TY  - JOUR
AU  - LHCb Collaboration (Aaij, R. et al
AU  - Garcia Martin, L. M.
AU  - Henry, L.
AU  - Jashal, B. K.
AU  - Martinez-Vidal, F.
AU  - Oyanguren, A.
AU  - Remon Alepuz, C.
AU  - Ruiz Vidal, J.
AU  - Sanchez Mayordomo, C.
PY  - 2019
DA  - 2019//
TI  - Measurement of the electron reconstruction efficiency at LHCb
T2  - J. Instrum.
JO  - Journal of Instrumentation
SP  - P11023 - 20pp
VL  - 14
PB  - Iop Publishing Ltd
KW  - Pattern recognition
KW  - cluster finding
KW  - calibration and fitting methods
KW  - Performance of High Energy Physics Detectors
AB  - The single electron track-reconstruction efficiency is calibrated using a sample corresponding to 1.3 fb(-1) of pp collision data recorded with the LHCb detector in 2017. This measurement exploits B+ -> J/psi (e(+)e(-))K+ decays, where one of the electrons is fully reconstructed and paired with the kaon, while the other electron is reconstructed using only the information of the vertex detector. Despite this partial reconstruction, kinematic and geometric constraints allow the B meson mass to be reconstructed and the signal to be well separated from backgrounds. This in turn allows the electron reconstruction efficiency to be measured by matching the partial track segment found in the vertex detector to tracks found by LHCb's regular reconstruction algorithms. The agreement between data and simulation is evaluated, and corrections are derived for simulated electrons in bins of kinematics. These correction factors allow LHCb to measure branching fractions involving single electrons with a systematic uncertainty below 1%.
SN  - 1748-0221
UR  - https://arxiv.org/abs/1909.02957
UR  - https://doi.org/10.1088/1748-0221/14/11/P11023
DO  - 10.1088/1748-0221/14/11/P11023
LA  - English
N1  - WOS:000507589800023
ID  - LHCbCollaborationAaij_etal2019
ER  -