Evidence for cp-violating asymmetries in b-0 ->pi(+)pi(-) decays and constraints on the ckm angle phi(2)
文献类型：期刊论文
| 作者 | Abe, K; Abe, K; Abe, N; Abe, T; Adachi, I; Aihara, H; Akai, K; Akatsu, M; Akemoto, M; Asano, Y |
| 刊名 | Physical review d
 |
| 出版日期 | 2003-07-01 |
| 卷号 | 68期号:1页码:15 |
| ISSN号 | 1550-7998 |
| DOI | 10.1103/physrevd.68.012001 |
| 通讯作者 | Abe, k() ; Abe, k() |
| 英文摘要 | We present an improved measurement of cp-violating asymmetries in b-0-->pi(+)pi(-) decays based on a 78 fb(-1) data sample collected at the y(4s) resonance with the belle detector at the kekb asymmetric-energy e(+)e(-) collider. we reconstruct one neutral b meson as a b-0-->pi(+)pi(-) cp eigenstate and identify the flavor of the accompanying b meson from inclusive properties of its decay products. we apply an unbinned maximum likelihood fit to the distribution of the time intervals between the two b meson decay points. the fit yields the cp-violating asymmetry amplitudes a(pipi) = +0.77 +/-0.27(stat) +/-0.08(syst) and s-pipi = -1.23+/-0.41(stat) (+0.08)(-0.07)(syst), where the statistical uncertainties are determined from the monte carlo pseudoexperiments. we obtain confidence intervals for cp-violating asymmetry parameters a(pipi) and s-pipi based on a frequentist approach. we rule out the cp-conserving case, a(pipi) = s-pipi = 0, at the 99.93% confidence level. we discuss how these results constrain the value of the cabibbo-kobayashi-maskawa (ckm) angle phi(2). |
| WOS关键词 | BELLE DETECTOR ; B-DECAYS ; PHYSICS |
| WOS研究方向 | Astronomy & Astrophysics ; Physics |
| WOS类目 | Astronomy & Astrophysics ; Physics, Particles & Fields |
| 语种 | 英语 |
| WOS记录号 | WOS:000184583700006 |
| 出版者 | AMER PHYSICAL SOC |
| URI标识 | http://www.irgrid.ac.cn/handle/1471x/2176367 |
| 专题 | 高能物理研究所 |
| 通讯作者 | Abe, K; Abe, K |
| 作者单位 | 1.High Energy Accelerator Res Org, Tsukuba, Ibaraki, Japan 2.Aomori Univ, Aomori, Japan 3.Budker Inst Nucl Phys, Novosibirsk 630090, Russia 4.Chuo Univ, Tokyo 112, Japan 5.Univ Cincinnati, Cincinnati, OH 45221 USA 6.Goethe Univ Frankfurt, D-6000 Frankfurt, Germany 7.Univ Hawaii, Honolulu, HI 96822 USA 8.Hiroshima Inst Technol, Hiroshima, Japan 9.Chinese Acad Sci, Inst High Energy Phys, Beijing, Peoples R China 10.Inst High Energy Phys, Vienna, Austria |
| 推荐引用方式 GB/T 7714 | Abe, K,Abe, K,Abe, N,et al. Evidence for cp-violating asymmetries in b-0 ->pi(+)pi(-) decays and constraints on the ckm angle phi(2)[J]. Physical review d,2003,68(1):15. |
| APA | Abe, K.,Abe, K.,Abe, N.,Abe, T.,Adachi, I.,...&Zontar, D.(2003).Evidence for cp-violating asymmetries in b-0 ->pi(+)pi(-) decays and constraints on the ckm angle phi(2).Physical review d,68(1),15. |
| MLA | Abe, K,et al."Evidence for cp-violating asymmetries in b-0 ->pi(+)pi(-) decays and constraints on the ckm angle phi(2)".Physical review d 68.1(2003):15. |
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