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The following article is Open access
Measurement of the electron reconstruction efficiency at LHCb
R. Aaij30, C. Abellán Beteta47, T. Ackernley57, B. Adeva44, M. Adinolfi51, H. Afsharnia8, C.A. Aidala78, S. Aiola24, Z. Ajaltouni8, S. Akar62, P. Albicocco21, J. Albrecht13, F. Alessio45, M. Alexander56, A. Alfonso Albero43, G. Alkhazov36, P. Alvarez Cartelle58, A.A. Alves Jr44, S. Amato2, Y. Amhis10, L. An20, L. Anderlini20, G. Andreassi46, M. Andreotti19, F. Archilli15, J. Arnau Romeu9, A. Artamonov42, M. Artuso65, K. Arzymatov40, E. Aslanides9, M. Atzeni47, B. Audurier25, S. Bachmann15, J.J. Back53, S. Baker58, V. Balagura10,80, W. Baldini19,45, A. Baranov40, R.J. Barlow59, S. Barsuk10, W. Barter58, M. Bartolini22,86, F. Baryshnikov74, G. Bassi27, V. Batozskaya34, B. Batsukh65, A. Battig13, V. Battista46, A. Bay46, M. Becker13, F. Bedeschi27, I. Bediaga1, A. Beiter65, L.J. Bel30, V. Belavin40, S. Belin25, N. Beliy4, V. Bellee46, K. Belous42, I. Belyaev37, G. Bencivenni21, E. Ben-Haim11, S. Benson30, S. Beranek12, A. Berezhnoy38, R. Bernet47, D. Berninghoff15, H.C. Bernstein65, E. Bertholet11, A. Bertolin26, C. Betancourt47, F. Betti18,83, M.O. Bettler52, Ia. Bezshyiko47, S. Bhasin51, J. Bhom32, M.S. Bieker13, S. Bifani50, P. Billoir11, A. Birnkraut13, A. Bizzeti20,99, M. BjØrn60, M.P. Blago45, T. Blake53, F. Blanc46, S. Blusk65, D. Bobulska56, V. Bocci29, O. Boente Garcia44, T. Boettcher61, A. Boldyrev75, A. Bondar41,102, N. Bondar36, S. Borghi45,59, M. Borisyak40, M. Borsato15, J.T. Borsuk32, M. Boubdir12, T.J.V. Bowcock57, C. Bozzi19,45, S. Braun15, A. Brea Rodriguez44, M. Brodski45, J. Brodzicka32, A. Brossa Gonzalo53, D. Brundu25,45, E. Buchanan51, A. Buonaura47, C. Burr45, A. Bursche25, J.S. Butter30, J. Buytaert45, W. Byczynski45, S. Cadeddu25, H. Cai69, R. Calabrese19,85, S. Cali21, R. Calladine50, M. Calvi23,87, M. Calvo Gomez43,91, A. Camboni43,91, P. Campana21, D.H. Campora Perez45, L. Capriotti18,83, A. Carbone18,83, G. Carboni28, R. Cardinale22,86, A. Cardini25, P. Carniti23,87, K. Carvalho Akiba30, A. Casais Vidal44, G. Casse57, M. Cattaneo45, G. Cavallero22, R. Cenci27,94, J. Cerasoli9, M.G. Chapman51, M. Charles11,45, Ph. Charpentier45, G. Chatzikonstantinidis50, M. Chefdeville7, V. Chekalina40, C. Chen3, S. Chen25, A. Chernov32, S.-G. Chitic45, V. Chobanova44, M. Chrzaszcz45, A. Chubykin36, P. Ciambrone21, M.F. Cicala53, X. Cid Vidal44, G. Ciezarek45, F. Cindolo18, P.E.L. Clarke55, M. Clemencic45, H.V. Cliff52, J. Closier45, J.L. Cobbledick59, V. Coco45, J.A.B. Coelho10, J. Cogan9, E. Cogneras8, L. Cojocariu35, P. Collins45, T. Colombo45, A. Comerma-Montells15, A. Contu25, N. Cooke50, G. Coombs56, S. Coquereau43, G. Corti45, C.M. Costa Sobral53, B. Couturier45, G.A. Cowan55, D.C. Craik61, A. Crocombe53, M. Cruz Torres1, R. Currie55, C.L. Da Silva64, E. Dall'Occo30, J. Dalseno44,51, C. D'Ambrosio45, A. Danilina37, P. d'Argent15, A. Davis59, O. De Aguiar Francisco45, K. De Bruyn45, S. De Capua59, M. De Cian46, J.M. De Miranda1, L. De Paula2, M. De Serio17,82, P. De Simone21, J.A. de Vries30, C.T. Dean64, W. Dean78, D. Decamp7, L. Del Buono11, B. Delaney52, H.