Study of J/ψ Production in Jets.

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Capua,G Cavallero,T Klimkovich,H Viemann,O Deschamps,J Closier,M Whitehead,B Viaud,A Beiter,S Braun,A Pellegrino,J Wishahi,F Baryshnikov,Y Gao,G Auriemma,M Vitti,R Cardinale,C Voß,M J Tilley,O Stenyakin,U Straumann,A Gallas Torreira,A Pritchard,R Currie,W Parker,F Blanc,R Ekelhof,I Bediaga,T Evans,T Fiutowski,P Ilten,P Collins,G A Cowan,M Cattaneo,A Otto,T Latham,A Popov,I Babuschkin,E Michielin,A Nandi,S Stevenson,E Cogneras,S Ogilvy,T Poikela,B Jost,L Capriotti,C Gaspar,L Gavardi,M Petruzzo,T Nakada,A Tsaregorodtsev,K Hennessy,R Mountain,K Belous,S Eisenhardt,Y Yao,G J Pomery,N Sagidova,B R Gruberg Cazon,O Schneider,R Dzhelyadin,N Tuning,F Fontanelli,D Pinci,B Couturier,A Bay,M Palutan,U Uwer,V Chobanova,A Bursche,A Baranov,S Amato,O Okhrimenko,M John,A Nogay,D Martins Tostes,T Schmelzer,D Websdale,M S Rangel,H Stevens,G Wilkinson,T Tekampe,D C Forshaw,M Fontana,L Shekhtman,S Malde,C Betancourt,D Popov,P Stefko,E Bowen,C Barschel,G Passaleva,V Battista,F J P Soler,J He,N Neri,S C Haines,J Müller,B Leverington,P Ruiz Valls,S Zucchelli,P Naik,A Gomes,Z Xu,A Badalov,G Chatzikonstantinidis,M Pikies,R Quagliani,B Meadows,W Hulsbergen,T Skwarnicki,R Jacobsson,G Bencivenni,Y Shcheglov,M Cruz Torres,L Grillo,R Santacesaria,E Gushchin,W Barter,M Sirendi,M Schiller,W Baldini,E Price,M Adinolfi,M Veltri,V Müller,J Maratas,C T Dean,A Schopper,P Robbe,G Veneziano,B Hamilton,S Kandybei,L Beaucourt,J Blouw,M Baalouch,S Hansmann-Menzemer,M Firlej,F Machefert,R Wallace,S Esen,E Furfaro,A Kosmyntseva,E Tournefier,X Cid Vidal,G Alkhazov,A Semennikov,W Qian,S Tolk,R Mcnulty,C Frei,P Alvarez Cartelle,A Mogini,M Kelsey,J A De Vries,L Cojocariu,W Funk,P Billoir,C R Jones,B Saitta,X Zhu,C Baesso,C Khurewathanakul,F Maciuc,G Manca,P D’Argent,M Traill,B Schmidt,D Ferguson,M Corvo,V Bocci,A Di Canto,S Blusk,S Coquereau,K Müller,G Punzi,A Camboni,I Raniuk,M Clemencic,D Müller,M Merk,A Sciubba,M Mulder,S Stracka,M Ebert,C Haen,V Syropoulos,M Zavertyaev,M Pappagallo,A Mcnab,M Rama,M 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Ronayne,L Anderlini,B Pietrzyk,V Kudryavtsev,S Bifani,P Pais ,M P Williams,D S Mitzel,S Akar,M Kecke,L Massacrier ,M Vieites Diaz,A Davis,R Graciani Diaz,A Fernández Prieto ,I Komarov,P Vázquez Regueiro ,K Rinnert,S Richards,L Dufour,K A Zarebski,L M Garcia Martin,P Durante,M Mccann,S Koliiev,S Ponce,M Meissner,S Benson,M Schellenberg,J Fu,Yiming Li ,M Pepe Altarelli,S Valat,M Alexander,T Blake,D Sanchez Gonzalo,L Garrido,K Kreplin,Yanxi Zhang ,I G Bordyuzhin ,A Mauri,P Rodríguez Pérez ,R Lefèvre,Joao Vitor Viana Barbosa ,M Kozeiha,C Vacca,P Owen,C D’Ambrosio,A B Rodrigues,Z Yang,Philippe Charpentier ,D M Saunders,A Hicheur,N Farley,G Lanfranchi,J A Rodriguez Lopez,F Redi,E Gersabeck,D Johnson,A Sarti,J Van Leerdam,X R Lyu ,A Contu,S Stoica,Е Говоркова ,V Placinta,M Tobin,E Lemos Cid,G Penso,A Obłąkowska-Mucha ,N Harnew,J Walsh,J Moroń ,S Nieswand,D Galli,S Perazzini,C Gotti,V Batozskaya,K Świentek ,N Belloli,P De Simone,S T Harnew,U Eitschberger,A Berezhnoy,Yury Guz ,G Coombs,C 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doi:10.1103/physrevlett.118.192001

Abstract

The production of J/ψ mesons in jets is studied in the forward region of proton-proton collisions using data collected with the LHCb detector at a center-of-mass energy of 13TeV. The fraction of the jet transverse momentum carried by the J/ψ meson, z(J/ψ)≡p_{T}(J/ψ)/p_{T}(jet), is measured using jets with p_{T}(jet)>20 GeV in the pseudorapidity range 2.5<η(jet)<4.0. The observed z(J/ψ) distribution for J/ψ mesons produced in b-hadron decays is consistent with expectations. However, the results for prompt J/ψ production do not agree with predictions based on fixed-order nonrelativistic QCD. This is the first measurement of the p_{T} fraction carried by prompt J/ψ mesons in jets at any experiment.

Highlights

The unfolded 1⁄2zðJ=ψÞ; pTðjetÞ distributions are integrated for pTðjetÞ > 20 GeV to produce the measured zðJ=ψÞ spectra
Wrong primary vertex (PV) ~t [ps]LHCb s = 13 TeV 20 < p < 30 GeV mass [45], and pLðJ=ψÞ is the component of the J=ψ momentum longitudinal to the beam axis
The yield of J=ψ → μþμ− decays reconstructed in each 1⁄2zðJ=ψÞ; pTðjetÞ bin, which includes J=ψ mesons produced promptly and in b-hadron decays, is determined from an unbinned maximum likelihood fit to the corresponding dimuon invariant-mass distribution

Summary

Introduction

The unfolded 1⁄2zðJ=ψÞ; pTðjetÞ distributions are integrated for pTðjetÞ > 20 GeV to produce the measured zðJ=ψÞ spectra. The yield of J=ψ → μþμ− decays reconstructed in each 1⁄2zðJ=ψÞ; pTðjetÞ bin, which includes J=ψ mesons produced promptly and in b-hadron decays, is determined from an unbinned maximum likelihood fit to the corresponding dimuon invariant-mass distribution.

Results

Conclusion