Precise measurement of the decay KL → π0γγ
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 consta...
| Main Authors: | , , , , , , , , , , , , , , , , , , , , , , , , |
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| Format: | Journal article |
| Language: | English |
| Published: |
2002
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| _version_ | 1826280274614288384 |
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| author | Lai, A Marras, D Bevan, A Dosanjh, R Gershon, T Hay, B Kalmus, G Lazzeroni, C Munday, D Needham, MD Olaiya, E Parker, M White, T 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 |
| author_facet | Lai, A Marras, D Bevan, A Dosanjh, R Gershon, T Hay, B Kalmus, G Lazzeroni, C Munday, D Needham, MD Olaiya, E Parker, M White, T 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 |
| author_sort | Lai, A |
| collection | OXFORD |
| description | 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. © 2002 Published by Elsevier Science B.V. |
| first_indexed | 2024-03-07T00:11:14Z |
| format | Journal article |
| id | oxford-uuid:794f2d72-f729-4f49-be80-56534ad57341 |
| institution | University of Oxford |
| language | English |
| last_indexed | 2024-03-07T00:11:14Z |
| publishDate | 2002 |
| record_format | dspace |
| spelling | oxford-uuid:794f2d72-f729-4f49-be80-56534ad573412022-03-26T20:36:42ZPrecise measurement of the decay KL → π0γγJournal articlehttp://purl.org/coar/resource_type/c_dcae04bcuuid:794f2d72-f729-4f49-be80-56534ad57341EnglishSymplectic Elements at Oxford2002Lai, AMarras, DBevan, ADosanjh, RGershon, THay, BKalmus, GLazzeroni, CMunday, DNeedham, MDOlaiya, EParker, MWhite, TWotton, SABarr, GBocquet, GCeccucci, ACuhadar-Dönszelmann, TCundy, DD'Agostini, GDoble, NFalaleev, VGatignon, LGonidec, AGorini, BThe 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. © 2002 Published by Elsevier Science B.V. |
| spellingShingle | Lai, A Marras, D Bevan, A Dosanjh, R Gershon, T Hay, B Kalmus, G Lazzeroni, C Munday, D Needham, MD Olaiya, E Parker, M White, T 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 Precise measurement of the decay KL → π0γγ |
| title | Precise measurement of the decay KL → π0γγ |
| title_full | Precise measurement of the decay KL → π0γγ |
| title_fullStr | Precise measurement of the decay KL → π0γγ |
| title_full_unstemmed | Precise measurement of the decay KL → π0γγ |
| title_short | Precise measurement of the decay KL → π0γγ |
| title_sort | precise measurement of the decay kl π0γγ |
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