Search for lepton and baryon number violating τ- decays into (Λ)over-bar-π- and Λπ-

被引：17

作者：

Miyazaki, Y ^{[1
]}

Abe, K

Adachi, I

Aihara, H

Arinstein, K

Asano, Y

Aulchenko, V

Aushev, T

Bahinipati, S

Bakich, AM

Balagura, V

Barberio, E

Bedny, I

Bitenc, U

Bizjak, I

Blyth, S

Bondar, A

Bozek, A

Bracko, M

Brodzicka, J

Browder, TE

Chang, P

Chao, Y

Chen, A

Chen, KF

Chen, WT

Cheon, BG

Chistov, R

Choi, Y

Chuvikov, A

Cole, S

Dalseno, J

Danilov, M

Dash, M

Dong, L

Drutskoy, A

Eidelman, S

Enari, Y

Epifanov, D

Fratina, S

Gabyshev, N

Garmash, A

Gershon, T

Go, A

Gokhroo, G

Golob, B

Gorisek, A

Ha, HC

Hayasaka, K

机构：

[1] Nagoya Univ, Nagoya, Aichi, Japan

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

[3] Chiba Univ, Chiba, Japan

[4] Chonnam Natl Univ, Kwangju, South Korea

[5] Univ Cincinnati, Cincinnati, OH 45221 USA

[6] Univ Hawaii, Honolulu, HI 96822 USA

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

[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

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

[12] Jozef Stefan Inst, Ljubljana, Slovenia

[13] Kanagawa Univ, Yokohama, Kanagawa, Japan

[14] Korea Univ, Seoul 136701, South Korea

[15] Kyungpook Natl Univ, Taegu 702701, South Korea

[16] Ecole Polytech Fed Lausanne, Swiss Fed Inst Technol, CH-1015 Lausanne, Switzerland

[17] Univ Ljubljana, Ljubljana, Slovenia

[18] Univ Maribor, SLO-2000 Maribor, Slovenia

[19] Univ Melbourne, Melbourne, Vic, Australia

[20] Nara Womens Univ, Nara 630, Japan

[21] Natl Cent Univ, Chungli 32054, Taiwan

[22] Natl United Univ, Miaoli, Taiwan

[23] Natl Taiwan Univ, Dept Phys, Taipei 10764, Taiwan

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

[25] Nippon Dent Univ, Niigata, Japan

[26] Niigata Univ, Niigata, Japan

[27] Nova Gorica Polytech, Nova Gorica, Slovenia

[28] Osaka City Univ, Osaka 558, Japan

[29] Osaka Univ, Osaka, Japan

[30] Panjab Univ, Chandigarh 160014, India

[31] Peking Univ, Beijing 100871, Peoples R China

[32] Princeton Univ, Princeton, NJ 08544 USA

[33] Univ Sci & Technol China, Hefei 230026, Peoples R China

[34] Seoul Natl Univ, Seoul, South Korea

[35] Shinshu Univ, Nagano, Japan

[36] Sungkyunkwan Univ, Suwon, South Korea

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

[38] Tata Inst Fundamental Res, Bombay 400005, Maharashtra, India

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

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

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

[42] Univ Tokyo, Dept Phys, Tokyo, Japan

[43] Tokyo Inst Technol, Tokyo 152, Japan

[44] Tokyo Metropolitan Univ, Tokyo 158, Japan

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

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

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

[48] Yonsei Univ, Seoul 120749, South Korea

来源：

PHYSICS LETTERS B | 2006年 / 632卷 / 01期

关键词：

D O I：

10.1016/j.physletb.2005.10.024

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We have searched for tau lepton decays, tau(-) -> Lambda($) over bar pi(-) and tau -> Lambda pi(-), that simultaneously violate the conservation of the lepton (L) and baryon (B) number using a data sample of 154 fb(-1) collected with the Belle detector at the KEKB e(+)e(-) asymmetric-energy collider. No evidence for a signal was found in either of the decay modes and we set the following upper limits for the branching fractions: B(tau(-) -> Lambda($) over bar pi(-)) < 1.4 x 10(-7) and B(tau(-) -> Lambda($) over bar pi(-)) < 0.72 x 10(-7) at the 90% confidence level. This is the first search ever performed for these modes. (c) 2005 Elsevier B.V. All rights reserved.

引用

页码：51 / 57

页数：7

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