Measurement of the Z+b-jet cross-section in pp collisions at √s=7 TeV in the forward region

Roel Aaij,Bernardo Adeva,Marco Adinolfi,A. Affolder,Ziad Ajaltouni,Simon Akar,Johannes Albrecht,Federico Alessio,Michael Alexander,Suvayu Ali,Georgy Alkhazov,P. Alvarez Cartelle,Antonio Augusto Alves Jr,Sandra Amato,S. Amerio,Yasmine Amhis,Liupan An,Lucio Anderlini,James J. Anderson,R. Andreassen,Mirco Andreotti,J. E. Andrews,Robert Appleby,O. Aquines Gutierrez,Flavio Archilli,A Artamonov,Marina Artuso,Elie Aslanides,Giulio Auriemma,Marouen Baalouch,Sebastian Bachmann,John Back,Alexey Badalov,Clarissa Baesso,Wander Baldini,Roger Barlow,Colin Barschel,Sergey Barsuk,W. Barter,V. Batozskaya,Vincenzo Battista,A. Bay,Leo Beaucourt,John Beddow,F. Bedeschi,Ignacio Bediaga,S. Belogurov,Konstantin Belous,I. Belyaev,E. Ben Haim,G. Bencivenni,S. Benson,J. Benton,Alexander Berezhnoy,R. Bernet,A. Bertolin,M. O. Bettler,M van Beuzekom,A. Bien,Simone Bifani,T. Bird,A Bizzeti,P. M. Bjørnstad,T. Blake,F. Blanc,J. Blouw,Steven Blusk,Valerio Bocci,Alexander Bondar,N. Bondar,W. Bonivento,S. Borghi,A. Borgia,Martino Borsato,T. J. V. Bowcock,Espen Eie Bowen,C Bozzi,D. Brett,Markward Britsch,T. Britton,Jolanta Brodzicka,N. H. Brook,A. Bursche,J. Buytaert,S Cadeddu,Roberto Calabrese,M. Calvi,M. Calvo Gomez,Pierluigi Campana,D. Campora Perez,Lorenzo Capriotti,A. Carbone,G. Carboni,R. Cardinale,Alessandro Cardini,L. Carson,K. Carvalho Akiba,R. Casanova Mohr,Gianluigi Casse,Lorenzo Cassina,L. Castillo Garcia,Marco Cattaneo,Ch. Cauet,R. Cenci,M. Charles,Ph. Charpentier,M. Chefdeville,Shanzhen Chen,Shu Faye Cheung,N. Chiapolini,M. Chrzaszcz,X. Cid Vidal,G. Ciezarek,Peter Clarke,M. Clemencic,H. V. Cliff,J. Closier,Victor Coco,Joshua Godfrey Cogan,Eric Cogneras,Violetta Cogoni,Lucian Cojocariu,G. Collazuol,Paula Collins,A. Comerma-Montells,A. Contu,A. Cook,M. Coombes,S. Coquereau,G. Corti,Marco Corvo,Ian Thomas Hunt Counts,B Couturier,Glen Cowan,D. C. Craik,Andrew Crocombe,M. Cruz Torres,Samuel Cunliffe,R Currie,C. D’Ambrosio,Jeremy Dalseno,P. David,P. N. Y. David,Adam Davis,K. de Bruyn,S. De Capua,M. De Cian,J.M. de Miranda,L. De Paula,W. De Silva,P De Simone,C. T. Dean,D. Decamp,M. Deckenhoff,L. Del Buono,Nicolas Déléage,D. Derkach,O. Deschamps,Francesco Dettori,Biplab Dey,A. Di Canto,A. Di Domenico,Hans Dijkstra,S. Donleavy,F. Dordei,Marco Dorigo,A. Dosil Suárez,D. Dossett,A. Dovbnya,Karlis Dreimanis,Giulio Dujany,F. Dupertuis,Paolo Durante,R. Dzhelyadin,A. Dziurda,Alexey Dzyuba,S. Easo,U. Egede,Victor Egorychev,Semen Eidelman,Stephan Eisenhardt,Ulrich Eitschberger,R. Ekelhof,Lars Eklund,I. El Rifai,Ch. Elsasser,S. Ely,Sevda