Evidence for Simultaneous Production of J/ψ and ϒ Mesons. V M Abazov , B Abbott , B S Acharya , M Adams , T Adams , J P Agnew , G D Alexeev , G Alkhazov , A Alton , A Askew , S Atkins , K Augsten , V Aushev , C Avila , F Badaud , L Bagby , B Baldin , D V Bandurin , S Banerjee , E Barberis , P Baringer , J F Bartlett , U Bassler , V Bazterra , A Bean , M Begalli , L Bellantoni , S B Beri , G Bernardi , R Bernhard , I Bertram , M Besançon , R Beuselinck , P C Bhat , S Bhatia , V Bhatnagar , G Blazey , S Blessing , K Bloom , A Boehnlein , D Boline , E E Boos , G Borissov , M Borysova , A Brandt , O Brandt , R Brock , A Bross , D Brown , X B Bu , M Buehler , V Buescher , V Bunichev , S Burdin , C P Buszello , E Camacho-Pérez , B C K Casey , H Castilla-Valdez , S Caughron , S Chakrabarti , K M Chan , A Chandra , E Chapon , G Chen , S W Cho , S Choi , B Choudhary , S Cihangir , D Claes , J Clutter , M Cooke , W E Cooper , M Corcoran , F Couderc , M-C Cousinou , J Cuth , D Cutts , A Das , G Davies , S J de Jong , E De La Cruz-Burelo , F Déliot , R Demina , D Denisov , S P Denisov , S Desai , C Deterre , K DeVaughan , H T Diehl , M Diesburg , P F Ding , A Dominguez , A Dubey , L V Dudko , A Duperrin , S Dutt , M Eads , D Edmunds , J Ellison , V D Elvira , Y Enari , H Evans , A Evdokimov , V N Evdokimov , A Fauré , L Feng , T Ferbel , F Fiedler , F Filthaut , W Fisher , H E Fisk , M Fortner , H Fox , J Franc , S Fuess , P H Garbincius , A Garcia-Bellido , J A García-González , V Gavrilov , W Geng , C E Gerber , Y Gershtein , G Ginther , O Gogota , G Golovanov , P D Grannis , S Greder , H Greenlee , G Grenier , Ph Gris , J-F Grivaz , A Grohsjean , S Grünendahl , M W Grünewald , T Guillemin , G Gutierrez , P Gutierrez , J Haley , L Han , K Harder , A Harel , J M Hauptman , J Hays , T Head , T Hebbeker , D Hedin , H Hegab , 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 , J Hogan , M Hohlfeld , J L Holzbauer , I Howley , Z Hubacek , V Hynek , I Iashvili , Y Ilchenko , R Illingworth , A S Ito , S Jabeen , M Jaffré , A Jayasinghe , M S Jeong , R Jesik , P Jiang , K Johns , E Johnson , M Johnson , A Jonckheere , P Jonsson , J Joshi , A W Jung , A Juste , E Kajfasz , D Karmanov , I Katsanos , M Kaur , R Kehoe , S Kermiche , N Khalatyan , A Khanov , A Kharchilava , Y N Kharzheev , I Kiselevich , J M Kohli , A V Kozelov , J Kraus , A Kumar , A Kupco , T Kurča , V A Kuzmin , S Lammers , P Lebrun , H S Lee , S W Lee , W M Lee , X Lei , J Lellouch , D Li , H Li , L Li , Q Z Li , J K Lim , D Lincoln , J Linnemann , V V Lipaev , R Lipton , H Liu , Y Liu , A Lobodenko , M Lokajicek , R Lopes de Sa , R Luna-Garcia , A L Lyon , A K A Maciel , R Madar , R Magaña-Villalba , S Malik , V L Malyshev , J Mansour , J Martínez-Ortega , R McCarthy , C L McGivern , M M Meijer , A Melnitchouk , D Menezes , P G Mercadante , M Merkin , A Meyer , J Meyer , F Miconi , N K Mondal , M Mulhearn , E Nagy , M Narain , R Nayyar , H A Neal , J P Negret , P Neustroev , H T Nguyen , T Nunnemann , J Orduna , N Osman , J Osta , A Pal , N Parashar , V Parihar , S K Park , R Partridge , N Parua , A Patwa , B Penning , M Perfilov , Y Peters , K Petridis , G Petrillo , P Pétroff , M-A Pleier , V M Podstavkov , A V Popov , M Prewitt , D Price , N Prokopenko , J Qian , A Quadt , B Quinn , P N Ratoff , I Razumov , I Ripp-Baudot , F Rizatdinova , M Rominsky , A Ross , C Royon , P Rubinov , R Ruchti , G Sajot , A Sánchez-Hernández , M P Sanders , A S Santos , G Savage , M Savitskyi , L Sawyer , T Scanlon , R D Schamberger , Y Scheglov , H Schellman , M Schott , C Schwanenberger , R Schwienhorst , J Sekaric , H Severini , E Shabalina , V Shary , S Shaw , A A Shchukin , V Simak , P Skubic , P Slattery , D Smirnov , G R Snow , J Snow , S Snyder , S Söldner-Rembold , L Sonnenschein , K Soustruznik , J Stark , D A Stoyanova , M Strauss , L Suter , P Svoisky , M Titov , V V Tokmenin , Y-T Tsai , D Tsybychev , B Tuchming , C Tully , L Uvarov , S Uvarov , S Uzunyan , R Van Kooten , W M van Leeuwen , N Varelas , E W Varnes , I A Vasilyev , A Y Verkheev , L S Vertogradov , M Verzocchi , M Vesterinen , D Vilanova , P Vokac , H D Wahl , M H L S Wang , J Warchol , G Watts , M Wayne , J Weichert , L Welty-Rieger , M R J Williams , G W Wilson , M Wobisch , D R Wood , T R Wyatt , Y Xie , R Yamada , S Yang , T Yasuda , Y A Yatsunenko , W Ye , Z Ye , H Yin , K Yip , S W Youn , J M Yu , J Zennamo , T G Zhao , B Zhou , J Zhu , M Zielinski , D Zieminska , L Zivkovic PHYSICAL REVIEW LETTERS（2016）
摘要
We report evidence for the simultaneous production of J/psi and Upsilon mesons in 8.1 fb(-1) of data collected at root s = 1.96 TeV by the D0 experiment at the Fermilab p (p) over bar Tevatron Collider. Events with these characteristics are expected to be produced predominantly by gluon-gluon interactions. In this analysis, we extract the effective cross section characterizing the initial parton spatial distribution, sigma(eff) = 2.2 +/- 0.7(stat) +/- 0.9(syst) mb.
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of<mmlmath xmlnsmml=http//wwww3org/1998/math/mathml, simultaneous production
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