Measurement of direct photon emission in the KL→π+π-γ decay mode

E. Abouzaid, M. Arenton, A. R. Barker, L. Bellantoni, A. Bellavance, E. Blucher, G. J. Bock, Elliott C Cheu, R. Coleman, M. D. Corcoran, G. Corti, B. Cox, A. R. Erwin, C. O. Escobar, A. Glazov, A. Golossanov, R. A. Gomes, P. Gouffon, K. Hanagaki, Y. B. HsiungH. Huang, D. A. Jensen, R. Kessler, K. Kotera, A. Ledovskoy, P. L. McBride, E. Monnier, K. S. Nelson, H. Nguyen, D. G. Phillips, H. Ping, E. J. Ramberg, R. E. Ray, M. Ronquest, E. Santos, J. Shields, W. Slater, D. Smith, N. Solomey, E. C. Swallow, P. A. Toale, R. Tschirhart, C. Velissaris, Y. W. Wah, J. Wang, H. B. White, J. Whitmore, M. Wilking, B. Winstein, R. Winston, E. T. Worchester, M. Worchester, T. Yamanaka, E. D. Zimmerman, R. F. Zukanovich

Research output: Contribution to journalArticle

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Abstract

In this paper the KTeV collaboration reports the analysis of 112.1×103 candidate KL→π+π-γ 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(Mρ2-MK2) +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 Eγ≥20MeV.

Original languageEnglish (US)
Article number032004
JournalPhysical Review D - Particles, Fields, Gravitation and Cosmology
Volume74
Issue number3
DOIs
StatePublished - 2006

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Photon
Decay
photons
decay
bremsstrahlung
Form Factors
form factors

ASJC Scopus subject areas

  • Physics and Astronomy(all)
  • Nuclear and High Energy Physics
  • Mathematical Physics
  • Physics and Astronomy (miscellaneous)

Cite this

Abouzaid, E., Arenton, M., Barker, A. R., Bellantoni, L., Bellavance, A., Blucher, E., ... Zukanovich, R. F. (2006). Measurement of direct photon emission in the KL→π+π-γ decay mode. Physical Review D - Particles, Fields, Gravitation and Cosmology, 74(3), [032004]. https://doi.org/10.1103/PhysRevD.74.032004

Measurement of direct photon emission in the KL→π+π-γ decay mode. / Abouzaid, E.; Arenton, M.; Barker, A. R.; Bellantoni, L.; Bellavance, A.; Blucher, E.; Bock, G. J.; Cheu, Elliott C; Coleman, R.; Corcoran, M. D.; Corti, G.; Cox, B.; Erwin, A. R.; Escobar, C. O.; Glazov, A.; Golossanov, A.; Gomes, R. A.; Gouffon, P.; Hanagaki, K.; Hsiung, Y. B.; Huang, H.; Jensen, D. A.; Kessler, R.; Kotera, K.; Ledovskoy, A.; McBride, P. L.; Monnier, E.; Nelson, K. S.; Nguyen, H.; Phillips, D. G.; Ping, H.; Ramberg, E. J.; Ray, R. E.; Ronquest, M.; Santos, E.; Shields, J.; Slater, W.; Smith, D.; Solomey, N.; Swallow, E. C.; Toale, P. A.; Tschirhart, R.; Velissaris, C.; Wah, Y. W.; Wang, J.; White, H. B.; Whitmore, J.; Wilking, M.; Winstein, B.; Winston, R.; Worchester, E. T.; Worchester, M.; Yamanaka, T.; Zimmerman, E. D.; Zukanovich, R. F.

In: Physical Review D - Particles, Fields, Gravitation and Cosmology, Vol. 74, No. 3, 032004, 2006.