Esen,H.M. Evans,Timothy Evans,A. Falabella,C. Färber,C. Farinelli,Nathanael Farley,S. Farry,Robert Fay,Dianne Ferguson,V. Fernandez Albor,F Ferreira Rodrigues,M. Ferro-Luzzi,S. Filippov,Marco Fiore,M. Fiorini,Miroslaw Firlej,C. Fitzpatrick,Tomasz Fiutowski,Philip Fol,M. Fontana,F. Fontanelli,R. Forty,Oscar De Aguiar Francisco,Mariana Frank,C. Frei,M. Frosini,Jinlin Fu,Emiliano Furfaro,A. Gallas Torreira,D. Galli,S. Gallorini,S. Gambetta,M. Gandelman,P. Gandini,Y. S. Gao,J. García Pardiñas,J. Garofoli,J. Garra Tico,Ll. Garrido,David Gascon,Clara Gaspar,Ugo Gastaldi,R. Gauld,Laura Gavardi,Giulio Gazzoni,Angelo Geraci,Evelina Gersabeck,M. Gersabeck,T. J. Gershon,Ph. Ghez,Alessio Gianelle,Sebastiana Gianì,Valerie Gibson,Lavinia-Helena Giubega,Vladimir Gligorov,C. Göbel,D. Golubkov,A. Golutvin,Agostinho Gomes,Claudio Gotti,M. Grabalosa Gándara,R. Graciani Diaz,L. A. Granado Cardoso,Eugeni Graugés,Elena Graverini,G Graziani,A. Grecu,E. Greening,S. Gregson,Peter Griffith,Lucia Grillo,O. Grünberg,B. Gui,E. Gushchin,Yu. Guz,T. Gys,C. Hadjivasiliou,G. Haefeli,C. Haen,S. C. Haines,Samuel Hall,B. Hamilton,T. Hampson,Xiaoxue Han,S. Hansmann-Menzemer,N. Harnew,S. T. Harnew,J. Harrison,J. He,Timothy Head,V. Heijne,K. Hennessy,Pierre Henrard,L. Henry,J. A. Hernando Morata,E. van Herwijnen,M. Heß,Adlène Hicheur,Donal Hill,M. Hoballah,Christoph Hombach,Wouter Hulsbergen,Nazim Hussain,David Hutchcroft,D. Hynds,Marek Idzik,P. Ilten,R. Jacobsson,A. Jaeger,J. Jalocha,Eddy Jans,A. Jawahery,F. F. Jing,M. John,Daniel Johnson,Christopher Jones,Christian Joram,B. Jost,Nathan Jurik,S. Kandybei,Walaa Kanso,M. Karacson,T. M. Karbach,Sarah Karodia,Matthew Kelsey,I. R. Kenyon,Tjeerd Ketel,B. Khanji,Chitsanu Khurewathanakul,Suzanne Klaver,Konrad Klimaszewski,O. Kochebina,Michael Kolpin,Ilya Komarov,R. F. Koopman,Patrick Koppenburg,M. Korolev,L. Kravchuk,K. Kreplin,M. Kreps,G. Krocker,P. Krokovny,F. Kruse,Wojciech Kucewicz,M. Kucharczyk,Vasily Kudryavtsev,Krzysztof Kurek,T. Kvaratskheliya,V. N. La Thi,D. Lacarrere,George Lafferty,A. Lai,D. Lambert,R. W. Lambert,G. Lanfranchi,C. Langenbruch,Benedikt Langhans,Thomas Latham,C. Lazzeroni,R. Le Gac,J. van Leerdam,Jp Lees,R. Lefevre,A. Leflat,J. Lefraņcois,Olivier Leroy,Tadeusz Lesiak,Blake Leverington,Yongjian Li,Tatiana Likhomanenko,M. Liles,R. Lindner,C. Linn,Federica Lionetto,B. Liu,S. Lohn,Iain Longstaff,J. H. Lopes,Peter Lowdon,Donatella Lucchesi,Haofei Luo,A. Lupato,E. Luppi,Oliver Lupton,F. Machefert,I. V. Machikhiliyan,F Maciuc,O. Maev,S. Malde,Alexander Malinin,G. Manca,G. Mancinelli,Alessandro Mapelli,Jan Maratas,Jean François Marchand,U. Marconi,C. Marin Benito,Pietro Marino,R. Märki,J. Marks,G. Martellotti,Maurizio Martinelli,D. Martinez-Santos,F. Martinez Vidal,D. Martins Tostes,Andre Massafferri,Rosen Matev,Z. Mathe,C Matteuzzi,A. Mazurov,Michael McCann,James McCarthy,Andrew McNab,R. McNulty,B. McSkelly,B. T. Meadows,Frank Meier,M. Meissner,M.H.M. Merk,D. A. Milanes,M.