Novel photon timing techniques applied to the LHCb RICH upgrade programme Floris Keizer on behalf of the LHCb RICH collaboration

2025-05-02 0 0 1.79MB 4 页 10玖币
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Novel photon timing techniques applied to the LHCb
RICH upgrade programme
Floris Keizer on behalf of the LHCb RICH collaboration
CERN, 1211 Meyrin, Switzerland
E-mail: floris.keizer@cern.ch
Abstract. The Ring-Imaging Cherenkov (RICH) detectors at LHCb have an intrinsic time
resolution of better than 10 ps owing to the prompt Cherenkov radiation and focusing mirrors
optics. While only spatial information has been used in the experiment to date, the addition
of photon time information is one of the cornerstones of the future RICH upgrade programme.
The novel timing techniques provide a powerful tool for background suppression and particle
ID performance improvements. Here, developments to implement fast-timing in the front-end
electronics are presented.
1. Introduction
The LHCb upgrade programme aims to develop a novel time-resolved RICH detector with
increasingly precise photon detector time resolution as outlined in Figure 1. This new avenue
relies on the fact that for a given track the time-of-arrival (ToA) of Cherenkov photons on the
detector plane can be predicted with an accuracy better than 10 ps as shown in Figure 2 and
has been demonstrated using the LHCb simulation framework [1]. The analytic prediction of
the ToA in the RICH pattern recognition algorithms takes into account the LHCb tracking
information, the track curvature in the LHCb magnetic field, the reconstructed photon paths
in the RICH detector and the primary vertex (PV) time. For each track, a time gate can be
applied in software around the predicted hit time, and only the hits arriving within this time
gate are used for particle ID on that track. As illustrated in Figure 3, this significantly reduces
combinatorial background in particular from photons originating from one PV being associated
with tracks originating from another PV. This is a powerful tool to improve the particle ID
performance. Since the width of the software time gate is dictated by the time spread of the
photon sensor and front-end (FE) electronics, these concepts motivate the RICH community
to seek fast-timing technologies for the transition to the HL-LHC. A time gate of ±2σsensor
Figure 1. Overview of the proposed upgrades of the RICH photon detector.
arXiv:2210.15309v1 [physics.ins-det] 27 Oct 2022
摘要:

NovelphotontimingtechniquesappliedtotheLHCbRICHupgradeprogrammeFlorisKeizeronbehalfoftheLHCbRICHcollaborationCERN,1211Meyrin,SwitzerlandE-mail:floris.keizer@cern.chAbstract.TheRing-ImagingCherenkov(RICH)detectorsatLHCbhaveanintrinsictimeresolutionofbetterthan10psowingtothepromptCherenkovradiationand...

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