Aachen 2019 – wissenschaftliches Programm
Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe
T: Fachverband Teilchenphysik
T 20: Detektorsysteme I
T 20.9: Vortrag
Montag, 25. März 2019, 18:00–18:15, ST 4
The beam induced background in the ATLAS semiconductor tracker — •Edoardo Rossi1, Christian Sander1, and Saverio D'Auria2 — 1DESY — 2University of Milan
The Beam Induced Background (BIB) is composed of particles generated by the interaction of the LHC beam with the environment, for example gas molecules in the beam pipe. Studying the characteristics of the BIB is crucial to estimate and reject this background, which plays a signicant role, for example, in mono-jet analyses and in searches for rare events, where even the smallest backgrounds needs to be estimated accurately.
In this presentation, results from the analysis of the BIB in the Semiconductor Tracker (SCT) of the ATLAS experiment are shown. To disentagle the effect of the BIB from collision fragments, events with unpaired proton bunches are exploited. A signicant signature of the BIB particles arises from the timing of their hits, which has the effect of creating an asymmetric hit distribution in the two SCT end caps. Using this signature, it is possible to further select events with a large BIB component.
In this talk, the hit density and distribution of the BIB measured in the SCT are discussed.