利用e+e-碰撞观测Bs→Ds(*)+Ds(*)-并确定Bs-Bsbar宽度差ΔΓs
高能物理 - 实验
2010-12-09 v2
摘要
我们利用Belle实验在Υ(5S)共振态上记录的23.6 fb⁻¹数据，首次观测到Bs→Ds(*)+Ds(*)-衰变。分支比测量结果为：B(B⁰s→D⁺sD⁻s) = (1.0⁺⁰·⁴₋₀·₃⁺⁰·³₋₀·₂)%，B(B⁰s→D*±sD∓s) = (2.8⁺⁰·⁸₋₀·⁷ ± 0.7)%，B(B⁰s→D*⁺sD*⁻s) = (3.1⁺¹·²₋₁·⁰ ± 0.8)%；总和为B(B⁰s→D(*)+sD(*)-s) = (6.9⁺¹·⁵₋₁·³ ± 1.9)%。假设Bs→Ds(*)+Ds(*)-衰变饱和了CP偶末态，该分支比决定了比值ΔΓs/cos(φ)，其中ΔΓs是Bs-Bsbar两个质量本征态之间的宽度差，φ是CP破坏弱相位。假设CP破坏可忽略不计，我们得到ΔΓs/Γs = 0.147⁺⁰·⁰³⁶₋₀·⁰³⁰(统计)⁺⁰·⁰⁴⁴₋₀·⁰⁴²(系统)，其中Γs是平均衰变宽度。
引用
@article{arxiv.1005.5177,
title = {Observation of Bs->Ds(*)+Ds(*)- using e+e- collisions and a determination of the Bs-Bsbar width difference \Delta\Gamma_s},
author = {S. Esen and A. J. Schwartz and I. Adachi and H. Aihara and K. Arinstein and V. Aulchenko and T. Aushev and T. Aziz and A. M. Bakich and V. Balagura and E. Barberio and A. Bay and M. Bischofberger and A. Bondar and A. Bozek and M. Bracko and T. E. Browder and M. -C. Chang and P. Chang and A. Chen and P. Chen and B. G. Cheon and C. -C. Chiang and Y. Choi and J. Dalseno and M. Dash and Z. Dolezal and Z. Drasal and A. Drutskoy and S. Eidelman and P. Goldenzweig and B. Golob and H. Ha and J. Haba and T. Hara and K. Hayasaka and T. Higuchi and Y. Hoshi and W. -S. Hou and Y. B. Hsiung and H. J. Hyun and T. Iijima and K. Inami and R. Itoh and M. Iwabuchi and N. J. Joshi and T. Julius and J. H. Kang and T. Kawasaki and H. Kichimi and H. J. Kim and H. O. Kim and J. H. Kim and Y. J. Kim and K. Kinoshita and B. R. Ko and P. Kodys and S. Korpar and P. Krizan and P. Krokovny and T. Kuhr and T. Kumita and Y. -J. Kwon and S. -H. Kyeong and J. S. Lange and S. -H. Lee and Y. Liu and D. Liventsev and R. Louvot and A. Matyja and S. McOnie and H. Miyata and R. Mizuk and G. B. Mohanty and E. Nakano and M. Nakao and H. Nakazawa and Z. Natkaniec and S. Neubauer and S. Nishida and O. Nitoh and T. Ohshima and S. Okuno and S. L. Olsen and P. Pakhlov and C. W. Park and H. Park and H. K. Park and M. Petric and L. E. Piilonen and M. Rohrken and S. Ryu and H. Sahoo and Y. Sakai and O. Schneider and C. Schwanda and K. Senyo and M. E. Sevior and M. Shapkin and C. P. Shen and J. -G. Shiu and P. Smerkol and E. Solovieva and M. Staric and K. Sumisawa and T. Sumiyoshi and Y. Teramoto and K. Trabelsi and S. Uehara and Y. Unno and S. Uno and P. Urquijo and Y. Usov and G. Varner and K. E. Varvell and K. Vervink and C. H. Wang and M. -Z. Wang and P. Wang and Y. Watanabe and R. Wedd and J. Wicht and E. Won and B. D. Yabsley and Y. Yamashita and Z. P. Zhang and V. Zhilich and A. Zupanc},
journal= {arXiv preprint arXiv:1005.5177},
year = {2010}
}
备注
13 pages, 2 figures, 2 tables. v2: text added for clarification, version published in Phys. Rev. Letters