Phys. Rev. Lett.
87,
251801
(2001)
[5 pages]
First Measurement of Γ(D*+)
S. Ahmed et al. (CLEO Collaboration)
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S. Ahmed1, M. S. Alam1, S. B. Athar1, L. Jian1, L. Ling1, M. Saleem1, S. Timm1, F. Wappler1, A. Anastassov2, 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, M. M. Zoeller2, S. J. Richichi3, H. Severini3, P. Skubic3, A. Undrus3, V. Savinov4, S. Chen5, J. W. Hinson5, J. Lee5, D. H. Miller5, E. I. Shibata5, I. P. J. Shipsey5, V. Pavlunin5, D. Cronin-Hennessy6, A. L. Lyon6, W. Park6, E. H. Thorndike6, T. E. Coan7, Y. S. Gao7, Y. Maravin7, I. Narsky7, R. Stroynowski7, J. Ye7, T. Wlodek7, M. Artuso8, K. Benslama8, C. Boulahouache8, K. Bukin8, E. Dambasuren8, G. Majumder8, R. Mountain8, T. Skwarnicki8, S. Stone8, J. C. Wang8, A. Wolf8, S. Kopp9, M. Kostin9, A. H. Mahmood10, S. E. Csorna11, I. Danko11, V. Jain11,*, K. W. McLean11, Z. Xu11, R. Godang12, G. Bonvicini13, D. Cinabro13, M. Dubrovin13, S. McGee13, A. Bornheim14, E. Lipeles14, S. P. Pappas14, A. Shapiro14, W. M. Sun14, A. J. Weinstein14, D. E. Jaffe15, R. Mahapatra15, G. Masek15, H. P. Paar15, A. Eppich16, T. S. Hill16, R. J. Morrison16, H. N. Nelson16, R. A. Briere17, G. P. Chen17, T. Ferguson17, H. Vogel17, J. P. Alexander18, C. Bebek18, B. E. Berger18, K. Berkelman18, F. Blanc18, V. Boisvert18, D. G. Cassel18, P. S. Drell18, J. E. Duboscq18, K. M. Ecklund18, R. Ehrlich18, P. Gaidarev18, L. Gibbons18, B. Gittelman18, S. W. Gray18, D. L. Hartill18, B. K. Heltsley18, L. Hsu18, C. D. Jones18, J. Kandaswamy18, D. L. Kreinick18, M. Lohner18, A. Magerkurth18, H. Mahlke-Krüger18, T. O. Meyer18, N. B. Mistry18, E. Nordberg18, M. Palmer18, J. R. Patterson18, D. Peterson18, D. Riley18, A. Romano18, H. Schwarthoff18, J. G. Thayer18, D. Urner18, B. Valant-Spaight18, G. Viehhauser18, A. Warburton18, P. Avery19, C. Prescott19, A. I. Rubiera19, H. Stoeck19, J. Yelton19, G. Brandenburg20, A. Ershov20, D. Y.-J. Kim20, R. Wilson20, B. I. Eisenstein21, J. Ernst21, G. E. Gladding21, G. D. Gollin21, R. M. Hans21, E. Johnson21, I. Karliner21, M. A. Marsh21, C. Plager21, C. Sedlack21, M. Selen21, J. J. Thaler21, J. Williams21, K. W. Edwards22a,22b, A. J. Sadoff23, R. Ammar24, A. Bean24, D. Besson24, X. Zhao24, S. Anderson25, V. V. Frolov25, Y. Kubota25, S. J. Lee25, R. Poling25, A. Smith25, C. J. Stepaniak25, and J. Urheim25 (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, Austin, Texas 78712
10University of Texas–Pan American, Edinburg, Texas 78539
11Vanderbilt University, Nashville, Tennessee 37235
12Virginia Polytechnic Institute and State University, Blacksburg, Virginia 24061
13Wayne State University, Detroit, Michigan 48202
14California Institute of Technology, Pasadena, California 91125
15University of California–San Diego, La Jolla, California 92093
16University of California, Santa Barbara, California 93106
17Carnegie Mellon University, Pittsburgh, Pennsylvania 15213
18Cornell University, Ithaca, New York 14853
19University of Florida, Gainesville, Florida 32611
20Harvard University, Cambridge, Massachusetts 02138
21University of Illinois, Urbana-Champaign, Illinois 61801
22aCarleton University, Ottawa, Ontario, Canada K1S 5B6
22band the Institute of Particle Physics, Canada
23Ithaca College, Ithaca, New York 14850
24University of Kansas, Lawrence, Kansas 66045
25University of Minnesota, Minneapolis, Minnesota 55455
Received 7 August 2001; published 28 November 2001
We present the first measurement of the D*+ width using 9/fb of e+e- data collected near the ϒ(4S) resonance by the CLEO II.V detector. Our method uses advanced tracking techniques and a reconstruction method that takes advantage of the small vertical size of the Cornell Electron-positron Storage Ring beam spot to measure the energy release distribution from the D*+→D0π+ decay. We find Γ(D*+) = 96±4(stat)±22(syst)keV. We also measure the energy release in the decay and compute Δm≡mD*+-mD0 = 145.412±0.002(stat)±0.012(syst)MeV/c2.
© 2001 The American Physical Society
URL:
http://link.aps.org/doi/10.1103/PhysRevLett.87.251801
DOI:
10.1103/PhysRevLett.87.251801
*Permanent address: Brookhaven National Laboratory, Upton, NY 11973.
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