寻找Υ(1S)的不可见衰变。

Search for invisible decay of the Upsilon(1S).

作者信息

Tajima O, Hayashii H, Hazumi M, Inami K, Iwasaki Y, Uehara S, Abe K, Adachi I, Aihara H, Anipko D, Aulchenko V, Bakich A M, Barberio E, Bedny I, Belous K, Bitenc U, Bizjak I, Bondar A, Bozek A, Bracko M, Browder T E, Chang M-C, Chen A, Chen K-F, Chen W T, Cheon B G, Chistov R, Choi Y, Choi Y K, Cole S, Dalseno J, Danilov M, Dash M, Drutskoy A, Eidelman S, Fratina S, Gabyshev N, Gershon T, Go A, Gokhroo G, Ha H, Haba J, Hayasaka K, Heffernan D, Hokuue T, Hoshi Y, Hou S, Hou W-S, Iijima T, Ikado K, Ishikawa A, Ishino H, Itoh R, Iwasaki M, Kang J H, Kataoka S U, Katayama N, Kawai H, Kawasaki T, Khan H R, Kichimi H, Kim H J, Kim S K, Kim Y J, Kinoshita K, Korpar S, Krizan P, Krokovny P, Kumar R, Kuo C C, Kuzmin A, Kwon Y-J, Lange J S, Lee J, Lee M J, Lesiak T, Limosani A, Lin S-W, Liventsev D, Majumder G, Mandl F, Matsumoto T, McOnie S, Miyabayashi K, Miyake H, Miyata H, Miyazaki Y, Mizuk R, Mori T, Mueller J, Nakamura I, Nakano E, Nakao M, Nakazawa H, Natkaniec Z, Nishida S, Nitoh O, Noguchi S, Nozaki T, Ogawa S, Ohshima T, Okuno S, Olsen S L, Onuki Y, Ozaki H, Pakhlov P, Pakhlova G, Park H, Pestotnik R, Piilonen L E, Sahoo H, Sakai Y, Satoyama N, Schietinger T, Schneider O, Schümann J, Schwartz A J, Seidl R, Senyo K, Sevior M E, Shapkin M, Shibuya H, Shwartz B, Singh J B, Sokolov A, Somov A, Soni N, Stanic S, Staric M, Stoeck H, Sumisawa K, Sumiyoshi T, Suzuki S, Takasaki F, Tamai K, Tamura N, Tanaka M, Taylor G N, Teramoto Y, Tian X C, Tikhomirov I, Trabelsi K, Tsuboyama T, Tsukamoto T, Uglov T, Uno S, Urquijo P, Ushiroda Y, Usov Y, Varner G, Villa S, Wang C C, Wang C H, Wang M-Z, Watanabe Y, Wedd R, Wicht J, Won E, Xie Q L, Yabsley B D, Yamaguchi A, Yamashita Y, Yamauchi M, Zhang Z P, Zhilich V, Zupanc A

机构信息

High Energy Accelerator Research Organization (KEK), Tsukuba.

出版信息

Phys Rev Lett. 2007 Mar 30;98(13):132001. doi: 10.1103/PhysRevLett.98.132001. Epub 2007 Mar 27.

DOI:10.1103/PhysRevLett.98.132001

PMID:17501190

Abstract

We report results of a search for the invisible decay of the Upsilon(1S) via the Upsilon(3S)-->pi+ pi- Upsilon(1S) transition using a data sample of 2.9 fb-1 at the Upsilon(3S) resonance. The data were collected with the Belle detector at the KEKB asymmetric-energy e+ e- collider. No signal is found, and an upper limit for the branching fraction at the 90% confidence level is determined to be B(Upsilon(1S)-->invisible)<2.5 x 10(-3).

摘要

我们报告了在Upsilon(3S)共振处使用2.9 fb-1的数据样本，通过Upsilon(3S)→π+π-Upsilon(1S)跃迁寻找Upsilon(1S)的不可见衰变的结果。数据是在KEKB非对称能量e+e-对撞机上用Belle探测器收集的。未发现信号，在90%置信水平下确定分支比的上限为B(Upsilon(1S)→不可见)<2.5×10(-3)。