Long-lived particle reconstruction downstream of the LHCb magnet
Charged-particle trajectories are usually reconstructed with the LHCb detector using combined information from the tracking devices placed upstream and downstream of the 4 T m dipole magnet. Trajectories reconstructed using only information from the tracker downstream of the dipole magnet, which...
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| Format: | Article |
| Language: | English |
| Published: |
Springer Berlin Heidelberg
2025
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| Online Access: | https://hdl.handle.net/1721.1/158039 |
| Summary: | Charged-particle trajectories are usually reconstructed with the LHCb detector using combined information
from the tracking devices placed upstream and downstream
of the 4 T m dipole magnet. Trajectories reconstructed using
only information from the tracker downstream of the dipole
magnet, which are referred to as T tracks, have not been used
for physics analysis to date. The challenges of the reconstruction of long-lived particles with T tracks for physics use are
discussed and solutions are proposed. The feasibility and the
tracking performance are studied using samples of long-lived
and K0
S hadrons decaying between 6.0 and 7.6 m downstream of the proton–proton collision point, thereby traversing most of the magnetic field region and providing maximal sensitivity to magnetic and electric dipole moments. The
reconstruction can be expanded upstream to about 2.5 m for
use in direct searches of exotic long-lived particles. The data
used in this analysis have been recorded between 2015 and
2018 and correspond to an integrated luminosity of 6 fb−1.
The results obtained demonstrate the possibility to further
extend the decay volume and the physics reach of the LHCb
experiment. |
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