{"id":90147,"date":"2018-03-10T00:15:33","date_gmt":"2018-03-10T00:15:33","guid":{"rendered":"https:\/\/www.deberes.net\/tesis\/sin-categoria\/measurement-of-hadron-fractions-inproton-nucleus-interactions-at-920-gevm-using-the-hera-b-detector\/"},"modified":"2018-03-10T00:15:33","modified_gmt":"2018-03-10T00:15:33","slug":"measurement-of-hadron-fractions-inproton-nucleus-interactions-at-920-gevm-using-the-hera-b-detector","status":"publish","type":"post","link":"https:\/\/www.deberes.net\/tesis\/fisica\/measurement-of-hadron-fractions-inproton-nucleus-interactions-at-920-gevm-using-the-hera-b-detector\/","title":{"rendered":"Measurement of hadron fractions inproton-nucleus interactions at 920 gevm using the hera-b detector."},"content":{"rendered":"<h2>Tesis doctoral de <strong> Ignacio Ari\u00f1o Ros <\/strong><\/h2>\n<p>En esta tesis se realiz\u00f3 en coordinaci\u00f3n con el centro alem\u00e1n desy (deusches electronen syncrotron) en hamburgo, en el marco de la colaboraci\u00f3n internacional para construir y explotar el detector hera-b.  hera b es un detector dise\u00f1ado para medir el fen\u00f3meno de la violaci\u00f3n de la simetr\u00eda cp en las desintegraciones de mesones neutros b. Para poder \u00abetiquetar\u00bb el tipo inicial de mes\u00f3n b es necesario disponer de una identificaci\u00f3n de las part\u00edculas resultantes de la desintegraci\u00f3n, que es proporcionada por el subdetector rich (ring imaging cerenkov).  en esta tesis se describe brevemente el detector hera-b y con un poco m\u00e1s de detalle el subdetector rich. En el rich part\u00edculas diferentes producen unos anillos de luz de diferente radio, que son medidos por una matriz de fotomultiplicadores. Para asignar un anillo a cada traza a pesar de la gran superposici\u00f3n de anillos, se desarroll\u00f3 un algoritmo para la identificaci\u00f3n de part\u00edculas basado en la utilizaci\u00f3n de toda la informaci\u00f3n disponible, como el centro de los anillos, sus radios esperados, etc. Y que asigna funciones de verosimilitud a las diferentes hip\u00f3tesis de masa de cada una de las trazas (electr\u00f3n, mu\u00f3n, pi\u00f3n, ka\u00f3n, y prot\u00f3n).  la informaci\u00f3n proporcionada por el algoritmo de identificaci\u00f3n de part\u00edculas fue aprovechada para evaluar las proporciones relativas de piones fijos. para ello otro algoritmo basado en funciones de verosimilitud fue desarrollado. adem\u00e1s, correcciones fueron aplicadas para corregir las malas identificaciones del algorirmo y la aceptancia del detector.  en esta tesis tambi\u00e9n se detallan los ajsutes necesarios para aplicar los algoritmos a datos reales, as\u00ed como las comparaciones entre las eficiencias de los algoritmos en datos reales y en la simulaci\u00f3n de monte-carlos.  seguidamente, se hace una evaluaci\u00f3n de los errores sistem\u00e1ticos atribuibles a diversos aspectos de la medida, como a los cortes en la selecci\u00f3n de los<\/p>\n<p>&nbsp;<\/p>\n<h3>Datos acad\u00e9micos de la tesis doctoral \u00ab<strong>Measurement of hadron fractions inproton-nucleus interactions at 920 gevm using the hera-b detector.<\/strong>\u00ab<\/h3>\n<ul>\n<li><strong>T\u00edtulo de la tesis:<\/strong>\u00a0 Measurement of hadron fractions inproton-nucleus interactions at 920 gevm using the hera-b detector. <\/li>\n<li><strong>Autor:<\/strong>\u00a0 Ignacio Ari\u00f1o Ros <\/li>\n<li><strong>Universidad:<\/strong>\u00a0 Barcelona<\/li>\n<li><strong>Fecha de lectura de la tesis:<\/strong>\u00a0 16\/05\/2001<\/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>Lu\u00eds Garrido Beltr\u00e1n<\/li>\n<\/ul>\n<\/li>\n<li><strong>Tribunal<\/strong>\n<ul>\n<li>Presidente del tribunal: bernardo Adeva andany <\/li>\n<li>peter Krizan (vocal)<\/li>\n<li>Juan  Antonio Fuster verdu (vocal)<\/li>\n<li>mokhtar Chmeissani (vocal)<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Tesis doctoral de Ignacio Ari\u00f1o Ros En esta tesis se realiz\u00f3 en coordinaci\u00f3n con el centro alem\u00e1n desy (deusches electronen [&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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