Double parton interactions in γ+3 jet events in pp[over ¯] collisions at sqrt[s]=1.96 TeV
V. M. Abazov, B. Abbott, M. Abolins,B. S. Acharya,M. Adams, T. Adams, E. Aguilo, G. D. Alexeev, G. Alkhazov,A. Alton,G. Alverson, G. A. Alves, L. S. Ancu,M. Aoki,Y. Arnoud,M. Arov, A. Askew, B. Åsman, O. Atramentov,C. Avila,J. BackusMayes,F. Badaud,L. Bagby, B. Baldin,D. V. Bandurin,S. Banerjee,E. Barberis,A.-F. Barfuss, P. Baringer,J. Barreto, J. F. Bartlett, U. Bassler,D. Bauer,S. Beale,A. Bean,M. Begalli,M. Begel,C. Belanger-Champagne, L. Bellantoni,J. A. Benitez, S. B. Beri,G. Bernardi, R. Bernhard,I. Bertram,M. Besançon,R. Beuselinck,V. A. Bezzubov,P. C. Bhat,V. Bhatnagar,G. Blazey, S. Blessing,K. Bloom,A. Boehnlein,D. Boline, T. A. Bolton,E. E. Boos, G. Borissov,T. Bose,A. Brandt,R. Brock,G. Brooijmans, A. Bross,D. Brown,X. B. Bu, D. Buchholz,M. Buehler,V. Buescher,V. Bunichev, S. Burdin,T. H. Burnett, C. P. Buszello, P. Calfayan,B. Calpas, S. Calvet,E. Camacho-Pérez,J. Cammin, M. A. Carrasco-Lizarraga,E. Carrera,B. C. K. Casey,H. Castilla-Valdez, S. Chakrabarti, D. Chakraborty,K. M. Chan,A. Chandra, E. Cheu,S. Chevalier-Théry,D. K. Cho,S. W. Cho,S. Choi,B. Choudhary,T. Christoudias, S. Cihangir,D. Claes,J. Clutter, M. Cooke,W. E. Cooper, M. Corcoran, F. Couderc, M.-C. Cousinou, D. Cutts, M. Ćwiok,A. Das,G. Davies, K. De,S. J. de Jong,E. De La Cruz-Burelo,K. DeVaughan, F. Déliot, M. Demarteau,R. Demina,D. Denisov, S. P. Denisov,S. Desai,H. T. Diehl, M. Diesburg,A. Dominguez, T. Dorland,A. Dubey, L. V. Dudko, L. Duflot, D. Duggan,A. Duperrin,S. Dutt,A. Dyshkant, M. Eads, D. Edmunds, J. Ellison,V. D. Elvira, Y. Enari, S. Eno,H. Evans,A. Evdokimov, V. N. Evdokimov,G. Facini,A. V. Ferapontov, T. Ferbel,F. Fiedler, F. Filthaut, W. Fisher,H. E. Fisk,M. Fortner,H. Fox, S. Fuess, T. Gadfort, C. F. Galea, A. Garcia-Bellido, V. Gavrilov, P. Gay,W. Geist,W. Geng, D. Gerbaudo, C. E. Gerber, Y. Gershtein, D. Gillberg,G. Ginther,G. Golovanov,B. Gómez, A. Goussiou,P. D. Grannis,S. Greder,H. Greenlee, Z. D. Greenwood,E. M. Gregores,G. Grenier,Ph. Gris, J.-F. Grivaz, A. Grohsjean,S. Grünendahl, M. W. Grünewald,F. Guo, J. Guo, G. Gutierrez,P. Gutierrez,A. Haas, P. Haefner, S. Hagopian, J. Haley,I. Hall, L. Han, K. Harder, A. Harel,J. M. Hauptman, J. Hays, T. Hebbeker, D. Hedin,J. G. Hegeman, A. P. Heinson, U. Heintz, C. Hensel,I. Heredia De La Cruz,K. Herner,G. Hesketh, M. D. Hildreth, R. Hirosky,T. Hoang,J. D. Hobbs, B. Hoeneisen, M. Hohlfeld,S. Hossain,P. Houben,Y. Hu, Z. Hubacek,N. Huske, V. Hynek, I. Iashvili,R. Illingworth,A. S. Ito, S. Jabeen,M. Jaffré, S. Jain,D. Jamin,R. Jesik, K. Johns,C. Johnson, M. Johnson,D. Johnston,A. Jonckheere,P. Jonsson, A. Juste, E. Kajfasz,D. Karmanov,P. A. Kasper,I. Katsanos, V. Kaushik, R. Kehoe,S. Kermiche,N. Khalatyan, A. Khanov, A. Kharchilava,Y. N. Kharzheev,D. Khatidze,M. H. Kirby,M. Kirsch, J. M. Kohli,A. V. Kozelov,J. Kraus,A. Kumar, A. Kupco, T. Kurča,V. A. Kuzmin, J. Kvita,D. Lam, S. Lammers, G. Landsberg, P. Lebrun,H. S. Lee,W. M. Lee, A. Leflat,J. Lellouch,L. Li,Q. Z. Li, S. M. Lietti,J. K. Lim,D. Lincoln, J. Linnemann,V. V. Lipaev, R. Lipton,Y. Liu,Z. Liu,A. Lobodenko, M. Lokajicek,P. Love, H. J. Lubatti,R. Luna-Garcia,A. L. Lyon,A. K. A. Maciel,D. Mackin, P. Mättig,R. Magaña-Villalba, P. K. Mal,S. Malik, V. L. Malyshev, Y. Maravin,J. Martínez-Ortega,R. McCarthy,C. L. McGivern,M. M. Meijer,A. Melnitchouk,L. Mendoza,D. Menezes, P. G. Mercadante,M. Merkin, A. Meyer,J. Meyer, N. K. Mondal, T. Moulik, G. S. Muanza, M. Mulhearn,O. Mundal, L. Mundim,E. Nagy, M. Naimuddin, M. Narain,R. Nayyar, H. A. Neal,J. P. Negret,P. Neustroev, H. Nilsen, H. Nogima, S. F. Novaes, T. Nunnemann,G. Obrant,D. Onoprienko,J. Orduna,N. Osman,J. Osta,R. Otec,G. J. Otero y Garzón,M. Owen,M. Padilla, P. Padley,M. Pangilinan, N. Parashar,V. Parihar,S.-J. Park,S. K. Park, J. Parsons,R. Partridge,N. Parua, A. Patwa,B. Penning, M. Perfilov, K. Peters,Y. Peters,P. Pétroff, R. Piegaia,J. Piper, M.-A. Pleier,P. L. M. Podesta-Lerma,V. M. Podstavkov, M.-E. Pol,P. Polozov,A. V. Popov,M. Prewitt,D. Price, S. 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Uzunyan,P. J. van den Berg,R. Van Kooten,W. M. van Leeuwen, N. Varelas, E. W. Varnes,I. A. Vasilyev,P. Verdier,A. Y. Verkheev,L. S. Vertogradov,M. Verzocchi,M. Vesterinen,D. Vilanova,P. Vint, P. Vokac,H. D. Wahl,M. H. L. S. Wang, J. Warchol, G. Watts, M. Wayne,G. Weber, M. Weber, M. Wetstein, A. White, D. Wicke, M. R. J. Williams,G. W. Wilson, S. J. Wimpenny,M. Wobisch, D. R. Wood, T. R. Wyatt,Y. Xie,C. Xu, S. Yacoob,R. Yamada,W.-C. Yang,T. Yasuda,Y. A. Yatsunenko,Z. Ye,H. Yin,K. Yip, H. D. Yoo,S. W. Youn,J. Yu, C. Zeitnitz,S. Zelitch,T. Zhao,B. Zhou, J. Zhu, M. Zielinski, D. Zieminska,L. Zivkovic, V. Zutshi,E. G. Zverev
PHYSICAL REVIEW D（2010）
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摘要
We have used a sample of gamma + 3 jets events collected by the D0 experiment with an integrated luminosity of about 1 fb(-1) to determine the fraction of events with double parton scattering (f(DP)) in a single p (p) over bar collision at root s = 1.96 TeV. The DP fraction and effective cross section (sigma(eff)), a process-independent scale parameter related to the parton density inside the nucleon, are measured in three intervals of the second (ordered in p(T)) jet transverse momentum p(T)(jet2) within the range 15 <= p(T)(jet2) <= 30 GeV. In this range, f(DP) varies between 0.23 <= f(DP) <= 0.47, while sigma(eff) has the average value sigma(ave)(eff) = 16.4 +/- 0.3(stat) +/- 2.3(syst) mb.
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