Strumenti Utente

Strumenti Sito


playground:francesco_p_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 43.7GeV threshold for muon pair production through the $e^+e^-\rightarrow \mu^+ \mu^-$ process, impinging on a low $Z$ fixed target could produce muons with naturally small divergence, resulting in a low transverse emittance.

Tracker- absorbers correlation

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 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 22GeV 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: Efficiencies to detect a 22 GeV muon in each of the fused silica HORSA layers together with the overall HORSA efficiency.

Nota

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 arxiv:2105.12624

Commento di Fausto C.

Bene, ti aggiungo 1h di lavoro a casa

playground/francesco_p_pietrobono2021.txt · Ultima modifica: 2021/12/11 07:58 da fausto.casaburo