Measurement of direct photon emission in the KLπ+πγ decay mode

E. Abouzaid et al. (KTeV Collaboration)
Phys. Rev. D 74, 032004 – Published 8 August 2006; Erratum Phys. Rev. D 74, 039905 (2006)

Abstract

In this paper the KTeV collaboration reports the analysis of 112.1×103 candidate KLπ+πγ decays including a background of 671±41 events with the objective of determining the photon production mechanisms intrinsic to the decay process. These decays have been analyzed to extract the relative contributions of the CP violating bremsstrahlung process and the CP conserving M1 and CP violating E1 direct photon emission processes. The M1 direct photon emission amplitude and its associated vector form factor parameterized as |g˜M1|(1+a1/a2(Mρ2MK2)+2MKEγ) have been measured to be |g˜M1|=1.198±0.035(stat)±0.086(syst) and a1/a2=0.738±0.007(stat)±0.018(syst)GeV2/c2 respectively. An upper limit for the CP violating E1 direct emission amplitude |gE1|0.21 (90%CL) has been found. The overall ratio of direct photon emission (DE) to total photon emission including the bremsstrahlung process (IB) has been determined to be DE/(DE+IB)=0.689±0.021 for Eγ20MeV.

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  • Received 17 March 2006
  • Corrected 9 August 2006

DOI:https://doi.org/10.1103/PhysRevD.74.032004

©2006 American Physical Society

Corrections

9 August 2006

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Vol. 74, Iss. 3 — 1 August 2006

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