New measurement of the rare decay K+ → π+μ+μ-

被引：44

作者：

Ma, H

Appel, R

Atoyan, GS

Bassalleck, B

Bergman, DR

Cheung, N

Dhawan, S

Do, H

Egger, J

Eilerts, S

Fischer, H

Herold, W

Issakov, VV

Kaspar, H

Kraus, DE

Lazarus, DM

Lichard, P

Lowe, J

Lozano, J

Majid, W

Menzel, W

Pislak, S

Poblaguev, AA

Rehak, P

Sher, A

Thompson, JA

Truöl, P

Zeller, ME

机构：

[1] Yale Univ, Dept Phys, New Haven, CT 06511 USA

[2] Brookhaven Natl Lab, Upton, NY 11973 USA

[3] Univ New Mexico, Dept Phys & Astron, Albuquerque, NM 87131 USA

[4] Univ Pittsburgh, Dept Phys & Astron, Pittsburgh, PA 15260 USA

[5] Russian Acad Sci, Inst Nucl Res, Moscow 117312, Russia

[6] Paul Scherrer Inst, CH-5232 Villigen, Switzerland

[7] Univ Basel, Inst Phys, CH-4046 Basel, Switzerland

[8] Univ Zurich, Inst Phys, CH-8057 Zurich, Switzerland

来源：

PHYSICAL REVIEW LETTERS | 2000年 / 84卷 / 12期

关键词：

D O I：

10.1103/PhysRevLett.84.2580

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

More than 400 K+ --> pi(+) mu(+) mu(-) events were observed in a rare K+ decay experiment at the Brookhaven Alternating Gradient Synchrotron. Normalized to the K+ --> pi(+) pi(+) pi(-) decay, the branching ratio is determined to be [9.22 +/- 0.60(stat) +/- 0.49(syst)] X 10(-8). This branching ratio and the mu mu mass spectrum is in very good agreement with the measurement of the K+ --> pi(+) e(+) e(-) decay, but deviates significantly from the previous measurement.

引用

页码：2580 / 2583

页数：4

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