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Type: Artigo de periódico
Title: Measurement of direct photon emission in the K-L ->pi(+)pi(-)gamma decay mode
Author: Abouzaid, E
Arenton, M
Barker, AR
Bellantoni, L
Bellavance, A
Blucher, E
Bock, GJ
Cheu, E
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
Niclasen, R
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
Worcester, ET
Worcester, M
Yamanaka, T
Zimmerman, ED
Zukanovich, RF
Abstract: In this paper the KTeV collaboration reports the analysis of 112.1x10(3) candidate K-L ->pi(+)pi(-)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 vertical bar(g) over tilde (M1)vertical bar(1+a(1)/a(2)/(M-rho(2)-M-K(2))+2M(K)E(gamma)) have been measured to be vertical bar g(M1)vertical bar=1.198 +/- 0.035(stat)+/- 0.086(syst) and a(1)/a(2)=-0.738 +/- 0.007(stat)+/- 0.018(syst) GeV2/c(2) respectively. An upper limit for the CP violating E1 direct emission amplitude vertical bar g(E1)vertical bar <= 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 E-gamma >= 20 MeV.
Country: EUA
Editor: American Physical Soc
Citation: Physical Review D. American Physical Soc, v. 74, n. 3, 2006.
Rights: aberto
Identifier DOI: 10.1103/PhysRevD.74.032004
Date Issue: 2006
Appears in Collections:Unicamp - Artigos e Outros Documentos

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