1<!DOCTYPE html> 2<!--[if IEMobile 7]><html class="iem7" lang="en" dir="ltr"><![endif]--> 3<!--[if lte IE 6]><html class="ie6 ie6-7 ie6-8" lang="en" dir="ltr"><![endif]--> 4<!--[if (IE 7)&(!IEMobile)]><html class="ie7 ie6-7 ie6-8" lang="en" dir="ltr"><![endif]--> 5<!--[if IE 8]><html class="ie8 ie6-8" lang="en" dir="ltr"><![endif]--> 6<!--[if (gte IE 9)|(gt IEMobile 7)]><!--> 7<html lang="en" dir="ltr" xmlns:content="http://purl.org/rss/1.0/modules/content/" xmlns:dc="http://purl.org/dc/terms/" xmlns:foaf="http://xmlns.com/foaf/0.1/" xmlns:og="http://ogp.me/ns#" xmlns:rdfs="http://www.w3.org/2000/01/rdf-schema#" xmlns:sioc="http://rdfs.org/sioc/ns#" xmlns:sioct="http://rdfs.org/sioc/types#" xmlns:skos="http://www.w3.org/2004/02/skos/core#" xmlns:xsd="http://www.w3.org/2001/XMLSchema#"><!--<![endif]--><head profile="http://www.w3.org/1999/xhtml/vocab"> 8<meta http-equiv="Content-Type" content="text/html; charset=utf-8"> 9<link rel="shortlink" href="http://home.web.cern.ch/node/186"> 10<link rel="shortcut icon" href="http://home.web.cern.ch/sites/home.web.cern.ch/themes/cern_public/favicon.ico" type="image/vnd.microsoft.icon"> 11<meta name="generator" content="Drupal 7 (http://drupal.org)"> 12<meta name="keywords" content="physics, CERN, Large Hadron Collider, LHC, high-energy physics, particles, science"> 13<meta content="Welcome" about="/welcome" property="dc:title"> 14<meta name="description" content="CERN, the European Organization for Nuclear Research, is one of the world’s largest and most respected centres for scientific research. Its business is fundamental physics, finding out what the Universe is made of and how it works."> 15<link rel="canonical" href="http://home.web.cern.ch/"> 16<title>CERN | Accelerating science</title> 17 18<meta name="MobileOptimized" content="width"> 19<meta name="HandheldFriendly" content="true"> 20<meta name="apple-mobile-web-app-capable" content="yes"> 21<meta http-equiv="cleartype" content="on"> 22<meta http-equiv="X-UA-Compatible" content="IE=edge,chrome=1"> 23 24<meta name="viewport" content="width=device-width, initial-scale=1.0, minimum-scale=1.0"> 25 26<!--[if (lt IE 9) & (!IEMobile)]> 27<script src="/sites/home.web.cern.ch/themes/cern_base/js/ie/html5-shiv.js"></script> 28<script src="/sites/home.web.cern.ch/themes/cern_base/js/ie/respond.min.js"></script> 29<![endif]--> 30 31<!-- Type from Google Fonts --> 32<!--<link href='//fonts.googleapis.com/css?family=PT+Sans:400,400italic,700' rel='stylesheet' type='text/css' /> --> 33 34<!-- Type from CERN Framework --> 35<!--<link href='//framework.web.cern.ch/framework/2.0/fonts/PTSansWeb/PTSansWeb.css' rel='stylesheet' type='text/css' /> --> 36 37<link type="text/css" rel="stylesheet" href="http://home.web.cern.ch/sites/home.web.cern.ch/files/css/css_AhZb9--zcjVTVeW6CZQcNekhgR8j6fbzyYP00FdaCRw.css" media="all"> 38<link type="text/css" rel="stylesheet" href="http://home.web.cern.ch/sites/home.web.cern.ch/files/css/css_j283sBGtH3houDrHGKllZ1v5S5LaM7HiIbwVnlfYv9M.css" media="all"> 39<link type="text/css" rel="stylesheet" href="http://home.web.cern.ch/sites/home.web.cern.ch/files/css/css_QKp2M4gs85_Nvdk6iuLKYkvukvYDwnmiEwVBnFkoYME.css" media="all"> 40<link type="text/css" rel="stylesheet" href="http://framework.web.cern.ch/framework/2.0/fonts/PTSansWeb/PTSansWeb.css" media="all"> 41<link type="text/css" rel="stylesheet" href="http://home.web.cern.ch/sites/home.web.cern.ch/files/css/css_SMGsWsGty_Sl5dmMxMHCnhpUk6m4iKH-GIs4zvK0oVY.css" media="all"> 42<link type="text/css" rel="stylesheet" href="http://home.web.cern.ch/sites/home.web.cern.ch/files/css/css_R8aK9V0plcl1hfAN1FtjU4Gwi1wZbCX9meu76GvRG_o.css" media="all"> 43<link type="text/css" rel="stylesheet" href="http://home.web.cern.ch/sites/home.web.cern.ch/files/css/css_e0Oi8I1L8cGJ7KxcUbimLkO-ivlPDoZXuBZMWKAz5GY.css" media="print"> 44 45<!