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Title: Search for the rare decays K L→π⁰π⁰µ⁺µ⁻ and K L→π⁰π⁰X⁰→ π⁰π⁰µ⁺µ⁻

The KTeV E799 experiment has conducted a search for the rare decays K L→π 0π 0µ +µ - and K L→π 0π 0X 0→ π 0π 0µ +µ -, where the X 0 is a possible new neutral boson that was reported by the HyperCP experiment with a mass of (214.3 ± 0.5) MeV/c 2. We find no evidence for either decay. We obtain upper limits of Br(K L→π 0π 0X 0 →π 0π 0µ +µ -) < 1.0 x 10 -10 and Br(K L→ π 0π 0µ +µ -) < 9.2 x 10 -11 at the 90% confidence level. This result rules out the pseudoscalar X 0 as an explanation of the HyperCP result under the scenario that the d¯sX 0 coupling is completely real.
Authors:
 [1] ;  [2] ;  [3] ;  [4] ;  [1] ;  [4] ;  [5] ;  [4] ;  [6] ;  [2] ;  [7]
  1. Enrico Fermi Institute, Univ. of Chicago, IL (United States)
  2. Univ. of Virginia, Charlottesville, VA (United States)
  3. Univ. of Colorado, Boulder, CO (United States)
  4. Fermi National Accelerator Laboratory (FNAL), Batavia, IL (United States)
  5. Univ. of Arizona, Tucson, AZ (United States)
  6. Rice Univ., Houston, TX (United States)
  7. Univ. of Wisconsin, Madison, WI (United States)
Publication Date:
Report Number(s):
FERMILAB-PUB-11-224-PPD
Journal ID: ISSN 0031-9007; arXiv eprint number arXiv:1105.4800; TRN: US1104577
Grant/Contract Number:
AC02-07CH11359
Type:
Accepted Manuscript
Journal Name:
Physical Review Letters
Additional Journal Information:
Journal Volume: 107; Journal Issue: 20; Journal ID: ISSN 0031-9007
Publisher:
American Physical Society (APS)
Research Org:
Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States)
Sponsoring Org:
USDOE Office of Science (SC)
Contributing Orgs:
KTeV Collaboration
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; BOSONS; DECAY; PSEUDOSCALARS; experiment-HEP
OSTI Identifier:
1023526
Alternate Identifier(s):
OSTI ID: 1101140