Identification of beauty and charm quark jets at LHCb

LHCb Collaboration: Aaij, R[ 39 ]; Adeva, B[ 38 ]; Adinolfi, M[ 47 ]; Affolder, A[ 53 ]; Ajaltouni, Z[ 5 ]; Akar, S[ 6 ]; Albrecht, J[ 9 ]; Alessio, F[ 39 ]; Alexander, M[ 52 ]; Ali, S[ 42 ]; Alkhazov, G[ 30 ]; Cartelle, PA[ 54 ]; Alves, AA[ 58 ]; Amato, S[ 2 ]; Amerio, S[ 22 ]; Amhis, Y[ 7 ]; L[ 3 ], An; Anderlini,; 17, L[; ], 75; Anderson, J[ 41 ]; Andreotti,; 16, M[; ], 74; Andrews, JE[ 59 ]; Appleby, RB[ 55 ]; Gutierrez, OA[ 10 ]; Archilli, F[ 39 ]; D'Argent, P[ 11 ]; Artamonov, A[ 36 ]; Artuso, M[ 60 ]; Aslanides, E[ 6 ]; Auriemma,; 25, G[; ], 82; Baalouch, M[ 5 ]; Bachmann, S[ 11 ]; Back, JJ[ 49 ]; Badalov, A[ 37 ]; Baesso, C[ 61 ]; Baldini,; 16, W[; ], 39; Barlow, RJ[ 55 ]; Barschel, C[ 39 ]; Barsuk, S[ 7 ]; Barter, W[ 39 ]; Batozskaya, V[ 28 ]; Battista, V[ 40 ]; Bay, A[ 40 ]; Beaucourt, L[ 4 ]; Beddow, J[ 52 ]; Bedeschi, F[ 23 ]; Bediaga, I[ 1 ]; Bel, LJ[ 42 ]; Belyaev, I[ 31 ]; Ben Haim, E[ 8 ]; Bencivenni, G[ 18 ]; Benson, S[ 39 ]; Benton, J[ 47 ]; Berezhnoy, A[ 32 ]; Bernet, R[ 41 ]; Bertolin, A[ 22 ]; Bettler, MO[ 39 ]; van Beuzekom, M[ 42 ]; Bien, A[ 11 ]; Bifani, S[ 46 ]; Bird, T[ 55 ]; Birnkraut, A[ 9 ]; Bizzeti,; 17, A[; ], 77; Blake, T[ 49 ]; Blanc, F[ 40 ]; Blouw, J[ 10 ]; Blusk, S[ 60 ]; Bocci, V[ 25 ]; Bondar,; 34, A[; ], 35; Bondar,; 30, N[; ], 39; Bonivento, W[ 15 ]; Borghi, S[ 55 ]; Borsato, M[ 7 ]; Bowcock, TJV[ 53 ]; Bowen, E[ 41 ]; Bozzi, C[ 16 ]; Braun, S[ 11 ]; Brett, D[ 55 ]; Britsch, M[ 10 ]; Britton, T[ 60 ]; Brodzicka, J[ 55 ]; Brook, NH[ 47 ]; Bursche, A[ 41 ]; Buytaert, J[ 39 ]; Cadeddu, S[ 15 ]; Calabrese,; 16, R[; ], 74; Calvi,; 20, M[; ], 79; Gomez,; Mc[, 37; ], 84; Campana, P[ 18 ]; Perez, DC[ 39 ]; Capriotti, L[ 55 ]; Carbone,; 14, A[; ], 72; Carboni,; 24, G[; ], 80; Cardinale,; 19, R[; ], 78; Cardini, A[ 15 ]; Carniti, P[ 20 ]; Carson, L[ 51 ]; Akiba,; Kc[, 2; ], 39; Mohr, RC[ 37 ]; Casse, G[ 53 ]; Cassina,; 20, L[; ], 79; Garcia, LC[ 39 ]; Cattaneo, M[ 39 ]; Cauet, C[ 9 ]; Cavallero, G[ 19 ]; Cenci,; 23, R[; ], 88; Charles, M[ 8 ]; Charpentier, P[ 39 ]; Chefdeville, M[ 4 ]; Chen, S[ 55 ]; Cheung, SF[ 56 ]; Chiapolini, N[ 41 ]; Chrzaszcz, M[ 41 ]; Vidal, XC[ 39 ]; Ciezarek, G[ 42 ]; Clarke, PEL[ 51 ]; Clemencic, M[ 39 ]; Cliff, HV[ 48 ]; Closier, J[ 39 ]; Coco, V[ 39 ]; Cogan, J[ 6 ]; Cogneras, E[ 5 ]; Cogoni,; 15, V[; ], 73; Cojocariu, L[ 29 ]; Collazuol, G[ 22 ]; Collins, P[ 39 ]; Comerma Montells, A[ 11 ]; Contu,; 15, A[; ], 39; Cook, A[ 47 ]; Coombes, M[ 47 ]; Coquereau, S[ 8 ]; Corti, G[ 39 ]; Corvo,; 16, M[; ], 74; Counts, I[ 57 ]; Couturier, B[ 39 ]; Cowan, GA[ 51 ]; Craik, DC[ 49 ]; Crocombe, A[ 49 ]; Torres, MC[ 61 ]; Cunliffe, S[ 54 ]; Currie, R[ 54 ]; D'Ambrosio, C[ 39 ]; Dalseno, J[ 47 ]; David, PNY[ 42 ]; Davis, A[ 58 ]; De Bruyn, K[ 42 ]; De Capua, S[ 55 ]; De Cian, M[ 11 ]; De Miranda, JM[ 1 ]; De Paula, L[ 2 ]; De Silva, W[ 58 ]; De Simone, P[ 18 ]; Dean, CT[ 52 ]; Decamp, D[ 4 ]; Deckenhoff, M[ 9 ]; Del Buono, L[ 8 ]; Deleage, N[ 4 ]; Derkach, D[ 56 ]; Deschamps, O[ 5 ]; Dettori, F[ 39 ]; Dey, B[ 41 ]; Di Canto, A[ 39 ]; Di Ruscio, F[ 24 ]; Dijkstra, H[ 39 ]; Donleavy, S[ 53 ]; Dordei, F[ 11 ]; Dorigo, M[ 40 ]; Suarez, AD[ 38 ]; Dossett, D[ 49 ]; Dovbnya, A[ 44 ]; Dreimanis, K[ 53 ]; Dufour, L[ 42 ]; Dujany, G[ 55 ]; Dupertuis, F[ 40 ]; Durante, P[ 39 ]; Dzhelyadin, R[ 36 ]; Dziurda, A[ 26 ]; Dzyuba, A[ 30 ]; Easo,; 39, S[; ], 50; Egede, U[ 54 ]; Egorychev, V[ 31 ]; Eidelman,; 34, S[; ], 35; Eisenhardt, S[ 51 ]; Eitschberger, U[ 9 ]; Ekelhof, R[ 9 ]; Eklund, L[ 52 ]; El Rifai, I[ 5 ]; Elsasser, C[ 41 ]; Ely, S[ 60 ]; Esen, S[ 11 ]; Evans, HM[ 48 ]; Evans, T[ 56 ]; Falabella, A[ 14 ]; Farber, C[ 11 ]; Farinelli, C[ 42 ]; Farley, N[ 46 ]; Farry, S[ 53 ]; Fay, R[ 53 ]; Ferguson, D[ 51 ]; Albor, VF[ 38 ]; Ferrari, F[ 14 ]; Rodrigues, FF[ 1 ]; Ferro Luzzi, M[ 39 ]; Filippov, S[ 33 ]; Fiore,; 16, M[; 39,; ], 74; Fiorini,; 16, M[; ], 74; Firlej, M[ 27 ]; Fitzpatrick, C[ 40 ]; Fiutowski, T[ 27 ]; Fohl, K[ 39 ]; Fol, P[ 54 ]; Fontana, M[ 10 ]; Fontanelli,; 19, F[; ], 78; Forty, R[ 39 ]; Francisco, O[ 2 ]; Frank, M[ 39 ]; Frei, C[ 39 ]; Frosini, M[ 17 ]; J[ 21 ], Fu; Furfaro,; 24, E[; ], 80; Torreira, AG[ 38 ]; Galli,; 14, D[; ], 72; Gallorini,; 22, S[; ], 39; Gambetta,; 19, S[; ], 78; Gandelman, M[ 2 ]; Gandini, P[ 56 ]; Gao, Y[ 3 ]; Pardinas, JG[ 38 ]; Garofoli, J[ 60 ]; Tico, JG[ 48 ]; Garrido, L[ 37 ]; Gascon, D[ 37 ]; Gaspar, C[ 39 ]; Gastaldi, U[ 16 ]; Gauld, R[ 56 ]; Gavardi, L[ 9 ]; Gazzoni, G[ 5 ]; Geraci,; 21, A[; ], 90; Gerick, D[ 11 ]; Gersabeck, E[ 11 ]; Gersabeck, M[ 55 ]; Gershon, T[ 49 ]; Ghez, P[ 4 ]; Gianelle, A[ 22 ]; Giani, S[ 40 ]; Gibson, V[ 48 ]; Girard, OG[ 40 ]; Giubega, L[ 29 ]; Gligorov, VV[ 39 ]; Goebel, C[ 61 ]; Golubkov, D[ 31 ]; Golutvin,; 31, A[; 39,; ], 54; Gomes,; 1, A[; ], 69; Gotti,; 20, C[; ], 79; Gandara, MG[ 5 ]; Diaz, RG[ 37 ]; Cardoso, LAG[ 39 ]; Grauges, E[ 37 ]; Graverini, E[ 41 ]; Graziani, G[ 17 ]; Grecu, A[ 29 ]; Greening, E[ 56 ]; Gregson, S[ 48 ]; Griffith, P[ 46 ]; Grillo, L[ 11 ]; Grunberg, O[ 64 ]; Gui, B[ 60 ]; Gushchin, E[ 33 ]; Guz,; 36, Y[; ], 39; Gys, T[ 39 ]; Hadjivasiliou, C[ 60 ]; Haefeli, G[ 40 ]; Haen, C[ 39 ]; Haines, SC[ 48 ]; Hall, S[ 54 ]; Hamilton, B[ 59 ]; Hampson, T[ 47 ]; Han, X[ 11 ]; Hansmann Menzemer, S[ 11 ]; Harnew, N[ 56 ]; Harnew, ST[ 47 ]; Harrison, J[ 55 ]; J[ 39 ], He; Head, T[ 40 ]; Heijne, V[ 42 ]; Hennessy, K[ 53 ]; Henrard, P[ 5 ]; Henry, L[ 8 ]; Morata, JAH[ 38 ]; van Herwijnen, E[ 39 ]; Hess, M[ 64 ]; Hicheur, A[ 2 ]; Hill, D[ 56 ]; Hoballah, M[ 5 ]; Hombach, C[ 55 ]; Hulsbergen, W[ 42 ]; Humair, T[ 54 ]; Hussain, N[ 56 ]; Hutchcroft, D[ 53 ]; Hynds, D[ 52 ]; Idzik, M[ 27 ]; Ilten, P[ 57 ]; Jacobsson, R[ 39 ]; Jaeger, A[ 11 ]; Jalocha, J[ 56 ]; Jans, E[ 42 ]; Jawahery, A[ 59 ]; Jing, F[ 3 ]; John, M[ 56 ]; Johnson, D[ 39 ]; Jones, CR[ 48 ]; Joram, C[ 39 ]; Jost, B[ 39 ]; Jurik, N[ 60 ]; Kandybei, S[ 44 ]; Kanso, W[ 6 ]; Karacson, M[ 39 ]; Karbach, TM[ 39 ]; Karodia, S[ 52 ]; Kelsey, M[ 60 ]; Kenyon, IR[ 46 ]; Kenzie, M[ 39 ]; Ketel,; 42, T[; ], 43; Khanji,; 20, B[; 39,; ], 79; Khurewathanakul, C[ 40 ]; Klaver, S[ 55 ]; Klimaszewski, K[ 28 ]; Kochebina, O[ 7 ]; Kolpin, M[ 11 ]; Komarov, I[ 40 ]; Koopman,; Rf[, 42; ], 43; Koppenburg,; 39, P[; ], 42; Korolev, M[ 32 ]; Kravchuk, L[ 33 ]; Kreplin, K[ 11 ]; Kreps, M[ 49 ]; Krocker, G[ 11 ]; Krokovny,; 34, P[; ], 35; Kruse, F[ 9 ]; Kucewicz,; 26, W[; ], 83; Kucharczyk, M[ 26 ]; Kudryavtsev,; 34, V[; ], 35; Kuonen, AK[ 40 ]; Kurek, K[ 28 ]; Kvaratskheliya, T[ 31 ]; La Thi, VN[ 40 ]; Lacarrere, D[ 39 ]; Lafferty, G[ 55 ]; Lai, A[ 15 ]; Lambert, D[ 51 ]; Lambert,; Rw[, 42; ], 43; Lanfranchi, G[ 18 ]; Langenbruch, C[ 49 ]; Langhans, B[ 39 ]; Latham, T[ 49 ]; Lazzeroni, C[ 46 ]; Le Gac, R[ 6 ]; van Leerdam, J[ 42 ]; Lees, JP[ 4 ]; Lefevre, R[ 5 ]; Leflat,; 32, A[; ], 39; Lefrancois, J[ 7 ]; Leroy, O[ 6 ]; Lesiak, T[ 26 ]; Leverington, B[ 11 ]; Y[ 7 ], Li; Likhomanenko,; 65, T[; ], 66; Liles, M[ 53 ]; Lindner, R[ 39 ]; Linn, C[ 39 ]; Lionetto, F[ 41 ]; Liu, B[ 15 ]; Liu, X[ 3 ]; Lohn, S[ 39 ]; Longstaff, I[ 52 ]; Lopes, JH[ 2 ]; Lowdon, P[ 41 ]; Lucchesi,; 22, D[; 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doi:10.1088/1748-0221/10/06/P06013

Identification of jets originating from beauty and charm quarks is important for measuring Standard Model processes and for searching for new physics. The performance of algorithms developed to select b- and c-quark jets is measured using data recorded by LHCb from proton-proton collisions at √s = 7 TeV in 2011 and at √s = 8 TeV in 2012. The efficiency for identifying a b(c) jet is about 65%(25%) with a probability for misidentifying a light-parton jet of 0.3% for jets with transverse momentum p(T) > 20GeV and pseudorapidity 2.2 < η < 4.2. The dependence of the performance on the p(T) and η of the jet is also measured.