--[if lt IE 8]> 46<link type="text/css" rel="stylesheet" href="http://home.web.cern.ch/sites/home.web.cern.ch/files/css/css_IJ5Z0j6pyxnr4TEmO0hiXWrh8FMpT6aq_hWn1LpRNOY.css" media="all" /> 47<![endif]--> 48<script type="text/javascript" src="http://home.web.cern.ch/sites/home.web.cern.ch/files/js/js_xAPl0qIk9eowy_iS9tNkCWXLUVoat94SQT48UBCFkyQ.js"></script> 49<script type="text/javascript" src="http://home.web.cern.ch/sites/home.web.cern.ch/files/js/js_ZcW7GPj-lBTdq14HzozaLfWfYQFXoVKaLwt0BJOAoQw.js"></script> 50<script type="text/javascript" src="http://home.web.cern.ch/sites/home.web.cern.ch/modules/lightbox2/js/lightbox.js?1390914833"></script> 51<script type="text/javascript" src="http://home.web.cern.ch/sites/home.web.cern.ch/files/js/js_cZDi_F4UdZLxEFq_9xe2G0f613pVJJfahpIjVjN_9As.js"></script> 52<script type="text/javascript"> 53<!--//--><![CDATA[//><!-- 54var _gaq = _gaq || [];_gaq.push(["_setAccount", "UA-8058079-23"]);_gaq.push(["_trackPageview"]);(function() {var ga = document.createElement("script");ga.type = "text/javascript";ga.async = true;ga.src = ("https:" == document.location.protocol ? "https://ssl" : "http://www") + ".google-analytics.com/ga.js";var s = document.getElementsByTagName("script")[0];s.parentNode.insertBefore(ga, s);})(); 55//--><!]]> 56</script> 57<script type="text/javascript" src="http://home.web.cern.ch/sites/home.web.cern.ch/files/js/js_nrCYFrKW7VxUxQnGsax9RA83dsVb6NFA182IhnN-hJE.js"></script> 58<script type="text/javascript" src="http://home.web.cern.ch/sites/home.web.cern.ch/files/js/js_qfFJI8oGg3K_MNw5jr_hcwHSHFX1ht-q2kS4ywl_egE.js"></script> 59<script type="text/javascript"> 60<!--//--><![CDATA[//><!-- 61jQuery.extend(Drupal.settings, {"basePath":"\/","pathPrefix":"","ajaxPageState":{"theme":"cern_public","theme_token":"kRe588a0DoyJn-MQjvhaZ2Jl2tI_E8bTNUbPRDLL6no","js":{"misc\/jquery.js":1,"misc\/jquery.once.js":1,"misc\/drupal.js":1,"sites\/all\/modules\/extlink\/extlink.js":1,"sites\/home.web.cern.ch\/modules\/lightbox2\/js\/lightbox.js":1,"sites\/home.web.cern.ch\/modules\/custom_search\/js\/custom_search.js":1,"sites\/home.web.cern.ch\/modules\/linkit\/editors\/ckeditor\/linkitDialog.js":1,"sites\/all\/modules\/google_analytics\/googleanalytics.js":1,"0":1,"sites\/home.web.cern.ch\/themes\/cern_base\/js\/ios-orientationchange-fix.js":1,"sites\/home.web.cern.ch\/themes\/cern_base\/js\/jquery.widowFix-1.3.2.min.js":1,"sites\/home.web.cern.ch\/themes\/cern_base\/js\/cern.js":1,"sites\/home.web.cern.ch\/themes\/cern_public\/js\/script.js":1,"sites\/home.web.cern.ch\/themes\/cern_public\/js\/cern.home.js":1},"css":{"modules\/system\/system.base.css":1,"modules\/system\/system.menus.css":1,"modules\/system\/system.messages.css":1,"modules\/system\/system.theme.css":1,"modules\/aggregator\/aggregator.css":1,"sites\/all\/modules\/cernsearchbox\/cernsearch.css":1,"sites\/home.web.cern.ch\/modules\/cern_toolbar\/css\/remove_ext.css":1,"sites\/all\/modules\/date\/date_api\/date.css":1,"sites\/all\/modules\/date\/date_popup\/themes\/datepicker.1.7.css":1,"modules\/field\/theme\/field.css":1,"modules\/node\/node.css":1,"modules\/search\/search.css":1,"modules\/user\/user.css":1,"sites\/all\/modules\/extlink\/extlink.css":1,"sites\/all\/modules\/views\/css\/views.css":1,"sites\/all\/modules\/shib_auth\/shib_auth.css":1,"sites\/all\/modules\/ckeditor\/ckeditor.css":1,"sites\/all\/modules\/ctools\/css\/ctools.css":1,"sites\/home.web.cern.ch\/modules\/lightbox2\/css\/lightbox.css":1,"modules\/locale\/locale.css":1,"sites\/home.web.cern.ch\/modules\/custom_search\/custom_search.css":1,"http:\/\/framework.web.cern.ch\/framework