Measurement of Inclusive Semileptonic Branching Fractions for D－→e－X and D0→e－X

BES Collaboration

Chinese Physics C> 2002, Vol. 26> Issue(6) : 547-556

Measurement of Inclusive Semileptonic Branching Fractions for D^－→e^－X and D⁰→e^－X

BES Collaboration

Institute of High Energy Physics, CAS, Beijing 100039, China

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Abstract：
We report a measurement of the absolutely inclusive semileptonic branching fractions of D^－ and D⁰ mesons, using a data sample of 22.3pb^－1 collected with BES detector at BEPC e⁺e^－ Collider at s=4.03GeV and based on the method of "combinative D⁺ and D⁰ single and double tags". The measured values of the branching fractions for D^－→e^－X and D⁰→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.

References

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. BAI Jin-Zhi et al. Nucl. Instr. and Methods,1994,A344:319 2. YE Ming-Han, ZHENG Zhi-Peng. Proceedings of the With International Symposium on Lepton and Photon Interactions Stanford, California, 1989. In:edited by M. Riordan. Singapore:World Scientific, 1990. 122;Eur. Phys. J., 1998, C3:1 3. RONG Gang, ZHAO Jia-Wei, LUO Chun-Hui et al. HEPNP, 2002, 26(3):207(in Chinese)(荣刚,赵家伟,罗春晖等.高能物理与核物理,2002,26(3):207) 4. ZHAO Jia-Wei. Test of QED with the Rections of e+e–→γγ(γ)at LEP2000 and Study of the Inclusive Semi-Leptonic Decays of D0 and D+ Mesons at BES Ph. D thesis University of Science and Technology of China, 2001(in Chinese)(赵家伟.在LEP2000上利用e+e–→γγ(γ)反应检验QED以及在北京谱仪上D介子单举半轻子衰变的研究.博士论文,中国科学技术大学,2001) 5. Aguilar Benitez M et al. ZPHY ,1987, C36:551 6. Baltrusaitis R M et al. Phys. Rev. Lett.,1985,54:1976 7. Schindler R H et al. Phys. Rev.,1981,D24:78 8. Bacino W et al. Phys. Rev. Lett.,1980,45:3299. Albrecht H et al. Phys. Lett.,1996,B374:249 10. Kubota Y et al. Phys. Rev.,1996,D54:299411. Particle Data Group, The Europea Physical Journal C ,2000,V15

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BES Collaboration. Measurement of Inclusive Semileptonic Branching Fractions for D^－→e^－X and D⁰→e^－X[J]. Chinese Physics C, 2002, 26(6): 547-556.

BES Collaboration. Measurement of Inclusive Semileptonic Branching Fractions for D^－→e^－X and D⁰→e^－X[J]. Chinese Physics C, 2002, 26(6): 547-556. shu

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Received: 2001-09-11
Revised: 1900-01-01

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沈阳化工大学材料科学与工程学院沈阳 110142

Measurement of Inclusive Semileptonic Branching Fractions for D^－→e^－X and D⁰→e^－X

BES Collaboration

Institute of High Energy Physics, CAS, Beijing 100039, China

Received Date: 2001-09-11
Accepted Date: 1900-01-01
Available Online: 2002-06-05

Abstract: We report a measurement of the absolutely inclusive semileptonic branching fractions of D^－ and D⁰ mesons, using a data sample of 22.3pb^－1 collected with BES detector at BEPC e⁺e^－ Collider at s=4.03GeV and based on the method of "combinative D⁺ and D⁰ single and double tags". The measured values of the branching fractions for D^－→e^－X and D⁰→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.