{"id":70786,"date":"2018-03-09T23:15:17","date_gmt":"2018-03-09T23:15:17","guid":{"rendered":"https:\/\/www.deberes.net\/tesis\/sin-categoria\/study-of-b-quark-mass-effects-in-multijet-topologies-with-the-delphi-detector-at-lep\/"},"modified":"2018-03-09T23:15:17","modified_gmt":"2018-03-09T23:15:17","slug":"study-of-b-quark-mass-effects-in-multijet-topologies-with-the-delphi-detector-at-lep","status":"publish","type":"post","link":"https:\/\/www.deberes.net\/tesis\/fisica\/study-of-b-quark-mass-effects-in-multijet-topologies-with-the-delphi-detector-at-lep\/","title":{"rendered":"Study of b-quark mass effects in multijet topologies with the delphi detector at lep"},"content":{"rendered":"<h2>Tesis doctoral de <strong> Pablo Tortosa Mart\u00ednez <\/strong><\/h2>\n<p>\u00ab\u00bbel efecto de masa del quark b en n-jet rates (n=2-4) se ha estudiado utilizando los datos registrados por el experimento delphi~a la energ\u00eda de producci\u00f3n del bos\u00f3n z entre los a\u00f1os 1994 y 1995. Se ha medido la secci\u00f3n eficaz normalizada de producci\u00f3n en sucesos originados por quarks b en topolog\u00edas de dos y tres jets respecto a sucesos originados por quarks ligeros (l=uds), r2bl y r4bl, utilizando el algoritmo de reconstrucci\u00f3n de jets cambridge.  los resultados se han comparado a nivel de hadrones con las predicciones de generadores de monte carlo y c\u00e1lculos lo masivos. Se ha investigado la validez de aproximar correcciones nlo masivas por las correspondientes correcciones para masa cero  y se ha encontrado que describen bien los resultados experimentales.Se ha obtenido la primera medida de la masa running del quark b a la energ\u00eda del bos\u00f3n z, mb(mz), procedente de un observable de cuatro jets, r4bl.  el resultado obtenido para la masa running del quark b es:  mb(mz) = 3.46 +\/- 0.35 (stat) +\/- 0.19 (syst) +\/- 0.24 (had) +\/- 0.43 (theo) gev\/c2  con un error total de 630 mev\/c2. Este resultado es compatible con otras determinaciones a la escala mz y con la evoluci\u00f3n con la escala de mb(q)tal y como predicen las ecuaciones del grupo de renormalizaci\u00f3n de qcd.  tambi\u00e9n se ha medido la masa polo del quark b, con un valor obtenido de:  m_b = 5.05 +\/- 0.45 (stat) +\/- 0.24 (syst) +\/- 0.32 (had) +\/- 0.55 (theo) gev\/c2  consistente con las medidas existentes y con el valor de la masa running traducido a masa polo.  los resultados experimentales y la teor\u00eda (c\u00e1lculos me o generadores de monte carlo) como pythia, herwigv y ariadne) se comparan despu\u00e9s de la fase de hadronizaci\u00f3n. Los datos son corregidos de efectos de la selecci\u00f3n cinem\u00e1tica y del detector, mientras que los c\u00e1lculos me a nivel de partones son corregidos por la hadronizaci\u00f3n y efectos de isr+fsr. El nivel de partones se define como el estado final de<\/p>\n<p>&nbsp;<\/p>\n<h3>Datos acad\u00e9micos de la tesis doctoral \u00ab<strong>Study of b-quark mass effects in multijet topologies with the delphi detector at lep<\/strong>\u00ab<\/h3>\n<ul>\n<li><strong>T\u00edtulo de la tesis:<\/strong>\u00a0 Study of b-quark mass effects in multijet topologies with the delphi detector at lep <\/li>\n<li><strong>Autor:<\/strong>\u00a0 Pablo Tortosa Mart\u00ednez <\/li>\n<li><strong>Universidad:<\/strong>\u00a0 Universitat de val\u00e9ncia (estudi general)<\/li>\n<li><strong>Fecha de lectura de la tesis:<\/strong>\u00a0 15\/10\/2004<\/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>Juan  Antonio Fuster Verdu<\/li>\n<\/ul>\n<\/li>\n<li><strong>Tribunal<\/strong>\n<ul>\n<li>Presidente del tribunal: carmen Garc\u00eda Garc\u00eda <\/li>\n<li>Luis Labarga echeverr\u00eda (vocal)<\/li>\n<li>llu\u00eds Garrido beltr\u00e1n (vocal)<\/li>\n<li>michael Seymour (vocal)<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Tesis doctoral de Pablo Tortosa Mart\u00ednez \u00ab\u00bbel efecto de masa del quark b en n-jet rates (n=2-4) se ha estudiado [&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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