First measurement of gamma(D*(+)).

/ Authors

S. Ahmed, M. Alam, S. Athar, L. Jian, L. Ling, M. Saleem, S. Timm, F. Wappler, A. Anastassov, E. Eckhart

and 150 more authors

K. Gan, C. Gwon, T. Hart, K. Honscheid, D. Hufnagel, H. Kagan, R. Kass, T. Pedlar, J. Thayer, E. Von Toerne, M. Zoeller, S. Richichi, H. Severini, P. Skubic, A. Undrus, V. Savinov, S. Chen, J. Hinson, J. Lee, D. Miller, E. Shibata, I. Shipsey, V. Pavlunin, D. Cronin-Hennessy, A. Lyon, W. Park, E. Thorndike, T. Coan, Y. Gao, Y. Maravin, I. Narsky, R. Stroynowski, J. Ye, T. Wlodek, M. Artuso, Kamal Benslama, C. Boulahouache, K. Bukin, E. Dambasuren, G. Majumder, R. Mountain, T. Skwarnicki, S. Stone, J. Wang, A. Wolf, S. Kopp, M. Kostin, A. Mahmood, S. Csorna, I. Dankó, V. Jain, K. W. McLean, Z. Xu, R. Godang, G. Bonvicini, D. Cinabro, M. Dubrovin, S. Mcgee, Adi Bornheim, E. Lipeles, S. Pappas, A. Shapiro, W. Sun, A. Weinstein, D. Jaffe, R. Mahapatra, G. Masek, H. Paar, A. Eppich, T. Hill, R. Morrison, H. Nelson, R. Briere, G. Chen, T. Ferguson, H. Vogel, J. Alexander, C. Bebek, B. Berger, K. Berkelman, F. Blanc, V. Boisvert, D. Cassel, P. Drell, J. Duboscq, K. Ecklund, R. Ehrlich, P. Gaidarev, L. Gibbons, B. Gittelman, S. Gray, D. Hartill, B. Heltsley, L. Hsu, C. Jones, J. Kandaswamy, D. Kreinick, M. Lohner, A. Magerkurth, H. Mahlke-Krüger, T. Meyer, N. Mistry, E. Nordberg, M. Palmer, J. Patterson, D. Peterson, D. Riley, A. Romano, H. Schwarthoff, J. Thayer, D. Urner, B. Valant-Spaight, G. Viehhauser, A. Warburton, P. Avery, C. Prescott, A. Rubiera, H. Stoeck, J. Yelton, G. Brandenburg, A. Ershov, D. Kim, R. Wilson, B. Eisenstein, J. Ernst, G. Gladding, G. Gollin, R. M. Hans, E. Johnson, I. Karliner, M. A. Marsh, C. Plager, C. Sedlack, M. Selen, J. Thaler, J. Williams, K. Edwards, A. Sadoff, R. Ammar, A. Bean, D. Besson, X. Zhao, S. Anderson, V. Frolov, Y. Kubota, S. J. Lee, R. Poling, A. Smith, C. Stepaniak, J. Urheim

/ Abstract

We present the first measurement of the D*(+) width using 9/fb of e(+)e(-) data collected near the Upsilon(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*(+)-->D(0)pi(+) decay. We find gamma(D*(+)) = 96+/-4 (stat)+/-22 (syst) keV. We also measure the energy release in the decay and compute Delta m identical with m(D*(+))-m(D(0)) = 145.412+/-0.002 (stat)+/-0.012 (syst) MeV/c(2).

Journal: Physical review letters

DOI: 10.1103/PhysRevLett.87.251801