\/2.0\/fonts\/PTSansWeb\/PTSansWeb.css":1,"sites\/home.web.cern.ch\/modules\/cern_toolbar\/css\/screen.css":1,"sites\/home.web.cern.ch\/themes\/cern_base\/css\/disable\/system.menus.css":1,"sites\/home.web.cern.ch\/themes\/cern_base\/css\/disable\/system.messages.css":1,"sites\/home.web.cern.ch\/themes\/cern_base\/css\/disable\/advanced-forum.silver_bells.images.css":1,"sites\/home.web.cern.ch\/themes\/cern_base\/css\/disable\/advanced-forum.silver_bells.style.css":1,"sites\/home.web.cern.ch\/themes\/cern_base\/css\/base-styles.css":1,"sites\/home.web.cern.ch\/themes\/cern_public\/css\/styles.css":1,"sites\/home.web.cern.ch\/themes\/cern_public\/css\/print.css":1,"sites\/home.web.cern.ch\/modules\/cern_toolbar\/css\/ie.css":1}},"lightbox2":{"rtl":"0","file_path":"\/(\\w\\w\/)public:\/","default_image":"\/sites\/home.web.cern.ch\/modules\/lightbox2\/images\/brokenimage.jpg","border_size":10,"font_color":"000","box_color":"fff","top_position":"","overlay_opacity":"0.8","overlay_color":"000","disable_close_click":1,"resize_sequence":0,"resize_speed":400,"fade_in_speed":400,"slide_down_speed":600,"use_alt_layout":0,"disable_resize":0,"disable_zoom":1,"force_show_nav":0,"show_caption":1,"loop_items":0,"node_link_text":"View Image Details","node_link_target":0,"image_count":"Image !current of !total","video_count":"Video !current of !total","page_count":"Page !current of !total","lite_press_x_close":"press \u003Ca href=\u0022#\u0022 onclick=\u0022hideLightbox(); return FALSE;\u0022\u003E\u003Ckbd\u003Ex\u003C\/kbd\u003E\u003C\/a\u003E to close","download_link_text":"","enable_login":false,"enable_contact":false,"keys_close":"c x 27","keys_previous":"p 37","keys_next":"n 39","keys_zoom":"z","keys_play_pause":"32","display_image_size":"original","image_node_sizes":"()","trigger_lightbox_classes":"","trigger_lightbox_group_classes":"","trigger_slideshow_classes":"","trigger_lightframe_classes":"","trigger_lightframe_group_classes":"","custom_class_handler":0,"custom_trigger_classes":"","disable_for_gallery_lists":true,"disable_for_acidfree_gallery_lists":true,"enable_acidfree_videos":true,"slideshow_interval":5000,"slideshow_automatic_start":true,"slideshow_automatic_exit":true,"show_play_pause":true,"pause_on_next_click":false,"pause_on_previous_click":true,"loop_slides":false,"iframe_width":600,"iframe_height":400,"iframe_border":1,"enable_video":0},"custom_search":{"form_target":"_self","solr":0},"extlink":{"extTarget":0,"extClass":"ext","extSubdomains":1,"extExclude":"^Colllide@CERN$","extInclude":"","extCssExclude":"","extCssExplicit":"","extAlert":0,"extAlertText":"This link will take you to an external web site. We are not responsible for their content.","mailtoClass":"mailto"},"googleanalytics":{"trackOutbound":1,"trackMailto":1,"trackDownload":1,"trackDownloadExtensions":"7z|aac|arc|arj|asf|asx|avi|bin|csv|doc|exe|flv|gif|gz|gzip|hqx|jar|jpe?g|js|mp(2|3|4|e?g)|mov(ie)?|msi|msp|pdf|phps|png|ppt|qtm?|ra(m|r)?|sea|sit|tar|tgz|torrent|txt|wav|wma|wmv|wpd|xls|xml|z|zip"},"cern_public":{"language":"en","path":"sites\/home.web.cern.ch\/themes\/cern_public"}}); 62//--><!]]> 63</script> 64 65</head> 66 67<body id="page-homepage" class="section-homepage"> 68<div class="region region-page-top"> 69 70 71<div id="cern-toolbar" class="user-not-authenticated"> 72<h1><a href="http://cern.ch" title="CERN">CERN <span>Accelerating science</span></a></h1><ul><li class="cern-accountli"><a href="https://home.web.cern.ch/Shibboleth.sso/?target=https%3A%2F%2Fhome.web.cern.ch%2Fshib_login%2Fnode%2F186" title="Sign in to your CERN account" class="cern-account">Sign in</a></li><li><a href="http://cern.ch/directory" title="Search CERN resources and browse the directory" class="cern-directory">Directory</a></li></ul></div> 73</div><!