Direct measurement of the pseudoscalar decay constant, {ital f}{sub {ital D}{sub {ital s}}}

Journal Article · Mon Jun 05 00:00:00 EDT 1995 · Physical Review Letters

DOI:https://doi.org/10.1103/PhysRevLett.74.4599· OSTI ID:91885

Bai, J Z; Bardon, O; Blum, I; Breakstone, A; Burnett, T; Chen, G P; Chen, H F; Chen, J; Chen, S J; Chen, S M; Chen, Y; Chen, Y B; Chen, Y Q; Cheng, B S; Cowan, R F; Cui, H C; Cui, X Z; Ding, H L; Du, Z Z; Dunwoodie, W ; Fan, X L; Fang, J; Fero, M; Gao, C S; Gao, M L; Gao, S Q; Gao, W X; Gratton, P; Gu, J H; Gu, S D; Gu, W X; Gu, Y F; Guo, Y N; Han, S W; Han, Y; Harris, F A; Hatanaka, M; He, J; He, K R; He, M; Hitlin, D G; Hu, G Y; Hu, H B; Hu, T; Hu, X Q; Huang, D Q; Huang, Y Z; Izen, J M; Jia, Q P; Jiang, C H; Jin, Y; Jones, L; Kang, S H; Kelsey, M H; Kim, B K; Lai, Y F; Lan, H B; Lang, P F; Lankford, A; Li, F; Li, J; Li, P Q; Li, Q; Li, R B; Li, W; Li, W D; Li, W G; Li, X; Li, X N; Lin, S Z; Liu, H M; Liu, J H; Liu, Q; Liu, R G; Liu, Y; Liu, Z A; Lou, X C; Lowery, B; Lu, J G; Ma, A M; Ma, E C; Ma, J M; Mao, H S; Mao, Z P; Malchow, R; Mandelkern, M; Meng, X C; Ni, H L; Nie, J; Olsen, S L; Oyang, J; Paluselli, D; Pan, L J; Panetta, J; Porter, F; Prabhakar, E; Qi, N D; Que, Y K; Quigley, J; Rong, G; Schernau, M; Schmid, B; Schultz, J; Shao, Y Y; Shen, D L; Shen, H; Shen, X Y; Sheng, H Y; Shi, H Z; Shi, X R; Smith, A; Soderstrom, E; Song, X F; Standifird, J; Stoker, D; Sun, F; Sun, H S; Sun, S J; Synodinos, J; Tan, Y P; Tang, S Q; Toki, W; Tong, G L; Torrence, E; Wang, F; Wang, L S; Wang, L Z; Wang, M; Wang, P; Wang, P L; Wang, S M; Wang, T J; Wang, W; Wang, Y Y; Whittaker, S; Wilson, R; Wisniewski, W J; Xi, D M; Xia, X M; Xie, P P; Xu, D Z; Xu, R S; Xu, Z Q; Xue, S T; Yamamoto, R; Yan, J; Yan, W G; Yang, C M; Yang, C Y; Yang, W; Yao, H B; Ye, M H; Ye, S Z; Yu, C S; Yu, C X; Yu, Z Q; Yuan, C Z; Zhang, B Y; Zhang, C C; Zhang, D H; Zhang, H L; Zhang, J; Zhang, J W; Zhang, L S; Zhang, S Q; Zhang, Y; Zhang, Y Y; Zhao, D X; Zhao, J W; Zhao, M; Zhao, P D; Zhao, W R; Zhao, W X; Zheng, J P

The Beijing Spectrometer (BES) experiment has observed purely leptonic decays of the {ital D}{sub {ital s}} meson in the reaction {ital e}{sup +}{ital e}{sup {minus}}{r_arrow}{ital D}{sub {ital s}}{sup +}{ital D}{sub {ital s}}{sup {minus}} at a c.m. energy of 4.03 GeV. Three events are observed in which one {ital D}{sub {ital s}} decays hadronically to {phi}{pi}, {ital K}{ovr {sup 0}}{ital K}, and the other decays leptonically to {mu}{nu}{sub {mu}} or {tau}{nu}{sub {tau}}. With the assumption of {mu}{minus}{tau} universality, values of the branching fraction, {ital B}({ital D}{sub {ital s}}{r_arrow}{mu}{nu}{sub {mu}})=(1.5{sub {minus}0.6{minus}0.2}{sup +1.3+0.3})%, and the {ital D}{sub {ital s}} pseudoscalar decay constant, {ital f}{sub {ital D}{sub {ital s}}}=(4.3{sub {minus}1.3{minus}0.4}{sup +1.5+0.4}){times}10{sup 2} MeV, are obtained.

• Research Organization: Boston University
• DOE Contract Number: FG02-91ER40676; FG03-92ER40701; FG03-93ER40788; AC02-76ER03069
• OSTI ID: 91885
• Journal Information: Physical Review Letters, Vol. 74, Issue 23; Other Information: PBD: 5 Jun 1995
• Country of Publication: United States
• Language: English

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