

1998

Int. J. Mod. Phys. A

150

171

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The current status of measurements of the nucleon structure functions and their understanding is reviewed. The xed target experiments E665, CCFR and NMC and the HERA experiments H1 and ZEUS are discussed in some detail. The extraction of parton momentum distribution functions from global ts is described, with particular attention paid to much improved information on the gluon momentum distribution. The status of s measurements from deep inelastic data is reviewed. Models and non-perturbative approaches for the parton input distributions are outlined. The impact on the phenomenology of QCD of the data at very low v alues of the Bjorken x variable is discussed in detail. Recent advances in the understanding of the transition from deep inelastic scattering to photoproduction are summarized. Some brief comments are made on the recent HERA measurements of the ep NC and CC cross-sections at very high Q 2 .

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“…The trigger acceptance is greater than 97% for Q 2 > 10 GeV 2 and independent of Q 2 [17]. A total of about 7 · 10 6 events passed the TLT and was written to tape during the 1993 running period.…”

Section: Data Taking Conditionsmentioning

confidence: 99%

Inclusive charged particle distributions in deep inelastic scattering events at HERA

Derrick

Krakauer

Magill

et al. 1996

Z. Phys. C - Particles and Fields

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A measurement of inclusive charged particle distributions in deep inelastic ep scattering for γ * p centre-of-mass energies 75 < W < 175 GeV and momentum transfer squared 10 < Q 2 < 160 GeV 2 from the ZEUS detector at HERA is presented. The differential charged particle rates in the γ * p centre-of-mass system as a function of the scaled longitudinal momentum, x F , and of the transverse momentum, p * t and

, as a function of x F , W and Q 2 are given. Separate distributions are shown for events with (LRG) and without (NRG) a rapidity gap with respect to the proton direction. The data are compared with results from experiments at lower beam energies, with the naive quark parton model and with parton models including perturbative QCD corrections. The comparison shows the importance of the higher order QCD processes. Significant differences of the inclusive charged particle rates between NRG and LRG events at the same W are observed. The value of

for LRG events with a hadronic mass M X , which excludes the forward produced baryonic system, is similar to the

value observed in fixed target experiments at W ≈ M X .

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The ZEUS calorimeter first level trigger

Cited by 29 publications

References 3 publications

Diffractive photoproduction of dijets in ep collisions at HERA

Diffractive photoproduction of dijets in ep collisions at HERA

Structure Functions of the Nucleon and Their Interpretation

Inclusive charged particle distributions in deep inelastic scattering events at HERA

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