A preliminary result of a new measurement of the K+ ?p+µ+µ- form factor parameters and branching fraction using the NA62 Run 1 data set collected in the years 2016 - 2018 is presented. From the observed sample of 28011 K+ ? p+µ+µ- event candidates with negligible background contamination, the form factor parameters a+ = -0.592 ± 0.013stat ± 0.007syst ± 0.001ext and b+ = -0.699 ± 0.046stat ± 0.035syst ± 0.003ext, and the branching fraction B(K+ ? p+µ+µ-) = (9.27 ± 0.07stat ± 0.08syst ± 0.04ext) × 10-8 are obtained.
New measurement of the K+ ? p+µ+µ-decay at NA62 / Bician L., Aliberti R., Ambrosino F., Ammendola R., Angelucci B., Antonelli A., Anzivino G., Arcidiacono R., Bache T., Baeva A., Baigarashev D., Barbanera M., Bernhard J., Biagioni A., Biino C., Bizzeti A., Blazek T., Bloch-Devaux B., Bonaiuto V., Boretto M., et al.. - In: POS PROCEEDINGS OF SCIENCE. - ISSN 1824-8039. - ELETTRONICO. - 390:(2021), pp. 1-6. (40th International Conference on High Energy Physics, ICHEP 2020 cze 2020).
New measurement of the K+ ? p+µ+µ-decay at NA62
Bizzeti A.
;Bucci F.
;Cerri C.;Corvino M.;Costantini F.;D'Agostini G.;Di Lella L.;Fantechi R.;Filippi A.;Graham C.;Iacopini E.
;Lari E.;Latino G.
;Lenti M.
;Mannelli I.;Marchevski R.
;Migliore E.;Minucci E.;Raggi M.;Ruggiero G.
;Sozzi M.;Vicini P.;Volpe R.
;
2021
Abstract
A preliminary result of a new measurement of the K+ ?p+µ+µ- form factor parameters and branching fraction using the NA62 Run 1 data set collected in the years 2016 - 2018 is presented. From the observed sample of 28011 K+ ? p+µ+µ- event candidates with negligible background contamination, the form factor parameters a+ = -0.592 ± 0.013stat ± 0.007syst ± 0.001ext and b+ = -0.699 ± 0.046stat ± 0.035syst ± 0.003ext, and the branching fraction B(K+ ? p+µ+µ-) = (9.27 ± 0.07stat ± 0.08syst ± 0.04ext) × 10-8 are obtained.I documenti in FLORE sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.



