<?xml version="1.0" encoding="ISO-8859-1"?><article xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
<front>
<journal-meta>
<journal-id>0035-001X</journal-id>
<journal-title><![CDATA[Revista mexicana de física]]></journal-title>
<abbrev-journal-title><![CDATA[Rev. mex. fis.]]></abbrev-journal-title>
<issn>0035-001X</issn>
<publisher>
<publisher-name><![CDATA[Sociedad Mexicana de Física]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S0035-001X2008000100007</article-id>
<title-group>
<article-title xml:lang="en"><![CDATA[Deviations from the universality of slepton masses in the MSSM]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Gómez-Bock]]></surname>
<given-names><![CDATA[M]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
</contrib-group>
<aff id="A01">
<institution><![CDATA[,Universidad Autónoma de Puebla Instituto de Física ]]></institution>
<addr-line><![CDATA[Puebla Pue]]></addr-line>
<country>México</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>02</month>
<year>2008</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>02</month>
<year>2008</year>
</pub-date>
<volume>54</volume>
<numero>1</numero>
<fpage>30</fpage>
<lpage>34</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S0035-001X2008000100007&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S0035-001X2008000100007&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S0035-001X2008000100007&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="en"><p><![CDATA[In this paper we propose an ansatz that applies to the slepton mass matrices. In our approach, these matrices contain a dominant sector that can be diagonalized exactly. We study the numerical results for the slepton mass eigenstates, looking for deviations from universality, which is usually assumed when one evaluates the production of sleptons at future colliders.]]></p></abstract>
<abstract abstract-type="short" xml:lang="es"><p><![CDATA[En este artículo proponemos un ansatz para la matriz de masa de fermiones-s aplicandolo a los leptones-s. Dentro de esta aproximación las matrices contienen un sector dominante, el cual es diagonalizable exactamente. Se hace un análisis numérico de los resultados para los eigenestados de masa de los leptones-s, buscando las desviaciones de la universalidad de las masas, dicha consideración sobre las masas es utilizada generalmente al evaluar la producción de leptones-s en los futuros colisionadores.]]></p></abstract>
<kwd-group>
<kwd lng="en"><![CDATA[S-leptons]]></kwd>
<kwd lng="en"><![CDATA[universality]]></kwd>
<kwd lng="en"><![CDATA[flavor]]></kwd>
<kwd lng="en"><![CDATA[MSSM]]></kwd>
<kwd lng="es"><![CDATA[Leptones-s]]></kwd>
<kwd lng="es"><![CDATA[universalidad]]></kwd>
<kwd lng="es"><![CDATA[sabor]]></kwd>
<kwd lng="es"><![CDATA[modelo estándar mínimo supersimétrico]]></kwd>
</kwd-group>
</article-meta>
</front><body><![CDATA[ <p align="justify"><font face="verdana" size="4">Investigaci&oacute;n</font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="center"><font face="verdana" size="4"><b>Deviations from the universality of slepton masses in the MSSM</b></font></p>     <p align="center"><font face="verdana" size="2">&nbsp;</font></p>     <p align="center"><font face="verdana" size="2"><b>M. G&oacute;mez&#150;Bock</b></font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="justify"><font face="verdana" size="2"><i>Instituto de F&iacute;sica, Benem&eacute;rita Universidad Aut&oacute;noma de Puebla, Apartado Postal J&#150;48 Puebla, Pue. M&eacute;xico.</i></font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="justify"><font face="verdana" size="2">Recibido el 6 de septiembre de 2007    <br>   Aceptado el 23 de octubre de 2007</font></p>     ]]></body>
<body><![CDATA[<p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="justify"><font face="verdana" size="2"><b>Abstract</b></font></p>     <p align="justify"><font face="verdana" size="2">In this paper we propose an ansatz that applies to the slepton mass matrices. In our approach, these matrices contain a dominant sector that can be diagonalized exactly. We study the numerical results for the slepton mass eigenstates, looking for deviations from universality, which is usually assumed when one evaluates the production of sleptons at future colliders.</font></p>     <p align="justify"><font face="verdana" size="2"><b>Keywords: </b>S&#150;leptons; universality; flavor; MSSM.</font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="justify"><font face="verdana" size="2"><b>Resumen</b></font></p>     <p align="justify"><font face="verdana" size="2">En este art&iacute;culo proponemos un ansatz para la matriz de masa de fermiones&#150;s aplicandolo a los leptones&#150;s. Dentro de esta aproximaci&oacute;n las matrices contienen un sector dominante, el cual es diagonalizable exactamente. Se hace un an&aacute;lisis num&eacute;rico de los resultados para los eigenestados de masa de los leptones&#150;s, buscando las desviaciones de la universalidad de las masas, dicha consideraci&oacute;n sobre las masas es utilizada generalmente al evaluar la producci&oacute;n de leptones&#150;s en los futuros colisionadores.</font></p>     <p align="justify"><font face="verdana" size="2"><b>Descriptores: </b>Leptones&#150;s; universalidad; sabor; modelo est&aacute;ndar m&iacute;nimo supersim&eacute;trico</font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="justify"><font face="verdana" size="2">PACS: 14.80.Ly; 11.30.Hv; 12.60. Jv</font></p>     ]]></body>
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