Abstract: A sample of more than one million K-+/- -> pi(+)pi(-)e(+/-)v (K-e4) decay candidates with less than one percent background contamination has been collected by the NA48/2 experiment at the CERN SPS in 2003-2004, allowing a detailed study of the decay properties. The branching ratio, inclusive of K-e4 gamma decays, is measured to be BR(K-e4) = (4.257 +/- 0.016(exp) +/- 0.031(ext)) x 10(-5) with a total relative error of 0.8%. This measurement complements the study of S- and P-wave hadronic form factors by assigning absolute values to the relative hadronic form factors obtained earlier in a simultaneous analysis of the pi pi scattering lengths conducted on the same data sample. The overall form factor normalization f(s) = 5.705 +/- 0.017(exp) +/- 0.031(ext) is obtained with a total relative precision of 0.6%.

New measurement of the decay branching ratio and hadronic form factors / J.R. Batley;G. Kalmus;C. Lazzeroni;D.J. Munday;M.W. Slater;S.A. Wotton;R. Arcidiacono;G. Bocquet;N. Cabibbo;A. Ceccucci;D. Cundy;V. Falaleev;M. Fidecaro;L. Gatignon;A. Gonidec;W. Kubischta;A. Norton;A. Maier;M. Patel;A. Peters;S. Balev;P.L. Frabetti;E. Gersabeck;E. Goudzovski;P. Hristov;V. Kekelidze;V. Kozhuharov;L. Litov;D. Madigozhin;N. Molokanova;I. Polenkevich;Yu. Potrebenikov;S. Stoynev;A. Zinchenko;E. Monnier;E. Swallow;R. Winston;P. Rubin;A. Walker;W. Baldini;A. Cotta Ramusino;P. Dalpiaz;C. Damiani;M. Fiorini;A. Gianoli;M. Martini;F. Petrucci;M. Savrié;M. Scarpa;H. Wahl;A. Bizzeti;M. Lenti;M. Veltri;M. Calvetti;E. Iacopini;G. Ruggiero;M. Behler;K. Eppard;K. Kleinknecht;P. Marouelli;L. Masetti;U. Moosbrugger;C. Morales Morales;B. Renk;M. Wache;R. Wanke;A. Winhart;D. Coward;A. Dabrowski;T. Fonseca Martin;M. Shieh;M. Szleper;M. Velasco;M.D. Wood;P. Cenci;M. Pepe;M.C. Petrucci;G. Anzivino;E. Imbergamo;A. Nappi;M. Piccini;M. Raggi;M. Valdata-Nappi;C. Cerri;R. Fantechi;G. Collazuol;L. DiLella;G. Lamanna;I. Mannelli;A. Michetti;F. Costantini;N. Doble;L. Fiorini;S. Giudici;G. Pierazzini;M. Sozzi;S. Venditti;B. Bloch-Devaux;C. Cheshkov;J.B. Chèze;M. De Beer;J. Derré;G. Marel;E. Mazzucato;B. Peyaud;B. Vallage;M. Holder;M. Ziolkowski;C. Biino;N. Cartiglia;F. Marchetto;S. Bifani;M. Clemencic;S. Goy Lopez;H. Dibon;M. Jeitler;M. Markytan;I. Mikulec;G. Neuhofer;L. Widhalm. - In: PHYSICS LETTERS. SECTION B. - ISSN 0370-2693. - STAMPA. - 715:(2012), pp. 105-115. [10.1016/j.physletb.2012.07.048]

New measurement of the decay branching ratio and hadronic form factors

M. Lenti;CALVETTI, MARIO;IACOPINI, ENRICO;
2012

Abstract

Abstract: A sample of more than one million K-+/- -> pi(+)pi(-)e(+/-)v (K-e4) decay candidates with less than one percent background contamination has been collected by the NA48/2 experiment at the CERN SPS in 2003-2004, allowing a detailed study of the decay properties. The branching ratio, inclusive of K-e4 gamma decays, is measured to be BR(K-e4) = (4.257 +/- 0.016(exp) +/- 0.031(ext)) x 10(-5) with a total relative error of 0.8%. This measurement complements the study of S- and P-wave hadronic form factors by assigning absolute values to the relative hadronic form factors obtained earlier in a simultaneous analysis of the pi pi scattering lengths conducted on the same data sample. The overall form factor normalization f(s) = 5.705 +/- 0.017(exp) +/- 0.031(ext) is obtained with a total relative precision of 0.6%.
2012
715
105
115
J.R. Batley;G. Kalmus;C. Lazzeroni;D.J. Munday;M.W. Slater;S.A. Wotton;R. Arcidiacono;G. Bocquet;N. Cabibbo;A. Ceccucci;D. Cundy;V. Falale...espandi
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Utilizza questo identificatore per citare o creare un link a questa risorsa: https://hdl.handle.net/2158/816876
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