First observation of the decay c+0ee and an estimate of the c+ c0 lifetime ratio

J. P. Alexander, C. Bebek, Karl Berkelman,Kenneth Bloom, T. E. Browder, D. G. Cassel, H. A. Cho, D. M. Coffman, D. S. Crowcroft, P. S. Drell, D. J. Dumas, R. Ehrlich, P. Gaidarev,Maurice Garcia-Sciveres, B. Geiser, B. Gittelman, S. W. Gray,D. L. Hartill,B. K. Heltsley,Shawn W. Henderson,C. D. Jones,S. L. Jones, J. Kandaswamy, N. Katayama,P. C. Kim,D. L. Kreinick,G. S. Ludwig, J. Masui, J. Mevissen,N. B. Mistry,C. R. Ng, E. Nordberg,Juliet Ritchie Patterson, D. Peterson, D. Riley,S. Salman, M. Sapper, F. Ẅrthwein, Paul Avery, A. P. Freyberger,Jorge Luis Rodriguez,Shengfeng Yang, John Yelton,D. Cinabro,T. Liu, M. Saulnier,Richard Wilson, H. Yamamoto, T. Bergfeld,B. I. Eisenstein, George D Gollin, B. Ong, M.A. Palmer, Mats A Selen, J. J. Thaler, K. W. Edwards, M. Ogg, Alain Bellerive, Dave Britton, E. R.F. Hyatt, D. B. MacFarlane, P. M. Patel, B. Spaan, A. J. Sadoff, R. Ammar, Philip Baringer, Alice Bean, D. Z. Besson, D. Coppage, N. Copty, R. Davis, N. Hancock, M. L. Kelly, S. Kotov,Ilya Kravchenko, N. Kwak,Ha Lam, Yuichi Kubota, M. Lattery, M. Momayezi, J. K. Nelson, S. Patton, R. Poling, V. Savinov, S. Schrenk, Ruifang Wang,M. S. Alam, I. J. Kim, Z. Ling, A. H. Mahmood, J. J. O'Neill, H. Severini, C. R. Sun, F. R. Wappler, G. Crawford, C. M. Daubenmier, R. Fulton, D. Fujino, K. K. Gan, K. Honscheid

Physical Review Letters（1995）

引用 0|浏览0

暂无评分

摘要

Using the CLEO II detector at the Cornell Electron Storage Ring we have observed the decay modes {Xi}{sup +}{sub {ital c}}{r_arrow}{Xi}{sup 0}{ital e}{sup +}{nu}{sub {ital e}} and {Xi}{sup 0}{sub {ital c}}{r_arrow}{Xi}{sup {minus}}{ital e}{sup +}{nu}{sub {ital e}} by the detection of a {Xi}-positron pair of appropriate invariant mass. We find {ital B} ({Xi}{sup +}{sub {ital c}}{r_arrow}{Xi}{sup 0}{ital e}{sup +}{nu}{sub {ital e}}){sigma}({ital e}{sup +}{ital e}{sup {minus}}{r_arrow} {Xi}{sup +}{sub {ital cX}})=1.55{plus_minus}0.33{plus_minus}0.25 pb, {ital B} ({Xi}{sup 0}{sub {ital c}}{r_arrow}{Xi}{sup {minus}}{ital e}{sup +}{nu}{sub {ital e}}){sigma}({ital e}{sup +}{ital e}{sup {minus}}{r_arrow} {Xi}{sup 0}{sub {ital cX}})=0.63{plus_minus}0.12{plus_minus}0.10 pb, {ital B} ({Xi}{sup +}{sub {ital c}}{r_arrow}{Xi}{sup {minus}}{pi}{sup +}{pi}{sup +})/ {ital B} ({Xi}{sup +}{sub {ital c}}{r_arrow}{Xi}{sup 0}{ital e}{sup +}{nu}{sub {ital e}})= 0.44{plus_minus}0.11{sub {minus}0.06}{sup +0.11}, and {ital B} ({Xi}{sup 0}{sub {ital c}}{r_arrow}{Xi}{sup {minus}}{pi}{sup +})/{ital B} ({Xi}{sup 0}{sub {ital c}}{r_arrow}{Xi}{sup {minus}}{ital e}{sup +}{nu}{sub {ital e}})= 0.32{plus_minus}0.10{sub {minus}0.03}{sup +0.05}. Assuming the {Xi}{sup +}{sub {ital c}} and {Xi}{sup 0}{sub {ital c}} are equally produced in {ital e}{sup +}{ital e}{sup {minus}} annihilation events at 10 GeV, the lifetime ratio of {Xi}{sup +}{sub {ital c}}/{Xi}{sup 0}{sub {ital c}} is measured to be 2.46{plus_minus}0.70{sub {minus}0.23}{sup +0.33}.

查看译文

AI 理解论文

溯源树

样例

生成溯源树，研究论文发展脉络

Chat Paper

正在生成论文摘要