-N. Minard,N. Moggi,J. Molina Rodriguez,S. Monteil,M. Morandin,P. Morawski,Alessandro Mordà,M. J. Morello,Jakub Moron,A. B. Morris,Raymond Mountain,F. Muheim,K. Müller,M Mussini,B. Muster,P. Naik,Tatsuya Nakada,R. Nandakumar,I. Nasteva,Matthew Needham,N. Neri,S. Neubert,Niko Neufeld,Max Neuner,A. D. Nguyen,T. D. Nguyen,C. Nguyen-Mau,M. Nicol,V. Niess,Ramon Niet,N. Nikitin,Thomas Nikodem,A. Novoselov,D. P. O’Hanlon,A. Oblakowska-Mucha,V. Obraztsov,S. Ogilvy,O. Okhrimenko,R. Oldeman,C. J. G. Onderwater,M Orlandea,B. Osorio Rodrigues,J. M. Otalora Goicochea,Adam Otto,P. Owen,A. Oyanguren,B. K. Pal,Antimo Palano,F. Palombo,M. Palutan,J. Panman,A. Papanestis,M. Pappagallo,Luciano Pappalardo,C. Parkes,C. J. Parkinson,G. Passaleva,Girish Patel,M. Patel,C. Patrignani,Alex Pearce,A. Pellegrino,G. Penso,M. Pepe-Altarelli,S. Perazzini,Pascal Perret,Luca Pescatore,E. Pesen,K. Petridis,A Petrolini,E. Picatoste Olloqui,B. Pietrzyk,T. Pilař,D. Pinci,Alessandro Pistone,S. Playfer,M. Plo Casasus,Francesco Polci,A. Poluektov,Ivan Polyakov,E. Polycarpo,A. V. Popov,Dmitry Popov,B. Popovici,Cédric Potterat,Eugenia Price,J. D. Price,J. Prisciandaro,Adrian Pritchard,Claire Prouve,Valery Pugatch,A. Puig Navarro,G. Punzi,Wenbin Qian,Bartolomiej Rachwal,J. H. Rademacker,B. Rakotomiaramanana,M. Rama,M. S. Rangel,I. Raniuk,N. Rauschmayr,G. Raven,F. Redi,Stefanie Reichert,M. M. Reid,A.C. dos Reis,S. Ricciardi,Sophie Richards,Mariana Rihl,K. Rinnert,V. Rives Molina,P. Robbe,Ana Bárbara Rodrigues,E. Rodrigues,P. Rodriguez Perez,S. Roiser,V. Romanovsky,A. Romero Vidal,M. Rotondo,J. Rouvinet,T. Ruf,H. Ruiz,P. Ruiz Valls,J. J. Saborido Silva,N. Sagidova,P. Sail,B. Saitta,V. Salustino Guimaraes,C. Sanchez Mayordomo,B. Sanmartin Sedes,R. Santacesaria,C. Santamarina Rios,E. Santovetti,A. Sarti,Celestina Satriano,A. Satta,D. M. Saunders,D. Savrina,Manuel Schiller,Heinrich Schindler,M. Schlupp,Michael Schmelling,B. Schmidt,O. Schneider,A. Schopper,M. H. Schune,R. Schwemmer,B. Sciascia,A. Sciubba,A. Semennikov,I. Sepp,N. Serra,J. Serrano,Lorenzo Sestini,P. Seyfert,M. Shapkin,I. Shapoval,Y. Shcheglov,Tara Shears,L. Shekhtman,V. Shevchenko,Alexander Shires,R. Silva Coutinho,G. Simi,Marek Sirendi,Nicola Skidmore,I.O. Skillicorn,Tomasz Skwarnicki,N. A. Smith,E. Smith,Jackson