New measurement of the properties of the rare decay K+→π+e+e-

被引：74

作者：

Appel, R ^{[1
]}

Atoyan, GS

Bassalleck, B

Bergman, DR

Brown, DN

Cheung, N

Dhawan, S

Do, H

Egger, J

Eilerts, S

Felder, C

Fischer, H

Gach, M

Herold, W

Issakov, VV

Kaspar, H

Kraus, DE

Lazarus, DM

Leipuner, L

Lichard, P

Lowe, J

Lozano, J

Ma, H

Majid, W

Menzel, W

Pislak, S

Poblaguev, AA

Postoev, VE

Proskurjakov, AL

Rehak, P

Robmann, P

Sher, A

Thomas, TL

Poblaguev, AA

Postoev, VE

Proskurjakov, AL

Rehak, P

Robmann, P

Sher, A

Thomas, TL

Thompson, JA

Truöl, P

Weyer, H

Zeller, ME

机构：

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

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

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

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

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

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

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

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

来源：

PHYSICAL REVIEW LETTERS | 1999年 / 83卷 / 22期

关键词：

D O I：

10.1103/PhysRevLett.83.4482

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

A low-background sample of 10 300 events has been collected for the decay mode K+ --> pi(+)e(+)e(-) experiment E865 at the Brookhaven Alternating Gradient Synchrotron. The branching ratio is measured to be [2.94 +/- 0.05(stat) +/- 0.13(syst) +/- 0.05(model)] x 10(-7), the vector nature of this decay is firmly established, and the decay form factor f(z) = f(0)(1 + delta z)(z = M-ee(2)/m(K)(2)) is determined to have delta = 2.14 +/- 0.13 +/- 0.15, The experiment is described and results discussed in the context of chiral perturbation theory.

引用

页码：4482 / 4485

页数：4

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