Precise measurement of the decay KL → π0γγ

A. Lai; D. Marras; A. Bevan; R. S. Dosanjh; T. J. Gershon; B. Hay; G. E. Kalmus; C. Lazzeroni; D. J. Munday; M. D. Needham; E. Olaiya; M. A. Parker; T. O. White; S. A. Wotton; G. Barr; G. Bocquet; A. Ceccucci; T. Cuhadar-Dönszelmann; D. Cundy; G. D'Agostini; N. Doble; V. Falaleev; L. Gatignon; A. Gonidec; B. Gorini; G. Govi; P. Grafström; W. Kubischta; A. Lacourt; M. Lenti; S. Luitz; I. Mikulec; A. Norton; S. Palestini; B. Panzer-Steindel; G. Tatishvili; H. Taureg; M. Velasco; H. Wahl; C. Cheshkov; P. Hristov; V. Kekelidze; D. Madigojine; N. Molokanova; Yu Potrebenikov; A. Zinchenko; I. Knowles; V. Martin; R. Sacco; A. Walker; M. Contalbrigo; P. Dalpiaz; J. Duclos; P. L. Frabetti; A. Gianoli; M. Martini

doi:10.1016/S0370-2693(02)01863-4

Precise measurement of the decay K_L → π⁰γγ

A. Lai^*, D. Marras, A. Bevan, R. S. Dosanjh, T. J. Gershon, B. Hay, G. E. Kalmus, C. Lazzeroni, D. J. Munday, M. D. Needham, E. Olaiya, M. A. Parker, T. O. White, S. A. Wotton, G. Barr, G. Bocquet, A. Ceccucci, T. Cuhadar-Dönszelmann, D. Cundy, G. D'AgostiniN. Doble, V. Falaleev, L. Gatignon, A. Gonidec, B. Gorini, G. Govi, P. Grafström, W. Kubischta, A. Lacourt, M. Lenti, S. Luitz, I. Mikulec, A. Norton, S. Palestini, B. Panzer-Steindel, G. Tatishvili, H. Taureg, M. Velasco, H. Wahl, C. Cheshkov, P. Hristov, V. Kekelidze, D. Madigojine, N. Molokanova, Yu Potrebenikov, A. Zinchenko, I. Knowles, V. Martin, R. Sacco, A. Walker, M. Contalbrigo, P. Dalpiaz, J. Duclos, P. L. Frabetti, A. Gianoli, M. Martini

^*Corresponding author for this work

Physics and Astronomy

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Abstract

The decay rate of K_L → π⁰ γγ has been measured with the NA48 detector at the CERN SPS. A total of 2558 K_L π⁰γγ candidates have been observed with a residual background of 3.2%. The branching ratio is determined to be (1.36 ± 0.03_(stat) ± 0.03_(syst) ± 0.03_(norm)) × 10^-6 and the vector coupling constant a_v = -0.46 ± 0.03_(stat) ± 0.04_(syst). This result suggests that the CP-violation effects are dominating in the K_L → π⁰e⁺e^- decay. An upper limit for the K_L → π⁰γγ decay rate in the two photon mass region m_γγ < m_π0 is also given.

Original language	English (US)
Pages (from-to)	229-240
Number of pages	12
Journal	Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
Volume	536
Issue number	3-4
DOIs	https://doi.org/10.1016/S0370-2693(02)01863-4
State	Published - Jun 6 2002

ASJC Scopus subject areas

Nuclear and High Energy Physics

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Lai, A., Marras, D., Bevan, A., Dosanjh, R. S., Gershon, T. J., Hay, B., Kalmus, G. E., Lazzeroni, C., Munday, D. J., Needham, M. D., Olaiya, E., Parker, M. A., White, T. O., Wotton, S. A., Barr, G., Bocquet, G., Ceccucci, A., Cuhadar-Dönszelmann, T., Cundy, D., ... Martini, M. (2002). Precise measurement of the decay K_L → π⁰γγ. Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics, 536(3-4), 229-240. https://doi.org/10.1016/S0370-2693(02)01863-4

@article{2f0db2af93e94d48bf98e463ded80950,

title = "Precise measurement of the decay KL → π0γγ",

abstract = "The decay rate of KL → π0 γγ has been measured with the NA48 detector at the CERN SPS. A total of 2558 KL π0γγ candidates have been observed with a residual background of 3.2%. The branching ratio is determined to be (1.36 ± 0.03(stat) ± 0.03(syst) ± 0.03(norm)) × 10-6 and the vector coupling constant av = -0.46 ± 0.03(stat) ± 0.04(syst). This result suggests that the CP-violation effects are dominating in the KL → π0e+e- decay. An upper limit for the KL → π0γγ decay rate in the two photon mass region mγγ < mπ0 is also given.",

author = "A. Lai and D. Marras and A. Bevan and Dosanjh, {R. S.} and Gershon, {T. J.} and B. Hay and Kalmus, {G. E.} and C. Lazzeroni and Munday, {D. J.} and Needham, {M. D.} and E. Olaiya and Parker, {M. A.} and White, {T. O.} and Wotton, {S. A.} and G. Barr and G. Bocquet and A. Ceccucci and T. Cuhadar-D{\"o}nszelmann and D. Cundy and G. D'Agostini and N. Doble and V. Falaleev and L. Gatignon and A. Gonidec and B. Gorini and G. Govi and P. Grafstr{\"o}m and W. Kubischta and A. Lacourt and M. Lenti and S. Luitz and I. Mikulec and A. Norton and S. Palestini and B. Panzer-Steindel and G. Tatishvili and H. Taureg and M. Velasco and H. Wahl and C. Cheshkov and P. Hristov and V. Kekelidze and D. Madigojine and N. Molokanova and Yu Potrebenikov and A. Zinchenko and I. Knowles and V. Martin and R. Sacco and A. Walker and M. Contalbrigo and P. Dalpiaz and J. Duclos and Frabetti, {P. L.} and A. Gianoli and M. Martini",

