Form-Factor Ratio Measurement In Lambda(+)(C)-]Lambda-E(+)Nu(E) G. Crawford , C M Daubenmier , R. Fulton , D. Fujino , K. Gan , K. Honscheid , H. Kagan , R. Kass , J. Lee , Mingyu Sung , C. White , Amaya I Wolf , M H Zoeller , Frank P Butler , X. Fu , B. Nemati , W R Ross , P. Skubic , Michael R Wood , M. Bishai , J. Fast , E. Gerndt , J W Hinson , R L Mcilwain , T. Miao , D H Miller , M. Modesitt , D G Payne , E I Shibata , I P J Shipsey , Pei Wang , M. Battle , J. Ernst , L. Gibbons , Youngsoo Kwon , Stephen J Roberts , E H Thorndike , Chunfu Wang , J. Dominick , M. Lambrecht , S. Sanghera , V G Shelkov , T. Skwarnicki , R. Stroynowski , I. Volobouev , G. Wei , P. Zadorozhny , M. Artuso , Min Gao , Michael J Goldberg , Daren He , N. Horwitz , G C Moneti , R. Mountain , F. Muheim , Y. Mukhin , S. Playfer , Y. Rozen , S. Stone , X. Xing , Guoyi Zhu , J. Bartelt , S E Csorna , Z. Egyed , Vinay K Jain , D B Gibaut , K. Kinoshita , P. Pomianowski , B C Barish , M. Chadha , Shingchow Chan , D F Cowen , G. Eigen , J S Miller , C. O'Grady , J. Urheim , A J Weinstein , M. Athanas , W S Brower , G E Masek , H P Paar , J. Gronberg , C M Korte , R. Kutschke , S. Menary , Richard J S Morrison , S. Nakanishi , Harry Norman Nelson , T K Nelson , C. Qiao , J D Richman , A. Ryd , D. Sperka , Hiroyasu Tajima , Michael S Witherell , M. Procario , R. Balest , K. Cho , W T Ford , D L Johnson , K. Lingel , M. Lohner , P. Rankin , J R Smith , J P Alexander , C. Bebek , K. Berkelman , K. Bloom , T E Browder , D G Cassel , H. Cho , D M Coffman , D S Crowcroft , P S Drell , D J P Dumas , Rodney I Ehrlich , P. Gaidarev , M. Garcia-Sciveres , B. Geiser , B. Gittelman , S W Gray , D L Hartill , B K Heltsley , S W Henderson , C R Jones , S J Jones , J. Kandaswamy , N. Katayama , P. Kim , D L Kreinick , G S Ludwig , J. Masui , J. Mevissen , N B Mistry , C. Ng , E. Nordberg , J R Patterson , David A M Peterson , D. Riley , S. Salman , M. Sapper , F. Würthwein , P. Avery , A. Freyberger , J L Rodriguez , Sen Yang , J. Yelton , D. Cinabro , Tayjian Liu , M. Saulnier , Richard K Wilson , Hisashi Yamamoto , T. Bergfeld , B I Eisenstein , G D Gollin , B. Ong , Mary J Palmer , M. Selen , J J Thaler , K W Edwards , M. Ogg , A. Bellerive , D. Britton , E R F Hyatt , D B Macfarlane , P M Patel , B. Spaan , A J Sadoff , R. Ammar , P. Baringer , A. Bean , D. Besson , D. Coppage , N. Copty , Ronald M Davis , N. Hancock , Michael P Kelly , S. Kotov , Ilya Kravchenko , N. Kwak , Honming Lam , Y. Kubota , M. Lattery , M. Momayezi , J K Nelson , S. Patton , R. Poling , V. Savinov , S. Schrenk , R. Wang , M S Alam , I. Kim , Z. Ling , A H Mahmood , J. O'Neill , H. Severini , C. Sun , F R Wappler PHYSICAL REVIEW LETTERS（1995）
摘要
The angular distributions of the decay Lambda(c)(+) --> Lambda e(+)nu(e) have been studied using the CLEO II detector. By performing a three-dimensional maximum likelihood fit, the form factor ratio R = f(2)/f(1) is determined to be -0.25 +/- 0.14 +/- 0.08. The decay asymmetry parameter of the Lambda(c) averaged over q(2) is calculated to be alpha(Lambda c) = -0.82(-0.06-0.03)(+0.09+0.06) .
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关键词
maximum likelihood, three dimensional, particle physics, form factor
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