Indications of neutrino oscillation in a 250 km long-baseline experiment

被引：814

作者：

Ahn, MH ^{[1
]}

Aoki, S

Bhang, H

Boyd, S

Casper, D

Choi, JH

Fukuda, S

Fukuda, Y

Gajewski, W

Hara, T

Hasegawa, M

Hasegawa, T

Hayato, Y

Hill, J

Ichikawa, AK

Ikeda, A

Inagaki, T

Ishida, T

Ishii, T

Ishitsuka, M

Itow, Y

Iwashita, T

Jang, HI

Jang, JS

Jeon, EJ

Jung, CK

Kajita, T

Kameda, J

Kaneyuki, K

Kato, I

Kearns, E

Kibayashi, A

Kielczewska, D

Kobayashi, K

Kim, BJ

Kim, CO

Kim, JY

Kim, SB

Kobayashi, T

Kohama, M

Koshio, Y

Kropp, WR

Learned, JG

Lim, SH

Lim, IT

Maesaka, H

Martens, K

Maruyama, T

Matsuno, S

Mauger, C

机构：

[1] Seoul Natl Univ, Dept Phys, Seoul 151742, South Korea

[2] Kobe Univ, Kobe, Hyogo 6578501, Japan

[3] Univ Washington, Dept Phys, Seattle, WA 98195 USA

[4] Univ Calif Irvine, Dept Phys & Astron, Irvine, CA 92697 USA

[5] Chonnam Natl Univ, Dept Phys, Kwangju 500757, South Korea

[6] Univ Tokyo, Inst Cosm Ray Res, Chiba 2778582, Japan

[7] Kyoto Univ, Dept Phys, Kyoto 6068502, Japan

[8] Tohoku Univ, Res Ctr Neutrino Sci, Sendai, Miyagi 9808578, Japan

[9] KEK, Inst Particle & Nucl Studies, Tsukuba, Ibaraki 3050801, Japan

[10] SUNY Stony Brook, Dept Phys & Astron, Stony Brook, NY 11794 USA

[11] Okayama Univ, Dept Phys, Okayama 7008530, Japan

[12] Boston Univ, Dept Phys, Boston, MA 02215 USA

[13] Univ Hawaii, Dept Phys & Astron, Honolulu, HI 96822 USA

[14] Univ Warsaw, Inst Expt Phys, PL-00681 Warsaw, Poland

[15] Soltan Inst Nucl Studies, PL-00681 Warsaw, Poland

[16] Korea Univ, Dept Phys, Seoul 136701, South Korea

[17] Niigata Univ, Dept Phys, Niigata 9502181, Japan

[18] Dongshin Univ, Dept Phys, Naju 520714, South Korea

[19] MIT, Dept Phys, Cambridge, MA 02139 USA

[20] Sci Univ Tokyo, Dept Phys, Chiba 2780022, Japan

来源：

PHYSICAL REVIEW LETTERS | 2003年 / 90卷 / 04期

关键词：

CONSTRUCTION;

D O I：

10.1103/PhysRevLett.90.041801

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

The K2K experiment observes indications of neutrino oscillation: a reduction of nu(mu) flux together with a distortion of the energy spectrum. Fifty-six beam neutrino events are observed in Super-Kamiokande (SK), 250 km from the neutrino production point, with an expectation of 80.1(-5.4)(+6.2). Twenty-nine one ring mu-like events are used to reconstruct the neutrino energy spectrum, which is better matched to the expected spectrum with neutrino oscillation than without. The probability that the observed flux at SK is explained by statistical fluctuation without neutrino oscillation is less than 1%.

引用

页数：5

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