Data di Pubblicazione:
2007
Abstract:
This Letter reports on a new high precision measurement of the form factors of the K L → π ± μ ∓ ν μ decay. The data sample of about 2.3 × 10 6 events was recorded in 1999 by the NA48 experiment at CERN. Studying the Dalitz plot density we measured a linear, λ + ′ = ( 20.5 ± 2.2 stat ± 2.4 syst ) × 10 −3 , and a quadratic, λ + ″ = ( 2.6 ± 0.9 stat ± 1.0 syst ) × 10 −3 term in the power expansion of the vector form factor. No evidence was found for a second order term for the scalar form factor; the linear slope was determined to be λ 0 = ( 9.5 ± 1.1 stat ± 0.8 syst ) × 10 −3 . Using a linear fit our results were: λ + = ( 26.7 ± 0.6 stat ± 0.8 syst ) × 10 −3 and λ 0 = ( 11.7 ± 0.7 stat ± 1.0 syst ) × 10 −3 . A pole fit of the form factors yields: m V = ( 905 ± 9 stat ± 17 syst ) MeV / c 2 and m S = ( 1400 ± 46 stat ± 53 syst ) MeV / c 2 .
Tipologia CRIS:
03A-Articolo su Rivista
Keywords:
Kaon semileptonic decays
Elenco autori:
A. Lai;D. Marras;A. Bevan;R. Dosanjh;T. Gershon;B. Hay;G. Kalmus;C. Lazzeroni;D. Munday;E. Olaiya;M. Parker;T. White;S. 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;A. Norton;S. Palestini;B. Panzer-Steindel;H. Taureg;M. Velasco;H. Wahl;C. Cheshkov;P. Hristov;V. Kekelidze;L. Litov;D. Madigozhin;N. Molokanova;Y. Potrebenikov;S. Stoynev;A. Zinchenko;I. Knowles;V. Martin;R. Sacco;A. Walker;M. Contalbrigo;P. Dalpiaz;J. Duclos;P. Frabetti;A. Gianoli;M. Martini;F. Petrucci;M. Savrié;A. Bizzeti;M. Calvetti;G. Collazuol;G. Graziani;E. Iacopini;M. Lenti;G. Ruggiero;M. Veltri;H. Becker;K. Eppard;M. Eppard;H. Fox;A. Kalter;K. Kleinknecht;U. Koch;L. Köpke;P. L. da;P. Marouelli;I. Pellmann;A. Peters;B. Renk;S. Schmidt;V. Schönharting;Y. Schué;R. Wanke;A. Winhart;M. Wittgen;J. Chollet;L. Fayard;L. Iconomidou-Fayard;J. Ocariz;G. Unal;I. Wingerter-Seez;G. Anzivino;P. Cenci;E. Imbergamo;P. Lubrano;A. Mestvirishvili;A. Nappi;M. Pepe;M. Piccini;L. Bertanza;R. Carosi;R. Casali;C. Cerri;M. Cirilli;F. Costantini;R. Fantechi;S. Giudici;I. Mannelli;G. Pierazzini;M. Sozzi;J. Cheze;J. Cogan;M. D. Beer;P. Debu;A. Formica;R. G. de;E. Mazzucato;B. Peyaud;R. Turlay;B. Vallage;R. Bernhard;M. Holder;A. Maier;M. Ziolkowski;R. Arcidiacono;C. Biino;N. Cartiglia;F. Marchetto;E. Menichetti;N. Pastrone;J. Nassalski;E. Rondio;M. Szleper;W. Wislicki;S. Wronka;H. Dibon;G. Fischer;M. Jeitler;M. Markytan;I. Mikulec;G. Neuhofer;M. Pernicka;A. Taurok;L. Widhalm
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