Measurement of the branching ratios of the decays Ξ0→Σ+e−ν¯e and Ξ0¯→Σ+¯e+νe

6533b7dafe1ef96bd126eaa8

RESEARCH PRODUCT

Measurement of the branching ratios of the decays Ξ0→Σ+e−ν¯e and Ξ0¯→Σ+¯e+νe

P. F. Dalpiaz C. Morales Morales U. Moosbrugger M. Valdata B. Panzer-steindel R. Fantechi Konrad Kleinknecht A. Dabrowski C. Cheshkov A. Maier M. C. Petrucci Michael Ziolkowski G.e. Kalmus M. De Beer M. Behler G. Ruggiero Mayda Velasco Nicolo Cartiglia M. Patel H. Dibon Wander Baldini Jacqueline Batley S. Stoynev V. Falaleev Mark Slater C. Cerri E. Menichetti D. T. Madigozhin Nadia Pastrone G. Pierazzini B. Vallage M. Sozzi Leander Litov E. Mazzucato H. D. Wahl Evgueni Goudzovski J.b. Cheze W. Kubischta Augusto Ceccucci P. Debu P.l. Frabetti F. Costantini A. I. Zinchenko G. Collazuol D. J. Munday E. Iacopini M. Eppard B. Peyaud Cristina Biino Ivan Mikulec A. Peters A. Gianoli M. Holder P. Grafström M. Markytan F. Petrucci C. Lazzeroni M. Veltri Lau Gatignon M. Savrie M. Martini G. Bocquet Yu. Potrebenikov Alan W. Walker I. Mannelli M. Calvetti Andrea Bizzeti Vladimir Kekelidze A. Winhart G. Marel L. Masetti Rainer Wanke T. Fonseca Martin F. Marchetto A. Michetti E. C. Swallow Mauro Piccini P. Cenci N. A. Molokanova K. Eppard R. Sacco G. Neuhofer S. Giudici D.c. Cundy M. Lenti P. Hristov S. A. Wotton U. Koch Niels Doble G. Lamanna Marco Clemencic E. Imbergamo Roberta Arcidiacono P. Rubin S. Goy Lopez A. Norton Roland Winston E. Monnier L. Fiorini M. Pepe A. Gonidec L. Widhalm M. Scarpa W. Wislicki P. Marouelli Manfred Jeitler G. Anzivino G. Gouge P. Lubrano A. Nappi A. Hirstius

subject

Nuclear physics Physics Nuclear and High Energy Physics 010308 nuclear & particles physics Cabibbo–Kobayashi–Maskawa matrix 0103 physical sciences Sigma Particle Data Group 010306 general physics Branching (polymer chemistry)01 natural sciences

description

Abstract From 56 days of data taking in 2002, the NA48/1 experiment observed 6316 Ξ 0 → Σ + e − ν ¯ e candidates (with the subsequent Σ + → p π 0 decay) and 555 Ξ 0 ¯ → Σ + ¯ e + ν e candidates with background contamination of 215 ± 44 and 136 ± 8 events, respectively. From these samples, the branching ratios BR ( Ξ 0 → Σ + e − ν ¯ e ) = ( 2.51 ± 0.03 stat ± 0.09 syst ) × 10 −4 and BR ( Ξ 0 ¯ → Σ + ¯ e + ν e ) = ( 2.55 ± 0.14 stat ± 0.10 syst ) × 10 −4 were measured allowing the determination of the CKM matrix element | V us | = 0.209 −0.028 +0.023 . Using the Particle Data Group average for | V us | obtained in semileptonic kaon decays, we measured the ratio g 1 / f 1 = 1.20 ± 0.05 of the axial-vector to vector form factors.

year	journal	country	edition	language
2007-02-01	Physics Letters B

https://doi.org/10.1016/j.physletb.2006.12.028