Measurement of direct photon emission in the K(L) ---> pi+ pi- gamma decay mode

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In this paper the KTeV collaboration reports the analysis of 112.1 x 10{sup 3} candidate K{sub L} {yields} {pi}{sup +}{pi}{sup -}{gamma} 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 |{bar g}{sub M1}|(1 + a{sub 1}/a{sub 2}/(M{sub {rho}}{sup 2}-M{sub K}{sup 2}) + 2M{sub ... continued below

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Abouzaid, E.; /Chicago U., EFI; Arenton, M.; U., /Virginia; Barker, A.R.; U., /Colorado et al. April 1, 2006.

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In this paper the KTeV collaboration reports the analysis of 112.1 x 10{sup 3} candidate K{sub L} {yields} {pi}{sup +}{pi}{sup -}{gamma} 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 |{bar g}{sub M1}|(1 + a{sub 1}/a{sub 2}/(M{sub {rho}}{sup 2}-M{sub K}{sup 2}) + 2M{sub K}E{sub {gamma}}) have been measured to be |{bar g}{sub M1}| = 1.198 {+-} 0.035(stat) {+-} 0.086(syst) and a{sub 1}/a{sub 2} = =0.738 {+-} 0.007(stat) {+-} 0.018(syst) GeV{sup 2}/c{sup 2} respectively. An upper limit for the CP violating E1 direct emission amplitude |g{sub E1}| {le} 0.1 (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 E{sub {gamma}} {ge} 20 MeV.

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  • Journal Name: Phys.Rev.D74:032004,2006; Journal Volume: 74

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  • Report No.: FERMILAB-PUB-06-075-E
  • Grant Number: AC02-76CH03000
  • DOI: 10.1103/PhysRevD.74.032004 | External Link
  • Office of Scientific & Technical Information Report Number: 892285
  • Archival Resource Key: ark:/67531/metadc882788

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  • April 1, 2006

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  • Sept. 21, 2016, 2:29 a.m.

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  • Nov. 29, 2016, 7:34 p.m.

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Abouzaid, E.; /Chicago U., EFI; Arenton, M.; U., /Virginia; Barker, A.R.; U., /Colorado et al. Measurement of direct photon emission in the K(L) ---> pi+ pi- gamma decay mode, article, April 1, 2006; Batavia, Illinois. (digital.library.unt.edu/ark:/67531/metadc882788/: accessed December 16, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.