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Title: A new measurement of the rare decay eta -> pi^0 gamma gamma with the Crystal Ball/TAPS detectors at the Mainz Microtron

A new measurement of the rare, doubly radiative decay eta->pi^0 gamma gamma was conducted with the Crystal Ball and TAPS multiphoton spectrometers together with the photon tagging facility at the Mainz Microtron MAMI. New data on the dependence of the partial decay width, Gamma(eta->pi^0 gamma gamma), on the two-photon invariant mass squared, m^2(gamma gamma), as well as a new, more precise value for the decay width, Gamma(eta->pi^0 gamma gamma) = (0.33+/-0.03_tot) eV, are based on analysis of 1.2 x 10^3 eta->pi^0 gamma gamma decays from a total of 6 x 10^7 eta mesons produced in the gamma p -> eta p reaction. The present results for dGamma(eta->pi^0 gamma gamma)/dm^2(gamma gamma) are in good agreement with previous measurements and recent theoretical calculations for this dependence.
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Publication Date:
OSTI Identifier:
1164645
Report Number(s):
JLAB-THY-14-1884; arXiv:1405.4904; DOE/OR/23177-3244
Journal ID: ISSN 0556-2813; PRVCAN; ArticleNumber: 025206; Deutsche Forschungsgemeinschaft (SFB443, SFB/TR16, and SFB1044); DFG-RFBR (Grant No. 09-02-91330); Hadron Physics, Contract No. RII3-CT-2004-506078; UK Science and Technology Facilities Council Grant No. STFC 57071/1;
DOE Contract Number:
AC05-06OR23177
Resource Type:
Journal Article
Resource Relation:
Journal Name: Physical Review C. Nuclear physics; Journal Volume: 90; Journal Issue: 2
Publisher:
American Physical Society (APS)
Research Org:
Thomas Jefferson National Accelerator Facility, Newport News, VA (United States)
Sponsoring Org:
USDOE Office of Science (SC), Nuclear Physics (NP) (SC-26)
Country of Publication:
United States
Language:
English