Very Forward Calorimetry at the LHC-Recent results from ATLAS.

Authors :: White, Sebastian N.
Source :: AIP Conference Proceedings; 7/18/2011, Vol. 1350 Issue 1, p95-101, 7p, 2 Graphs
Publication Year :: 2011
Abstract: We present first results from the ATLAS Zero Degree Calorimeters (ZDC) based on 7 TeV pp collision data recorded in 2010. The ZDC coverage of ±∼350 μrad about the forward direction makes possible the measurement of neutral particles (primarily π<superscript>0</superscript>'s and neutrons) over the kinematic region x<subscript>F</subscript>>=0.1 and out to p<subscript>T</subscript><=1.2 GeV/c at large x<subscript>F</subscript>. The ATLAS ZDC is unique in that it provides a complete image of both electromagnetic and hadronic showers. This is illustrated with the reconstruction of π<superscript>0</superscript>'s with energies of 0.7-3.5 TeV. We also discuss the waveform reconstruction algorithm which has allowed good time-of-flight resolution on leading neutrons emerging from the collisions despite the sparse (40 MHz) sampling of the calorimeter signals used. [ABSTRACT FROM AUTHOR]