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Type: Artigo de periódico
Title: Measurement of the K-0 charge radius and a CP-violating asymmetry and a search for CP-violating E1 direct photon emission in the rare decay K-L ->pi(+)pi(-)e(+)e(-)
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
Ping, H
Qi, XR
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
Abstract: Using the complete KTeV data set of 5241 candidate K-L ->pi(+)pi(-)e(+)e(-) decays (including an estimated background of 204 +/- 14 events), we have measured the coupling g(CR)=0.163 +/- 0.014(stat)+/- 0.023(syst) of the CP conserving charge radius process and from it determined a K-0 charge radius of < r(K)(02)>=[-0.077 +/- 0.007(stat)+/- 0.011(syst)]fm(2). We have determined a first experimental upper limit of 0.04 (90% C.L.) for the ratio parallel to g(E1)parallel to/parallel to g(M1)parallel to of the couplings for the E1 and M1 direct photon emission processes. We also report the measurement of parallel to g(M1)parallel to including a vector form factor parallel to g(M1)parallel to(1+a(1)/a(2)/(M-rho(2)-M-K(2))+2M(K)E(gamma+)), where parallel to g(M1)parallel to=1.11 +/- 0.12(stat)+/- 0.08(syst) and a(1)/a(2)=[-0.744 +/- 0.027(stat)+/- 0.032(syst)] GeV2/c(2). Finally, a CP-violating asymmetry of [13.6 +/- 1.4(stat)+/- 1.5(syst)]% in the CP and T odd angle phi between the decay planes of the e(+)e(-) and pi(+)pi(-) pairs in the K-L center of mass is reported.
Country: EUA
Editor: American Physical Soc
Citation: Physical Review Letters. American Physical Soc, v. 96, n. 10, 2006.
Rights: aberto
Identifier DOI: 10.1103/PhysRevLett.96.101801
Date Issue: 2006
Appears in Collections:Unicamp - Artigos e Outros Documentos

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