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playground:gaia_g_pietrobono2021

Muon detection in electron-positron annihilation for muon collider studies

Introduction

The LEMMA project aims to study the possibility of producing muons from the $e^+$ $e^-$ annihilation process. A high intensity positron beam, with energy just above the 43.7 GeV threshold for muon pair production through the $e^+$ $e^-$→$µ^+$ $µ^-$ process.

Tracker- absorbers correlation

As mentioned before, the experimental apparatus is arranged so that the magnet deflects particles with energy $E_0$ towards the central unit of the LG. As a first step, this analysis studied the relation between the particle’s x position measured by the tracker positioned before the first scintillator of the negative arm and the energy released $E_3$ in the central LG unit. Fig. 1 shows the average 10 electron (muon) released energy $\left\langle E_3 \right\rangle$ in the central LG unit in blue (green), as a function of the x position measured by the tracker.

Figure 1: Average energy released $\left\langle E_3 \right\rangle$ by 22 GeV electrons (blue, on the top) and muons (green, on the bottom) in the central LG unit as a function of the local x position measured by the tracker. Vertical solid lines are used to mark the region 6 cm < x < 9 cm, considered for further analysis.

HOrizontal Smart Absorber efficiency

The efficiency of each HORSA active layer has been studied using a muon beam with energy $E_0$. The efficiency of each HORSA active layer j = 5, 6, 7, 8 is defined as: $$\varepsilon_{j}=\frac{N_{4}}{N_{3}\left(j\right)}$$

where $N_4$ represents the number of events with signals in time coincidence in all four layers while $N_3$(j) represents the number of events with signals in time coincidence in all the layers but the j one. The overall efficiency of the HORSA absorber is defined as $$\varepsilon_{\text{HORSA}}=\prod_{j=5}^{8}\varepsilon_{j}$$

Results obtained from the run with a muon beam of energy $E_0$ and no target in place are given in Tab. 1, together with the corresponding statistical uncertainties evaluated assuming binomial statistics.

$j$ $\varepsilon_{j}\left(\%\right)$ $\varepsilon_{HORSA}\left(\%\right)$
5$ 97.04\pm0.56$$84.2\pm1.4$
6$ 95.50\pm0.66$
7$ 93.26\pm0.98$
8$ 97.44\pm0.79$

Table 1: Table 1: Efficiencies to detect a 22 GeV muon in each of the fused silica HORSA layers together with the overall HORSA efficiency, as defined in Equations 1 and 2 respectively.

Questa è una pagina di prova di utilizzo di Wiki Lab2Go. Il testo, la figura e la tabella riportati sono stati presi dall'articolo scientifico [[https://arxiv.org/abs/2105.12624|arxiv:2105.12624]]

Commento Fausto C.

Qualche imprecisione (es. non hai centrato la figura, la nota è scritta male, non hai usato latex per scrivere $\mu$), ma comunque nel complesso va bene. Ti do 1h di lavoro a casa

playground/gaia_g_pietrobono2021.txt · Ultima modifica: 2022/01/11 11:40 da fausto.casaburo