Polarizations Of J/Psi And Psi(2s) Mesons Produced In P(P)Over-Bar Collisins At Root S-1.96 Tev
A Abulencia,J Adelman,T Affolder,T Akimoto,M G Albrow,S Amerio,D Amidei,A Anastassov,K Anikeev,A Annovi,J Antos,M Aoki,G Apollinari,T Arisawa,A Artikov,W Ashmanskas,A Attal,A Aurisano,F Azfar,P Azzibacchetta,P Azzurri,N Bacchetta,W Badgett,A Barbarogaltieri,V E Barnes,B A Barnett,S Baroiant,Bartsch,G Bauer,F Bedeschi,S Behari,G Bellettini,J Bellinger,A Belloni,D Benjamin,A Beretvas,J Beringer,T Berry,A Bhatti,M Binkley,D Bisello,I Bizjak,R E Blair,C Blocker,B Blumenfeld,A Bocci,A Bodek, Boisvert,G Bolla,A Bolshov,D Bortoletto,J Boudreau,A Boveia,B Brau,L Brigliadori,C Bromberg,E Brubaker,J Budagov,H S Budd,S Budd,K Burkett,G Busetto,P Bussey,A Buzatu,K L Byrum,S Cabrera,M Campanelli,M Campbell,F Canelli,A Canepa,S Carillo, D Carlsmith,R Carosi,S Carron,B Casal,M Casarsa,A Castro,P Catastini,D Cauz,M Cavallisforza,A Cerri,L Cerrito,S H Chang,Y C Chen,M Chertok,G Chiarelli,G Chlachidze,F Chlebana,Iksung Cho,K Cho,D Chokheli,J P Chou,G Choudalakis,S H Chuang,K Chung,W H Chung,Y S Chung,M 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Goncharov,O Gonzalez,I Gorelov,A T Goshaw,K Goulianos, A Gresele,S Grinstein,C Grossopilcher,U Grundler,J G Da Costa,Z Gunayunalan,C Haber,K Hahn, Hahn,E Halkiadakis,A Hamilton,B Y Han,Jy Han,R Handler,F Happacher,K Hara,D Hare,M Hare,S Harper,R F Harr,R M Harris,M Hartz,K Hatakeyama,J Hauser,C Hays,M Heck,A Heijboer,B Heinemann,J Heinrich,Colin J Henderson,M Herndon,J Heuser,D Hidas,C Hill,D Hirschbuehl,A Hocker,A Holloway,S Hou,M Houlden,S C Hsu,B T Huffman,R E Hughes,U Husemann,Joseph P Huston,J Incandela,G Introzzi,M Iori,A L Ivanov,B Iyutin,E James,D Jang,B Jayatilaka,D Jeans,E J Jeon,S Jindariani,W A Johnson,Mark K Jones,K K Joo,Sy Jun,Je Jung,T R Junk,T Kamon,P E Karchin,Y Kato,Y Kemp,R Kephart,U Kerzel, Khotilovich,B Kilminster,Doh Hoon Kim,H S Kim, Je Kim,M J Kim,S H Kim,Y K Kim,N Kimura,L Kirsch,S Klimenko,M Klute,B Knuteson,B R Ko,K Kondo,D J Kong,J Konigsberg,A Korytov,A V Kotwal,A Kraan,J Kraus,M Kreps,J Kroll,N Krumnack,M Kruse, Krutelyov,Takeshi Kubo,S E Kuhlmann,T 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PHYSICAL REVIEW LETTERS（2007）
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摘要
We have measured the polarizations of J/psi and psi(2S) mesons as functions of their transverse momentum p(T) when they are produced promptly in the rapidity range |y|< 0.6 with p(T)>= 5 GeV/c. The analysis is performed using a data sample with an integrated luminosity of about 800 pb(-1) collected by the CDF II detector. For both vector mesons, we find that the polarizations become increasingly longitudinal as p(T) increases from 5 to 30 GeV/c. These results are compared to the predictions of nonrelativistic quantum chromodynamics and other contemporary models. The effective polarizations of J/psi and psi(2S) mesons from B-hadron decays are also reported.
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physics,multidisciplinary
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