Measurement of the b-Quark Production Cross Section in 7 and 13TeV pp Collisions.

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Müller,D Pinci,J Benton,T Ketel,A Falabella,S Akar,R Santacesaria,K De Bruyn,A Birnkraut,F Ferrari,L Silva De Oliveira,A Bertolin,M Kreps,J Blouw,M De Serio,C Langenbruch,A Novoselov,F Palombo,P Collins,V Rives Molina,T Blake,A Cardini,P Griffith,S Playfer,N Jurik,A Piucci,T Nikodem,W Qian,T Britton,I Raniuk,P Marino,E Price,B Liu,C Göbel,D Hutchcroft,T Shears,U Egede,C Lazzeroni,K Trabelsi,D Hill,V Vagnoni,T Szumlak,E Thomas,A Pearce,C Vázquez Sierra,K Wyllie,Y Amhis,R Waldi,G Corti,A Massafferri,E Picatoste Olloqui,Y Gao,J Beddow,T Maltsev,N Bondar,S Farry,E Gushchin,S Nieswand,M Morandin,N Neri,D Loh,G Mancinelli,J Wicht,C Wallace,U Straumann,S De Capua,K Rinnert,P Ruiz Valls,S T’Jampens,L Sestini,A Borgheresi,M Pappagallo,L Beaucourt,C Khurewathanakul,B Adeva,I Komarov,V Romanovskiy,A Badalov,A Lupato,M Petruzzo,D Tonelli,R Silva Coutinho,S Eidelman,R Graciani Diaz,B Batsukh,E Bowen,M Pikies,V Volkov,B Couturier,M Schmelling,D Martins Tostes,G Valenti,M Neuner,C Gotti,L Henry,W Barter,A Pastore,G Graziani,I Shapoval,M Kecke,A Dovbnya,P Ilten,A Bondar,C Bozzi,M Alexander,S Stracka,B Jost,K Maguire,N Neufeld,U Eitschberger,M Grabalosa Gándara,A Gomes,F Lionetto,R Cardinale,R Calabrese,M Smith,M Palutan,A Vorobyev,E Van Herwijnen,T Ruf,A Popov,U Uwer,I Belyaev,M Calvo Gomez,C Haen,A Trisovic,I Babuschkin,C Voß,D Ferguson,M Patel,M Borisyak,M Kelsey,R Quagliani,G Dujany,S Baker,F Toriello,L Pescatore,S Chen,E Lemos Cid,F Blanc,T Williams,R Matev,F Dordei,S Stone,S Bachmann,Z Ajaltouni,J Arnau Romeu,L Carson,W Kucewicz,E Buchanan,Ch Cauet,A Ustyuzhanin,L Grillo,S Benson,X Liu,A Kosmyntseva,L Anderlini,S Monteil,K Müller,T Skwarnicki,S Stevenson,M Wilkinson,S Perazzini,S Ali,A Sciubba,M Frank,L An,C Barschel,E Furfaro,C Joram,Y Shcheglov,M Fiorini,G Tellarini,A Jaeger,P Durante,R Jacobsson,T Lesiak,E Graugés,V Batozskaya,R Nandakumar,S Easo,A Dosil Suárez,E Gersabeck,S Bifani,V Syropoulos,A Pellegrino,M Van Veghel,C Satriano,A Otto,I Longstaff,M Chefdeville,G 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doi:10.1103/physrevlett.118.052002

Abstract

Measurements of the cross section for producing b quarks in the reaction pp→bb[over ¯]X are reported in 7 and 13TeV collisions at the LHC as a function of the pseudorapidity η in the range 2<η<5 covered by the acceptance of the LHCb experiment. The measurements are done using semileptonic decays of b-flavored hadrons decaying into a ground-state charmed hadron in association with a muon. The cross sections in the covered η range are 72.0±0.3±6.8 and 154.3±1.5±14.3 μb for 7 and 13TeV. The ratio is 2.14±0.02±0.13, where the quoted uncertainties are statistical and systematic, respectively. The agreement with theoretical expectation is good at 7TeV, but differs somewhat at 13TeV. The measured ratio of cross sections is larger at lower η than the model prediction.

Highlights

Production of b quarks in high energy pp collisions at the LHC provides a sensitive test of models based on quantum chromodynamics [1]
We present here measurements of production cross sections for the average of b-flavored and b-flavored hadrons, denoted pp → HbX, where X indicates additional particles, in pp collisions recorded by LHCb at both 7 and 13 TeV center-of-mass energies, and their ratio
Previous determinations were made at the Tevatron collider in pp collisions near 2 TeV center-of-mass energy [6]

Summary

Introduction

Production of b quarks in high energy pp collisions at the LHC provides a sensitive test of models based on quantum chromodynamics [1]. We present here measurements of production cross sections for the average of b-flavored and b-flavored hadrons, denoted pp → HbX, where X indicates additional particles, in pp collisions recorded by LHCb at both 7 and 13 TeV center-of-mass energies, and their ratio. To measure these cross sections we determine the signal yields of b decays into a charm hadron plus a muon for a given integrated luminosity L and correct for various efficiencies described below.

Results

Conclusion