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playground:niccolo_a_pietrobono2021

Muon detection in electron-positron annihilation formuon collider studies

Introduction

The LEMMA project aims to study the possibility of producing muonsfrom the $e^+e^-$ annihilation process. A high intensity positron beam, with energyjust above the43.7 GeVthreshold 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 E3 in the central LG unit. Fig. 3 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 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: $$\varepsilon_j=\frac{N_4}{N_3(j)}$$ 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.

Qualche imprecisione ma va bene. Ti do 1h di lavoro a casa

playground/niccolo_a_pietrobono2021.txt · Ultima modifica: 2021/12/09 07:28 da fausto.casaburo