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Unitarity and K{sub L} {yields} {pi}{sup 0}{gamma}{gamma}

Abstract

We discuss the rare decay K{sub L}{yields}{pi}{sup 0}{gamma}{gamma}. Although the recently measured 2{gamma}-invariant-mass distribution is in quite good agreement with the lowest-order chiral perturbation theory prediction, there seems to be a discrepancy with the calculated branching ratio. We extend the previous computations to next-to-leading order, O(p{sup 6}). The two dominant mechanisms at this order are emphasized: the two-pion intermediate state and vector meson exchange. (authors).
Authors:
Cohen, A G; [1]  Ecker, G; [2]  Pich, A [3] 
  1. Boston Univ., MA (United States). Dept. of Physics
  2. Vienna Univ. (Austria). Inst. fuer Theoretische Physik
  3. European Organization for Nuclear Research, Geneva (Switzerland)
Publication Date:
Jan 01, 1993
Product Type:
Technical Report
Report Number:
CERN-TH-6782-93; BUHEP-93-03; UWThPh-1993-1.
Reference Number:
SCA: 662350; PA: AIX-25:012449; EDB-94:040894; ERA-19:010714; NTS-94:015706; SN: 94001153111
Resource Relation:
Other Information: PBD: Jan 1993
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; KAONS NEUTRAL LONG-LIVED; PARTICLE DECAY; BRANCHING RATIO; PERTURBATION THEORY; 662350; DECAYS OF MESONS
OSTI ID:
10127923
Research Organizations:
Boston Univ., MA (United States). Dept. of Physics; Vienna Univ. (Austria). Inst. fuer Theoretische Physik; European Organization for Nuclear Research, Geneva (Switzerland)
Country of Origin:
Austria
Language:
English
Other Identifying Numbers:
Other: ON: DE94614614; TRN: AT9300100012449
Availability:
OSTI; NTIS (US Sales Only); INIS
Submitting Site:
INIS
Size:
10 p.
Announcement Date:
Jul 04, 2005

Citation Formats

Cohen, A G, Ecker, G, and Pich, A. Unitarity and K{sub L} {yields} {pi}{sup 0}{gamma}{gamma}. Austria: N. p., 1993. Web.
Cohen, A G, Ecker, G, & Pich, A. Unitarity and K{sub L} {yields} {pi}{sup 0}{gamma}{gamma}. Austria.
Cohen, A G, Ecker, G, and Pich, A. 1993. "Unitarity and K{sub L} {yields} {pi}{sup 0}{gamma}{gamma}." Austria.
@misc{etde_10127923,
title = {Unitarity and K{sub L} {yields} {pi}{sup 0}{gamma}{gamma}}
author = {Cohen, A G, Ecker, G, and Pich, A}
abstractNote = {We discuss the rare decay K{sub L}{yields}{pi}{sup 0}{gamma}{gamma}. Although the recently measured 2{gamma}-invariant-mass distribution is in quite good agreement with the lowest-order chiral perturbation theory prediction, there seems to be a discrepancy with the calculated branching ratio. We extend the previous computations to next-to-leading order, O(p{sup 6}). The two dominant mechanisms at this order are emphasized: the two-pion intermediate state and vector meson exchange. (authors).}
place = {Austria}
year = {1993}
month = {Jan}
}