کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
9861040 | 1528980 | 2005 | 13 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Measurement of |Vub| near the endpoint of the electron momentum spectrum from semileptonic B-meson decays
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موضوعات مرتبط
مهندسی و علوم پایه
فیزیک و نجوم
فیزیک هسته ای و انرژی بالا
پیش نمایش صفحه اول مقاله
![عکس صفحه اول مقاله: Measurement of |Vub| near the endpoint of the electron momentum spectrum from semileptonic B-meson decays Measurement of |Vub| near the endpoint of the electron momentum spectrum from semileptonic B-meson decays](/preview/png/9861040.png)
چکیده انگلیسی
We report measurements of partial branching fractions of inclusive charmless semileptonic B-meson decays at the endpoint of the electron momentum spectrum. The measurements are made in six overlapping momentum intervals that have lower bounds ranging from 1.9 to 2.4 GeV/c and a common upper bound of 2.6 GeV/c, as measured in the centre of mass frame. The results are based on a sample of 29 million BB¯ pairs, accumulated by the Belle detector at the KEKB asymmetric e+eâ collider operating on the Ï(4S) resonance. In the momentum interval ranging from 1.9 to 2.6 GeV/c we measure the partial branching fraction ÎB(BâXueνe)=(8.47±0.37±1.53)Ã10â4, where the first error is statistical and the second is systematic. A prediction of the partial rate R=(21.69±3.62â1.98+2.18)|Vub|2psâ1 in this momentum interval based on theory is calculated with input HQET parameters that have been derived from Belle's measurement of the BâXsγ photon energy spectrum, where the first error is due to the uncertainty on HQET parameters and the second error is from theory. Using both ÎB(BâXueνe) and R we find |Vub|=(5.08±0.47±0.42â0.23+0.26)Ã10â3, where the first error is from the partial branching fraction, and the second and third errors are from uncertainties in R.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Physics Letters B - Volume 621, Issues 1â2, 11 August 2005, Pages 28-40
Journal: Physics Letters B - Volume 621, Issues 1â2, 11 August 2005, Pages 28-40
نویسندگان
Belle Collaboration Belle Collaboration, A. Limosani, K. Abe, K. Abe, I. Adachi, H. Aihara, Y. Asano, T. Aushev, S. Bahinipati, A.M. Bakich, E. Barberio, U. Bitenc, I. Bizjak, S. Blyth, A. Bondar, A. Bozek, M. BraÄko, J. Brodzicka, D. Žontar,