-P. Dembinski14, M. Demmer13, A. Dendek33, V. Denysenko47, D. Derkach75, O. Deschamps8, F. Desse10, F. Dettori25, B. Dey6, A. Di Canto45, P. Di Nezza21, S. Didenko74, H. Dijkstra45, F. Dordei25, M. Dorigo27,103, A.C. dos Reis1, A. Dosil Suárez44, L. Douglas56, A. Dovbnya48, K. Dreimanis57, M.W. Dudek32, L. Dufour45, G. Dujany11, P. Durante45, J.M. Durham64, D. Dutta59, R. Dzhelyadin42, M. Dziewiecki15, A. Dziurda32, A. Dzyuba36, S. Easo54, U. Egede58, V. Egorychev37, S. Eidelman41,102, S. Eisenhardt55, R. Ekelhof13, S. Ek-In46, L. Eklund56, S. Ely65, A. Ene35, S. Escher12, S. Esen30, T. Evans45, A. Falabella18, J. Fan3, N. Farley50, S. Farry57, D. Fazzini10, M. Féo45, P. Fernandez Declara45, A. Fernandez Prieto44, F. Ferrari18,83, L. Ferreira Lopes46, F. Ferreira Rodrigues2, S. Ferreres Sole30, M. Ferro-Luzzi45, S. Filippov39, R.A. Fini17, M. Fiorini19,85, M. Firlej33, K.M. Fischer60, C. Fitzpatrick45, T. Fiutowski33, F. Fleuret10,80, M. Fontana45, F. Fontanelli22,86, R. Forty45, V. Franco Lima57, M. Franco Sevilla63, M. Frank45, C. Frei45, D.A. Friday56, J. Fu24,95, W. Funk45, E. Gabriel55, A. Gallas Torreira44, D. Galli18,83, S. Gallorini26, S. Gambetta55, Y. Gan3, M. Gandelman2, P. Gandini24, Y. Gao3, L.M. Garcia Martin77, J. García Pardiñas47, B. Garcia Plana44, F.A. Garcia Rosales10, J. Garra Tico52, L. Garrido43, D. Gascon43, C. Gaspar45, G. Gazzoni8, D. Gerick15, E. Gersabeck59, M. Gersabeck59, T. Gershon53, D. Gerstel9, Ph. Ghez7, V. Gibson52, A. Gioventù44, O.G. Girard46, P. Gironella Gironell43, L. Giubega35, C. Giugliano19, K. Gizdov55, V.V. Gligorov11, C. Göbel67, D. Golubkov37, A. Golutvin58,74, A. Gomes1,79, I.V. Gorelov38, C. Gotti23,87, E. Govorkova30, J.P. Grabowski15, R. Graciani Diaz43, T. Grammatico11, L.A. Granado Cardoso45, E. Graugés43, E. Graverini46, G. Graziani20, A. Grecu35, R. Greim30, P. Griffith19, L. Grillo59, L. Gruber45, B.R. Gruberg Cazon60, C. Gu3, E. Gushchin39, A. Guth12, Yu. Guz42,45, T. Gys45, T. Hadavizadeh60, C. Hadjivasiliou8, G. Haefeli46, C. Haen45, S.C. Haines52, P.M. Hamilton63, Q. Han6, X. Han15, T.H. Hancock60, S. Hansmann-Menzemer15, N. Harnew60, T. Harrison57, R. Hart30, C. Hasse45, M. Hatch45, J. He4, M. Hecker58, K. Heijhoff30, K. Heinicke13, A. Heister13, A.M. Hennequin45, K. Hennessy57, L. Henry77, M. Heß71, J. Heuel12, A. Hicheur66, R. Hidalgo Charman59, D. Hill60, M. Hilton59, P.H. Hopchev46, J. Hu15, W. Hu6, W. Huang4, Z.C. Huard62, W. Hulsbergen30, T. Humair58, R.J. Hunter53, M. Hushchyn75, D. Hutchcroft57, D. Hynds30, P. Ibis13, M. Idzik33, P. Ilten50, A. Inglessi36, A. Inyakin42, K. Ivshin36, R. Jacobsson45, S. Jakobsen45, J. Jalocha60, E. Jans30, B.K. Jashal77, A. Jawahery63, V. Jevtic13, F. Jiang3, M. John60, D. Johnson45, C.R. Jones52, B. Jost45, N. Jurik60, S. Kandybei48, M. Karacson45, J.M. Kariuki51, S. Karodia56, N. Kazeev75, M. Kecke15, F. Keizer52, M. Kelsey65, M. Kenzie52, T. Ketel31, B. Khanji45, A. Kharisova76, C. 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Lucio Martinez30, Y. Luo3, A. Lupato26, E. Luppi19,85, O. Lupton53, A. Lusiani27, X. Lyu4, S. Maccolini18,83, F. Machefert10, F. Maciuc35, V. Macko46, P. Mackowiak13, S. Maddrell-Mander51, L.R. Madhan Mohan51, O. Maev36,45, A. Maevskiy75, K. Maguire59, D. Maisuzenko36, M.W. Majewski33, S. Malde60, B. Malecki45, A. Malinin73, T. Maltsev41,102, H. Malygina15, G. Manca25,84, G. Mancinelli9, R. Manera Escalero43, D. Manuzzi18,83, D. Marangotto24,95, J. Maratas8,101, J.F. Marchand7, U. Marconi18, S. Mariani20, C. Marin Benito10, M. Marinangeli46, P. Marino46, J. Marks15, P.J. Marshall57, G. Martellotti29, L. Martinazzoli45, M. Martinelli23,45,87, D. Martinez Santos44, F. Martinez Vidal77, A. Massafferri1, M. Materok12, R. Matev45, A. Mathad47, Z. Mathe45, V. Matiunin37, C. Matteuzzi23, K.R. Mattioli78, A. Mauri47, E. Maurice10,80, M. McCann45,58, L. Mcconnell16, A. McNab59, R. McNulty16, J.V. Mead57, B. Meadows62, C. Meaux9, N. Meinert71, D. Melnychuk34, S. Meloni23,87, M. Merk30, A. 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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%.