-- /.region --> 74<!-- PAGE.TPL from CERN Public theme --> 75<div id="bg-img"> 76<header id="header" role="banner"> 77 78<h1 id="cern-logo"><a href="/" title="Home" rel="home">CERN</a></h1> 79 80 81<div id="header-content"> 82<div id="nav-bar"> 83<nav id="main-menu" role="navigation"> 84<h2 class="element-invisible">Main menu</h2><ul id="nav" class="menu"><li class="menu-461 first"><a href="/about">About CERN</a></li> 85<li class="menu-675"><a href="/students-educators">Students & Educators</a></li> 86<li class="menu-673"><a href="/scientists">Scientists</a></li> 87<li class="menu-674 last"><a href="/cern-people">CERN people</a></li> 88</ul> 89</nav> 90<div class="region region-lang-switch"> 91<div id="block-locale-language" class="block block-locale"> 92 93 94<ul class="language-switcher-locale-url"><li class="en first active"><a href="/" class="language-link active" lang="en">English</a></li> 95<li class="fr last"><a href="/fr" class="language-link" lang="fr">Français</a></li> 96</ul> 97</div> 98</div><!-- /.region --> 99</div> 100</div> 101 102 103</header> 104 105<div id="main" role="main"> 106 107<a id="main-content"></a> 108 109 110<!-- node.tpl from cern_public begins --> 111 112 113 114 115 116 117<!-- /node.tpl from cern_public ends --> 118 119<div class="update-area"> 120<section id="block-block-16" class="block block-block"> 121 122 123<h2>CERN Updates</h2> 124 125</section> 126<section id="block-views-4120d3b48fdd2fcc564776112836d0f0" class="block block-views block-updates-standard"> 127 128 129<div class="view view-Homepage-updates-blocks view-id-Homepage_updates_blocks view-display-id-block_updates_standard view-dom-id-b577b45bc19e257d448346ff1aee9451"> 130 131 132 133<div class="view-content"> 134<div class="item-list"> <ul> <li class="views-row views-row-1 views-row-odd views-row-first"><a href="/about/updates/2014/01/today-1971-first-proton-proton-collisions">Today in 1971: First proton-proton collisions</a><span class="field-content">27 January</span> 135</li> 136<li class="views-row views-row-2 views-row-even"><a href="http://www.symmetrymagazine.org/article/january-2014/fermilab-fills-in-for-cern-during-accelerator-shutdown" title="Visit external website">Labs work together toward higher-energy LHC</a><span class="field-content">27 January</span> 137</li> 138<li class="views-row views-row-3 views-row-odd"><a href="/about/updates/2014/01/antimatter-experiment-produces-first-beam-antihydrogen">Antimatter experiment produces first beam of antihydrogen</a><span class="field-content">21 January</span> 139</li> 140<li class="views-row views-row-4 views-row-even views-row-last"><a href="/about/updates/2014/01/fifty-years-quarks">Fifty years of quarks</a><span class="field-content">17 January</span> 141</li> 142</ul></div> </div> 143 144 145 146 147<div class="more-link"> 148<a href="/about/updates"> 149Past updates </a> 150</div> 151 152 153 154 155 156</div> 157</section> 158<section id="block-search-form" class="block block-search"> 159 160 161<form class="search-form" action="/" method="post" id="search-block-form" accept-charset="UTF-8"><div><div class="container-inline"> 162<h2 class="element-invisible">Search form</h2> 163<div class="form-item form-type-textfield form-item-search-block-form"> 164<label class="element-invisible" for="edit-search-block-form--2">Search this site </label> 165<input title="Enter the terms you wish to search for." class="custom-search-box form-text" placeholder="" onblur="if (this.value == '') {this.value = 'Search this site';}" onfocus="if (this.value == 'Search this site') {this.value = '';}" type="text" id="edit-search-block-form--2" name="search_block_form" value="Search this site" size="20" maxlength="128"> 166</div> 167<div class="form-actions form-wrapper" id="edit-actions"><input type="submit" id="edit-submit" name="op" value="Search" class="form-submit"></div><input type="hidden" name="form_build_id" value="form-gqiuzMzVXi6y43Ud4gdkV6uegThm9YQZ9-qqye47mbk"> 168<input type="hidden" name="form_id" value="search_block_form"> 169</div> 170</div></form> 171</section> 172</div> 173 174</div><!