对B0→π0π0的观测
Observation of B0-->pi0pi0.
作者信息
Chao Y, Chang P, Abe K, Abe K, Aihara H, Akai K, Akatsu M, Akemoto M, Asano Y, Aushev T, Bahinipati S, Bakich A M, Bay A, Bedny I, Bitenc U, Bizjak I, Bondar A, Bozek A, Bracko M, Brodzicka J, Browder T E, Chen A, Chen K-F, Chen W T, Cheon B G, Chistov R, Choi S-K, Choi Y, Chuvikov A, Dalseno J, Danilov M, Dash M, Dragic J, Drutskoy A, Eidelman S, Eiges V, Enari Y, Fang F, Flanagan J, Fratina S, Furukawa K, Gabyshev N, Garmash A, Gershon T, Gokhroo G, Golob B, Haba J, Hastings N C, Hayasaka K, Hayashii H, Hazumi M, Hinz L, Hokuue T, Hoshi Y, Hou S, Hou W-S, Hsiung Y B, Iijima T, Ikeda H, Imoto A, Inami K, Ishikawa A, Itoh R, Iwasaki M, Iwasaki Y, Kang J H, Kang J S, Kapusta P, Kataoka S U, Katayama N, Kawai H, Kawasaki T, Khan H R, Kichimi H, Kikutani E, Kim H J, Kim J H, Kim S K, Kinoshita K, Koiso H, Korpar S, Krokovny P, Kumar S, Kuo C C, Kuzmin A, Kwon Y-J, Lange J S, Leder G, Lee S E, Lee S H, Lee Y-J, Lesiak T, Li J, Limosani A, Lin S-W, MacNaughton J, Majumder G, Mandl F, Matsumoto T, Michizono S, Mimashi T, Mitaroff W, Miyabayashi K, Miyake H, Miyata H, Mizuk R, Mohapatra D, Mori T, Nagamine T, Nagasaka Y, Nakadaira T, Nakamura T T, Nakano E, Nakao M, Natkaniec Z, Nishida S, Nitoh O, Noguchi S, Nozaki T, Ogawa S, Ogawa Y, Ohmi K, Ohshima T, Ohuchi N, Oide K, Okabe T, Okuno S, Olsen S L, Ostrowicz W, Ozaki H, Park C W, Park H, Parslow N, Peak L S, Piilonen L E, Sagawa H, Sakai Y, Sato N, Schietinger T, Schneider O, Schümann J, Schwartz A J, Senyo K, Sevior M E, Shidara T, Shwartz B, Sidorov V, Somov A, Soni N, Stamen R, Stanic S, Staric M, Sugahara R, Sumisawa K, Sumiyoshi T, Suzuki S, Tajima O, Takasaki F, Tamai K, Tamura N, Tanaka M, Tawada M, Teramoto Y, Tian X C, Tsukamoto T, Uehara S, Uglov T, Ueno K, Unno Y, Uno S, Varner G, Varvell K E, Villa S, Wang C C, Wang C H, Wang M-Z, Watanabe Y, Yabsley B D, Yamaguchi A, Yamamoto H, Yamashita Y, Yamauchi M, Yang Heyoung, Ying J, Yokoyama K, Yoshida M, Yoshida M, Zang S L, Zhang C C, Zhang J, Zhang L M, Zhang Z P, Zhilich V, Zontar D, Zürcher D
机构信息
Department of Physics, National Taiwan University, Taipei.
出版信息
Phys Rev Lett. 2005 May 13;94(18):181803. doi: 10.1103/PhysRevLett.94.181803. Epub 2005 May 12.
We report the observation of the decay B0-->pi(0)pi(0), using a 253 fb(-1) data sample collected at the Upsilon(4S) resonance with the Belle detector at the KEKB e(+)e(-) collider. The measured branching fraction is B(B0-->pi(0)pi(0))=(2.3(+0.4+0.2)(-0.5-0.3))x10(-6), with a significance of 5.8 standard deviations including systematic uncertainties. We also make a measurement of the direct CP violating asymmetry in this mode.
我们报告了使用在KEKB正负电子对撞机上的Belle探测器，在Upsilon(4S)共振处收集的253 fb⁻¹数据样本对衰变B⁰→π⁰π⁰的观测。测量得到的分支比为B(B⁰→π⁰π⁰) = (2.3(+0.4 + 0.2)(-0.5 - 0.3))×10⁻⁶，包括系统不确定性在内的显著性为5.8个标准差。我们还对该模式下的直接CP破坏不对称性进行了测量。
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