Simulation of different options of the Inner Tracker for Novosibirsk Super Charm-Tau Factory Detector

T.V Maltsev,A.V Sokolov,V.K Vadakeppattu,L.I Shekhtman,M.N Achasov,F.V Ignatov,P.P Krokovny

doi:10.1051/epjconf/201921201011

T.V Maltsev, A.V Sokolov + Show 5 more

Open Access

https://doi.org/10.1051/epjconf/201921201011

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Abstract

Inner Tracker of Novosibirsk Super Charm-Tau Factory Detector has to measure momenta of soft hadrons, which do not reach the drift chamber; complement the drift chamber in measuring the momenta; detect secondary vertices of short-lived particles. Thus, proper choice of the option for the Inner Tracker is of significant interest. The simulation of charged pions propagation in the perpendicular direction to the beam axis was carried out with DD4HEP program based on GEANT4. Three options were considered: 4-layered Silicon microstrip detector, 4-layered cylindrical Gas Electron Multiplier (GEM) detector and Time Projection Chamber (TPC). The simulated Detector was located in 1.5 T magnetic field directed along beam axis. The simulation shows that pions with initial momenta less than 50 MeV/c do not pass through the beampipe and cannot be registered. Pions with momenta above 65 MeV/c leave energy depositions in all 4 layers of the Inner Tracker based on Silicon, and their trajectories can be reconstructed. Cylindrical GEM detector provides reconstruction possibility (hits in 4 layers) for pions with momenta more than 60 MeV/c. TPC with thin inner wall provides reconstruction of pions with momenta higher than 55 MeV/c. However, in this case the reconstruction procedure will be much more complicated due to a large number of background particle tracks in the sensitive volume.

Highlights

Physics program of experiments at the Novosibirsk Super Charm-Tau Factory Detector [1] with a peak luminosity of 1035cm−2 s−1 in the energy region 2E = 2 − 7 GeV is dedicated to studies of rare decays of D mesons, τ lepton, D0D0 oscillations and searches for so-far unobserved lepton-flavor-violating τ decays, in particular, τ → μγ decay
Second option of the Inner Tracker is based on 4 layers of triple Gas Electron Multiplier (GEM) detectors (Fig. 5)
Starting from pπ = 55 MeV/c two GEM layers can be reached by pions

Summary

Introduction

The proposed program requires the development of a universal magnetic detector (Fig. 1). Inner Tracker is placed between the vacuum chamber and the drift chamber. It provides the detection solid angle up to 98%. Inner Tracker complements the drift chamber in measuring the momenta of charged particles. The determination of minimum momentum, starting from which the pion reconstruction becomes possible with Inner Tracker, was the subject of current simulation. Pions with different momenta were directed perpendicular to the Inner Tracker axis. Beampipe (vacuum pipe) in the simulation consists of 3.0 mm of Beryllium and 0.5 mm of Paraffin. The simulation was carried out for three options of Inner Tracker: 1. For-layered cylindrical GEM detector [5], [6]; 3.

Four-layered Silicon-strips detector

Four-layered GEM detector

Time Projection Chamber

Findings

Conclusions