Measurement Of Inclusive Semileptonic Branching Fractions For D--> E(-) X And (D-0)Over-Bar -> E- X

Jz Bai,Y Ban,Jg Bian,Jf Chang,Ad Chen,Hf Chen,Hs Chen,Jc Chen,Xd Chen,Yb Chen,Bs Cheng,Sp Chi,Yp Chu,Xz Cui,Ys Dai,Ly Dong,Zz Du,Hy Fu,Lp Fu,Cs Gao,Sd Gu,Zj Guo,Yn Guo,Sw Han,Y Han,Jt He,J He,Kl He,M He,X He,Yk Heng,T Hong,Gy Hu,Hm Hu,Qh Hu,T Hu,Gs Huang,Xp Huang,Yz Huang,Xb Ji,Ch Jiang,Y Jin,Zj Ke,Yf Lai,D Li,Hb Li,Hh Li, Jc Li,J Li,Pq Li,Qj Li,Ry Li, W Li,Wg Li,Xn Li,Xq Li,B Liu,F Liu,Hm Liu, J Liu, Jp Liu,Rg Liu,Tr Liu,Y Liu,Zx Liu,F Liu,Gr Lu,F Lu,Jg Lu,Zj Lu,Xl Luo,Ec Ma,Fc Ma,Jm Ma,Zp Mao,Xc Meng,Xh Mo,J Nie,Zd Nie,Nd Qi,Xr Qi,Cd Qian,Jf Qiu,Yk Que,G Rong,Yy Shao,Bw Shen,Dl Shen,H Shen,Xy Shen,Hy Sheng,F Shi,Hz Shi,Xf Song,Hs Sun,Lf Sun,Yz Sun,Sq Tang,X Tang,Gl Tong,Jz Wang, J Wang, L Wang,Ls Wang,M Wang,Pl Wang,P Wang,Sm Wang,Wf Wang,Yy Wang,Zy Wang,Cl Wei,N Wu,Dm Xi,Xm Xia,Xx Xie,Gf Xu,Y Xu,St Xue,Ml Yan,Wb Yan,Wg Yan,Cy Yang,Cm Yang,Ga Yang,Hx Yang,Xf Yang,Mh Ye,Sw Ye,Yx Ye,Cs Yu,Cx Yu,Gw Yu,Y Yuan,Y Zeng,By Zhang,Cc Zhang,Dh Zhang,Hl Zhang,J Zhang,Jw Zhang,Ls Zhang,L Zhang,Qj Zhang,Sq Zhang,Xy Zhang,Yy Zhang,Zp Zhang,Hy Zhang,P Zhang,Dx Zhao,Hw Zhao,Jw Zhao,Pp Zhao,Wr Zhao,Yb Zhao,Zg Zhao,Jp Zheng

HIGH ENERGY PHYSICS AND NUCLEAR PHYSICS-CHINESE EDITION（2002）

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Abstract

We report a measurement of the absolutely inclusive semileptonic branching fractions of D- and (D-0) over bar mesons, using a data sample of 22.3 pb(-1) collected with BES detector at BEPC e(+) e Collider at roots = 4.03 GeV and based on the method of "combinative D+ and D-0 single and double tags". The measured values of the branching fractions for D- --> e(-) X and (D-0) over bar --> e(-) X are ( 21.8 +/- 8.5 +/- 4.2)% and (8.9 +/- 3.0 +/- 1.6)%, respectively. The measured ratio of the branching fractions is BF(D- --> e(-) X)/BF (D0 --> e (-) X) -2.4 +/- 1.7 +/- 0.8.

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Key words

Beijing spectrometer, D meson, semileptonic decay, branching fraction

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