The ATLAS Muon Trigger “Slice”

Sidoti, A.; Bellomo, M.; Biglietti, M.; Carlino, G.; Cataldi, G.; Conventi, F.; Cecco, S. De; DiMattia, A.; Dionisi, C.; Falciano, S.; Giagu, S.; Gorini, E.; Grancagnolo, S.; Inada, M.; Kanaya, M.; Kono, T.; Krasznahorkay, A.; Kiyamura, H.; Kurashige, H.; Kuwabara, T.; Luci, C.; Luminari, L.; Marzano, F.; Migliaccio, A.; Nagano, K.; Nisati, A.; Omachi, C.; Panikashvili, N.; Pasqualucci, E.; Primavera, M.; Rescigno, M.; Riu, I.; Ryan, P.; Scannicchio, D.A.; Siragusa, G.; Spagnolo, S.; Tarem, S.; Tarem, Z.; Tokushuku, K.; Usai, G.; Ventura, A.; Vercesi, V.; Yamazaki, Y.

doi:10.1109/tns.2007.912883

Cited by 4 publications

(4 citation statements)

References 3 publications

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“…a muon trigger threshold of 10 GeV. For muons with p T > 10 GeV, the trigger efficiency is 80% [39,40]; in this way we avoid the need to pre-scale without losing too much signal. It should be noted that we still need to employ the p T > 10 GeV analysis cut since the MU10 trigger does not directly measure the muon p T , which results in the acceptance of some muons with p T below 10 GeV.…”

Section: Triggeringmentioning

confidence: 99%

“…Such a trigger would have an efficiency of 80% for muons with p T > 15 GeV, but would retain some efficiency for p T values in the region 10 − 15 GeV. In [40], results are presented for the L1 muon trigger efficiencies for 11 GeV and 20 GeV thresholds and from these results it is apparent that the efficiency for triggering on 10 GeV muons given a 15 GeV threshold will be between 20% and 50%. We choose to model the efficiency of a MU15 trigger with a linear turn-on, with 20% efficiency at 10 GeV and 80% efficiency at 15 GeV.…”

Section: Triggeringmentioning

confidence: 99%

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Reinstating the `no-lose' theorem for NMSSM Higgs discovery at the LHC

Forshaw¹,

Gunion²,

Hodgkinson³

et al. 2008

J. High Energy Phys.

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The simplest supersymmetric model that solves the µ problem and in which the GUT-scale parameters need not be finely tuned in order to predict the correct value of the Z boson mass at low scales is the Next-to-Minimal Supersymmetric Standard Model (NMSSM). However, in order that fine tuning be absent, the lightest CP-even Higgs boson h should have mass ∼ 100 GeV and SM couplings to gauge bosons and fermions. The only way that this can be consistent with LEP limits is if h decays primarily via h → aa → τ + τ − τ + τ − or 4j but not 4b, where a is the lighter of the two pseudo-scalar Higgses that are present in the NMSSM. Interestingly, m a < 2m b is natural in the NMSSM with m a > 2m τ somewhat preferred. Thus, h → τ + τ − τ + τ − becomes a key mode of interest. Meanwhile, all other Higgs bosons of the NMSSM are typically quite heavy. Detection of any of the NMSSM Higgs bosons at the LHC in this preferred scenario will be very challenging using conventional channels. In this paper, we demonstrate that the h → aa → τ + τ − τ + τ − decay chain should be visible if the Higgs is produced in the process pp → p + h + p with the final state protons being measured using suitably installed forward detectors. Moreover, we show that the mass of both the h and the a can be determined on an event-by-event basis.

show abstract

Section: Triggeringmentioning

confidence: 99%

Section: Triggeringmentioning

confidence: 99%

Reinstating the `no-lose' theorem for NMSSM Higgs discovery at the LHC

Forshaw¹,

Gunion²,

Hodgkinson³

et al. 2008

J. High Energy Phys.

View full text Add to dashboard Cite

show abstract

“…The transverse muon momentum is determined as an output of a Look Up Table (LUT) whose entries are radius, φ and η at the entrance of the MS. The expected resolutions as a function of muon momentum in the barrel region are shown in Fig.5 [6]. For muons in the Endcap region, the pattern recognition starts from the TGC detectors in the middle muon station.…”

Section: A Level-2mentioning

confidence: 99%

“…These events will provide a real signal of a minimum ionizing particle (MIP) and a clear track which can be used for checking the whole trigger chain. Only events from a portion of the MS, the one closest to the bottom 6 , have been collected and analyzed. The trigger algorithms in the muon slice are mostly designed to work for proton-proton collision events while having poor efficiencies for comics data.…”

Section: Commissioningmentioning

confidence: 99%

The ATLAS Muon Trigger "Slice"

Sidoti

Bellomo

Biglietti

et al. 2007

2007 15th IEEE-NPSS Real-Time Conference

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Abstract-The ATLAS experiment at the LHC will face the challenge of selecting interesting candidate events in protonproton collisions at 14 TeV center of mass energy, while rejecting the enormous number of background events. The trigger system architecture is organized in three levels. From a bunch crossing rate of 40 MHz the First Level trigger, hardware implemented, will reduce this rate to around ∼75 kHz. Then the software based High Level Trigger (HLT), composed by the Second Level Trigger and the Event Filter reduces the rate to ∼ 200 Hz. HLT is implemented on commercial CPUs using a framework built on the common ATLAS object oriented software architecture. Inclusive trigger selections are used to collect events for the ATLAS physics program; final states with muons are crucial for Electroweak precision measurements as well as Higgs and SUSY searches. In this paper we will present the implementation of the muon slice, signal efficiencies, background rejection rates and system performances (execution time,...) for online muon selection based on MonteCarlo simulations and results obtained on real events collected during cosmic data taking runs.

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Integration of the Trigger and Data Acquisition Systems in ATLAS

Riu¹,

Abolins

Adragna

et al. 2008

IEEE Trans. Nucl. Sci.

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Abstract-During 2006 and spring 2007, integration and commissioning of trigger and data acquisition (TDAQ) equipment in the ATLAS experimental area has progressed. Much of the work has focused on a final prototype setup consisting of around eighty computers representing a subset of the full TDAQ system. There have been a series of technical runs using this setup. Various tests have been run including ones where around 6k Level-1 pre-selected simulated proton-proton events have been processed in a loop mode through the trigger and dataflow chains. The system included the readout buffers containing the events, event building, second level and third level trigger algorithms. Quantities critical for the final system, such as event processing times, have been studied using different trigger algorithms as well as different dataflow components.

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The ATLAS Muon Trigger “Slice”

Cited by 4 publications

References 3 publications

Reinstating the `no-lose' theorem for NMSSM Higgs discovery at the LHC

Reinstating the `no-lose' theorem for NMSSM Higgs discovery at the LHC

The ATLAS Muon Trigger "Slice"

Integration of the Trigger and Data Acquisition Systems in ATLAS

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