Skip to Main content Skip to Navigation
Journal articles

Precise measurement of the decay $K_{L} \to\pi^{0}\gamma\gamma$

A. Lai D. Marras J R. Batley 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-Donszelmann D. Cundy G. d'Agostini N. Doble V P. Falaleev W. Funk L. Gatignon A. Gonidec B. Gorini G. Govi P. Grafstrom W. Kubischta A. Lacourt M. Lenti S. Luitz J P. Matheys I. Mikulec A. Norton S. Palestini B. Panzer-Steindel D. Schinzel G. Tatishvili H. Taureg M. Velasco O. Vossnack H. Wahl C. Cheshkov A. Gaponenko P Z. Khristov V. Kekelidze D. Madigojine N. Molokanova Yu. Potrebenikov A. Tkachev A. Zinchenko I. Knowles V. Martin H. Parsons R. Sacco A. Walker M. Contalbrigo P. Dalpiaz J. Duclos P L. Frabetti A. Gianoli M. Martini F. Petrucci M. Savrie M. Scarpa A. Bizzeti M. Calvetti G. Collazuol G. Graziani E. Iacopini F. Martelli M. Veltri H G. Becker H. Bluemer D. Coward M. Eppard H. Fox A. Hirstius K. Holtz A. Kalter K. Kleinknecht U. Koch L. Kopke P. Lopes da Silva P. Marouelli I. Pellmann A. Peters S A. Schmidt V. Schonharting Y. Schue R. Wanke A. Winhart M. Wittgen J C. Chollet 1 S. Crepe 1 L. Fayard 1 L. Iconomidou-Fayard 1 J. Ocariz 1 G. Unal 1 I. Wingerter-Seez 1 G. Anzivino P. Cenci E. Imbergamo P. Lubrano A. Mestvirishvili A. Nappi M. Pepe M. Piccini L. Bertanza A. Bigi P. Calafiura R. Carosi R. Casali C. Cerri M. Cirilli F. Costantini R. Fantechi S. Giudici I. Mannelli G. Pierazzini M. Sozzi J B. Cheze J. Cogan M. de Beer P. Debu F. Derue A. Formica R. Granier de Cassagnac E. Mazzucato B. Peyaud R. Turlay B. Vallage I. Augustin M. Bender M. Holder A. Maier M. Ziolkowski R. Arcidiacono C. Biino N. Cartiglia R. Guida F. Marchetto E. Menichetti N. Pastrone J P. Nassalski E. Rondio M. Szleper W. Wislicki S. Wronka H. Dibon G. Fischer M. Jeitler M. Markytan G. Neuhofer M. Pernicka A. Taurok L. Widhalm
Abstract : The decay rate of $\klpgg$ has been measured with the NA48 detector at the CERN SPS. A total of $2558$ $\klpgg$ candidates have been observed with a residual background of $3.2\%$. The branching ratio is determined to be $(1.36 \pm0.03_{(stat)} \pm0.03_{(syst)}\pm 0.03_{(norm)})\times10^{-6}$ and the vector coupling constant $a_v = -0.46 \pm0.03_{(stat)} \pm0.04_{(syst)}$. This result suggests that the CP-violation effects are dominating in the $\klpee$ decay. An upper limit for the $\klpgg$ decay rate in the two photon mass region $m_{\gamma\gamma} m_{\pi^0}$ is also given
Document type :
Journal articles
Complete list of metadata

Cited literature [7 references]  Display  Hide  Download

http://hal.in2p3.fr/in2p3-00011740
Contributor : Hélène Kerec Connect in order to contact the contributor
Submitted on : Tuesday, June 25, 2002 - 2:56:58 PM
Last modification on : Saturday, January 2, 2021 - 11:26:02 PM
Long-term archiving on: : Tuesday, March 30, 2010 - 5:01:05 PM

Identifiers

  • HAL Id : in2p3-00011740, version 1

Collections

LAL | CNRS | IN2P3

Citation

A. Lai, D. Marras, J R. Batley, A. Bevan, R S. Dosanjh, et al.. Precise measurement of the decay $K_{L} \to\pi^{0}\gamma\gamma$. Physics Letters B, Elsevier, 2002, 536, pp.229-240. ⟨in2p3-00011740⟩

Share

Metrics

Record views

137

Files downloads

115