11th International "Hiroshima" Symposium on the Development and Application of Semiconductor Tracking Detectors (HSTD11) in conjunction with 2nd Workshop on SOI Pixel Detectors (SOIPIX2017) at OIST, Okinawa, Japan

Novel technique for luminosity measurement using 3D pixel modules in the ATLAS detector.

10 Dec 2017, 20:52

1m

Conference Center (Okinawa Institute of Science and Technology Graduate University (OIST))

POSTER Large scale applications POSTER

Speaker

Peilian Liu (Lawrence Berkeley National Lab. (US))

Description

The Insertable b-Layer ( IBL ) is the innermost layer of the ATLAS
tracking system. It consists of planar pixel modules in the central
region and 3D modules at two extremities. We use the cluster length
distributions in 3D sensor modules of the IBL to determine the number of
primary charged particles per event and suppress backgrounds. This Pixel
Cluster Counting ( PCC ) algorithm provides a bunch-by-bunch luminosity
measurement. An accurate luminosity measurement is a key component for
precision measurements at the Large Hadron Collider and one of the
largest uncertainties on the luminosity determination in ATLAS arises
from the long-term stability of the measurement technique. The
comparison of the PCC algorithm with other existing algorithms provides
key insights in assessing and reducing such uncertainty.

Presentation materials

PCC_Lumi.pdf