MEASUREMENT OF THE PI-0 ELECTROMAGNETIC TRANSITION FORM-FACTOR

被引：36

作者：

DREES, RM

WALTHAM, C

BERNASCONI, T

EGLI, S

HERMES, E

MUHEIM, F

NIEBUHR, C

PRUYS, H

VANDERSCHAAF, A

BERTL, W

GROSSMANNHANDSCHIN, M

LORDONG, N

VERMEULEN, D

WALTER, HK

EICHLER, R

FELAWKA, L

KOZLOWSKI, T

PLAYFER, S

MARTINO, J

机构：

[1] UNIV ZURICH,INST PHYS,CH-8001 ZURICH,SWITZERLAND

[2] PAUL SCHERRER INST,CH-5232 VILLIGEN,SWITZERLAND

[3] ETH,INST MITTELENERGIEPHYS,CH-5232 VILLIGEN,SWITZERLAND

[4] CENS,DEPT PHYS NUCL & HAUTES ENERGIES,F-91191 GIF SUR YVETTE,FRANCE

[5] INST NUCL STUDIES,PL-05400 OTWOCK,POLAND

来源：

PHYSICAL REVIEW D | 1992年 / 45卷 / 05期

关键词：

D O I：

10.1103/PhysRevD.45.1439

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We present the result of a measurement of the pi(0) electromagnetic transition form factor in the time-like region of momentum transfer. From a data sample of 54 000 pi(0) --> e+e-gamma-decays, observed in the SINDRUM I magnetic spectrometer at the Paul Scherrer Institute (Switzerland), we measure a value of the form factor slope a = 0.025 +/- 0.014 (stat) +/- 0.026 (syst). This value is consistent with both the results of the recent measurement by CELLO (DESY) in the spacelike region, and with the vector-meson-dominance prediction of a almost-equal-to 0.03.

引用

页码：1439 / 1447

页数：9

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