在中性B介子系统中观测到较大的CP破坏。
Observation of large CP violation in the neutral B meson system.
作者信息
Abe K, Abe K, Abe R, Adachi I, Ahn B S, Aihara H, Akatsu M, Alimonti G, Asai K, Asai M, Asano Y, Aso T, Aulchenko V, Aushev T, Bakich A M, Banas E, Behari S, Behera P K, Beiline D, Bondar A, Bozek A, Browder T E, Casey B C, Chang P, Chao Y, Chen K F, Cheon B G, Chistov R, Choi S K, Choi Y, Dong L Y, Dragic J, Drutskoy A, Eidelman S, Eiges V, Enari Y, Enomoto R, Everton C W, Fang F, Fujii H, Fukunaga C, Fukushima M, Gabyshev N, Garmash A, Gershon T J, Gordon A, Gotow K, Guler H, Guo R, Haba J, Hamasaki H, Hanagaki K, Handa F, Hara K, Hara T, Hastings N C, Hayashii H, Hazumi M, Heenan E M, Higasino Y, Higuchi I, Higuchi T, Hirai T, Hirano H, Hojo T, Hokuue T, Hoshi Y, Hoshina K, Hou S R, Hou W S, Hsu S C, Huang H C, Igarashi Y, Iijima T, Ikeda H, Ikeda K, Inami K, Ishikawa A, Ishino H, Itoh R, Iwai G, Iwasaki H, Iwasaki Y, Jackson D J, Jalocha P, Jang H K, Jones M, Kagan R, Kakuno H, Kaneko J, Kang J H, Kang J S, Kapusta P, Katayama N, Kawai H, Kawai H, Kawakami Y, Kawamura N, Kawasaki T, Kichimi H, Kim D W, Kim H, Kim H J, Kim H, Kim S K, Kim T H, Kinoshita K, Kobayashi S, Koishi S, Konishi H, Korotushenko K, Krokovny P, Kulasiri R, Kumar S, Kuniya T, Kurihara E, Kuzmin A, Kwon Y J, Lange J S, Leder G, Lee M H, Lee S H, Leonidopoulos C, Lin Y S, Liventsev D, Lu R S, MacNaughton J, Marlow D, Matsubara T, Matsui S, Matsumoto S, Matsumoto T, Mikami Y, Misono K, Miyabayashi K, Miyake H, Miyata H, Moffitt L C, Moloney G R, Moorhead G F, Mori S, Mori T, Murakami A, Nagamine T, Nagasaka Y, Nagashima Y, Nakadaira T, Nakamura T, Nakano E, Nakao M, Nakazawa H, Nam J W, Natkaniec Z, Neichi K, Nishida S, Nitoh O, Noguchi S, Nozaki T, Ogawa S, Ohshima T, Ohshima Y, Okabe T, Okazaki T, Okuno S, Olsen S L, Ozaki H, Pakhlov P, Palka H, Park C S, Park C W, Park H, Peak L S, Peters M, Piilonen L E, Prebys E, Rodriguez J L, Root N, Rozanska M, Rybicki K, Ryuko J, Sagawa H, Sakai Y, Sakamoto H, Satapathy M, Satpathy A, Schrenk S, Semenov S, Senyo K, Settai Y, Sevior M E, Shibuya H, Shwartz B, Sidorov A, Stanic S, Sugi A, Sugiyama A, Sumisawa K, Sumiyoshi T, Suzuki J, Suzuki K, Suzuki S, Suzuki S Y, Swain S K, Tajima H, Takahashi T, Takasaki F, Takita M, Tamai K, Tamura N, Tanaka J, Tanaka M, Taylor G N, Teramoto Y, Tomoto M, Tomura T, Tovey S N, Trabelsi K, Tsuboyama T, Tsukamoto T, Uehara S, Ueno K, Unno Y, Uno S, Ushiroda Y, Vahsen S E, Varvell K E, Wang C C, Wang C H, Wang J G, Wang M Z, Watanabe Y, Won E, Yabsley B D, Yamada Y, Yamaga M, Yamaguchi A, Yamamoto H, Yamanaka T, Yamashita Y, Yamauchi M, Yanaka S, Yashima J, Yokoyama M, Yoshida K, Yusa Y, Yuta H, Zhang C C, Zhang J, Zhao H W, Zheng Y, Zhilich V, Zontar D
机构信息
High Energy Accelerator Research Organization (KEK), Tsukuba.
出版信息
Phys Rev Lett. 2001 Aug 27;87(9):091802. doi: 10.1103/PhysRevLett.87.091802. Epub 2001 Aug 14.
We present a measurement of the standard model CP violation parameter sin2 phi(1) based on a 29.1 fb(-1) data sample collected at the Upsilon(4S) resonance with the Belle detector at the KEKB asymmetric-energy e(+)e(-) collider. One neutral B meson is fully reconstructed as a J/psi K(S), psi(2S)K(S), chi(c1)K(S), eta(c)K(S), J/psi K(L), or J/psi K(*0) decay and the flavor of the accompanying B meson is identified from its decay products. From the asymmetry in the distribution of the time intervals between the two B meson decay points, we determine sin2 phi(1) = 0.99+/-0.14(stat)+/-0.06(syst). We conclude that we have observed CP violation in the neutral B meson system.
我们基于在KEKB非对称能量正负电子对撞机上使用 Belle 探测器在 Υ(4S) 共振处收集的 29.1 fb⁻¹ 数据样本，给出了标准模型 CP 破坏参数 sin2φ₁ 的测量结果。一个中性 B 介子被完全重建为 J/ψKₛ、ψ(2S)Kₛ、χc₁Kₛ、ηcKₛ、J/ψKₗ 或 J/ψK⁺⁰ 衰变，并且伴随的 B 介子的味道从其衰变产物中识别出来。从两个 B 介子衰变点之间时间间隔分布的不对称性，我们确定 sin2φ₁ = 0.99±0.14(统计)±0.06(系统)。我们得出结论，我们在中性 B 介子系统中观测到了 CP 破坏。
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