LHCb CollaborationAaij, R.Adeva, B.Adinolfi, M.Affolder, A.Ajaltouni, Z.Akar, S.Albrecht, J.Alessio, F.Alexander, M.Ali, S.Alkhazov, G.Alvarez Cartelle, P.Amato, S.Amerio, S.Amhis, Y.An, L.Anderlini, L.Anderson, J.Andreassen, R.Andreotti, M.Andrews, J. E.Appleby, R. B.Gutierrez, O. AquinesArchilli, F.Artamonov, A.Artuso, M.Aslanides, E.Auriemma, G.Baalouch, M.Bachmann, S.Back, J. J.Badalov, A.Baesso, C.Baldini, W.Barlow, R. J.Barschel, C.Barsuk, S.Barter, W.Batozskaya, V.Battista, V.Bay, A.Beaucourt, L.Beddow, J.Bedeschi, F.Bediaga, I.Belogurov, S.Belous, K.Belyaev, I.Ben-Haim, E.Bencivenni, G.Benson, S.Benton, J.Berezhnoy, A.Bernet, R.Bettler, M. -O.Van Beuzekom, M.Bien, A.Bifani, S.Bird, T.Bizzeti, A.Bjornstad, P. M.Blake, T.Blanc, F.Blouw, J.Blusk, S.Bocci, V.Bondar, A.Bondar, N.Bonivento, W.Borghi, S.Borgia, A.Borsato, M.Bowcock, T. J. V.Bowen, E.Bozzi, C.Brambach, T.Bressieux, J.Brett, D.Britsch, M.Britton, T.Brodzicka, J.Brook, N. H.Brown, H.Bursche, A.Buytaert, J.Cadeddu, S.Calabrese, R.Calvi, M.Calvo Gomez, M.Campana, P.Perez, D. CamporaCarbone, A.Carboni, G.Cardinale, R.Cardini, A.Carson, L.Carvalho Akiba, K.Casse, G.Cassina, L.Garcia, L. CastilloCattaneo, M.Cauet, Ch.Cenci, R.Charles, M.Charpentier, Ph.Chefdeville, M.Chen, S.Cheung, S. -F.Chiapolini, N.Chrzaszcz, M.Ciba, K.Vidal, X. CidCiezarek, G.Clarke, P. E. L.Clemencic, M.Cliff, H. V.Closier, J.Coco, V.Cogan, J.Cogneras, E.Cojocariu, L.Collazuol, G.Collins, P.Comerma-Montells, A.Contu, A.Cook, A.Coombes, M.Coquereau, S.Corti, G.Corvo, M.Counts, I.Couturier, B.Cowan, G. A.Craik, D. C.Cruz Torres, M.Cunliffe, S.Currie, R.D'Ambrosio, C.Dalseno, J.David, P.David, P. N. Y.Davis, A.De Bruyn, K.De Capua, S.De Cian, M.De Miranda, J. M.De Paula, L.De Silva, W.De Simone, P.Dean, C. -T.Decamp, D.Deckenhoff, M.Del Buono, L.Deleage, N.Derkach, D.Deschamps, O.Dettori, F.Di Canto, A.Dijkstra, H.Donleavy, S.Dordei, F.Dorigo, M.Dosil Suarez, A.Dossett, D.Dovbnya, A.Dreimanis, K.Dujany, G.Dupertuis, F.Durante, P.Dzhelyadin, R.Dziurda, A.Dzyuba, A.Easo, S.Egede, U.Egorychev, V.Eidelman, S.Eisenhardt, S.Eitschberger, U.Ekelhof, R.Eklund, L.El Rifai, I.Elsasser, Ch.Ely, S.Esen, S.Evans, H. -M.Evans, T.Falabella, A.Faerber, C.Farinelli, C.Farley, N.Farry, S.Fay, R. F.Ferguson, D.Fernandez Albor, V.Ferreira Rodrigues, F.Ferro-Luzzi, M.Filippov, S.Fiore, M.Fiorini, M.Firlej, M.Fitzpatrick, C.Fiutowski, T.Fol, P.Fontana, M.Fontanelli, F.Forty, R.Francisco, O.Frank, M.Frei, C.Frosini, M.Fu, J.Furfaro, E.Gallas Torreira, A.Galli, D.Gallorini, S.Gambetta, S.Gandelman, M.Gandini, P.Gao, Y.Garcia Pardinas, J.Garofoli, J.Tico, J. 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R.Ketel, T.Khanji, B.Khurewathanakul, C.Klaver, S.Klimaszewski, K.Kochebina, O.Kolpin, M.Komarov, I.Koopman, R. F.Koppenburg, P.Korolev, M.Kozlinskiy, A.Kravchuk, L.Kreplin, K.Kreps, M.Krocker, G.Krokovny, P.Kruse, F.Kucewicz, W.Kucharczyk, M.Kudryavtsev, V.Kurek, K.Kvaratskheliya, T.La Thi, V. N.Lacarrere, D.Lafferty, G.Lai, A.Lambert, D.Lambert, R. W.Lanfranchi, G.Langenbruch, C.Langhans, B.Latham, T.Lazzeroni, C.Le Gac, R.Van Leerdam, J.Lees, J. -P.Lefevre, R.Leflat, A.Lefrancois, J.Leo, S.Leroy, O.Lesiak, T.Leverington, B.Li, Y.Likhomanenko, T.Liles, M.Lindner, R.Linn, C.Lionetto, F.Liu, B.Lohn, S.Longstaff, I.Lopes, J. H.Lopez-March, N.Lowdon, P.Lu, H.Lucchesi, D.Luo, H.Lupato, A.Luppi, E.Lupton, O.Machefert, F.Machikhiliyan, I. V.Maciuc, F.Maev, O.Malde, S.Malinin, A.Manca, G.Mancinelli, G.Mapelli, A.Maratas, J.Marchand, J. F.Marconi, U.Marin Benito, C.Marino, P.Maerki, R.Marks, J.Martellotti, G.Martens, A.Sanchez, A. MartinMartinelli, M.Santos, D. 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C.Zhang, Y.Zhelezov, A.Zhokhov, A.Zhong, L.Zvyagin, A.2015-02-202015-02-202015-02-20201410.1088/1748-0221/9/12/P12005https://infoscience.epfl.ch/handle/20.500.14299/111520WOS:000345859200021Measuring cross-sections at the LHC requires the luminosity to be determined accurately at each centre-of-mass energy root s. In this paper results are reported from the luminosity calibrations carried out at the LHC interaction point 8 with the LHCb detector for root s = 2.76, 7 and 8TeV (proton-proton collisions) and for root s(NN) = 5TeV (proton-lead collisions). Both the "van der Meer scan" and "beam-gas imaging" luminosity calibration methods were employed. It is observed that the beam density profile cannot always be described by a function that is factorizable in the two transverse coordinates. The introduction of a two-dimensional description of the beams improves significantly the consistency of the results. For proton-proton interactions at root s = 8TeV a relative precision of the luminosity calibration of 1.47% is obtained using van der Meer scans and 1.43% using beam-gas imaging, resulting in a combined precision of 1.12%. Applying the calibration to the full data set determines the luminosity with a precision of 1.16%. This represents the most precise luminosity measurement achieved so far at a bunched-beam hadron collider.Pattern recognitioncluster findingcalibration and fitting methodsInstrumentation for particle accelerators and storage rings - high energy (linear acceleratorssynchrotrons)text::journal::journal article::research article