{"id":33346,"date":"2018-03-09T09:30:25","date_gmt":"2018-03-09T09:30:25","guid":{"rendered":"https:\/\/www.deberes.net\/tesis\/sin-categoria\/medida-de-la-fraccion-de-sucesos-z-bb-en-desintegraciones-hadronicas\/"},"modified":"2018-03-09T09:30:25","modified_gmt":"2018-03-09T09:30:25","slug":"medida-de-la-fraccion-de-sucesos-z-bb-en-desintegraciones-hadronicas","status":"publish","type":"post","link":"https:\/\/www.deberes.net\/tesis\/fisica\/medida-de-la-fraccion-de-sucesos-z-bb-en-desintegraciones-hadronicas\/","title":{"rendered":"Medida de la fraccion de sucesos z-bb en desintegraciones hadronicas."},"content":{"rendered":"<h2>Tesis doctoral de <strong> Mar\u00eda Chamizo Llatas <\/strong><\/h2>\n<p>En este trabajo se presenta la primera medida de la fracci\u00f3n de sucesos z-bb en desintegraciones hadr\u00f3nicas, realizada en l3, utilizando el m\u00e9todo de la longitud de desintegraci\u00f3n. Los datos utilizados son los recogidos por el detector l3 durante el a\u00f1o 1994 siendo el n\u00famero de sucesos hadr\u00f3nicos seleccionados, en la regi\u00f3n !Cos th! Menor 0.7, con informaci  \u00f3n del detector de v\u00e9rtice de 566282. Para determinar el valor de r     = (z- bb) \/   (z- had) se han analizado dos m\u00e9todos: el m\u00e9todo \u00abdouble tag\u00bb y el \u00abfolded double tag\u00bb. El valor de r     se ha obtenido en funci\u00f3n del valor de la significaci\u00f3n estad\u00edstica de la longitud de desintegraci\u00f3n, s. A partir de un estudio detallado de los errores que contribuyen al error de r    se concluye que el valor \u00f3ptimo de s para obtener el resultado final es scut = 4, para el que la pureza en sucesos bb   es de un 85%. Los valores de r obtenidos con los dos m\u00e9todos son compatibles para este valor de s. Sin embargo se observa, que utilizando el m\u00e9todo folded double tag se reduce considerablemente los errores de r   que provienen del desconocimiento en la resoluci\u00f3n del detector y de la simulaci\u00f3n de la muestra de quarks uds. Por lo tanto el resultado final presentado es el obtenido con el m\u00e9todo \u00abfolded double tag\u00bb para !S! 4:  r   =0.2196 +- 0.0029 (est) +- 0.0027 (sist) &#8211; 0.086 (rc &#8211; 0.172)<\/p>\n<p>&nbsp;<\/p>\n<h3>Datos acad\u00e9micos de la tesis doctoral \u00ab<strong>Medida de la fraccion de sucesos z-bb en desintegraciones hadronicas.<\/strong>\u00ab<\/h3>\n<ul>\n<li><strong>T\u00edtulo de la tesis:<\/strong>\u00a0 Medida de la fraccion de sucesos z-bb en desintegraciones hadronicas. <\/li>\n<li><strong>Autor:<\/strong>\u00a0 Mar\u00eda Chamizo Llatas <\/li>\n<li><strong>Universidad:<\/strong>\u00a0 Aut\u00f3noma de Madrid<\/li>\n<li><strong>Fecha de lectura de la tesis:<\/strong>\u00a0 25\/11\/1997<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n<h3>Direcci\u00f3n y tribunal<\/h3>\n<ul>\n<li><strong>Director de la tesis<\/strong>\n<ul>\n<li>Carlos Ma\u00f1a Barrera<\/li>\n<\/ul>\n<\/li>\n<li><strong>Tribunal<\/strong>\n<ul>\n<li>Presidente del tribunal: jos\u00e9 Bernabe\u00fa alberola <\/li>\n<li>Alberto Ruiz jimeno (vocal)<\/li>\n<li> Aguilar benitez-de lugo  Manuel (vocal)<\/li>\n<li>Antonio Dobado gonz\u00e1lez (vocal)<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Tesis doctoral de Mar\u00eda Chamizo Llatas En este trabajo se presenta la primera medida de la fracci\u00f3n de sucesos z-bb [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"site-sidebar-layout":"default","site-content-layout":"","ast-site-content-layout":"","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","theme-transparent-header-meta":"","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"default","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"var(--ast-global-color-4)","background-image":"","background-repeat":"repeat","background-position":"center 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