A study of the b-quark fragmentation function with the DELPHI detector at LEP I and an averaged distribution obtained at the Z Pole

J. Abdallah,P. Abreu,W. Adam, P. Adzic, T. Albrecht, R. Alemany-Fernandez,T. Allmendinger,P. P. Allport,U. Amaldi,N. Amapane,S. Amato, E. Anashkin, A. Andreazza, S. Andringa,N. Anjos,P. Antilogus,W-D. Apel, Y. Arnoud, S. Ask, B. Asman, J. E. Augustin, A. Augustinus, P. Baillon,A. Ballestrero, P. Bambade,R. Barbier,D. Bardin,G. J. Barker, A. Baroncelli,M. Battaglia, M. Baubillier, K-H. Becks, M. Begalli, A. Behrmann, E. Ben-Haim,N. Benekos,A. Benvenuti, C. Berat,M. Berggren,D. Bertrand,M. Besancon,N. Besson,D. Bloch,M. Blom,M. Bluj,M. Bonesini, M. Boonekamp,P. S. L. Booth, G. Borisov,O. Botner, B. Bouquet,T. J. V. Bowcock, I. Boyko, M. Bracko, R. Brenner,E. Brodet,P. Bruckman,J. M. Brunet,B. Buschbeck, P. Buschmann, M. Calvi,T. Camporesi, V. Canale,F. Carena,N. Castro, F. Cavallo, M. Chapkin,Ph. Charpentier,P. Checchia, R. Chierici,P. Chliapnikov,J. Chudoba, S. U. Chung,K. Cieslik,P. Collins,R. Contri,G. Cosme,F. Cossutti,M. J. Costa, D. Crennell,J. Cuevas, J. D’Hondt,T. da Silva,W. Da Silva,G. Della Ricca,A. De Angelis,W. De Boer,C. De Clercq,B. De Lotto,N. De Maria,A. De Min,L. de Paula,L. Di Ciaccio,A. Di Simone, K. Doroba, J. Drees,G. Eigen, T. Ekelof,M. Ellert,M. Elsing,M. C. Espirito Santo, G. Fanourakis,D. Fassouliotis, M. Feindt,J. Fernandez, A. Ferrer, F. Ferro, U. Flagmeyer, H. Foeth, E. Fokitis, F. Fulda-Quenzer,J. Fuster,M. Gandelman,C. Garcia,Ph. Gavillet,E. Gazis, R. Gokieli, B. Golob, G. Gomez-Ceballos,P. Goncalves,E. Graziani,G. Grosdidier,K. Grzelak, J. Guy,C. Haag, A. Hallgren,K. Hamacher,K. Hamilton,S. Haug, F. Hauler, V. Hedberg,M. Hennecke,J. Hoffman,S-O. Holmgren,P. J. Holt, M. A. Houlden, J. N. Jackson, G. Jarlskog, P. Jarry,D. Jeans,E. K. Johansson,P. Jonsson, C. Joram, L. Jungermann, F. Kapusta,S. Katsanevas,E. Katsoufis, G. Kernel,B. P. Kersevan,U. Kerzel, B. T. King,N. J. Kjaer, P. Kluit,P. Kokkinias,C. Kourkoumelis,O. Kouznetsov, Z. Krumstein, M. Kucharczyk,J. Lamsa,G. Leder, F. Ledroit,L. Leinonen,R. Leitner, J. Lemonne,V. Lepeltier,T. Lesiak, W. Liebig, D. Liko,A. Lipniacka,J. H. Lopes,J. M. Lopez,D. Loukas,P. Lutz, L. Lyons,J. MacNaughton,A. Malek,S. Maltezos,F. Mandl,J. Marco,R. Marco, B. Marechal, M. Margoni,J-C. Marin, C. Mariotti, A. Markou, C. Martinez-Rivero, J. Masik,N. Mastroyiannopoulos,F. Matorras,C. Matteuzzi, F. Mazzucato, M. Mazzucato,R. Mc