Measurement of Bd0-(B)over-bard0 mixing rate from the time evolution of dilepton events at the Υ(4S)

被引：115

作者：

Abe, K ^{[1
]}

Adachi, I

Ahn, BS

Aihara, H

Akatsu, M

Alimonti, G

Aoki, K

Asai, K

Asai, M

Asano, Y

Aso, T

Aulchenko, V

Aushev, T

Bakich, AM

Banas, E

Behari, S

Behera, PK

Beiline, D

Bondar, A

Bozek, A

Browder, TE

Casey, BCK

Chang, P

Chao, Y

Cheon, BG

Choi, SK

Choi, Y

Doi, Y

Dragic, J

Eidelman, S

Enari, Y

Enomoto, R

Everton, CW

Fang, F

Fujii, H

Fujita, Y

Fukunaga, C

Fukushima, M

Garmash, A

Gordon, A

Gotow, K

Guler, H

Guo, R

Haba, J

Haji, T

Hamasaki, H

Hanagaki, K

Handa, F

Hara, K

机构：

[1] KEK, High Energy Accelerator Res Org, Tsukuba, Ibaraki, Japan

[2] Aomori Univ, Aomori, Japan

[3] Budker Inst Nucl Phys, Novosibirsk 630090, Russia

[4] Chiba Univ, Chiba, Japan

[5] Chou Univ, Tokyo, Japan

[6] Univ Cincinnati, Cincinnati, OH USA

[7] Gyeongsang Natl Univ, Chinju, South Korea

[8] Univ Hawaii, Honolulu, HI 96822 USA

[9] Hiroshima Inst Technol, Hiroshima, Japan

[10] Univ Tokyo, Inst Cosm Ray Res, Tokyo, Japan

[11] Chinese Acad Sci, Inst High Energy Phys, Beijing, Peoples R China

[12] Inst Theoret & Expt Phys, Moscow 117259, Russia

[13] Kanagawa Univ, Yokohama, Kanagawa, Japan

[14] Korea Univ, Seoul 136701, South Korea

[15] H Niewodniczanski Inst Nucl Phys, PL-31342 Krakow, Poland

[16] Kyoto Univ, Kyoto, Japan

[17] Univ Melbourne, Parkville, Vic 3052, Australia

[18] Nagasaki Inst Appl Sci, Nagasaki, Japan

[19] Nagoya Univ, Nagoya, Aichi, Japan

[20] Nara Womens Univ, Nara 630, Japan

[21] Natl Kaohsiung Normal Univ, Kaohsiung, Taiwan

[22] Natl Lien Ho Inst Technol, Miao Li, Peoples R China

[23] Natl Taiwan Univ, Taipei 10764, Taiwan

[24] Nihon Dent Coll, Niigata, Japan

[25] Niigata Univ, Niigata, Japan

[26] Osaka City Univ, Osaka 558, Japan

[27] Osaka Univ, Osaka, Japan

[28] Panjab Univ, Chandigarh 160014, India

[29] Princeton Univ, Princeton, NJ 08544 USA

[30] Saga Univ, Saga 840, Japan

[31] Seoul Natl Univ, Seoul, South Korea

[32] Sungkyunkwan Univ, Suwon, South Korea

[33] Univ Sydney, Sydney, NSW 2006, Australia

[34] Toho Univ, Funabashi, Chiba 274, Japan

[35] Tohoku Gakuin Univ, Tagajo, Miyagi, Japan

[36] Tohoku Univ, Sendai, Miyagi 980, Japan

[37] Univ Tokyo, Tokyo, Japan

[38] Tokyo Inst Technol, Tokyo 152, Japan

[39] Tokyo Metropolitan Univ, Tokyo 158, Japan

[40] Tokyo Univ Agr & Technol, Tokyo, Japan

[41] Toyama Natl Coll Maritime Technol, Toyama, Japan

[42] Univ Tsukuba, Tsukuba, Ibaraki 305, Japan

[43] Utkal Univ, Bhubaneswar 751004, Orissa, India

[44] Virginia Polytech Inst & State Univ, Blacksburg, VA 24061 USA

[45] Yonsei Univ, Seoul 120749, South Korea

来源：

PHYSICAL REVIEW LETTERS | 2001年 / 86卷 / 15期

关键词：

D O I：

10.1103/PhysRevLett.86.3228

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We report a determination of the B-d(n)-N-n(d) mixing parameter Deltam(d) based on the time evolution of dilepton yields in Y (4S) decays. The measurement is based on a 5.9 fb(-1) data sample collected by the Belie detector at KEKB. The proper-time difference distributions for same-sign and opposite-sign dilepton events are simultaneously fitted to an expression containing Deltam(d) as a free parameter. Using both muons and electrons, we obtain Deltam(d) = 0.463 +/- 0.008 (stat) +/- 0.016 (syst) ps(-1). This is the first determination of Deltam(d) from time evolution measurements at the Y (4S). We also place limits on possible CPT violations.

引用

页码：3228 / 3232

页数：5

共 16 条

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