Research output: Contribution to journalArticle

Abouzaid, E, Arenton, M, Barker, AR, Bellantoni, L, Bellavance, A, Blucher, E, Bock, GJ, Cheu, EC, Coleman, R, Corcoran, MD, Corti, G, Cox, B, Erwin, AR, Escobar, CO, Glazov, A, Golossanov, A, Gomes, RA, Gouffon, P, Hanagaki, K, Hsiung, YB, Huang, H, Jensen, DA, Kessler, R, Kotera, K, Ledovskoy, A, McBride, PL, Monnier, E, Nelson, KS, Nguyen, H, Phillips, DG, Ping, H, Ramberg, EJ, Ray, RE, Ronquest, M, Santos, E, Shields, J, Slater, W, Smith, D, Solomey, N, Swallow, EC, Toale, PA, Tschirhart, R, Velissaris, C, Wah, YW, Wang, J, White, HB, Whitmore, J, Wilking, M, Winstein, B, Winston, R, Worchester, ET, Worchester, M, Yamanaka, T, Zimmerman, ED & Zukanovich, RF 2006, 'Measurement of direct photon emission in the KL→π+π-γ decay mode', Physical Review D - Particles, Fields, Gravitation and Cosmology, vol. 74, no. 3, 032004. https://doi.org/10.1103/PhysRevD.74.032004
Abouzaid, E. ; Arenton, M. ; Barker, A. R. ; Bellantoni, L. ; Bellavance, A. ; Blucher, E. ; Bock, G. J. ; Cheu, Elliott C ; Coleman, R. ; Corcoran, M. D. ; Corti, G. ; Cox, B. ; Erwin, A. R. ; Escobar, C. O. ; Glazov, A. ; Golossanov, A. ; Gomes, R. A. ; Gouffon, P. ; Hanagaki, K. ; Hsiung, Y. B. ; Huang, H. ; Jensen, D. A. ; Kessler, R. ; Kotera, K. ; Ledovskoy, A. ; McBride, P. L. ; Monnier, E. ; Nelson, K. S. ; Nguyen, H. ; Phillips, D. G. ; Ping, H. ; Ramberg, E. J. ; Ray, R. E. ; Ronquest, M. ; Santos, E. ; Shields, J. ; Slater, W. ; Smith, D. ; Solomey, N. ; Swallow, E. C. ; Toale, P. A. ; Tschirhart, R. ; Velissaris, C. ; Wah, Y. W. ; Wang, J. ; White, H. B. ; Whitmore, J. ; Wilking, M. ; Winstein, B. ; Winston, R. ; Worchester, E. T. ; Worchester, M. ; Yamanaka, T. ; Zimmerman, E. D. ; Zukanovich, R. F. / Measurement of direct photon emission in the KL→π+π-γ decay mode. In: Physical Review D - Particles, Fields, Gravitation and Cosmology. 2006 ; Vol. 74, No. 3.
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title = "Measurement of direct photon emission in the KL→π+π-γ decay mode",
abstract = "In this paper the KTeV collaboration reports the analysis of 112.1×103 candidate KL→π+π-γ 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(Mρ2-MK2) +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 Eγ≥20MeV.",
author = "E. Abouzaid and M. Arenton and Barker, {A. R.} and L. Bellantoni and A. Bellavance and E. Blucher and Bock, {G. J.} and Cheu, {Elliott C} and R. Coleman and Corcoran, {M. D.} and G. Corti and B. Cox and Erwin, {A. R.} and Escobar, {C. O.} and A. Glazov and A. Golossanov and Gomes, {R. A.} and P. Gouffon and K. Hanagaki and Hsiung, {Y. B.} and H. Huang and Jensen, {D. A.} and R. Kessler and K. Kotera and A. Ledovskoy and McBride, {P. L.} and E. Monnier and Nelson, {K. S.} and H. Nguyen and Phillips, {D. G.} and H. Ping and Ramberg, {E. J.} and Ray, {R. E.} and M. Ronquest and E. Santos and J. Shields and W. Slater and D. Smith and N. Solomey and Swallow, {E. C.} and Toale, {P. A.} and R. Tschirhart and C. Velissaris and Wah, {Y. W.} and J. Wang and White, {H. B.} and J. Whitmore and M. Wilking and B. Winstein and R. Winston and Worchester, {E. T.} and M. Worchester and T. Yamanaka and Zimmerman, {E. D.} and Zukanovich, {R. F.}",
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T1 - Measurement of direct photon emission in the KL→π+π-γ decay mode

AU - Abouzaid, E.

AU - Arenton, M.

AU - Barker, A. R.

AU - Bellantoni, L.

AU - Bellavance, A.

AU - Blucher, E.

AU - Bock, G. J.

AU - Cheu, Elliott C

AU - Coleman, R.

AU - Corcoran, M. D.

AU - Corti, G.

AU - Cox, B.

AU - Erwin, A. R.

AU - Escobar, C. O.

AU - Glazov, A.

AU - Golossanov, A.

AU - Gomes, R. A.

AU - Gouffon, P.

AU - Hanagaki, K.

AU - Hsiung, Y. B.

AU - Huang, H.

AU - Jensen, D. A.

AU - Kessler, R.

AU - Kotera, K.

AU - Ledovskoy, A.

AU - McBride, P. L.

AU - Monnier, E.

AU - Nelson, K. S.

AU - Nguyen, H.

AU - Phillips, D. G.

AU - Ping, H.

AU - Ramberg, E. J.

AU - Ray, R. E.

AU - Ronquest, M.

AU - Santos, E.

AU - Shields, J.

AU - Slater, W.

AU - Smith, D.

AU - Solomey, N.

AU - Swallow, E. C.

AU - Toale, P. A.

AU - Tschirhart, R.

AU - Velissaris, C.

AU - Wah, Y. W.

AU - Wang, J.

AU - White, H. B.

AU - Whitmore, J.

AU - Wilking, M.

AU - Winstein, B.

AU - Winston, R.

AU - Worchester, E. T.

AU - Worchester, M.

AU - Yamanaka, T.

AU - Zimmerman, E. D.

AU - Zukanovich, R. F.

PY - 2006

Y1 - 2006

N2 - In this paper the KTeV collaboration reports the analysis of 112.1×103 candidate KL→π+π-γ 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(Mρ2-MK2) +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 Eγ≥20MeV.

AB - In this paper the KTeV collaboration reports the analysis of 112.1×103 candidate KL→π+π-γ 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(Mρ2-MK2) +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 Eγ≥20MeV.

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U2 - 10.1103/PhysRevD.74.032004

DO - 10.1103/PhysRevD.74.032004

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