Energy reconstruction of the ATLAS Tile Calorimeter under high pile-up conditions using the Wiener filter

Dayane Oliveira Gonçalves

doi:10.1088/1742-6596/1525/1/012092

Abstract

The ATLAS experiment records data from the proton-proton collisions produced by the Large Hadron Collider (LHC). The Tile Calorimeter is the hadronic sampling calorimeter of ATLAS in the region . It uses iron absorbers and scintillators as active material. Jointly with the other calorimeters it is designed for reconstruction of hadrons, jets, -lepton and missing transverse energy. It also assists in muon identification. The energy deposited by the particles in the Tile Calorimeter is read out by approximately 10,000 channels. The signal provided by the readout electronics for each channel is digitized at 40 MHz and its amplitude is estimated by an optimal filtering algorithm. The increase of LHC luminosity leads to signal pile-up that deforms the signal of interest and compromises the amplitude estimation performance. This work presents the proposed algorithm, based on the Wiener filter theory, for energy estimation in the Tile Calorimeter under high pile-up conditions during LHC Run 3. The performance of the proposed method is studied under various pile-up conditions and compared with the current optimal filtering method using proton-proton collision data.

Highlights

ROOT [1] exists for more than two decades and from the beginning, it has its own graphics system
The new concepts of ROOT7 can be displayed directly in the browsers using the new classes for opening a new web window, communicate with the server and exchange data between front and back end and JavaScript ROOT (JSROOT)
There are three main components in the ROOT7 graphics model: a) The Pad is a base entity containing the list of graphics objects to be drawn and is implemented by the RPad class

Summary

Introduction

ROOT [1] exists for more than two decades and from the beginning, it has its own graphics system. RWebWindow Class The RWebWindow [12] class is a server-side entity in the new ROOT window management It displays windows in the web browser and manages multiple connections with the clients. There are three main components in the ROOT7 graphics model: a) The Pad is a base entity containing the list of graphics objects to be drawn and is implemented by the RPad class. In the new ROOT7, the batch output doesn’t rely on any dedicated ROOT graphics libraries, but it is based on the headless mode provided by the web browsers. In this mode, the graphics is generated in the background by the browser, re-using exactly the same code again and storing result in the output files

Example

Conclusion