Nulty, C. Meroni, E. Migliore,W. Mitaroff, U. Mjoernmark, T. Moa, M. Moch,K. Moenig, R. Monge,J. Montenegro,D. Moraes,S. Moreno, P. Morettini,U. Mueller, K. Muenich, M. Mulders,L. Mundim,W. Murray,B. Muryn, G. Myatt, T. Myklebust, M. Nassiakou,F. Navarria, K. Nawrocki, S. Nemecek, R. Nicolaidou, M. Nikolenko, A. Oblakowska-Mucha,V. Obraztsov, A. Olshevski,A. Onofre, R. Orava,K. Osterberg, A. Ouraou,A. Oyanguren,M. Paganoni,S. Paiano,J. P. Palacios,H. Palka,Th. D. Papadopoulou, L. Pape,C. Parkes, F. Parodi, U. Parzefall, A. Passeri,O. Passon,L. Peralta, V. Perepelitsa, A. Perrotta,A. Petrolini, J. Piedra, L. Pieri,F. Pierre,M. Pimenta, E. Piotto, T. Podobnik,V. Poireau, M. E. Pol,G. Polok,V. Pozdniakov,N. Pukhaeva, A. Pullia, D. Radojicic, P. Rebecchi, J. Rehn,D. Reid,R. Reinhardt, P. Renton,F. Richard,J. Ridky,M. Rivero,D. Rodriguez,A. Romero, P. Ronchese,P. Roudeau,T. Rovelli,V. Ruhlmann-Kleider, D. Ryabtchikov, A. Sadovsky,L. Salmi, J. Salt,C. Sander, A. Savoy-Navarro,U. Schwickerath, R. Sekulin, M. Siebel, A. Sisakian, G. Smadja,O. Smirnova,A. Sokolov,A. Sopczak, R. Sosnowski, T. Spassov, M. Stanitzki, A. Stocchi, J. Strauss,B. Stugu, M. Szczekowski, M. Szeptycka,T. Szumlak, T. Tabarelli,F. Tegenfeldt,J. Timmermans, L. Tkatchev,M. Tobin, S. Todorovova,B. Tome, A. Tonazzo, P. Tortosa,P. Travnicek, D. Treille, G. Tristram, M. Trochimczuk,C. Troncon,M-L. Turluer, I. A. Tyapkin, P. Tyapkin, S. Tzamarias, V. Uvarov, G. Valenti,P. Van Dam,J. Van Eldik,N. van Remortel,I. Van Vulpen, G. Vegni,F. Veloso,W. Venus,P. Verdier,V. Verzi, D. Vilanova,L. Vitale, V. Vrba, H. Wahlen, A. J. Washbrook,C. Weiser, D. Wicke,J. Wickens,G. Wilkinson,M. Winter,M. Witek, O. Yushchenko,A. Zalewska,P. Zalewski,D. Zavrtanik, V. Zhuravlov,N. I. Zimin, A. Zintchenko,M. Zupan

The European Physical Journal C(2011)

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摘要
The nature of b-quark jet hadronisation has been investigated using data taken at the Z peak by the DELPHI detector at LEP. Two complementary methods are used to reconstruct the energy of weakly decaying b-hadrons, E_B^weak . The average value of x^weak_B = E_B^weak/E_beam is measured to be 0.699±0.011. The resulting x^weak_B distribution is then analysed in the framework of two choices for the perturbative contribution (parton shower and Next to Leading Log QCD calculation) in order to extract measurements of the non-perturbative contribution to be used in studies of b-hadron production in other experimental environments than LEP. In the parton shower framework, data favour the Lund model ansatz and corresponding values of its parameters have been determined within PYTHIA 6.156 from DELPHI data: a= 1.84^+0.23_-0.21 b=0.642^+0.073_-0.063 GeV^-2, with a correlation factor ρ =92.2
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关键词
Systematic Uncertainty,Fragmentation Function,Parton Shower,Time Projection Chamber,Secondary Vertex
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