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

Abstract

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:
Research Org.:
Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States)
Sponsoring Org.:
USDOE Office of Science (SC)
Contributing Org.:
KTeV Collaboration
OSTI Identifier:
1023526
Alternate Identifier(s):
OSTI ID: 1101140
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
Resource Type:
Journal Article: 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)
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; BOSONS; DECAY; PSEUDOSCALARS; experiment-HEP

Citation Formats

Abouzaid, E., Arenton, M., Barker, A. R., Bellantoni, L., Blucher, E., Bock, G. J., Cheu, E., Coleman, R., Corcoran, M. D., Cox, B., and Erwin, A. R.. Search for the rare decays KL→π⁰π⁰µ⁺µ⁻ and KL→π⁰π⁰X⁰→ π⁰π⁰µ⁺µ⁻. United States: N. p., 2011. Web. doi:10.1103/PhysRevLett.107.201803.
Abouzaid, E., Arenton, M., Barker, A. R., Bellantoni, L., Blucher, E., Bock, G. J., Cheu, E., Coleman, R., Corcoran, M. D., Cox, B., & Erwin, A. R.. Search for the rare decays KL→π⁰π⁰µ⁺µ⁻ and KL→π⁰π⁰X⁰→ π⁰π⁰µ⁺µ⁻. United States. doi:10.1103/PhysRevLett.107.201803.
Abouzaid, E., Arenton, M., Barker, A. R., Bellantoni, L., Blucher, E., Bock, G. J., Cheu, E., Coleman, R., Corcoran, M. D., Cox, B., and Erwin, A. R.. Wed . "Search for the rare decays KL→π⁰π⁰µ⁺µ⁻ and KL→π⁰π⁰X⁰→ π⁰π⁰µ⁺µ⁻". United States. doi:10.1103/PhysRevLett.107.201803. https://www.osti.gov/servlets/purl/1023526.
@article{osti_1023526,
title = {Search for the rare decays KL→π⁰π⁰µ⁺µ⁻ and KL→π⁰π⁰X⁰→ π⁰π⁰µ⁺µ⁻},
author = {Abouzaid, E. and Arenton, M. and Barker, A. R. and Bellantoni, L. and Blucher, E. and Bock, G. J. and Cheu, E. and Coleman, R. and Corcoran, M. D. and Cox, B. and Erwin, A. R.},
abstractNote = {The KTeV E799 experiment has conducted a search for the rare decays KL→π0π0µ+µ- and KL→π0π0X0→ π0π0µ+µ-, where the X0 is a possible new neutral boson that was reported by the HyperCP experiment with a mass of (214.3 ± 0.5) MeV/c2. We find no evidence for either decay. We obtain upper limits of Br(KL→π0π0X0 →π0π0µ+µ-) < 1.0 x 10-10 and Br(KL→ π0π0µ+µ-) < 9.2 x 10-11 at the 90% confidence level. This result rules out the pseudoscalar X0 as an explanation of the HyperCP result under the scenario that the d¯sX0 coupling is completely real.},
doi = {10.1103/PhysRevLett.107.201803},
journal = {Physical Review Letters},
issn = {0031-9007},
number = 20,
volume = 107,
place = {United States},
year = {2011},
month = {11}
}

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