Measurement of Beauty Photoproduction Near Threshold Using Di-Electron Events with the H1 Detector at HERA

The H Collaboration,F. D. Aaron,C. Alexa,V. Andreev,S. Backovic,A. Baghdasaryan, S. Baghdasaryan,E. Barrelet,W. Bartel, K. Begzsuren,A. Belousov,P. Belov,J. C. Bizot,V. Boudry,I. Bozovic-Jelisavcic,J. Bracinik,G. Brandt,M. Brinkmann,V. Brisson,D. Britzger,D. Bruncko, A. Bunyatyan,A. Bylinkin,L. Bystritskaya,A. J. Campbell,K. B. Cantun Avila,F. Ceccopieri,K. Cerny,V. Cerny,V. Chekelian,J. G. Contreras,J. A. Coughlan,J. Cvach,J. B. Dainton,K. Daum,B. Delcourt,J. Delvax,E. A. De Wolf,C. Diaconu,M. Dobre,V. Dodonov,A. Dossanov,A. Dubak, G. Eckerlin,S. Egli,A. Eliseev,E. Elsen,L. Favart,A. Fedotov,R. Felst,J. Feltesse, J. Ferencei,D.-J. Fischer,M. Fleischer,A. Fomenko,E. Gabathuler,J. Gayler,S. Ghazaryan,A. Glazov,L. Goerlich,N. Gogitidze,M. Gouzevitch,C. Grab, A. Grebenyuk,T. Greenshaw,G. Grindhammer,S. Habib,D. Haidt, R. C. W. Henderson,E. Hennekemper,H. Henschel,M. Herbst,G. Herrera,M. Hildebrandt,K. H. Hiller,D. Hoffmann,R. Horisberger,T. Hreus,F. Huber,M. Jacquet,X. Janssen,L. Jönsson, A. W. Jung,H. Jung,M. Kapichine,I. R. Kenyon,C. Kiesling,M. Klein, C. Kleinwort,R. Kogler,P. Kostka,M. Krämer,J. Kretzschmar,K. Krüger,M. P. J. Landon,W. Lange,G. Laštovička-Medin,P. Laycock,A. Lebedev,V. Lendermann,S. Levonian,K. Lipka,B. List,J. List, B. Lobodzinski,R. Lopez-Fernandez,V. Lubimov,E. Malinovski,H.-U. Martyn,S. J. Maxfield,A. Mehta,A. B. Meyer,H. Meyer,J. Meyer,S. Mikocki,I. Milcewicz-Mika,F. Moreau,A. Morozov,J. V. Morris,K. Müller,Th. Naumann,P. R. Newman,C. Niebuhr,D. Nikitin,G. Nowak,K. Nowak,B. Olivier,J. E. Olsson,D. Ozerov,P. Pahl,V. Palichik,M. Pandurovic,C. Pascaud,G. D. Patel,E. Perez,A. Petrukhin,I. Picuric, H. Pirumov, D. Pitzl,R. Plačakytė,B. Pokorny,R. Polifka,B. Povh,V. Radescu,N. Raicevic,T. Ravdandorj,P. Reimer,E. Rizvi,P. Robmann,R. Roosen,A. Rostovtsev,M. Rotaru,J. E. Ruiz Tabasco,S. Rusakov,D. Šálek,D. P. C. Sankey,M. Sauter,E. Sauvan,S. Schmitt,L. Schoeffel,A. Schöning,H.-C. Schultz-Coulon,F. Sefkow,L. N. Shtarkov,S. Shushkevich,T. Sloan,Y. Soloviev,P. Sopicki,D. South,V. Spaskov,A. Specka,Z. Staykova, M. Steder,B. Stella,G. Stoicea,U. Straumann,T. Sykora,P. D. Thompson,T. H. Tran,D. Traynor,P. Truöl,I. Tsakov,B. Tseepeldorj,J. Turnau,A. Valkárová,C. Vallée,P. Van Mechelen,Y. Vazdik, D. Wegener,E. Wünsch,J. Žáček,J. Zálešák,Z. Zhang, A. Zhokin,R. Žlebčík,H. Zohrabyan,F. Zomer

European physical journal C, Particles and fields（2012）

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摘要

The cross section for \(ep \rightarrow e\, b\bar{b} X\) in photoproduction is measured with the H1 detector at the ep-collider HERA. The decay channel \(b\bar{b} \rightarrow ee X'\) is selected by identifying the semi-electronic decays of the b-quarks. The total production cross section is measured in the kinematic range given by the photon virtuality Q 2≤1 GeV2, the inelasticity 0.05≤y≤0.65 and the pseudorapidity of the b-quarks \(|\eta(b)|, |\eta(\bar{b})|\leq2\). The differential production cross section is measured as a function of the average transverse momentum of the beauty quarks 〈P T (b)〉 down to the threshold. The results are compared to next-to-leading-order QCD predictions.

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关键词

Transverse Momentum,Parton Shower,Trigger Level,Electron Candidate,Average Transverse Momentum

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