year = "2002",

month = jun,

day = "6",

doi = "10.1016/S0370-2693(02)01863-4",

language = "English (US)",

volume = "536",

pages = "229--240",

journal = "Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics",

issn = "0370-2693",

publisher = "Elsevier",

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Lai, A, Marras, D, Bevan, A, Dosanjh, RS, Gershon, TJ, Hay, B, Kalmus, GE, Lazzeroni, C, Munday, DJ, Needham, MD, Olaiya, E, Parker, MA, White, TO, Wotton, SA, Barr, G, Bocquet, G, Ceccucci, A, Cuhadar-Dönszelmann, T, Cundy, D, D'Agostini, G, Doble, N, Falaleev, V, Gatignon, L, Gonidec, A, Gorini, B, Govi, G, Grafström, P, Kubischta, W, Lacourt, A, Lenti, M, Luitz, S, Mikulec, I, Norton, A, Palestini, S, Panzer-Steindel, B, Tatishvili, G, Taureg, H, Velasco, M, Wahl, H, Cheshkov, C, Hristov, P, Kekelidze, V, Madigojine, D, Molokanova, N, Potrebenikov, Y, Zinchenko, A, Knowles, I, Martin, V, Sacco, R, Walker, A, Contalbrigo, M, Dalpiaz, P, Duclos, J, Frabetti, PL, Gianoli, A & Martini, M 2002, 'Precise measurement of the decay K_L → π⁰γγ', Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics, vol. 536, no. 3-4, pp. 229-240. https://doi.org/10.1016/S0370-2693(02)01863-4

TY - JOUR

T1 - Precise measurement of the decay KL → π0γγ

AU - Lai, A.

AU - Marras, D.

AU - Bevan, A.

AU - Dosanjh, R. S.

AU - Gershon, T. J.

AU - Hay, B.

AU - Kalmus, G. E.

AU - Lazzeroni, C.

AU - Munday, D. J.

AU - Needham, M. D.

AU - Olaiya, E.

AU - Parker, M. A.

AU - White, T. O.

AU - Wotton, S. A.

AU - Barr, G.

AU - Bocquet, G.

AU - Ceccucci, A.

AU - Cuhadar-Dönszelmann, T.

AU - Cundy, D.

AU - D'Agostini, G.

AU - Doble, N.

AU - Falaleev, V.

AU - Gatignon, L.

AU - Gonidec, A.

AU - Gorini, B.

AU - Govi, G.

AU - Grafström, P.

AU - Kubischta, W.

AU - Lacourt, A.

AU - Lenti, M.

AU - Luitz, S.

AU - Mikulec, I.

AU - Norton, A.

AU - Palestini, S.

AU - Panzer-Steindel, B.

AU - Tatishvili, G.

AU - Taureg, H.

AU - Velasco, M.

AU - Wahl, H.

AU - Cheshkov, C.

AU - Hristov, P.

AU - Kekelidze, V.

AU - Madigojine, D.

AU - Molokanova, N.

AU - Potrebenikov, Yu

AU - Zinchenko, A.

AU - Knowles, I.

AU - Martin, V.

AU - Sacco, R.

AU - Walker, A.

AU - Contalbrigo, M.

AU - Dalpiaz, P.

AU - Duclos, J.

AU - Frabetti, P. L.

AU - Gianoli, A.

AU - Martini, M.

PY - 2002/6/6

Y1 - 2002/6/6

N2 - The decay rate of KL → π0 γγ has been measured with the NA48 detector at the CERN SPS. A total of 2558 KL π0γγ candidates have been observed with a residual background of 3.2%. The branching ratio is determined to be (1.36 ± 0.03(stat) ± 0.03(syst) ± 0.03(norm)) × 10-6 and the vector coupling constant av = -0.46 ± 0.03(stat) ± 0.04(syst). This result suggests that the CP-violation effects are dominating in the KL → π0e+e- decay. An upper limit for the KL → π0γγ decay rate in the two photon mass region mγγ < mπ0 is also given.

AB - The decay rate of KL → π0 γγ has been measured with the NA48 detector at the CERN SPS. A total of 2558 KL π0γγ candidates have been observed with a residual background of 3.2%. The branching ratio is determined to be (1.36 ± 0.03(stat) ± 0.03(syst) ± 0.03(norm)) × 10-6 and the vector coupling constant av = -0.46 ± 0.03(stat) ± 0.04(syst). This result suggests that the CP-violation effects are dominating in the KL → π0e+e- decay. An upper limit for the KL → π0γγ decay rate in the two photon mass region mγγ < mπ0 is also given.

UR - http://www.scopus.com/inward/record.url?scp=0037030453&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=0037030453&partnerID=8YFLogxK

U2 - 10.1016/S0370-2693(02)01863-4

DO - 10.1016/S0370-2693(02)01863-4

M3 - Article

AN - SCOPUS:0037030453

SN - 0370-2693

VL - 536

SP - 229

EP - 240

JO - Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics

JF - Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics

IS - 3-4

ER -

Precise measurement of the decay K_L → π⁰γγ

Abstract

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