Determination of the parity of the neutral pion via its four-electron decay

被引：20

作者：

Abouzaid, E. ^{[4
,11
]}

Arenton, M. ^{[12
]}

Barker, A. R. ^{[5
]}

Bellantoni, L. ^{[7
]}

Blucher, E. ^{[4
]}

Bock, G. J. ^{[7
]}

Cheu, E. ^{[1
]}

Coleman, R. ^{[7
]}

Corcoran, M. D. ^{[9
]}

Cox, B. ^{[11
,12
]}

Erwin, A. R. ^{[13
]}

Escobar, C. O. ^{[3
]}

Glazov, A. ^{[4
]}

Golossanov, A. ^{[11
,12
]}

Gomes, R. A. ^{[3
]}

Gouffon, P. ^{[10
]}

Hsiung, Y. B. ^{[7
]}

Jensen, D. A. ^{[7
]}

Kessler, R. ^{[4
]}

Kotera, K. ^{[8
]}

Ledovskoy, A. ^{[11
,12
]}

McBride, P. L. ^{[7
]}

Monnier, E. ^{[4
,14
]}

Nguyen, H. ^{[7
]}

Niclasen, R. ^{[5
]}

Phillips, D. G., II ^{[11
,12
]}

Ramberg, E. J. ^{[7
]}

Ray, R. E. ^{[7
]}

Ronquest, M. ^{[11
,12
]}

Santos, E. ^{[10
]}

Slater, W. ^{[2
]}

Smith, D. ^{[11
,12
]}

Solomey, N. ^{[4
]}

Swallow, E. C. ^{[4
,6
]}

Toale, P. A. ^{[5
]}

Tschirhart, R. ^{[7
]}

Wah, Y. W. ^{[4
]}

Wang, J. ^{[1
]}

White, H. B. ^{[7
]}

Whitmore, J. ^{[7
]}

Wilking, M. J. ^{[5
]}

Winstein, B. ^{[4
]}

Winston, R. ^{[4
]}

Worcester, E. T. ^{[4
]}

Yamanaka, T. ^{[8
]}

Zimmerman, E. D. ^{[5
]}

Zukanovich, R. F. ^{[10
]}

机构：

[1] Univ Arizona, Tucson, AZ 85721 USA

[2] Univ Calif Los Angeles, Los Angeles, CA 90095 USA

[3] Univ Estadual Campinas, BR-13083970 Campinas, SP, Brazil

[4] Univ Chicago, Enrico Fermi Inst, Chicago, IL 60637 USA

[5] Univ Colorado, Boulder, CO 80309 USA

[6] Elmhurst Coll, Elmhurst, IL 60126 USA

[7] Fermilab Natl Accelerator Lab, Batavia, IL 60510 USA

[8] Osaka Univ, Osaka 5600043, Japan

[9] Rice Univ, Houston, TX 77005 USA

[10] Univ Sao Paulo, BR-05315970 Sao Paulo, Brazil

[11] Univ Virginia, Dept Phys, Charlottesville, VA 22901 USA

[12] Univ Virginia, Inst Nucl & Particle Phys, Charlottesville, VA 22901 USA

[13] Univ Wisconsin, Madison, WI 53706 USA

[14] CNRS, CPP Marseille, F-75700 Paris, France

来源：

PHYSICAL REVIEW LETTERS | 2008年 / 100卷 / 18期

关键词：

D O I：

10.1103/PhysRevLett.100.182001

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We present a new determination of the parity of the neutral pion via the double Dalitz decay pi(0) -> e(+)e(-)e(+)e(-). Our sample, which consists of 30511 candidate decays, was collected from K-L -> pi(0)pi(0)pi(0) decays in flight at the KTeV-E799 experiment at Fermi National Accelerator Laboratory. We confirm the negative pi(0) parity and place a limit on scalar contributions to the pi(0) -> e(+)e(-)e(+)e(-) decay amplitude of less than 3.3% assuming CPT conservation. The pi(0)gamma(*)gamma(*) form factor is well described by a momentum-dependent model with a slope parameter fit to the final state phase-space distribution. Additionally, we have measured the branching ratio of this mode to be B(pi(0) -> e(+)e(-)e(+)e(-)) = (3.26 +/- 0.18) x 10(-5).

引用

页数：5

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