Data di Pubblicazione:
2004
Abstract:
The semileptonic decay of the neutral K meson, K-L(0) --> pi+/-e-/+upsilon (K-e3), was used to study the strangeness-changing weak interaction of hadrons. A sample of 5.6 million reconstructed events recorded by the NA48 experiment was used to measure the Dalitz plot density. Admitting all possible Lorentz-covariant couplings, the form factors for vector (f+(q(2))), scalar (f(S)) and tensor (f(T)) interactions were measured. The linear slope of the vector form factor lambda(+) = 0.0284 +/- 0.0007 +/- 0.0013 and values for the ratios |f(S)/f(+)(0)| = 0.015(-0.010)(+0.007) +/- 0.012 and |f(T)/f(+)(0)| = 0.05(-0.04)(+0.03) +/- 0.03 were obtained. The values for f(S) and f(T) are consistent with zero. Assuming only vector-axial-vector couplings, lambda(+) = 0.0288 +/- 0.0004 +/- 0.0011 and a good fit consistent with pure V-A couplings were obtained. Alternatively, a fit to a dipole form factor yields a pole mass of M = 859 +/- 18 MeV, consistent with the K*(892) mass. (C) 2004 Elsevier B.V. All rights reserved.
Tipologia CRIS:
03A-Articolo su Rivista
Keywords:
SEMI-LEPTONIC DECAYS; RADIATIVE-CORRECTIONS; TENSOR INTERACTIONS; MONTE-CARLO; KAONS
Elenco autori:
A. Lai;D. Marras;A. Bevan;R. S. Dosanjh;T. J. Gershon;B. Hay;G. E. Kalmus;C. Lazzeroni;D. J. Munday;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. Falaleev;L. Gatignon;A. Gonidec;B. Gorini;G. Govi;P. Grafstrom;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. Madigojine;N. Molokanova;Y. Potrebenikov;S. Stoynev;A. Zinchenko;I. Knowles;V. Martin;R. Sacco;A. Walker;M. Contalbrigo;P. Dalpiaz;J. Duclos;P. L. Frabetti;A. Gianoli;M. Martini;F. Petrucci;M. Savrie;A. Bizzeti;M. Calvetti;G. Collazuol;G. Graziani;E. Iacopini;M. Lenti;F. Martelli;M. Veltri;H. G. Becker;K. Eppard;M. Eppard;H. Fox;A. Kalter;K. Kleinknecht;U. Koch;L. Kopke;P. L. da;P. Marouelli;I. Pellmann;A. Peters;B. Renk;S. A. Schmidt;V. Schonharting;Y. Schue;R. Wanke;A. Winhart;M. Wittgen;J. C. 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. B. Cheze;J. Cogan;M. D. Beer;P. Debu;A. Formica;R. G. de;E. Mazzucato;B. Peyaud;R. Turlay;B. Vallage;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
Link alla scheda completa:
Pubblicato in: