Measurement of the K0 charge radius and a CP-violating asymmetry and a search for CP-violating E1 direct photon emission in the rare decay KL→π+π-e+e-

E. Abouzaid; M. Arenton; A. R. Barker; L. Bellantoni; A. Bellavance; E. Blucher; G. J. Bock; E. 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. Hsiung; H. Huang; D. A. Jensen; R. Kessler; K. Kotera; A. Ledovskoy; P. L. McBride; E. Monnier; K. S. Nelson; H. Nguyen; R. Niclasen; H. Ping; X. R. Qi; 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

doi:10.1103/PhysRevLett.96.101801

Measurement of the K0 charge radius and a CP-violating asymmetry and a search for CP-violating E1 direct photon emission in the rare decay KL→π+π-e+e-

E. Abouzaid, M. Arenton, A. R. Barker, L. Bellantoni, A. Bellavance, E. Blucher, G. J. Bock, E. 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, R. Niclasen, H. Ping, X. R. Qi, 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

Physics

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Abstract

Using the complete KTeV data set of 5241 candidate KL→π+π-e+e- decays (including an estimated background of 204±14 events), we have measured the coupling gCR=0.163±0.014(stat)±0.023(syst) of the CP conserving charge radius process and from it determined a K0 charge radius of rK02 =[-0.077±0.007(stat)±0.011(syst)]fm2. We have determined a first experimental upper limit of 0.04 (90% C.L.) for the ratio |gE1||gM1| of the couplings for the E1 and M1 direct photon emission processes. We also report the measurement of |gM1| including a vector form factor |g M1|(1+a1/a2(Mρ2- MK2)+2MKEγ*), where |g M1|=1.11±0.12(stat)±0.08(syst) and a1/a2=[-0.744±0.027(stat)±0.032(syst)]GeV2/c2. Finally, a CP-violating asymmetry of [13.6±1.4(stat)±1.5(syst)]% in the CP and T odd angle between the decay planes of the e+e- and π+π- pairs in the KL center of mass is reported.

Original language	English (US)
Article number	101801
Journal	Physical review letters
Volume	96
Issue number	10
DOIs	https://doi.org/10.1103/PhysRevLett.96.101801
State	Published - 2006

ASJC Scopus subject areas

General Physics and Astronomy

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10.1103/PhysRevLett.96.101801

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Abouzaid, E., Arenton, M., Barker, A. R., Bellantoni, L., Bellavance, A., Blucher, E., Bock, G. J., Cheu, E., 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., ... Zukanovich, R. F. (2006). Measurement of the K0 charge radius and a CP-violating asymmetry and a search for CP-violating E1 direct photon emission in the rare decay KL→π+π-e+e-. Physical review letters, 96(10), Article 101801. https://doi.org/10.1103/PhysRevLett.96.101801

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 2006, 'Measurement of the K0 charge radius and a CP-violating asymmetry and a search for CP-violating E1 direct photon emission in the rare decay KL→π+π-e+e-', Physical review letters, vol. 96, no. 10, 101801. https://doi.org/10.1103/PhysRevLett.96.101801

@article{982f01fced0f4ce9b5192ce769d9d548,

title = "Measurement of the K0 charge radius and a CP-violating asymmetry and a search for CP-violating E1 direct photon emission in the rare decay KL→π+π-e+e-",

abstract = "Using the complete KTeV data set of 5241 candidate KL→π+π-e+e- decays (including an estimated background of 204±14 events), we have measured the coupling gCR=0.163±0.014(stat)±0.023(syst) of the CP conserving charge radius process and from it determined a K0 charge radius of rK02 =[-0.077±0.007(stat)±0.011(syst)]fm2. We have determined a first experimental upper limit of 0.04 (90% C.L.) for the ratio |gE1||gM1| of the couplings for the E1 and M1 direct photon emission processes. We also report the measurement of |gM1| including a vector form factor |g M1|(1+a1/a2(Mρ2- MK2)+2MKEγ*), where |g M1|=1.11±0.12(stat)±0.08(syst) and a1/a2=[-0.744±0.027(stat)±0.032(syst)]GeV2/c2. Finally, a CP-violating asymmetry of [13.6±1.4(stat)±1.5(syst)]% in the CP and T odd angle between the decay planes of the e+e- and π+π- pairs in the KL center of mass is reported.",

author = "E. Abouzaid and M. Arenton and Barker, {A. R.} and L. Bellantoni and A. Bellavance and E. Blucher and Bock, {G. J.} and E. Cheu 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 R. Niclasen and H. Ping and Qi, {X. R.} 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.}",

year = "2006",

doi = "10.1103/PhysRevLett.96.101801",

language = "English (US)",

volume = "96",

journal = "Physical review letters",

issn = "0031-9007",

publisher = "American Physical Society",

number = "10",

}

TY - JOUR

T1 - Measurement of the K0 charge radius and a CP-violating asymmetry and a search for CP-violating E1 direct photon emission in the rare decay KL→π+π-e+e-

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, E.

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 - Niclasen, R.

AU - Ping, H.

AU - Qi, X. R.

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 - Using the complete KTeV data set of 5241 candidate KL→π+π-e+e- decays (including an estimated background of 204±14 events), we have measured the coupling gCR=0.163±0.014(stat)±0.023(syst) of the CP conserving charge radius process and from it determined a K0 charge radius of rK02 =[-0.077±0.007(stat)±0.011(syst)]fm2. We have determined a first experimental upper limit of 0.04 (90% C.L.) for the ratio |gE1||gM1| of the couplings for the E1 and M1 direct photon emission processes. We also report the measurement of |gM1| including a vector form factor |g M1|(1+a1/a2(Mρ2- MK2)+2MKEγ*), where |g M1|=1.11±0.12(stat)±0.08(syst) and a1/a2=[-0.744±0.027(stat)±0.032(syst)]GeV2/c2. Finally, a CP-violating asymmetry of [13.6±1.4(stat)±1.5(syst)]% in the CP and T odd angle between the decay planes of the e+e- and π+π- pairs in the KL center of mass is reported.

AB - Using the complete KTeV data set of 5241 candidate KL→π+π-e+e- decays (including an estimated background of 204±14 events), we have measured the coupling gCR=0.163±0.014(stat)±0.023(syst) of the CP conserving charge radius process and from it determined a K0 charge radius of rK02 =[-0.077±0.007(stat)±0.011(syst)]fm2. We have determined a first experimental upper limit of 0.04 (90% C.L.) for the ratio |gE1||gM1| of the couplings for the E1 and M1 direct photon emission processes. We also report the measurement of |gM1| including a vector form factor |g M1|(1+a1/a2(Mρ2- MK2)+2MKEγ*), where |g M1|=1.11±0.12(stat)±0.08(syst) and a1/a2=[-0.744±0.027(stat)±0.032(syst)]GeV2/c2. Finally, a CP-violating asymmetry of [13.6±1.4(stat)±1.5(syst)]% in the CP and T odd angle between the decay planes of the e+e- and π+π- pairs in the KL center of mass is reported.

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UR - http://www.scopus.com/inward/citedby.url?scp=33644939438&partnerID=8YFLogxK

U2 - 10.1103/PhysRevLett.96.101801

DO - 10.1103/PhysRevLett.96.101801

M3 - Article

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SN - 0031-9007

VL - 96

JO - Physical review letters

JF - Physical review letters

IS - 10

M1 - 101801

ER -

Measurement of the K0 charge radius and a CP-violating asymmetry and a search for CP-violating E1 direct photon emission in the rare decay KL→π+π-e+e-

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