Phys. Rev. Lett.
75,
624–628
(1995)
Form Factor Ratio Measurement in Λc+→Λe+νe
G. Crawford et al. (CLEO Collaboration)
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G. Crawford1, C. M. Daubenmier1, R. Fulton1, D. Fujino1, K. K. Gan1, K. Honscheid1, H. Kagan1, R. Kass1, J. Lee1, M. Sung1, C. White1, A. Wolf1, M. M. Zoeller1, F. Butler2, X. Fu2, B. Nemati2, W. R. Ross2, P. Skubic2, M. Wood2, M. Bishai3, J. Fast3, E. Gerndt3, J. W. Hinson3, R. L. McIlwain3, T. Miao3, D. H. Miller3, M. Modesitt3, D. Payne3, E. I. Shibata3, I. P. J. Shipsey3, P. N. Wang3, M. Battle4, J. Ernst4, L. Gibbons4, Y. Kwon4, S. Roberts4, E. H. Thorndike4, C. H. Wang4, J. Dominick5, M. Lambrecht5, S. Sanghera5, V. Shelkov5, T. Skwarnicki5, R. Stroynowski5, I. Volobouev5, G. Wei5, P. Zadorozhny5, M. Artuso6, M. Gao6, M. Goldberg6, D. He6, N. Horwitz6, G. C. Moneti6, R. Mountain6, F. Muheim6, Y. Mukhin6, S. Playfer6, Y. Rozen6, S. Stone6, X. Xing6, G. Zhu6, J. Bartelt7, S. E. Csorna7, Z. Egyed7, V. Jain7, D. Gibaut8, K. Kinoshita8, P. Pomianowski8, B. Barish9, M. Chadha9, S. Chan9, D. F. Cowen9, G. Eigen9, J. S. Miller9, C. O'Grady9, J. Urheim9, A. J. Weinstein9, M. Athanas10, W. Brower10, G. Masek, H. P. Paar10, J. Gronberg11, C. M. Korte11, R. Kutschke11, S. Menary11, R. J. Morrison11, S. Nakanishi11, H. N. Nelson11, T. K. Nelson11, C. Qiao11, J. D. Richman11, A. Ryd11, D. Sperka11, H. Tajima11, M. S. Witherell11, M. Procario12, R. Balest13, K. Cho13, W. T. Ford13, D. R. Johnson13, K. Lingel13, M. Lohner13, P. Rankin13, J. G. Smith13, J. P. Alexander14, C. Bebek14, K. Berkelman14, K. Bloom14, T. E. Browder14, D. G. Cassel14, H. A. Cho14, D. M. Coffman14, D. S. Crowcroft14, P. S. Drell14, D. J. Dumas14, R. Ehrlich14, P. Gaidarev14, M. Garcia-Sciveres14, B. Geiser14, B. Gittelman14, S. W. Gray14, D. L. Hartill14, B. K. Heltsley14, S. Henderson14, C. D. Jones14, S. L. Jones14, J. Kandaswamy14, N. Katayama14, P. C. Kim14, D. L. Kreinick14, G. S. Ludwig14, J. Masui14, J. Mevissen14, N. B. Mistry14, C. R. Ng14, E. Nordberg14, J. R. Patterson14, D. Peterson14, D. Riley14, S. Salman14, M. Sapper14, F. Würthwein14, P. Avery15, A. Freyberger15, J. Rodriguez15, S. Yang15, J. Yelton15, D. Cinabro16, T. Liu16, M. Saulnier16, R. Wilson16, H. Yamamoto16, T. Bergfeld17, B. I. Eisenstein17, G. Gollin17, B. Ong17, M. Palmer17, M. Selen17, J. J. Thaler17, K. W. Edwards18, M. Ogg18, A. Bellerive19, D. I. Britton19, E. R. F. Hyatt19, D. B. MacFarlane19, P. M. Patel19, B. Spaan19, A. J. Sadoff20, R. Ammar21, P. Baringer21, A. Bean21, D. Besson21, D. Coppage21, N. Copty21, R. Davis21, N. Hancock21, M. Kelly21, S. Kotov21, I. Kravchenko21, N. Kwak21, H. Lam21, Y. Kubota22, M. Lattery22, M. Momayezi22, J. K. Nelson22, S. Patton22, R. Poling22, V. Savinov22, S. Schrenk22, R. Wang22, M. S. Alam23, I. J. Kim23, Z. Ling23, A. H. Mahmood23, J. J. O'Neill23, H. Severini23, C. R. Sun23, and F. Wappler23 (CLEO Collaboration)
1Ohio State University, Columbus, Ohio 43210
2University of Oklahoma, Norman, Oklahoma 73019
3Purdue University, West Lafayette, Indiana 47907
4University of Rochester, Rochester, New York 14627
5Southern Methodist University, Dallas, Texas 75275
6Syracuse University, Syracuse, New York 13244
7Vanderbilt University, Nashville, Tennessee 37235
8Virginia Polytechnic Institute and State University, Blacksburg, Virginia 24061
9California Institute of Technology, Pasadena, California 91125
10University of California, San Diego, La Jolla, California 92093
11University of California, Santa Barbara, California 93106
12Carnegie Mellon University, Pittsburgh, Pennsylvania 15213
13University of Colorado, Boulder, Colorado 80309-0390
14Cornell University, Ithaca, New York 14853
15University of Florida, Gainesville, Florida 32611
16Harvard University, Cambridge, Massachusetts 02138
17University of Illinois, Champaign-Urbana, Illinois 61801
18Carleton University, Ontario, Canada K1S 5B6and the Institute of Particle Physics, Montréal, Canada
19McGill University, Montréal, Québec, Canada H3A 2T8and the Institute of Particle Physics, Montréal, Canada
20Ithaca College, Ithaca, New York 14850
21University of Kansas, Laẇrence, Kansas 66045
22University of Minnesota, Minneapolis, Minnesota 55455
23State University of New York at Albany, Albany, New York 12222
Received 13 January 1995; published in the issue dated 24 July 1995
The angular distributions of the decay Λc+→Λe+νe have been studied using the CLEO II detector. By performing a three-dimensional maximum likelihood fit, the form factor ratio R = f2/f1 is determined to be -0.25±0.14±0.08. The decay asymmetry parameter of the Λc averaged over q2 is calculated to be αΛc = -0.82-0.06-0.03+0.09+0.06.
© 1995 The American Physical Society
URL:
http://link.aps.org/doi/10.1103/PhysRevLett.75.624
DOI:
10.1103/PhysRevLett.75.624
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