How to create and set a separate template file for articles in Genesis framework? (WordPress)

You can use this…

<?php get_header(); ?>

<?php genesis_before_content_sidebar_wrap(); ?>
<div id="content-sidebar-wrap">

    <?php genesis_before_content(); ?>
    <div id="content" class="hfeed">

        <?php genesis_before_loop(); ?>
        <?php genesis_loop(); ?>
        <?php genesis_after_loop(); ?>

    </div><!-- end #content -->
    <?php genesis_after_content(); ?>

</div><!-- end #content-sidebar-wrap -->
<?php genesis_after_content_sidebar_wrap(); ?>

<?php get_footer(); ?>

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CHange this line:

<?php genesis_loop(); ?>

To whatever loop you need whether its single.php, category.php, page.php etc…

Best of luck,
Sagive