TY  - JOUR
AU  - LHCb Collaboration (Aaij, R. et al
AU  - Fernandez Casani, A.
AU  - Jaimes Elles, S. J.
AU  - Jashal, B. K.
AU  - Libralon, S.
AU  - Martinez-Vidal, F.
AU  - Mazorra de Cos, J.
AU  - Oyanguren, A.
AU  - Rebollo De Miguel, M.
AU  - Sanderswood, I.
AU  - Zhuo, J.
PY  - 2025
DA  - 2025//
TI  - Long-lived particle reconstruction downstream of the LHCb magnet
T2  - Eur. Phys. J. C
JO  - European Physical Journal C
SP  - 7 - 30pp
VL  - 85
IS  - 1
PB  - Springer
AB  - 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 Lambda and K-S(0) 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.
SN  - 1434-6044
UR  - https://arxiv.org/abs/2211.10920
UR  - https://doi.org/10.1140/epjc/s10052-024-13686-6
DO  - 10.1140/epjc/s10052-024-13686-6
LA  - English
N1  - WOS:001406553500001
ID  - LHCbCollaborationAaij_etal2025
ER  -