Measurement of the ratio of branching fractions B ( B ± → J / ψ π ± ) / B ( B ± → J / ψ K ± )
Richard L Wagner,J Wagner,W Wagner,R Wallny, S M Wang,A Warburton,S Waschke,D J Waters,M Weinberger,W C Wester,B Whitehouse, D Whiteson,A B Wicklund, E Wicklund,G Williams,H H Williams,P Wilson, B L Winer, P Wittich,S Wolbers,C Wolfe,T Wright,Xin Wu,S M Wynne, A Yagil,Kenji Yamamoto, J Yamaoka,Takeshi Yamashita,Chuluo Yang,U K Yang,Y C Yang,W M Yao,G P Yeh,J Yoh,G Veramendi, V Veszpremi, R Vidal, I Vila,R Vilar,T Vine,I Vollrath, I Volobouev,G Volpi,F Wurthwein,P Wagner,K Yorita,Tetsuya Yoshida,G B Yu, I Yu, S S Yu, J C Yun, L Zanello,Adriana Zanetti,I Zaw,Xuezhi Zhang, J Zhou,S Zucchelli,A Abulencia,Jahred Adelman,T Affolder,T Akimoto, M G Albrow,D Ambrose,S Amerio, D Amidei, A Anastassov,K Anikeev, A Annovi, J Antos,Mayumi Aoki, G Apollinari,J F Arguin,T Arisawa,A Artikov,W Ashmanskas,A Attal, F Azfar,P Azzibacchetta,P Azzurri, N Bacchetta,W Badgett, A Barbarogaltieri, V E Barnes, B A Barnett,S Baroiant,V Bartsch,G Bauer,F Bedeschi, S Behari,S Belforte, G Bellettini,J Bellinger,A Belloni, D Benjamin, A Beretvas,J Beringer, T Berry, A Bhatti,M Binkley, D Bisello, R E Blair,C Blocker,B Blumenfeld, A Bocci,A Bodek, V 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,S Budroni, K Burkett, G Busetto,P Bussey,K L Byrum,Sandra Cabrera, M Campanelli,M Campbell,F Canelli,A Canepa,S Carillo, D Carlsmith,R Carosi,S Carron,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,I Cho,K Cho,D Chokheli, J P Chou, G Choudalakis, S H Chuang, Kyoil Chung,W H Chung, Y S Chung,M Ciljak,C I Ciobanu,M A Ciocci, A Clark,D Clark,M Coca,G Compostella,M E Convery, J Conway, B D Cooper, K Copic,M Cordelli, G Cortiana, F Crescioli,C Cuenca Almenar,J Cuevas,R Culbertson,J C Cully,Dianne Cyr,S Daronco,M Datta, S D Auria,Terry F Davies, M D Onofrio,D Dagenhart,P De Barbaro,S De Cecco,A Deisher,G De Lentdecker,M Dell Orso,F Delli Paoli, L Demortier, J Deng, M Deninno,D De Pedis,P F Derwent,G P Di Giovanni, C Dionisi,B Di Ruzza,J R Dittmann,P Dituro,C Dorr, S Donati, M Donega,P Dong, J Donini, T Dorigo,S Dube, J Efron, R Erbacher, D Errede, S Errede, R Eusebi, H C Fang,Sinead Farrington,I Fedorko,W T Fedorko,R G Feild, M Feindt,J P Fernandez,R C Field, G Flanagan,A Foland,S Forrester,G W Foster,M Franklin, J Freeman, I Furic,M Gallinaro,J Galyardt,J E Garcia, F Garberson,A F Garfinkel, C Gay,H Gerberich,D W Gerdes,S Giagu,P Giannetti,A Gibson,K Gibson,J L Gimmell,C M Ginsburg, N Giokaris,M Giordani,P Giromini,M Giunta, G Giurgiu,V Glagolev,D Glenzinski,Michael R Gold,N Goldschmidt,J Goldstein,A Golossanov, G Gomez,G Gomezceballos,M Goncharov,O Gonzalez,I Gorelov, A T Goshaw, K Goulianos,A Gresele, Mark D Griffiths,S Grinstein,C Grossopilcher, U Grundler,J Guimaraes Da Costa,Z Gunayunalan,C Haber,K Hahn,S R Hahn, E Halkiadakis,A R Hamilton,B Y Han,J Y Han,R Handler,F Happacher, K Hara,M Hare, S Harper, R F Harr,R M Harris,M Hartz, K Hatakeyama, J Hauser,A Heijboer,B Heinemann,J Heinrich, Cassandra E 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, Robert E Hughes,U Husemann, J Huston, J Incandela,G Introzzi,M Iori,Y Ishizawa,A Ivanov,B Iyutin, E James,D Jang,B Jayatilaka,D Jeans,H Jensen,E J Jeon, S Jindariani,M Jones,K K Joo,S Y Jun,J E Jung, T R Junk,T Kamon, P E Karchin,Yusuke Kato,Y Kemp,R Kephart,U Kerzel, V Khotilovich,B Kilminster, D H Kim, Heejung S Kim,J E Kim,Min Jung Kim,S B Kim,Y K Kim,Noriko Kimura,L Kirsch,S Klimenko,Markus Klute,B Knuteson,B R Ko,Kiminori Kondo, D J Kong,J Konigsberg, A Korytov, A V Kotwal,A Kovalev,A Kraan, J Kraus, Ilya Kravchenko,M Kreps, J Kroll, N Krumnack, M Kruse, V Krutelyov,Toshikazu Kubo,S E Kuhlmann, T Kuhr,Y Kusakabe,S Kwang, A T Laasanen,S Lai,S Lami,S Lammel,M Lancaster,R Lander,K Lannon, A Lath,G Latino,I Lazzizzera, T Lecompte,J Lee,Y J Lee, S W Lee,R 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Physical Review D（2009）
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摘要
We report a measurement of the ratio of branching fractions of the decays B{sup {+-}}{yields}J/{psi}{pi}{sup {+-}} and B{sup {+-}}{yields}J/{psi}K{sup {+-}} using the CDF II detector at the Fermilab Tevatron Collider. The signal from the Cabbibo-suppressed B{sup {+-}}{yields}J/{psi}{pi}{sup {+-}} decay is separated from B{sup {+-}}{yields}J/{psi}K{sup {+-}} using the B{sup {+-}}{yields}J/{psi}K{sup {+-}} invariant mass distribution and the kinematical differences of the hadron track in the two decay modes. From a sample of 220 pb{sup -1} of pp collisions at {radical}(s)=1.96 TeV, we observe 91{+-}15 B{sup {+-}}{yields}J/{psi}{pi}{sup {+-}} events together with 1883{+-}34 B{sup {+-}}{yields}J/{psi}K{sup {+-}} events. The ratio of branching fractions is found to be B(B{sup {+-}}{yields}J/{psi}{pi}{sup {+-}})/B(B{sup {+-}}{yields}J/{psi}K{sup {+-}})=(4.86{+-}0.82(stat){+-}0.15(syst))%.
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