Phys. Rev. D
66,
031101(R)
(2002)
[5 pages]
Measurement of B(B-→D0π-) and B(B0→D+π-) and isospin analysis of B̅ →Dπ decays
S. Ahmed et al. (CLEO Collaboration)
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S. Ahmed1, M. S. Alam1, L. Jian1, M. Saleem1, F. Wappler1, E. Eckhart2, K. K. Gan2, C. Gwon2, T. Hart2, K. Honscheid2, D. Hufnagel2, H. Kagan2, R. Kass2, T. K. Pedlar2, J. B. Thayer2, E. von Toerne2, T. Wilksen2, M. M. Zoeller2, H. Muramatsu3, S. J. Richichi3, H. Severini3, P. Skubic3, S. A. Dytman4, J. A. Mueller4, S. Nam4, V. Savinov4, S. Chen5, J. W. Hinson5, J. Lee5, D. H. Miller5, V. Pavlunin5, E. I. Shibata5, I. P. J. Shipsey5, D. Cronin-Hennessy6, A. L. Lyon6, C. S. Park6, W. Park6, E. H. Thorndike6, T. E. Coan7, Y. S. Gao7, F. Liu7, Y. Maravin7, R. Stroynowski7, M. Artuso8, C. Boulahouache8, K. Bukin8, E. Dambasuren8, K. Khroustalev8, R. Mountain8, R. Nandakumar8, T. Skwarnicki8, S. Stone8, J. C. Wang8, A. H. Mahmood9, S. E. Csorna10, I. Danko10, G. Bonvicini11, D. Cinabro11, M. Dubrovin11, S. McGee11, A. Bornheim12, E. Lipeles12, S. P. Pappas12, A. Shapiro12, W. M. Sun12, A. J. Weinstein12, R. Mahapatra13, R. A. Briere14, G. P. Chen14, T. Ferguson14, G. Tatishvili14, H. Vogel14, N. E. Adam15, J. P. Alexander15, K. Berkelman15, V. Boisvert15, D. G. Cassel15, P. S. Drell15, J. E. Duboscq15, K. M. Ecklund15, R. Ehrlich15, L. Gibbons15, B. Gittelman15, S. W. Gray15, D. L. Hartill15, B. K. Heltsley15, L. Hsu15, C. D. Jones15, J. Kandaswamy15, D. L. Kreinick15, A. Magerkurth15, H. Mahlke-Krüger15, T. O. Meyer15, N. B. Mistry15, E. Nordberg15, J. R. Patterson15, D. Peterson15, J. Pivarski15, D. Riley15, A. J. Sadoff15, H. Schwarthoff15, M. R. Shepherd15, J. G. Thayer15, D. Urner15, B. Valant-Spaight15, G. Viehhauser15, A. Warburton15, M. Weinberger15, S. B. Athar16, P. Avery16, L. Breva-Newell16, V. Potlia16, H. Stoeck16, J. Yelton16, G. Brandenburg17, D. Y.-J. Kim17, R. Wilson17, K. Benslama18, B. I. Eisenstein18, J. Ernst18, G. D. Gollin18, R. M. Hans18, I. Karliner18, N. Lowrey18, M. A. Marsh18, C. Plager18, C. Sedlack18, M. Selen18, J. J. Thaler18, J. Williams18, K. W. Edwards19, R. Ammar20, D. Besson20, X. Zhao20, S. Anderson21, V. V. Frolov21, Y. Kubota21, S. J. Lee21, S. Z. Li21, R. Poling21, A. Smith21, C. J. Stepaniak21, J. Urheim21, Z. Metreveli22, K. K. Seth22, A. Tomaradze22, and P. Zweber22 (CLEO Collaboration)
1State University of New York at Albany, Albany, New York 12222
2Ohio State University, Columbus, Ohio 43210
3University of Oklahoma, Norman, Oklahoma 73019
4University of Pittsburgh, Pittsburgh, Pennsylvania 15260
5Purdue University, West Lafayette, Indiana 47907
6University of Rochester, Rochester, New York 14627
7Southern Methodist University, Dallas, Texas 75275
8Syracuse University, Syracuse, New York 13244
9University of Texas–Pan American, Edinburg, Texas 78539
10Vanderbilt University, Nashville, Tennessee 37235
11Wayne State University, Detroit, Michigan 48202
12California Institute of Technology, Pasadena, California 91125
13University of California, Santa Barbara, California 93106
14Carnegie Mellon University, Pittsburgh, Pennsylvania 15213
15Cornell University, Ithaca, New York 14853
16University of Florida, Gainesville, Florida 32611
17Harvard University, Cambridge, Massachusetts 02138
18University of Illinois, Urbana-Champaign, Illinois 61801
19Carleton University, Ottawa, Ontario, Canada K1S 5B6the Institute of Particle Physics, Canada M5S 1A7
20University of Kansas, Lawrence, Kansas 66045
21University of Minnesota, Minneapolis, Minnesota 55455
22Northwestern University, Evanston, Illinois 60208
Received 12 June 2002; published 22 August 2002
We present new measurements of branching fractions for the color-favored decays B-→D0π- and B0→D+π-. Using 9.67×106BB̅ pairs collected with the CLEO detector, we obtain the branching fractions B(B-→D0π-)=(49.7±1.2±2.9±2.2)×10-4 and B(B0→D+π-)=(26.8±1.2±2.4±1.2)×10-4. The first error is statistical, the second is systematic, and the third is due to the experimental uncertainty on the production ratio of charged and neutral B mesons in Υ(4S) decays. These results, together with the current world average for the color-suppressed branching fraction B(B0→D0π0), are used to determine the cosine of the strong phase difference δI between the I=1/2 and I=3/2 isospin amplitudes. We find cosδI=0.863-0.023-0.035-0.030+0.024+0.036+0.038, and obtain a 90% confidence interval of 16.5°<δI<38.1°. This nonzero value of δI suggests the presence of final state interactions in the Dπ system.
© 2002 The American Physical Society
URL:
http://link.aps.org/doi/10.1103/PhysRevD.66.031101
DOI:
10.1103/PhysRevD.66.031101
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