TY - JOUR

T1 - Measurement of the electron reconstruction efficiency at LHCb

AU - The LHCb Collaboration

AU - Aaij, R.

AU - Beteta, C. Abellan

AU - Ackernley, T.

AU - Adeva, B.

AU - Adinolfi, M.

AU - Afsharnia, H.

AU - Aidala, C. A.

AU - Aiola, S.

AU - Ajaltouni, Z.

AU - Akar, S.

AU - Albicocco, P.

AU - Albrecht, J.

AU - Alessio, F.

AU - Alexander, M.

AU - Albero, A. Alfonso

AU - Alkhazov, G.

AU - Cartelle, P. Alvarez

AU - Alves Jr, A. A.

AU - Amato, S.

AU - Amhis, Y.

AU - An, L.

AU - Anderlini, L.

AU - Andreassi, G.

AU - Andreotti, M.

AU - Archilli, F.

AU - Romeu, J. Arnau

AU - Artamonov, A.

AU - Artuso, M.

AU - Arzymatov, K.

AU - Aslanides, E.

AU - Atzeni, M.

AU - Audurier, B.

AU - Bachmann, S.

AU - Back, J. J.

AU - Baker, S.

AU - Balagura, null

AU - Baldini, W.

AU - Baranov, A.

AU - Barlow, R. J.

AU - Barsuk, S.

AU - Barter, W.

AU - Bartolini, M.

AU - Baryshnikov, F.

AU - Bassi, G.

AU - Batozskaya, null

AU - Batsukh, B.

AU - Battig, A.

AU - Bondar, A.

AU - Maltsev, T.

AU - Shekhtman, L.

AU - Кроковный, Павел Петрович

AU - Эйдельман, Семен Исаакович

AU - Кудрявцев, Василий Николаевич

AU - Воробьев, Виталий Сергеевич

PY - 2019/11/22

Y1 - 2019/11/22

N2 - 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/ψ(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%.

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/ψ(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%.

KW - Pattern recognition, cluster finding, calibration and fitting methods

KW - Performance of High Energy Physics Detectors

KW - DECAY

KW - calibration and fitting methods; Performance of High Energy Physics Detectors

KW - cluster finding

KW - Pattern recognition

UR - http://www.scopus.com/inward/record.url?scp=85081981429&partnerID=8YFLogxK

U2 - 10.1088/1748-0221/14/11/P11023

DO - 10.1088/1748-0221/14/11/P11023

M3 - Article

VL - 14

JO - Journal of Instrumentation

JF - Journal of Instrumentation

SN - 1748-0221

IS - 11

M1 - P11023

ER -