The ZEUS first level tracking trigger

Heath, G. P.; Foster, B.; Short, T.L.; Wilson, Stephen; Lancaster, MA; Shield, P.D.; Wilson, F. F.; Biltzinger, J.; Diekmann, B.; Mass, A.; Middleton, Akil J.; Madani, S.

doi:10.1016/0168-9002(92)90741-l

Cited by 10 publications

(3 citation statements)

References 2 publications

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“…The first level trigger (FLT) [163,164] consisted of hardware trigger systems in individual sub-detectors, which sent the information to the global first level trigger (GFLT) to perform the decision. Events that passed the GFLT were processed further by the second level trigger (SLT), based on software triggers, which used information on charged-particle tracks, the interaction vertex, calorimeter timing and global energy sums [165].…”

Section: Zeus Detectormentioning

confidence: 99%

Charm production and QCD analysis at HERA and LHC

Zenaiev

2017

Eur. Phys. J. C

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This review is devoted to the study of charm production in ep and pp collisions. The total set of measurements obtained by the two collaborations H1 and ZEUS from HERA and their combination is outlined, as well as complementary data obtained by the LHCb Collaboration at the LHC. After fitting the parton distribution functions the charm-production cross sections are predicted within perturbative QCD at next-to-leading order using the fixed-flavournumber scheme. Agreement with the data is found. The combined HERA charm data are sensitive to the c-quark mass and enabled its accurate determination. The predictions crucially depend upon the knowledge of the gluon distribution function. It is shown that the shape of the gluon distribution based on the HERA data is considerably improved by adding the measurements from LHCb and applicable down to values x of about 10 −6 , where x is the proton momentum fraction carried by a parton.

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Section: Zeus Detectormentioning

confidence: 99%

Charm production and QCD analysis at HERA and LHC

Zenaiev

2017

Eur. Phys. J. C

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“…To reduce the event rate from the highest collision rate ≈ 10 MHz to technically acceptable ≈ 10 Hz, a three-level trigger system was used at ZEUS. The First Level Trigger (FLT) [163,164] consisted of hardware trigger systems in individual sub-detectors, which sent the information to the Global First Level Trigger (GFLT) to perform the decision. Events that passed the GFLT were processed further by the Second Level Trigger (SLT), based on software triggers, which used information on charged-particle tracks, the interaction vertex, calorimeter timing and global energy sums [165].…”

Section: Zeus Detectormentioning

confidence: 99%

Charm Production and QCD Analysis at HERA and LHC

Zenaiev

2016

Preprint

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This review is devoted to the study of charm production in ep and pp collisions. The total set of measurements obtained by the two collaborations H1 and ZEUS from HERA and their combination is outlined, as well as complementary data obtained by the LHCb collaboration at the LHC. After fitting the parton distribution functions the charm production cross sections are predicted within perturbative QCD at next-to-leading order using the fixed-flavour-number scheme. Agreement with the data is found. The combined HERA charm data are sensitive to the c-quark mass and enabled its accurate determination. The predictions crucially depend upon the knowledge of the gluon distribution function. It is shown that the shape of the gluon distribution based on the HERA data is considerably improved by adding the measurements from LHCb and applicable down to values x of about 10 −6 , where x is the proton momentum fraction carried by a parton.

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“…Spatial information is not only useful for physics triggers but also for detector calibration and trouble-shooting purposes. Comparable collider experiment L1 triggers [9][10][11][12][13][14][15][16][17][18][19][20][21] in general only apply conditions based on objects exceeding fixed energy or momentum thresholds and do not calculate spatial relations between them. At most trigger information arranged in an η-φ matrix structure is exploited using simple logical functions.…”

Section: Introductionmentioning

confidence: 99%

Concept of the First Level Global Trigger for the CMS experiment at LHC

Wulz

2001

Nuclear Instruments and Methods in Physics Research Section A:

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The requirements, the principles and the design of the First Level Global Trigger Processor of the CMS experiment under construction at the CERN Large Hadron Collider are described. A trigger decision based on trigger objects delivered by the detector subsystems is provided for each beam crossing at a rate of 40 MHz. The Global Trigger comprises a novel concept where event selection is not only based on objects exceeding energy or momentum thresholds but also on complex event topology, which is made possible by the availability of space, charge and quality information in the algorithm calculations. The trigger logic is largely programmable in order to satisfy all possible physics requirements.

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The ZEUS first level tracking trigger

Cited by 10 publications

References 2 publications

Charm production and QCD analysis at HERA and LHC

Charm production and QCD analysis at HERA and LHC

Charm Production and QCD Analysis at HERA and LHC

Concept of the First Level Global Trigger for the CMS experiment at LHC

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