Title:  LHCb High Level Trigger  design issues for post Long Stop 1 running

The LHCb High Level Trigger uses two stages of software running on an
Event Filter Farm (EFF) to select events for offline reconstruction
and analysis.  The first stage (Hlt1) processes approximately 1 MHz of
events accepted by a hardware trigger. In 2012, the second stage
(Hlt2) wrote 5 kHz to permanent storage for later processing.
Following the LHC's Long Stop 1 (anticipated end date 2015), the
machine energy will increase from 8 TeV in the center-of-mass to 13
TeV and the cross sections for beauty and charm are expected to grow
proportionately.  We plan to increase the Hlt2 output to 12 kHz, some
for immediate offline processing, some for later offline processing,
and some ready for immediate analysis. By increasing the absolute
computing power of the EFF, and buffering data for processing between
machine fills, we should be able to significantly increase the
efficiency for signal while improving signal-to-background ratios.  In
this poster we will present several strategies under consideration and
some of the tools we are using to evaluate these strategies.  

Summary

APS member ID
SO229064

Primary Authors:
Dr. ALBRECHT, Johannes (TU Dortmund) <albrecht@cern.ch>
Dr. GLIGOROV, Vladimir (CERN) <gligorov@cern.ch>
Prof. RAVEN, Gerhard (NIKHEF) <gerhard.raven@nikhef.nl>
Prof. SOKOLOFF, Michael (Cincinnati) <sokoloff@ucmail.uc.edu>
Prof. WILLIAMS, Michael (MIT) ""mwill@mit.edu"

Co-authors:

Abstract presenter:
Prof. SOKOLOFF, Michael


Track classification:
Accelerators, Detectors, and Computing

Presentation type: poster presentation

Comments: Abstract submitted for the LHCb collaboration, presenter
  will be Michael Sokoloff