-- /#main --> 175 176 177</div><!-- /#bg-img --> 178 179<footer id="footer" role="contentinfo"> 180<div class="region region-footer-2"> 181<div id="block-menu-menu-global-footer-menu-2" class="block block-menu"> 182 183<h2>General info</h2> 184 185<ul class="menu"><li class="first leaf"><a href="http://cern.ch/jobs" title="">Jobs</a></li> 186<li class="leaf"><a href="http://cern.ch/outreach" title="">Visits</a></li> 187<li class="last leaf"><a href="http://cern.ch/press" title="">Press</a></li> 188</ul> 189</div> 190</div><!-- /.region --> 191<div class="region region-footer-3"> 192<div id="block-menu-menu-global-footer-menu-3" class="block block-menu"> 193 194<h2>CERN & you</h2> 195 196<ul class="menu"><li class="first leaf"><a href="http://cern.ch/procurement" title="">Doing business with CERN</a></li> 197<li class="leaf"><a href="http://cern.ch/knowledgetransfer" title="">Knowledge transfer</a></li> 198<li class="leaf"><a href="http://cern.ch/project-voisins/" title="">CERN's neighbours</a></li> 199<li class="last leaf"><a href="/partnerships" title="">Partnerships</a></li> 200</ul> 201</div> 202</div><!-- /.region --> 203<div class="region region-footer-5"> 204<div id="block-block-5" class="block block-block"> 205 206<h2>Contact</h2> 207 208<p>CERN<br> 209CH-1211 Geneva 23<br> 210Switzerland</p> 211<p><a href="/contact">How to reach us</a></p> 212 213</div> 214</div><!-- /.region --> 215<div class="region region-footer-4"> 216<div id="block-menu-menu-global-footer-menu-5" class="block block-menu"> 217 218<h2>Connect with CERN</h2> 219 220<ul class="menu"><li class="first leaf"><a href="http://facebook.com/cern" title="">Facebook</a></li> 221<li class="leaf"><a href="http://twitter.com/cern" title="">Twitter</a></li> 222<li class="leaf"><a href="http://plus.google.com/+CERN/" title="">Google+</a></li> 223<li class="leaf"><a href="http://youtube.com/cern" title="">YouTube</a></li> 224<li class="leaf"><a href="http://itunes.apple.com/institution/cern-european-organization/id390118692" title="">iTunes U</a></li> 225<li class="last leaf"><a href="/feeds" title="">Feeds</a></li> 226</ul> 227</div> 228</div><!-- /.region --> 229<div class="region region-footer-1"> 230<div id="block-block-4" class="block block-block"> 231 232 233<p><a href="http://cern.ch/copyright">© Copyright CERN 2014</a></p> 234 235 236<p><a href="http://cern.ch/cern60"><img alt="" src="/sites/home.web.cern.ch/files/u3/logo-60-negatif_a80.png" style="float:right"></a></p> 237</div> 238</div><!-- /.region --> 239</footer> 240 241<!--[if lte IE 8]><img id="bg" src="" /><![endif]--> 242 243 244<!--[if (lt IE 9) & (!IEMobile)]> 245<script src="/sites/home.web.cern.ch/themes/cern_base/js/ie/imgsizer.js"></script> 246<script src="/sites/home.web.cern.ch/themes/cern_base/js/ie/selectivizr-min.js"></script> 247<script src="/sites/home.web.cern.ch/themes/cern_base/js/ie/jquery-extra-selectors.js"></script> 248<![endif]--> 249 250<!-- Prompts all IE6 users to install Google Chromeframe --> 251<!--[if lt IE 7]> 252<script src="https://ajax.googleapis.com/ajax/libs/chrome-frame/1/CFInstall.min.js"></script> 253<script>CFInstall.check();</script> 254<![endif]--> 255 256<script src="https://get.gridsetapp.com/125/overlay/"></script> 257 258 259 260 261 262 263</body></html>
