ICPAQGP-2010

5-10 December 2010

6th International Conference on Physics and Astrophysics of Quark Gluon Plasma (ICPAQGP 2010)

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Studies of a high-pt trigger with the ALICE High-Level Trigger for p-p and Pb-Pb collisions

Content:

The ALICE experiment has started data-taking of p-p collisions at sqrt(s) = 7 TeV early this year and is expected to see first Pb-Pb collisions at sqrt(s_NN)=2.76 TeV in November 2010. Taking into account ALICE's limited storage capabilities, a high pt single particle trigger was studied in the High-Level Trigger to achieve a physics driven data-reduction and at the same time the enrichment of high pt charmonia in the stored data set. Input to the simulation is the measured performance of the on-line event reconstruction of the High-Level Trigger. The studies show that the efficiency is about 94% for pt-thresholds of 3 GeV/c while the purity drops to only 91%. Reduction factors of around 25 can be obtained. In the upcoming Pb-Pb collisions the HLT will give an on-line estimate on centrality and multiplicity which will be studied for a further enhancement of the high pt trigger. The studies and measurements of the ALICE High-Level Trigger high pt capabilities in both p-p and Pb-Pb collisions will be discussed in this presentation.

Collaboration:

for the ALICE Collaboration

Id:

141

Place:

Room: Main Auditorium

Starting date:

--not yet scheduled--

Duration:

00'

Primary Authors:

THAEDER, Jochen (GSI, Germany)

Presenters:

THAEDER, Jochen