Smith,M. J. Smith,H.L. Snoek,M. D. Sokoloff,F. J. P. Soler,F. Soomro,D. Souza,B. Souza De Paula,B. Spaan,P. Spradlin,Srikanth Sridharan,F. Stagni,Marian Stahl,S. Stahl,O. Steinkamp,Oleg Stenyakin,F. Sterpka,Scott Stevenson,S. Stoica,Sheldon Stone,B. Storaci,S. Stracka,M. Straticiuc,U Straumann,R. Stroili,Luyan Sun,William Sutcliffe,Krzysztof Swientek,S. Swientek,Vasileios Syropoulos,M. Szczekowski,P. Szczypka,Tomasz Szumlak,S. T’Jampens,M. Teklishyn,Giulia Tellarini,F. Teubert,C. Thomas,E. Thomas,J. van Tilburg,V. Tisserand,M. Tobin,Jacob Todd,Siim Tolk,Luca Tomassetti,D. Tonelli,S. Topp-Joergensen,N. Torr,E. Tournefier,S. Tourneur,M. T. Tran,Marco Tresch,Ana Trisovic,Andrei Tsaregorodtsev,Panagiotis Tsopelas,N Tuning,M. Ubeda Garcia,A. Ukleja,Andrey Ustyuzhanin,U. Uwer,Claudia Vacca,V. Vagnoni,G Valenti,Alexis Vallier,R Vázquez Gómez,P. Vazquez Regueiro,C. Vázquez Sierra,S. Vecchi,J. J. Velthuis,M. Veltri,Giovanni Veneziano,Mika Vesterinen,J. V. Viana Barbosa,B. Viaud,D. Vieira,M. Vieites Diaz,X. Vilasis-Cardona,Achim Vollhardt,D. Volyanskyy,D. Voong,An. Vorobyev,Vitaly Vorobyev,Christian Voß,J. A. De Vries,R. Waldi,Charlotte Wallace,Ronan Wallace,J.J. Walsh,S. Wandernoth,J. Wang,D.R. Ward,N. K. Watson,D. Websdale,Mark Whitehead,D. Wiedner,G R Wilkinson,Michael Wilkinson,M. P. Williams,Mark Williams,Hans Wilschut,Ff Wilson,Jack Wimberley,J. Wishahi,Wojciech Wislicki,M. Witek,G. Wormser,S.A. Wotton,S. Wright,K. Wyllie,Y. Xie,Z. Xing,Zhirui Xu,Zongxian Yang,Xuhao Yuan,Oleg Yushchenko,M. Zangoli,Mikhail Zavertyaev,Liming Zhang,W. C. Zhang,Yu Zhang,A. Zhelezov,Anatoly Zhokhov,L. Zhong

Measurement of the Z+b-jet cross-section in pp collisions at √s=7 TeV in the forward region

2015

The associated production of a Z boson or an off-shell photon γ ∗ with a bottom quark in the forward region is studied using proton-proton collisions at a centre-of-mass energy of 7 TeV. The Z bosons are reconstructed in the Z/γ∗ → µ +µ − final state from muons with a transverse momentum larger than 20 GeV, while two transverse momentum thresholds are considered for jets (10 GeV and 20 GeV). Both muons and jets are reconstructed in the pseudorapidity range 2.0 < η < 4.5. The results are based on data corresponding to 1.0 fb−1 recorded in 2011 with the LHCb detector. The measurement of the Z+b-jet cross-section is normalized to the Z+jet cross-section. The measured cross-sections are σ(Z/γ∗ (µ +µ −) + b-jet) = 295 ± 60 (stat) ± 51 (syst) ± 10 (lumi) fb (0.1) for pT(jet) > 10 GeV, and σ(Z/γ∗ (µ +µ −) + b-jet) = 128 ± 36 (stat) ± 22 (syst) ± 5 (lumi) fb (0.2) for pT(jet) > 20 GeV.

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